mysql+MHA高可用+atlas读写分离（成产环境运用场景）
Posted 村里唯一的运维工程师
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准备四台服务器
第一台：c7m01 10.0.0.12 mysql-master
第二台：c7s02 10.0.0.13 mysql-slave（备用主）slave01
第三台：c7s03 10.0.0.14 mysql-slave slave02
第四台：c7a04 10.0.0.15 mha+atlas
vip 10.0.0.100 绑定到mysql-master
四台服务器执行同样的操作，时间同步操作
[root@ localhost ~]# echo "*/5* * * * /usr/sbin/ntpdate ntp1.aliyun.com >/dev/null 2>&1" >>/var/spool/cron/root
修改四台服务器的主机名
mysql-master主
[root@ localhost ~]# vim /etc/hostname
c7m01
mysql-slave从（备用主）
[root@ localhost ~]# vim /etc/hostname
c7s02
mysql-slave从
[root@ localhost ~]# vim /etc/hostname
c7s03
mha+atlas（读写分离）
[root@ localhost ~]# vim /etc/hostname
c7a04
注：主机名修改完成后需要重启，否则不会生效
在mysql-master mysql-slave上配置hosts解析（主机名字要和自己的主机名对应）
[root@ c7m01 ~]# vim /etc/hostEOF c7m01 10.0.0.12 c7s02 10.0.0.13 c7s03 10.0.0.14
关闭防火墙和selinux （四台服务器执行同样的操作）
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
[root@ c7m01 ~]# sed -i \' /^SELINUX/s#enforcing#disabled#g\' /etc/selinux/config
配置免密登录（四台服务器都要执行，这里我写了一个shell脚本）
[root@ c7a04 ~]# vim ssh.sh #!/bin/bash yum -y install sshpass &> /dev/null read -p "请输入服务器密码：" passwd UserName=root IP="10.0.0." #创建密钥 ssh-keygen -t dsa -f ~/.ssh/id_dsa -P "" &>/dev/null #分发公钥 for i in 12 13 14 15 #这里的要改成自己机子的ip do sshpass -p "$passwd" ssh-copy-id -i ~/.ssh/id_dsa.pub -p 22 -o StrictHostKeyChecking=no $UserName@$IP$i &>/dev/null done
执行脚本（四台服务器都要执行脚本），然后尝试连接其中一台服务器，如没有免密登录，即为成功
mysql安装yum repo（三台服务器执行同样的操作c7m01、c7s02、c7s03）
[root@ c7m01 ~]# wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm [root@ c7m01 ~]# rpm -ivh mysql-community-release-el7-5.noarch.rpm [root@ c7m01 ~]# yum -y install mysql-server
启动mysql，c7m01、c7s02、c7s03这三台服务器执行同样的操作
[root@ c7m01 ~]# systemctl restart mysql
修改mysql密码，c7m01、c7s02、c7s03这三台服务器执行同样的操作
[root@ c7m01 ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \\g. Your MySQL connection id is 2 Server version: 5.6.47 MySQL Community Server (GPL) Copyright (c) 2000, 2020, 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> update mysql.user set password=password(\'123456\') where user=\'root\' and host=\'localhost\'; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) mysql>
在c7m01上执行操作，修改mysql的配置文件
vim /etc/my.cnf [mysqld] server-id=1 log-bin=mysql-bin #禁止mysql自动删除relaylog工能 relay_log_purge = 0 #mysql5.6已上的特性，开启gtid，必须主从全开 gtid_mode = on enforce_gtid_consistency = 1 log_slave_updates = 1 更改完成后重启mysql systemctl restart mysql
创建用户同步
[root@ c7m01 ~]# mysql -uroot -p123456 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 2 Server version: 5.6.47-log MySQL Community Server (GPL) Copyright (c) 2000, 2020, 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> grant replication slave on *.* to \'rep\'@\'10.0.0.%\' identified by \'123456\'; Query OK, 0 rows affected (0.01 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)
查看MySQL主库的master状态
mysql> show master status\\G *************************** 1. row *************************** File: mysql-bin.000002 Position: 151 Binlog_Do_DB: Binlog_Ignore_DB: Executed_Gtid_Set: 1 row in set (0.00 sec) mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000002 | 151 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
查看GTID状态
mysql> show global variables like \'%gtid%\'; +---------------------------------+-------+ | Variable_name | Value | +---------------------------------+-------+ | binlog_gtid_simple_recovery | OFF | | enforce_gtid_consistency | ON | | gtid_executed | | | gtid_mode | ON | | gtid_owned | | | gtid_purged | | | simplified_binlog_gtid_recovery | OFF | +---------------------------------+-------+ 7 rows in set (0.01 sec)
