MHA 一主两从搭建-脚本VIP-自动切换

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环境介绍:
主机名  IP            MHA角色  mysql角色
canal1  10.30.13.51   Node     MySQL Master
canal2  10.30.13.52   Node     MySQL Master behind
canal3  10.30.13.53   Node     MySQL slave
node3   10.30.13.107  Manager  None

所有主机 /etc/hosts 添加信息
10.30.13.107  node3
10.30.13.51 canal1
10.30.13.52 canal2
10.30.13.53 canal3

关闭selinux
永久生效:
/etc/selinux/config 文件修改如下参数
SELINUX=disabled

临时生效:
setenforce 0


关闭防火墙
chkconfig iptables off
chkconfig ip6tables off

/etc/init.d/iptables stop


安装MySQL:

解压软件
mkdir /opt/mysql
mv mysql-5.6.34-linux-glibc2.5-x86_64.tar.gz /opt/mysql
cd /opt/mysql
tar -zxvf mysql-5.6.34-linux-glibc2.5-x86_64.tar.gz

创建软连接
ln -s /opt/mysql/mysql-5.6.34-linux-glibc2.5-x86_64 /usr/local/mysql

创建运行用户
groupadd mysql
useradd -g mysql -d /usr/local/mysql -s /sbin/nologin -M -n mysql

创建所需的目录
mkdir -p /data/mysql/3307/{data,logs,tmp}
chown -R mysql:mysql /data/mysql/3307/
chown -R mysql:mysql /usr/local/mysql

配置文件内容
#my.cnf
[client]
port = 3307
socket = /data/mysql/3307/tmp/3307.sock

[mysql]
#pager="less -i -n -S"
#tee=/opt/mysql/query.log
no-auto-rehash

[mysqld]
#misc
user = mysql
basedir = /usr/local/mysql
datadir = /data/mysql/3307/data
port = 3307
socket = /data/mysql/3307/tmp/3307.sock
event_scheduler = 0

tmpdir = /data/mysql/3307/tmp
#timeout
interactive_timeout = 300
wait_timeout = 300

#character set
character-set-server = utf8

open_files_limit = 65535
max_connections = 100
max_connect_errors = 100000
lower_case_table_names =1

#symi replication

#rpl_semi_sync_master_enabled=1
#rpl_semi_sync_master_timeout=1000 # 1 second
#rpl_semi_sync_slave_enabled=1

#logs
log-output=file
slow_query_log = 1
slow_query_log_file = slow.log
log-error = error.log
log_warnings = 2
pid-file = mysql.pid
long_query_time = 1
#log-slow-admin-statements = 1
#log-queries-not-using-indexes = 1
log-slow-slave-statements = 1

#binlog
#binlog_format = STATEMENT
binlog_format = row
server-id = 330728
log-bin = /data/mysql/3307/logs/mysql-bin
binlog_cache_size = 4M
max_binlog_size = 256M
max_binlog_cache_size = 1M
sync_binlog = 0
expire_logs_days = 10
#procedure
log_bin_trust_function_creators=1

#
#gtid-mode = on
#enforce-gtid-consistency=1


#relay log
skip_slave_start = 1
max_relay_log_size = 128M
relay_log_purge = 1
relay_log_recovery = 1
relay-log=relay-bin
relay-log-index=relay-bin.index
log_slave_updates
#slave-skip-errors=1032,1053,1062
#skip-grant-tables

#buffers & cache
table_open_cache = 2048
table_definition_cache = 2048
table_open_cache = 2048
max_heap_table_size = 96M
sort_buffer_size = 128K
join_buffer_size = 128K
thread_cache_size = 200
query_cache_size = 0
query_cache_type = 0
query_cache_limit = 256K
query_cache_min_res_unit = 512
thread_stack = 192K
tmp_table_size = 96M
key_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 16M
bulk_insert_buffer_size = 32M

#myisam
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1

#innodb
innodb_buffer_pool_size = 100M
innodb_buffer_pool_instances = 1
innodb_data_file_path = ibdata1:100M:autoextend
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 8M
innodb_log_file_size = 100M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 50
innodb_file_per_table = 1
innodb_rollback_on_timeout
innodb_status_file = 1
innodb_io_capacity = 100
transaction_isolation = READ-COMMITTED
innodb_flush_method = O_DIRECT

修改my3307.cnf权限
chown mysql:mysql /etc/my.cnf

初始化数据库
/usr/local/mysql/scripts/mysql_install_db --defaults-file=/etc/my.cnf --basedir=/usr/local/mysql --datadir=/data/mysql/3307/data --user=mysql

设置环境变量
echo "export PATH=$PATH:/usr/local/mysql/bin">> /etc/profile
source /etc/profile

cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld

启动MySQL
/etc/init.d/mysqld start

账号处理
grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘chengce243‘ with grant option;
delete from mysql.user where password =‘‘;
flush privileges;

搭建从库
主库创建复制账号
create user ‘repl‘@‘10.30.13.%‘ identified by ‘chengce243‘;
grant replication slave on *.* to ‘repl‘@‘10.30.13.%‘;
flush privileges;

两个从库分别执行如下语句
MASTER_LOG_FILE 和 MASTER_LOG_POS 值,从主库 show master status;查看

CHANGE MASTER TO MASTER_HOST=‘10.30.13.51‘,MASTER_USER=‘repl‘,MASTER_PASSWORD=‘chengce243‘,MASTER_PORT=3307,MASTER_LOG_FILE=‘mysql-bin.000003‘,MASTER_LOG_POS=2676;

两个从库分别开启复制
start slave;

主库上创建
create user ‘mhauser‘@‘10.30.13.%‘ identified by ‘chengce243‘;
grant all privileges on *.* to ‘mhauser‘@‘10.30.13.%‘;
flush privileges;


配置root用户互信

在 node3 节点生成互信文件,输入如下命令,一路回车就行
ssh-keygen

cd ~/.ssh

cat id_rsa.pub > authorized_keys
chmod 600 *
cd ~/
scp -r .ssh 10.30.13.51:~/
scp -r .ssh 10.30.13.52:~/
scp -r .ssh 10.30.13.53:~/

最后每个节点都要验证
ssh node3 date
ssh canal1 date
ssh canal2 date
ssh canal3 date


每个节点都要安装相关依赖包
yum install -y perl-devel
yum install -y perl-CPAN
yum install -y perl-Time-HiRes
yum install -y perl-DBD-MySQL
yum install -y perl-Params-Validate

yum install -y perl-Config-Tiny
yum install -y perl-Log-Dispatch
yum install -y perl-Parallel-ForkManager

MHA master节点,即 node3 安装
rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm
rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm


MHA node节点,即 canal1/canal2/canal3安装
rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm


为MHA的相关配置信息的存放规划目录结构(四台服务器均要操作):
mkdir -p /masterha_work/{conf,manager_workdir,rmt_mysql_binlog_workdir,script_dir,log}

