Mysql集群高可用架构(MHA)

Posted 青衫解衣

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Linux系统版本:

[root@master ~]# cat /etc/redhat-release

CentOS Linux release 7.4.1708 (Core)

mysql数据版本:

 mysql-5.7.31-1.el7.x86_64.rpm-bundle.tar

角色分配:

Master   10.40.42.103  (mha master)

Slave1   10.40.42.105  (mha node1)

Slave2  10.40.42.127  (mha node2)

安装mysql:

 yum localinstall mysql-community-* -y

​配置一主多从:

master主库/etc/my.cn的配置:​

[root@master ~]# grep -v "^#" /etc/my.cnf

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

symbolic-links=0

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

server-id=1   # 服务ID

log_bin=/var/lib/mysql/mysql-bin  # 指定二进制日志路径

binlog_format=ROW   # 以行的方式保存二进制日志

skip-name-resolve  # 不将IP地址解析成名字

relay_log=relay-log  # 开启中继日志

Node1的/etc/my.cn配置:

[root@node1 ~]#  grep -v "^#" /etc/my.cnf         

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

symbolic-links=0

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

 

server-id=2

read-only

log_bin=/var/lib/mysql/mysql-bin

binlog_format=row

skip-name-resolve

relay_log_purge=0   # 默认是清除中继日志，选择不清除

relay_log=relay-log  # 开启中继日志

Node2的/etc/my.cn配置:

[root@node2 ~]#  grep -v "^#" /etc/my.cnf         

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

symbolic-links=0

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

 

server-id=3

read-only

skip-name-resolve

relay_log_purge=0 # 不清除中继日志

log_bin=/var/lib/mysql/mysql-bin

binlog_format=row

relay_log=relay-log #开启中继日志

master创建主从复制用户权限:

mysql> grant replication  slave  on *.* to rep@\'10.40.42.%\' identified by \'1qaz@WSX\';     Query OK, 0 rows affected, 1 warning (0.11 sec)

 

mysql> flush privileges;

Query OK, 0 rows affected (0.07 sec)

 

Node1启动主从复制:

mysql> CHANGE MASTER TO MASTER_HOST=\'10.40.42.103\',MASTER_USER=\'rep\',MASTER_PASSWORD=\'1qaz@WSX\',MASTER_PORT=3306,MASTER_LOG_FILE=\'mysql-bin.000001\',MASTER_LOG_POS=597;

Query OK, 0 rows affected, 2 warnings (0.24 sec)

mysql> start slave;

Query OK, 0 rows affected (0.02 sec)

 

​Node2启动主从复制:

​mysql> CHANGE MASTER TO MASTER_HOST=\'10.40.42.103\',MASTER_USER=\'rep\',MASTER_PASSWORD=\'1qaz@WSX\',MASTER_PORT=3306,MASTER_LOG_FILE=\'mysql-bin.000001\',MASTER_LOG_POS=597;

Query OK, 0 rows affected, 2 warnings (0.59 sec)

 

mysql> start slave;

Query OK, 0 rows affected (0.01 sec)

 

查看node1和node2的主从状态:

 Slave_IO_Running: Yes

 Slave_SQL_Running: Yes

master节点再创建一个super权限的用户:

登录三台数据库服务器，创建mhauser账号并授权，也可以直接使用root账户或其他有权限的已有用户

需要的权限：Super,select,create,insert,update,delete,drop,reload

 

这个账号主要提供给mah管理监控主从和自动选举等操作使用。

mysql> grant all privileges on *.* to \'mhauser\'@\'%\' identified by \'1qaz@WSX\';

Query OK, 0 rows affected, 1 warning (0.03 sec)

 

mysql> flush privileges;

Query OK, 0 rows affected (0.02 sec)

​MHA的安装:

下载mha软件:​

mha的安装依赖epel-release源,先安装epel-release源。

wget ​​https://github.com/yoshinorim/mha4mysql-manager/releases/download/v0.58/mha4mysql-manager-0.58-0.el7.centos.noarch.rpm​​

wget ​​https://github.com/yoshinorim/mha4mysql-node/releases/download/v0.58/mha4mysql-node-0.58-0.el7.centos.noarch.rpm​​

管理节点安装manger和node软件包(master主库)

Node节点安装node软件包(salve1和slave2)

master节点的安装:

[root@master ~]# yum localinstall mha4mysql-* -y

 

两台台node节点的安装:

 yum localinstall mha4mysql-node-0.58-0.el7.centos.noarch.rpm -y

 

MHA manager管理工具:

 在manager节点安装完成后会生成一些管理工具，manager的主要管理工具有：

 masterha_check_ssh：检查MHA的SSH配置状况

 masterha_check_repl：检查MySQL复制状况

 masterha_manger：启动MHA

 masterha_check_status：检测当前MHA运行状态

 masterha_master_monitor：检测master是否宕机

 masterha_master_switch：控制故障转移（自动或者手动）

 masterha_conf_host：添加或删除配置的server信息

生成ssh秘钥:

由于MHA manager通过SSH访问所有的node节点，各个node节点也同样通过SSH来相互发送不同的relay log 文件，所以要在每一个node和manager上配置SSH无密码登陆。

master和node各个节点之间相互无秘钥登录:

[root@master ~]# ssh-keygen

# ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.40.42.103

# ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.40.42.105

# ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.40.42.127

 

[root@node1 ~]#  ssh-keygen

# ssh-copy-id -i /root/.ssh/id_rsa.pub ​​root@10.40.42.103​​

# ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.40.42.105

# ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.40.42.127

 

[root@node2 ~]#  ssh-keygen

[root@node2 ~]#  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.40.42.103

[root@node2 ~]#  ssh-copy-id -i /root/.ssh/id_rsa.pub ​​root@10.40.42.105​​

[root@node2 ~]#  ssh-copy-id -i /root/.ssh/id_rsa.pub root@10.40.42.127

 

三台主机/etc/hosts增加解析:

[root@master ~]# cat /etc/hosts  

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

10.40.42.103    master

10.40.42.105    node1

10.40.42.127   node2

 

​MHA配置:

三台主机创建mha远程数据目录:​

[root@master ~]# mkdir /etc/mha/data -p

 

创建mha.cnf作为mha的运行配置文件:

[root@master mha]# cat mha.cnf

[server default]

manager_workdir=/etc/mha/

manager_log=/etc/mha/app1.log

master_binlog_dir=/var/lib/mysql

master_ip_failover_script=/usr/local/bin/master_ip_failover

#master_ip_online_change_script=/usr/local/bin/master_ip_online_change

user=mhauser

password=1qaz@WSX

ping_interval=1

remote_workdir=/etc/mha/data

repl_user=rep

repl_password=1qaz@WSX

ssh_user=root

 

[server1]

hostname=10.40.42.103

port=3306

candidate_master=1

 

[server2]

hostname=10.40.42.105

port=3306

candidate_master=1

check_repl_delay=0

 

[server3]

hostname=10.40.42.127

port=3306

check_repl_delay=0

no_master=1

检验 mha master和node之间免秘钥登录:

[root@master mha]# masterha_check_ssh --conf /etc/mha/mha.cnf

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