自定义规则:
conf,存放MHA的配置文件
log,存放于MHA有关的日志信息
script_dir,除了默认的存放脚本的位置外,另一个存放自定义的或者官方提供的脚本的位置
manager_workdir,Manager的工作目录
rmt_mysql_binlog_workdir,当发生切换的时候,MySQL的binlog的临时存放路径


修改配置目录权限:
chown -R mysql:mysql /masterha_work

[[email protected] conf]# cat /masterha_work/conf/mha_total.cnf

[server default]
manager_workdir=/masterha_work/manager_workdir
manager_log=/masterha_work/log/manager.log

master_binlog_dir=/data/mysql/3307/logs
user=mhauser
password=chengce243

#master_ip_failover_script=/usr/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=canal1 --orig_master_ip=10.30.13.51 --orig_master_port=3307
master_ip_online_change_script=/usr/bin/master_ip_online_change

ping_interval=1

remote_workdir=/masterha_work/rmt_mysql_binlog_workdir

repl_user=repl
repl_password=chengce243
port=3307

report_script=/usr/bin/send_report

secondary_check_script=/usr/local/bin/masterha_secondary_check -s canal2 -s canal1 --user=mhame --master_host=canal2 --master_ip=10.30.13.52 --master_port=3307
shutdown_script=""

ssh_user=root

[server1]
hostname=10.30.13.51
port=3307

[server2]
hostname=10.30.13.52
candidate_master=1
check_repl_delay=0
port=3307

[server3]
hostname=10.30.13.53
port=3307
no_master=1


测试SSH连通性:

[[email protected] ~]# masterha_check_ssh --conf=/masterha_work/conf/mha_total.cnf
Tue Oct 31 15:12:21 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Tue Oct 31 15:12:21 2017 - [info] Reading application default configuration from /masterha_work/conf/mha_total.cnf..
Tue Oct 31 15:12:21 2017 - [info] Reading server configuration from /masterha_work/conf/mha_total.cnf..
Tue Oct 31 15:12:21 2017 - [info] Starting SSH connection tests..
Tue Oct 31 15:12:22 2017 - [debug]
Tue Oct 31 15:12:21 2017 - [debug]  Connecting via SSH from [email protected](10.30.13.51:22) to [email protected](10.30.13.52:22)..
Tue Oct 31 15:12:21 2017 - [debug]   ok.
Tue Oct 31 15:12:21 2017 - [debug]  Connecting via SSH from [email protected](10.30.13.51:22) to [email protected](10.30.13.53:22)..
Tue Oct 31 15:12:22 2017 - [debug]   ok.
Tue Oct 31 15:12:22 2017 - [debug]
Tue Oct 31 15:12:22 2017 - [debug]  Connecting via SSH from [email protected](10.30.13.52:22) to [email protected](10.30.13.51:22)..
Tue Oct 31 15:12:22 2017 - [debug]   ok.
Tue Oct 31 15:12:22 2017 - [debug]  Connecting via SSH from [email protected](10.30.13.52:22) to [email protected](10.30.13.53:22)..
Tue Oct 31 15:12:22 2017 - [debug]   ok.
Tue Oct 31 15:12:23 2017 - [debug]
Tue Oct 31 15:12:22 2017 - [debug]  Connecting via SSH from [email protected](10.30.13.53:22) to [email protected](10.30.13.51:22)..
Tue Oct 31 15:12:22 2017 - [debug]   ok.
Tue Oct 31 15:12:22 2017 - [debug]  Connecting via SSH from [email protected](10.30.13.53:22) to [email protected](10.30.13.52:22)..
Tue Oct 31 15:12:23 2017 - [debug]   ok.
Tue Oct 31 15:12:23 2017 - [info] All SSH connection tests passed successfully.


测试MySQL复制的情况:

[[email protected] ~]# masterha_check_repl --conf=/masterha_work/conf/mha_total.cnf
Tue Oct 31 15:17:09 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Tue Oct 31 15:17:09 2017 - [info] Reading application default configuration from /masterha_work/conf/mha_total.cnf..
Tue Oct 31 15:17:09 2017 - [info] Reading server configuration from /masterha_work/conf/mha_total.cnf..
Tue Oct 31 15:17:09 2017 - [info] MHA::MasterMonitor version 0.56.
Tue Oct 31 15:17:09 2017 - [info] GTID failover mode = 0
Tue Oct 31 15:17:09 2017 - [info] Dead Servers:
Tue Oct 31 15:17:09 2017 - [info] Alive Servers:
Tue Oct 31 15:17:09 2017 - [info]   10.30.13.51(10.30.13.51:3307)
Tue Oct 31 15:17:09 2017 - [info]   10.30.13.52(10.30.13.52:3307)
Tue Oct 31 15:17:09 2017 - [info]   10.30.13.53(10.30.13.53:3307)
Tue Oct 31 15:17:09 2017 - [info] Alive Slaves:
Tue Oct 31 15:17:09 2017 - [info]   10.30.13.52(10.30.13.52:3307)  Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Tue Oct 31 15:17:09 2017 - [info]     Replicating from 10.30.13.51(10.30.13.51:3307)
Tue Oct 31 15:17:09 2017 - [info]     Primary candidate for the new Master (candidate_master is set)
Tue Oct 31 15:17:09 2017 - [info]   10.30.13.53(10.30.13.53:3307)  Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Tue Oct 31 15:17:09 2017 - [info]     Replicating from 10.30.13.51(10.30.13.51:3307)
Tue Oct 31 15:17:09 2017 - [info]     Not candidate for the new Master (no_master is set)
Tue Oct 31 15:17:09 2017 - [info] Current Alive Master: 10.30.13.51(10.30.13.51:3307)
Tue Oct 31 15:17:09 2017 - [info] Checking slave configurations..
Tue Oct 31 15:17:09 2017 - [info]  read_only=1 is not set on slave 10.30.13.52(10.30.13.52:3307).
Tue Oct 31 15:17:09 2017 - [warning]  relay_log_purge=0 is not set on slave 10.30.13.52(10.30.13.52:3307).
Tue Oct 31 15:17:09 2017 - [info]  read_only=1 is not set on slave 10.30.13.53(10.30.13.53:3307).
Tue Oct 31 15:17:09 2017 - [warning]  relay_log_purge=0 is not set on slave 10.30.13.53(10.30.13.53:3307).
Tue Oct 31 15:17:09 2017 - [info] Checking replication filtering settings..
Tue Oct 31 15:17:09 2017 - [info]  binlog_do_db= , binlog_ignore_db=
Tue Oct 31 15:17:09 2017 - [info]  Replication filtering check ok.
Tue Oct 31 15:17:09 2017 - [info] GTID (with auto-pos) is not supported
Tue Oct 31 15:17:09 2017 - [info] Starting SSH connection tests..
Tue Oct 31 15:17:10 2017 - [info] All SSH connection tests passed successfully.
Tue Oct 31 15:17:10 2017 - [info] Checking MHA Node version..
Tue Oct 31 15:17:10 2017 - [info]  Version check ok.
Tue Oct 31 15:17:10 2017 - [info] Checking SSH publickey authentication settings on the current master..
Tue Oct 31 15:17:11 2017 - [info] HealthCheck: SSH to 10.30.13.51 is reachable.
Tue Oct 31 15:17:11 2017 - [info] Master MHA Node version is 0.56.
Tue Oct 31 15:17:11 2017 - [info] Checking recovery script configurations on 10.30.13.51(10.30.13.51:3307)..
Tue Oct 31 15:17:11 2017 - [info]   Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysql/3307/logs --output_file=/masterha_work/rmt_mysql_binlog_workdir/save_binary_logs_test --manager_version=0.56 --start_file=mysql-bin.000003
Tue Oct 31 15:17:11 2017 - [info]   Connecting to [email protected](10.30.13.51:22)..
  Creating /masterha_work/rmt_mysql_binlog_workdir if not exists..    ok.
  Checking output directory is accessible or not..
   ok.
  Binlog found at /data/mysql/3307/logs, up to mysql-bin.000003
Tue Oct 31 15:17:11 2017 - [info] Binlog setting check done.
Tue Oct 31 15:17:11 2017 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Tue Oct 31 15:17:11 2017 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user=‘mhauser‘ --slave_host=10.30.13.52 --slave_ip=10.30.13.52 --slave_port=3307 --workdir=/masterha_work/rmt_mysql_binlog_workdir --target_version=5.6.34-log --manager_version=0.56 --relay_log_info=/data/mysql/3307/data/relay-log.info  --relay_dir=/data/mysql/3307/data/  --slave_pass=xxx
Tue Oct 31 15:17:11 2017 - [info]   Connecting to [email protected](10.30.13.52:22)..
  Checking slave recovery environment settings..
    Opening /data/mysql/3307/data/relay-log.info ... ok.
    Relay log found at /data/mysql/3307/data, up to relay-bin.000002
    Temporary relay log file is /data/mysql/3307/data/relay-bin.000002
    Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
 done.
    Testing mysqlbinlog output.. done.
    Cleaning up test file(s).. done.
Tue Oct 31 15:17:11 2017 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user=‘mhauser‘ --slave_host=10.30.13.53 --slave_ip=10.30.13.53 --slave_port=3307 --workdir=/masterha_work/rmt_mysql_binlog_workdir --target_version=5.6.34-log --manager_version=0.56 --relay_log_info=/data/mysql/3307/data/relay-log.info  --relay_dir=/data/mysql/3307/data/  --slave_pass=xxx
Tue Oct 31 15:17:11 2017 - [info]   Connecting to [email protected](10.30.13.53:22)..
  Checking slave recovery environment settings..
    Opening /data/mysql/3307/data/relay-log.info ... ok.
    Relay log found at /data/mysql/3307/data, up to relay-bin.000002
    Temporary relay log file is /data/mysql/3307/data/relay-bin.000002
    Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
 done.
    Testing mysqlbinlog output.. done.
    Cleaning up test file(s).. done.
Tue Oct 31 15:17:11 2017 - [info] Slaves settings check done.
Tue Oct 31 15:17:11 2017 - [info]
10.30.13.51(10.30.13.51:3307) (current master)
 +--10.30.13.52(10.30.13.52:3307)
 +--10.30.13.53(10.30.13.53:3307)

Tue Oct 31 15:17:11 2017 - [info] Checking replication health on 10.30.13.52..
Tue Oct 31 15:17:11 2017 - [info]  ok.
Tue Oct 31 15:17:11 2017 - [info] Checking replication health on 10.30.13.53..
Tue Oct 31 15:17:11 2017 - [info]  ok.
Tue Oct 31 15:17:11 2017 - [warning] master_ip_failover_script is not defined.
Tue Oct 31 15:17:11 2017 - [warning] shutdown_script is not defined.
Tue Oct 31 15:17:11 2017 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.



配置VIP

str_vip="10.30.13.19"
str_mask="255.255.255.0"
str_nic_name="eth0:0"

ifconfig $str_nic_name $str_vip netmask $str_mask up
ifconfig $str_nic_name $str_vip netmask $str_mask down


master_ip_failover脚本修改

注释掉 FIXME,

原:
## Creating an app user on the new master
print "Creating app user on the new master..\n";
FIXME_xxx_create_user( $new_master_handler->{dbh} );
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
FIXME_xxx;

修改如下:

## Creating an app user on the new master
print "Creating app user on the new master..\n";
#FIXME_xxx_create_user( $new_master_handler->{dbh} );
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();
## Update master ip on the catalog database, etc
#FIXME_xxx;

在 FIXME_xxx 后面增加对do_vip_crontab.sh 脚本的调用:

 `/usr/bin/ssh -t root\@${orig_master_ip} "sh /data/script/do_vip_crontab.sh 1 0"`;
 `/usr/bin/ssh -t root\@${new_master_ip} "sh /data/script/do_vip_crontab.sh 0 1"`;
 `sh /script/shell/do_mha.sh > /work_dir/mha_manager/test_me/do_mha.log`;

注意,一定要用【;】结尾,否则脚本执行会出错。


修改 new_master_handler 中 mhamhauser用户与密码 :

# args: hostname, port, user, password, raise_error_or_not
#$new_master_handler->connect( $new_master_ip, $new_master_port,
# $new_master_user, $new_master_password, 1 );
$new_master_handler->connect( $new_master_ip, $new_master_port,
‘mhauser‘, ‘chengce243‘, 1 );



修改后 master_ip_failover 脚本如下:

[[email protected] ~]# cat /usr/bin/master_ip_failover
#!/usr/bin/env perl
 
#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
## Note: This is a sample script and is not complete. Modify the script based on your environment.
 
use strict;
use warnings FATAL => ‘all‘;
 
use Getopt::Long;
use MHA::DBHelper;
 
my (
  $command,        $ssh_user,         $orig_master_host,
  $orig_master_ip, $orig_master_port, $new_master_host,
  $new_master_ip,  $new_master_port,  $new_master_user,
  $new_master_password
);
GetOptions(
  ‘command=s‘             => \$command,
  ‘ssh_user=s‘            => \$ssh_user,
  ‘orig_master_host=s‘    => \$orig_master_host,
  ‘orig_master_ip=s‘      => \$orig_master_ip,
  ‘orig_master_port=i‘    => \$orig_master_port,
  ‘new_master_host=s‘     => \$new_master_host,
  ‘new_master_ip=s‘       => \$new_master_ip,
  ‘new_master_port=i‘     => \$new_master_port,
  ‘new_master_user=s‘     => \$new_master_user,
  ‘new_master_password=s‘ => \$new_master_password,
);
 
exit &main();
 
sub main {
  if ( $command eq "stop" || $command eq "stopssh" ) {
 
    # $orig_master_host, $orig_master_ip, $orig_master_port are passed.
    # If you manage master ip address at global catalog database,
    # invalidate orig_master_ip here.
    my $exit_code = 1;
    eval {
 
      # updating global catalog, etc
      $exit_code = 0;
    };
    if ([email protected]) {
      warn "Got Error: [email protected]\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "start" ) {
 
    # all arguments are passed.
    # If you manage master ip address at global catalog database,
    # activate new_master_ip here.
    # You can also grant write access (create user, set read_only=0, etc) here.
    my $exit_code = 10;
    eval {
      my $new_master_handler = new MHA::DBHelper();
 
      # args: hostname, port, user, password, raise_error_or_not
      $new_master_handler->connect( $new_master_ip, $new_master_port,
        "mhauser", "chengce243", 1 );
 
      ## Set read_only=0 on the new master
      $new_master_handler->disable_log_bin_local();
      print "Set read_only=0 on the new master.\n";
      $new_master_handler->disable_read_only();
 
      ## Creating an app user on the new master
      print "Creating app user on the new master..\n";
      #FIXME_xxx_create_user( $new_master_handler->{dbh} );
      $new_master_handler->enable_log_bin_local();
      $new_master_handler->disconnect();
 
      ## Update master ip on the catalog database, etc
      #FIXME_xxx;
 
      `echo "script begin running..." > /work_dir/mha_manager/test_me/master_ip_failover_run_shell`;
      
      #`/usr/bin/ssh -t root\@${orig_master_ip} "service keepalived stop" > /work_dir/mha_manager/test_me/orig_master.log`;
      #`/usr/bin/ssh -t root\@${new_master_ip} "service keepalived start" > /work_dir/mha_manager/test_me/new_master.log`;
       `/usr/bin/ssh -t root\@${orig_master_ip} "sh /data/script/do_vip_crontab.sh 1 0"`;
       `/usr/bin/ssh -t root\@${new_master_ip} "sh /data/script/do_vip_crontab.sh 0 1"`;
      `sh /script/shell/do_mha.sh > /work_dir/mha_manager/test_me/do_mha.log`;
 
      $exit_code = 0;
    };
    if ([email protected]) {
      warn [email protected];
 
      # If you want to continue failover, exit 10.
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "status" ) {
 
    # do nothing
    exit 0;
  }
  else {
    &usage();
    exit 1;
  }
}
 
sub usage {
  print
"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
}




最后修改脚本权限:
chmod 755 /usr/bin/master_ip_failover


master_ip_online_change 脚本修改:

注释 FIXME_xxx_drop_app_user
原来:
## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
$orig_master_handler->disable_log_bin_local();
print current_time_us() . " Drpping app user on the orig master..\n";
FIXME_xxx_drop_app_user($orig_master_handler);

修改如下:
## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
$orig_master_handler->disable_log_bin_local();
print current_time_us() . " Drpping app user on the orig master..\n";
#FIXME_xxx_drop_app_user($orig_master_handler);

注释 FIXME_xxx_create_app_user
原来:
## Creating an app user on the new master
print current_time_us() . " Creating app user on the new master..\n";
FIXME_xxx_create_app_user($new_master_handler);
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();

修改如下:
## Creating an app user on the new master
print current_time_us() . " Creating app user on the new master..\n";
#FIXME_xxx_create_app_user($new_master_handler);
$new_master_handler->enable_log_bin_local();
$new_master_handler->disconnect();

修改 mhauser 用户的位置:
位置一:
# args: hostname, port, user, password, raise_error(die_on_error)_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
  "mhauser", "chengce243", 1 );

位置二:
# args: hostname, port, user, password, raise_error_or_not
$new_master_handler->connect( $new_master_ip, $new_master_port,
  "mhauser", "chengce243", 1 );

增加do_vip_crontab.sh 脚本的调用:
 `/usr/bin/ssh -t root\@${orig_master_ip} "sh /data/script/do_vip_crontab.sh 1 0"`;
 `/usr/bin/ssh -t root\@${new_master_ip} "sh /data/script/do_vip_crontab.sh 0 1"`;

 
修改后的脚本如下:
[[email protected] ~]# cat /usr/bin/master_ip_online_change
#!/usr/bin/env perl
 
#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
## Note: This is a sample script and is not complete. Modify the script based on your environment.
 
use strict;
use warnings FATAL => ‘all‘;
 
use Getopt::Long;
use MHA::DBHelper;
use MHA::NodeUtil;
use Time::HiRes qw( sleep gettimeofday tv_interval );
use Data::Dumper;
 
my $_tstart;
my $_running_interval = 0.1;
my (
  $command,              $orig_master_is_new_slave, $orig_master_host,
  $orig_master_ip,       $orig_master_port,         $orig_master_user,
  $orig_master_password, $orig_master_ssh_user,     $new_master_host,
  $new_master_ip,        $new_master_port,          $new_master_user,
  $new_master_password,  $new_master_ssh_user,
);
GetOptions(
  ‘command=s‘                => \$command,
  ‘orig_master_is_new_slave‘ => \$orig_master_is_new_slave,
  ‘orig_master_host=s‘       => \$orig_master_host,
  ‘orig_master_ip=s‘         => \$orig_master_ip,
  ‘orig_master_port=i‘       => \$orig_master_port,
  ‘orig_master_user=s‘       => \$orig_master_user,
  ‘orig_master_password=s‘   => \$orig_master_password,
  ‘orig_master_ssh_user=s‘   => \$orig_master_ssh_user,
  ‘new_master_host=s‘        => \$new_master_host,
  ‘new_master_ip=s‘          => \$new_master_ip,
  ‘new_master_port=i‘        => \$new_master_port,
  ‘new_master_user=s‘        => \$new_master_user,
  ‘new_master_password=s‘    => \$new_master_password,
  ‘new_master_ssh_user=s‘    => \$new_master_ssh_user,
);
 
exit &main();
 
sub current_time_us {
  my ( $sec, $microsec ) = gettimeofday();
  my $curdate = localtime($sec);
  return $curdate . " " . sprintf( "%06d", $microsec );
}
 
sub sleep_until {
  my $elapsed = tv_interval($_tstart);
  if ( $_running_interval > $elapsed ) {
    sleep( $_running_interval - $elapsed );
  }
}
 
sub get_threads_util {
  my $dbh                    = shift;
  my $my_connection_id       = shift;
  my $running_time_threshold = shift;
  my $type                   = shift;
  $running_time_threshold = 0 unless ($running_time_threshold);
  $type                   = 0 unless ($type);
  my @threads;
 
  my $sth = $dbh->prepare("SHOW PROCESSLIST");
  $sth->execute();
 
  while ( my $ref = $sth->fetchrow_hashref() ) {
    my $id         = $ref->{Id};
    my $user       = $ref->{User};
    my $host       = $ref->{Host};
    my $command    = $ref->{Command};
    my $state      = $ref->{State};
    my $query_time = $ref->{Time};
    my $info       = $ref->{Info};
    $info =~ s/^\s*(.*?)\s*$/$1/ if defined($info);
    next if ( $my_connection_id == $id );
    next if ( defined($query_time) && $query_time < $running_time_threshold );
    next if ( defined($command)    && $command eq "Binlog Dump" );
    next if ( defined($user)       && $user eq "system user" );
    next
      if ( defined($command)
      && $command eq "Sleep"
      && defined($query_time)
      && $query_time >= 1 );
 
    if ( $type >= 1 ) {
      next if ( defined($command) && $command eq "Sleep" );
      next if ( defined($command) && $command eq "Connect" );
    }
 
    if ( $type >= 2 ) {
      next if ( defined($info) && $info =~ m/^select/i );
      next if ( defined($info) && $info =~ m/^show/i );
    }
 
    push @threads, $ref;
  }
  return @threads;
}
 
sub main {
  if ( $command eq "stop" ) {
    ## Gracefully killing connections on the current master
    # 1. Set read_only= 1 on the new master
    # 2. DROP USER so that no app user can establish new connections
    # 3. Set read_only= 1 on the current master
    # 4. Kill current queries
    # * Any database access failure will result in script die.
    my $exit_code = 1;
    eval {
      ## Setting read_only=1 on the new master (to avoid accident)
      my $new_master_handler = new MHA::DBHelper();
 
      # args: hostname, port, user, password, raise_error(die_on_error)_or_not
      $new_master_handler->connect( $new_master_ip, $new_master_port,
        "mhauser", "chengce243", 1 );
      print current_time_us() . " Set read_only on the new master.. ";
      $new_master_handler->enable_read_only();
      if ( $new_master_handler->is_read_only() ) {
        print "ok.\n";
      }
      else {
        die "Failed!\n";
      }
      $new_master_handler->disconnect();
 
      # Connecting to the orig master, die if any database error happens
      my $orig_master_handler = new MHA::DBHelper();
      $orig_master_handler->connect( $orig_master_ip, $orig_master_port,
        $orig_master_user, $orig_master_password, 1 );
 
      ## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
      $orig_master_handler->disable_log_bin_local();
      print current_time_us() . " Drpping app user on the orig master..\n";
      #FIXME_xxx_drop_app_user($orig_master_handler);
 
      ## Waiting for N * 100 milliseconds so that current connections can exit
      my $time_until_read_only = 15;
      $_tstart = [gettimeofday];
      my @threads = get_threads_util( $orig_master_handler->{dbh},
        $orig_master_handler->{connection_id} );
      while ( $time_until_read_only > 0 && $#threads >= 0 ) {
        if ( $time_until_read_only % 5 == 0 ) {
          printf
"%s Waiting all running %d threads are disconnected.. (max %d milliseconds)\n",
            current_time_us(), $#threads + 1, $time_until_read_only * 100;
          if ( $#threads < 5 ) {
            print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
              foreach (@threads);
          }
        }
        sleep_until();
        $_tstart = [gettimeofday];
        $time_until_read_only--;
        @threads = get_threads_util( $orig_master_handler->{dbh},
          $orig_master_handler->{connection_id} );
      }
 
      ## Setting read_only=1 on the current master so that nobody(except SUPER) can write
      print current_time_us() . " Set read_only=1 on the orig master.. ";
      $orig_master_handler->enable_read_only();
      if ( $orig_master_handler->is_read_only() ) {
        print "ok.\n";
      }
      else {
        die "Failed!\n";
      }
 
      ## Waiting for M * 100 milliseconds so that current update queries can complete
      my $time_until_kill_threads = 5;
      @threads = get_threads_util( $orig_master_handler->{dbh},
        $orig_master_handler->{connection_id} );
      while ( $time_until_kill_threads > 0 && $#threads >= 0 ) {
        if ( $time_until_kill_threads % 5 == 0 ) {
          printf
"%s Waiting all running %d queries are disconnected.. (max %d milliseconds)\n",
            current_time_us(), $#threads + 1, $time_until_kill_threads * 100;
          if ( $#threads < 5 ) {
            print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
              foreach (@threads);
          }
        }
        sleep_until();
        $_tstart = [gettimeofday];
        $time_until_kill_threads--;
        @threads = get_threads_util( $orig_master_handler->{dbh},
          $orig_master_handler->{connection_id} );
      }
 
      ## Terminating all threads
      print current_time_us() . " Killing all application threads..\n";
      $orig_master_handler->kill_threads(@threads) if ( $#threads >= 0 );
      print current_time_us() . " done.\n";
      $orig_master_handler->enable_log_bin_local();
      $orig_master_handler->disconnect();
 
      ## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK
      $exit_code = 0;
    };
    if ([email protected]) {
      warn "Got Error: [email protected]\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "start" ) {
    ## Activating master ip on the new master
    # 1. Create app user with write privileges
    # 2. Moving backup script if needed
    # 3. Register new master‘s ip to the catalog database
 
# We don‘t return error even though activating updatable accounts/ip failed so that we don‘t interrupt slaves‘ recovery.
# If exit code is 0 or 10, MHA does not abort
    my $exit_code = 10;
    eval {
      my $new_master_handler = new MHA::DBHelper();
 
      # args: hostname, port, user, password, raise_error_or_not
      $new_master_handler->connect( $new_master_ip, $new_master_port,
        "mhauser", "chengce243", 1 );
 
      ## Set read_only=0 on the new master
      $new_master_handler->disable_log_bin_local();
      print current_time_us() . " Set read_only=0 on the new master.\n";
      $new_master_handler->disable_read_only();
 
      ## Creating an app user on the new master
      print current_time_us() . " Creating app user on the new master..\n";
      #FIXME_xxx_create_app_user($new_master_handler);
      $new_master_handler->enable_log_bin_local();
      $new_master_handler->disconnect();
 
      ## Update master ip on the catalog database, etc
      #`/usr/bin/ssh -t root\@${orig_master_ip} "service keepalived stop"`;
      #`/usr/bin/ssh -t root\@${new_master_ip} "service keepalived start"`;
       `/usr/bin/ssh -t root\@${orig_master_ip} "sh /data/script/do_vip_crontab.sh 1 0"`;
       `/usr/bin/ssh -t root\@${new_master_ip} "sh /data/script/do_vip_crontab.sh 0 1"`;

      $exit_code = 0;
    };
    if ([email protected]) {
      warn "Got Error: [email protected]\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "status" ) {
 
    # do nothing
    exit 0;
  }
  else {
    &usage();
    exit 1;
  }
}
 
sub usage {
  print
"Usage: master_ip_online_change --command=start|stop|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
  die;
}



修改文件的权限:
chmod 755 /usr/bin/master_ip_online_change


MHA配置文件中打开对FAILOVER脚本的引用

[[email protected] ~]# cat /masterha_work/conf/mha_total.cnf

[server default]
manager_workdir=/masterha_work/manager_workdir
manager_log=/masterha_work/log/manager.log

master_binlog_dir=/data/mysql/3307/logs
user=mhauser
password=chengce243

master_ip_failover_script=/usr/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=canal1 --orig_master_ip=10.30.13.51 --orig_master_port=3307
master_ip_online_change_script=/usr/bin/master_ip_online_change

ping_interval=1

remote_workdir=/masterha_work/rmt_mysql_binlog_workdir

repl_user=repl
repl_password=chengce243
port=3307

report_script=/usr/bin/send_report

secondary_check_script=/usr/local/bin/masterha_secondary_check -s canal2 -s canal1 --user=mhame --master_host=canal2 --master_ip=10.30.13.52 --master_port=3307
shutdown_script=""

ssh_user=root

[server1]
hostname=10.30.13.51
port=3307

[server2]
hostname=10.30.13.52
candidate_master=1
check_repl_delay=0
port=3307

[server3]
hostname=10.30.13.53
port=3307
no_master=1



测试一下:

[[email protected] ~]# masterha_check_repl --conf=/masterha_work/conf/mha_total.cnf
Tue Oct 31 16:43:47 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Tue Oct 31 16:43:47 2017 - [info] Reading application default configuration from /masterha_work/conf/mha_total.cnf..
Tue Oct 31 16:43:47 2017 - [info] Reading server configuration from /masterha_work/conf/mha_total.cnf..
Tue Oct 31 16:43:47 2017 - [info] MHA::MasterMonitor version 0.56.
Tue Oct 31 16:43:47 2017 - [info] GTID failover mode = 0
Tue Oct 31 16:43:47 2017 - [info] Dead Servers:
Tue Oct 31 16:43:47 2017 - [info] Alive Servers:
Tue Oct 31 16:43:47 2017 - [info]   10.30.13.51(10.30.13.51:3307)
Tue Oct 31 16:43:47 2017 - [info]   10.30.13.52(10.30.13.52:3307)
Tue Oct 31 16:43:47 2017 - [info]   10.30.13.53(10.30.13.53:3307)
Tue Oct 31 16:43:47 2017 - [info] Alive Slaves:
Tue Oct 31 16:43:47 2017 - [info]   10.30.13.52(10.30.13.52:3307)  Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Tue Oct 31 16:43:47 2017 - [info]     Replicating from 10.30.13.51(10.30.13.51:3307)
Tue Oct 31 16:43:47 2017 - [info]     Primary candidate for the new Master (candidate_master is set)
Tue Oct 31 16:43:47 2017 - [info]   10.30.13.53(10.30.13.53:3307)  Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Tue Oct 31 16:43:47 2017 - [info]     Replicating from 10.30.13.51(10.30.13.51:3307)
Tue Oct 31 16:43:47 2017 - [info]     Not candidate for the new Master (no_master is set)
Tue Oct 31 16:43:47 2017 - [info] Current Alive Master: 10.30.13.51(10.30.13.51:3307)
Tue Oct 31 16:43:47 2017 - [info] Checking slave configurations..
Tue Oct 31 16:43:47 2017 - [info]  read_only=1 is not set on slave 10.30.13.52(10.30.13.52:3307).
Tue Oct 31 16:43:47 2017 - [warning]  relay_log_purge=0 is not set on slave 10.30.13.52(10.30.13.52:3307).
Tue Oct 31 16:43:47 2017 - [info]  read_only=1 is not set on slave 10.30.13.53(10.30.13.53:3307).
Tue Oct 31 16:43:47 2017 - [warning]  relay_log_purge=0 is not set on slave 10.30.13.53(10.30.13.53:3307).
Tue Oct 31 16:43:47 2017 - [info] Checking replication filtering settings..
Tue Oct 31 16:43:47 2017 - [info]  binlog_do_db= , binlog_ignore_db=
Tue Oct 31 16:43:47 2017 - [info]  Replication filtering check ok.
Tue Oct 31 16:43:47 2017 - [info] GTID (with auto-pos) is not supported
Tue Oct 31 16:43:47 2017 - [info] Starting SSH connection tests..
Tue Oct 31 16:43:49 2017 - [info] All SSH connection tests passed successfully.
Tue Oct 31 16:43:49 2017 - [info] Checking MHA Node version..
Tue Oct 31 16:43:49 2017 - [info]  Version check ok.
Tue Oct 31 16:43:49 2017 - [info] Checking SSH publickey authentication settings on the current master..
Tue Oct 31 16:43:49 2017 - [info] HealthCheck: SSH to 10.30.13.51 is reachable.
Tue Oct 31 16:43:49 2017 - [info] Master MHA Node version is 0.56.
Tue Oct 31 16:43:49 2017 - [info] Checking recovery script configurations on 10.30.13.51(10.30.13.51:3307)..
Tue Oct 31 16:43:49 2017 - [info]   Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/data/mysql/3307/logs --output_file=/masterha_work/rmt_mysql_binlog_workdir/save_binary_logs_test --manager_version=0.56 --start_file=mysql-bin.000003
Tue Oct 31 16:43:49 2017 - [info]   Connecting to [email protected](10.30.13.51:22)..
  Creating /masterha_work/rmt_mysql_binlog_workdir if not exists..    ok.
  Checking output directory is accessible or not..
   ok.
  Binlog found at /data/mysql/3307/logs, up to mysql-bin.000003
Tue Oct 31 16:43:49 2017 - [info] Binlog setting check done.
Tue Oct 31 16:43:49 2017 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Tue Oct 31 16:43:49 2017 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user=‘mhauser‘ --slave_host=10.30.13.52 --slave_ip=10.30.13.52 --slave_port=3307 --workdir=/masterha_work/rmt_mysql_binlog_workdir --target_version=5.6.34-log --manager_version=0.56 --relay_log_info=/data/mysql/3307/data/relay-log.info  --relay_dir=/data/mysql/3307/data/  --slave_pass=xxx
Tue Oct 31 16:43:49 2017 - [info]   Connecting to [email protected](10.30.13.52:22)..
  Checking slave recovery environment settings..
    Opening /data/mysql/3307/data/relay-log.info ... ok.
    Relay log found at /data/mysql/3307/data, up to relay-bin.000002
    Temporary relay log file is /data/mysql/3307/data/relay-bin.000002
    Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
 done.
    Testing mysqlbinlog output.. done.
    Cleaning up test file(s).. done.
Tue Oct 31 16:43:50 2017 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user=‘mhauser‘ --slave_host=10.30.13.53 --slave_ip=10.30.13.53 --slave_port=3307 --workdir=/masterha_work/rmt_mysql_binlog_workdir --target_version=5.6.34-log --manager_version=0.56 --relay_log_info=/data/mysql/3307/data/relay-log.info  --relay_dir=/data/mysql/3307/data/  --slave_pass=xxx
Tue Oct 31 16:43:50 2017 - [info]   Connecting to [email protected](10.30.13.53:22)..
  Checking slave recovery environment settings..
    Opening /data/mysql/3307/data/relay-log.info ... ok.
    Relay log found at /data/mysql/3307/data, up to relay-bin.000002
    Temporary relay log file is /data/mysql/3307/data/relay-bin.000002
    Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
 done.
    Testing mysqlbinlog output.. done.
    Cleaning up test file(s).. done.
Tue Oct 31 16:43:50 2017 - [info] Slaves settings check done.
Tue Oct 31 16:43:50 2017 - [info]
10.30.13.51(10.30.13.51:3307) (current master)
 +--10.30.13.52(10.30.13.52:3307)
 +--10.30.13.53(10.30.13.53:3307)

Tue Oct 31 16:43:50 2017 - [info] Checking replication health on 10.30.13.52..
Tue Oct 31 16:43:50 2017 - [info]  ok.
Tue Oct 31 16:43:50 2017 - [info] Checking replication health on 10.30.13.53..
Tue Oct 31 16:43:50 2017 - [info]  ok.
Tue Oct 31 16:43:50 2017 - [info] Checking master_ip_failover_script status:
Tue Oct 31 16:43:50 2017 - [info]   /usr/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=canal1 --orig_master_ip=10.30.13.51 --orig_master_port=3307 --command=status --ssh_user=root --orig_master_host=10.30.13.51 --orig_master_ip=10.30.13.51 --orig_master_port=3307
Tue Oct 31 16:43:50 2017 - [info]  OK.
Tue Oct 31 16:43:50 2017 - [warning] shutdown_script is not defined.
Tue Oct 31 16:43:50 2017 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.


手动执行在线切换:

node1的IP:
[[email protected] ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:68:5f:50 brd ff:ff:ff:ff:ff:ff
inet 192.168.56.26/24 brd 192.168.56.255 scope global eth0
inet 192.168.56.206/24 scope global secondary eth0
inet6 fe80::a00:27ff:fe68:5f50/64 scope link
valid_lft forever preferred_lft forever

node3的从库状态:
[[email protected] ~]# mysql -uroot -pchengce243 -P3307
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 21
Server version: 5.6.34-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.26
Master_User: repl
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 2759
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 1324
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 2759
Relay_Log_Space: 1491
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 330726
Master_UUID: 336d78f5-a9d1-11e7-ab8a-080027685f50
Master_Info_File: /data/mysql/3307/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)


执行切换命令:
首先应该停止MHA:
[[email protected] ~]# masterha_stop --conf=/masterha_work/conf/mha_total.cnf


[[email protected] ~]# masterha_master_switch --master_state=alive --conf=/masterha_work/conf/mha_total.cnf
Fri Oct 6 16:09:39 2017 - [info] MHA::MasterRotate version 0.56.
Fri Oct 6 16:09:39 2017 - [info] Starting online master switch..
Fri Oct 6 16:09:39 2017 - [info]
Fri Oct 6 16:09:39 2017 - [info] * Phase 1: Configuration Check Phase..
Fri Oct 6 16:09:39 2017 - [info]
Fri Oct 6 16:09:39 2017 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Fri Oct 6 16:09:39 2017 - [info] Reading application default configuration from /masterha_work/conf/mha_total.cnf..
Fri Oct 6 16:09:39 2017 - [info] Reading server configuration from /masterha_work/conf/mha_total.cnf..
Fri Oct 6 16:09:39 2017 - [info] GTID failover mode = 0
Fri Oct 6 16:09:39 2017 - [info] Current Alive Master: 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 16:09:39 2017 - [info] Alive Slaves:
Fri Oct 6 16:09:39 2017 - [info] 192.168.56.27(192.168.56.27:3307) Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Fri Oct 6 16:09:39 2017 - [info] Replicating from 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 16:09:39 2017 - [info] Primary candidate for the new Master (candidate_master is set)
Fri Oct 6 16:09:39 2017 - [info] 192.168.56.28(192.168.56.28:3307) Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Fri Oct 6 16:09:39 2017 - [info] Replicating from 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 16:09:39 2017 - [info] Not candidate for the new Master (no_master is set)

It is better to execute FLUSH NO_WRITE_TO_BINLOG TABLES on the master before switching. Is it ok to execute on 192.168.56.26(192.168.56.26:3307)? (YES/no): yes
Fri Oct 6 16:10:08 2017 - [info] Executing FLUSH NO_WRITE_TO_BINLOG TABLES. This may take long time..
Fri Oct 6 16:10:08 2017 - [info] ok.
Fri Oct 6 16:10:08 2017 - [info] Checking MHA is not monitoring or doing failover..
Fri Oct 6 16:10:09 2017 - [info] Checking replication health on 192.168.56.27..
Fri Oct 6 16:10:09 2017 - [info] ok.
Fri Oct 6 16:10:09 2017 - [info] Checking replication health on 192.168.56.28..
Fri Oct 6 16:10:09 2017 - [info] ok.
Fri Oct 6 16:10:09 2017 - [info] Searching new master from slaves..
Fri Oct 6 16:10:09 2017 - [info] Candidate masters from the configuration file:
Fri Oct 6 16:10:09 2017 - [info] 192.168.56.27(192.168.56.27:3307) Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Fri Oct 6 16:10:09 2017 - [info] Replicating from 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 16:10:09 2017 - [info] Primary candidate for the new Master (candidate_master is set)
Fri Oct 6 16:10:09 2017 - [info] Non-candidate masters:
Fri Oct 6 16:10:09 2017 - [info] 192.168.56.28(192.168.56.28:3307) Version=5.6.34-log (oldest major version between slaves) log-bin:enabled
Fri Oct 6 16:10:09 2017 - [info] Replicating from 192.168.56.26(192.168.56.26:3307)
Fri Oct 6 16:10:09 2017 - [info] Not candidate for the new Master (no_master is set)
Fri Oct 6 16:10:09 2017 - [info] Searching from candidate_master slaves which have received the latest relay log events..
Fri Oct 6 16:10:09 2017 - [info]
From:
192.168.56.26(192.168.56.26:3307) (current master)
+--192.168.56.27(192.168.56.27:3307)
+--192.168.56.28(192.168.56.28:3307)

To:
192.168.56.27(192.168.56.27:3307) (new master)
+--192.168.56.28(192.168.56.28:3307)

Starting master switch from 192.168.56.26(192.168.56.26:3307) to 192.168.56.27(192.168.56.27:3307)? (yes/NO): yes
Fri Oct 6 16:10:10 2017 - [info] Checking whether 192.168.56.27(192.168.56.27:3307) is ok for the new master..
Fri Oct 6 16:10:10 2017 - [info] ok.
Fri Oct 6 16:10:10 2017 - [info] ** Phase 1: Configuration Check Phase completed.
Fri Oct 6 16:10:10 2017 - [info]
Fri Oct 6 16:10:10 2017 - [info] * Phase 2: Rejecting updates Phase..
Fri Oct 6 16:10:10 2017 - [info]
Fri Oct 6 16:10:10 2017 - [info] Executing master ip online change script to disable write on the current master:
Fri Oct 6 16:10:10 2017 - [info] /usr/bin/master_ip_online_change --command=stop --orig_master_host=192.168.56.26 --orig_master_ip=192.168.56.26 --orig_master_port=3307 --orig_master_user=‘mhauser‘ --orig_master_password=‘chengce243‘ --new_master_host=192.168.56.27 --new_master_ip=192.168.56.27 --new_master_port=3307 --new_master_user=‘mhauser‘ --new_master_password=‘chengce243‘ --orig_master_ssh_user=root --new_master_ssh_user=root
Fri Oct 6 16:10:10 2017 856828 Set read_only on the new master.. ok.
Fri Oct 6 16:10:10 2017 898583 Drpping app user on the orig master..
Fri Oct 6 16:10:10 2017 900126 Set read_only=1 on the orig master.. ok.
Fri Oct 6 16:10:10 2017 923958 Killing all application threads..
Fri Oct 6 16:10:10 2017 924002 done.
Fri Oct 6 16:10:10 2017 - [info] ok.
Fri Oct 6 16:10:10 2017 - [info] Locking all tables on the orig master to reject updates from everybody (including root):
Fri Oct 6 16:10:10 2017 - [info] Executing FLUSH TABLES WITH READ LOCK..
Fri Oct 6 16:10:10 2017 - [info] ok.
Fri Oct 6 16:10:10 2017 - [info] Orig master binlog:pos is mysql-bin.000003:2759.
Fri Oct 6 16:10:10 2017 - [info] Waiting to execute all relay logs on 192.168.56.27(192.168.56.27:3307)..
Fri Oct 6 16:10:10 2017 - [info] master_pos_wait(mysql-bin.000003:2759) completed on 192.168.56.27(192.168.56.27:3307). Executed 0 events.
Fri Oct 6 16:10:10 2017 - [info] done.
Fri Oct 6 16:10:11 2017 - [info] Getting new master‘s binlog name and position..
Fri Oct 6 16:10:11 2017 - [info] mysql-bin.000003:2743
Fri Oct 6 16:10:11 2017 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST=‘192.168.56.27‘, MASTER_PORT=3307, MASTER_LOG_FILE=‘mysql-bin.000003‘, MASTER_LOG_POS=2743, MASTER_USER=‘repl‘, MASTER_PASSWORD=‘xxx‘;
Fri Oct 6 16:10:11 2017 - [info] Executing master ip online change script to allow write on the new master:
Fri Oct 6 16:10:11 2017 - [info] /usr/bin/master_ip_online_change --command=start --orig_master_host=192.168.56.26 --orig_master_ip=192.168.56.26 --orig_master_port=3307 --orig_master_user=‘mhauser‘ --orig_master_password=‘chengce243‘ --new_master_host=192.168.56.27 --new_master_ip=192.168.56.27 --new_master_port=3307 --new_master_user=‘mhauser‘ --new_master_password=‘chengce243‘ --orig_master_ssh_user=root --new_master_ssh_user=root
Fri Oct 6 16:10:11 2017 117572 Set read_only=0 on the new master.
Fri Oct 6 16:10:11 2017 121387 Creating app user on the new master..
Connection to 192.168.56.26 closed.
Fri Oct 6 16:10:11 2017 - [info] ok.
Fri Oct 6 16:10:11 2017 - [info]
Fri Oct 6 16:10:11 2017 - [info] * Switching slaves in parallel..
Fri Oct 6 16:10:11 2017 - [info]
Fri Oct 6 16:10:11 2017 - [info] -- Slave switch on host 192.168.56.28(192.168.56.28:3307) started, pid: 1871
Fri Oct 6 16:10:11 2017 - [info]
Fri Oct 6 16:10:11 2017 - [info] Log messages from 192.168.56.28 ...
Fri Oct 6 16:10:11 2017 - [info]
Fri Oct 6 16:10:11 2017 - [info] Waiting to execute all relay logs on 192.168.56.28(192.168.56.28:3307)..
Fri Oct 6 16:10:11 2017 - [info] master_pos_wait(mysql-bin.000003:2759) completed on 192.168.56.28(192.168.56.28:3307). Executed 0 events.
Fri Oct 6 16:10:11 2017 - [info] done.
Fri Oct 6 16:10:11 2017 - [info] Resetting slave 192.168.56.28(192.168.56.28:3307) and starting replication from the new master 192.168.56.27(192.168.56.27:3307)..
Fri Oct 6 16:10:11 2017 - [info] Executed CHANGE MASTER.
Fri Oct 6 16:10:11 2017 - [info] Slave started.
Fri Oct 6 16:10:11 2017 - [info] End of log messages from 192.168.56.28 ...
Fri Oct 6 16:10:11 2017 - [info]
Fri Oct 6 16:10:11 2017 - [info] -- Slave switch on host 192.168.56.28(192.168.56.28:3307) succeeded.
Fri Oct 6 16:10:11 2017 - [info] Unlocking all tables on the orig master:
Fri Oct 6 16:10:11 2017 - [info] Executing UNLOCK TABLES..
Fri Oct 6 16:10:11 2017 - [info] ok.
Fri Oct 6 16:10:11 2017 - [info] All new slave servers switched successfully.
Fri Oct 6 16:10:11 2017 - [info]
Fri Oct 6 16:10:11 2017 - [info] * Phase 5: New master cleanup phase..
Fri Oct 6 16:10:11 2017 - [info]
Fri Oct 6 16:10:12 2017 - [info] 192.168.56.27: Resetting slave info succeeded.
Fri Oct 6 16:10:12 2017 - [info] Switching master to 192.168.56.27(192.168.56.27:3307) completed successfully.

node1的IP:
[[email protected] ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:68:5f:50 brd ff:ff:ff:ff:ff:ff
inet 192.168.56.26/24 brd 192.168.56.255 scope global eth0
inet6 fe80::a00:27ff:fe68:5f50/64 scope link
valid_lft forever preferred_lft forever


node1的状态:
mysql> show master status ;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 | 2759 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

mysql> show slave status \G
Empty set (0.00 sec)

可以看到node1现在已经不是从库了。原master可能已经废弃掉了。

node2的IP:
[[email protected] ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:7c:8a:78 brd ff:ff:ff:ff:ff:ff
inet 192.168.56.27/24 brd 192.168.56.255 scope global eth0
inet 192.168.56.206/24 scope global secondary eth0
inet6 fe80::a00:27ff:fe7c:8a78/64 scope link
valid_lft forever preferred_lft forever

node3的从库状态:
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.27
Master_User: repl
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 2743
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 2743
Relay_Log_Space: 450
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 330727
Master_UUID: 8a12a46e-a9e0-11e7-abee-0800277c8a78
Master_Info_File: /data/mysql/3307/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)

可以看到现在主库已经是node2了。
自此,切换成功。

根据上面输出的日志,找出如下内容,然后在node1上执行。
CHANGE MASTER TO MASTER_HOST=‘192.168.56.27‘, MASTER_PORT=3307, MASTER_LOG_FILE=‘mysql-bin.000003‘, MASTER_LOG_POS=2743, MASTER_USER=‘repl‘, MASTER_PASSWORD=‘chengce243‘;

mysql> start slave ;
Query OK, 0 rows affected (0.06 sec)


mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.27
Master_User: repl
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 2743
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 2743
Relay_Log_Space: 450
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 330727
Master_UUID: 8a12a46e-a9e0-11e7-abee-0800277c8a78
Master_Info_File: /data/mysql/3307/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)

自此,node1已经是node2的从库


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