c7s02上执行操作
修改mysql配置文件
vim /etc/my.cnf [mysqld] server-id=2 log-bin=mysql-bin #禁止mysql自动删除relaylog工能 relay_log_purge = 0 #mysql5.6已上的特性，开启gtid，必须主从全开 gtid_mode = on enforce_gtid_consistency = 1 log_slave_updates = 1 更改完成后重启mysql systemctl restart mysql
创建同步用户
[root@ c7s02 ~]# mysql -uroot -p123456 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 2 Server version: 5.6.47-log MySQL Community Server (GPL) Copyright (c) 2000, 2020, 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> grant replication slave on *.* to \'rep\'@\'10.0.0.%\' identified by \'123456\'; Query OK, 0 rows affected (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)
关闭复制功能，配置指向master，开启服务器复制状态，检查复制状态，出现俩个yes状态表示成功
mysql> stop slave; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> change master to -> master_host=\'10.0.0.12\', -> master_user=\'rep\', -> master_password=\'123456\', -> master_log_file=\'mysql-bin.000002\', -> master_log_pos=151; Query OK, 0 rows affected, 2 warnings (0.06 sec) mysql> mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) mysql> start slave; Query OK, 0 rows affected (0.00 sec) mysql> show slave status\\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.0.0.12 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 151 Relay_Log_File: mysqld-relay-bin.000002 Relay_Log_Pos: 314 Relay_Master_Log_File: mysql-bin.000002 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: 151 Relay_Log_Space: 519 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: 1 Master_UUID: c9c03e71-57ba-11ea-a442-000c29d39f7e Master_Info_File: /var/lib/mysql/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: 2c3c3e92-57bb-11ea-a445-000c2927e658:1-3 Auto_Position: 0 1 row in set (0.00 sec)
在c7s03执行操作
修改mysql配置文件
vim /etc/my.cnf [mysqld] server-id=3 log-bin=mysql-bin #禁止mysql自动删除relaylog工能 relay_log_purge = 0 #mysql5.6已上的特性，开启gtid，必须主从全开 gtid_mode = on enforce_gtid_consistency = 1 log_slave_updates = 1 更改完成后重启mysql systemctl restart mysql
创建用户同步
[root@ c7s03 ~]# mysql -uroot -p123456 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 2 Server version: 5.6.47-log MySQL Community Server (GPL) Copyright (c) 2000, 2020, 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> grant replication slave on *.* to \'rep\'@\'10.0.0.%\' identified by \'123456\'; Query OK, 0 rows affected (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec
关闭复制功能，配置指向master，开启服务器复制状态，检查复制状态，出现俩个yes状态表示成功
mysql> stop slave; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> change master to -> master_host=\'10.0.0.12\', -> master_user=\'rep\', -> master_password=\'123456\', -> master_log_file=\'mysql-bin.000002\', -> master_log_pos=151; Query OK, 0 rows affected, 2 warnings (0.36 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) mysql> start slave; Query OK, 0 rows affected (0.00 sec) mysql> show slave status\\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.0.0.12 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 151 Relay_Log_File: mysqld-relay-bin.000002 Relay_Log_Pos: 314 Relay_Master_Log_File: mysql-bin.000002 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: 151 Relay_Log_Space: 519 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: 1 Master_UUID: c9c03e71-57ba-11ea-a442-000c29d39f7e Master_Info_File: /var/lib/mysql/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: 75841405-57bb-11ea-a447-000c298eeea7:1-3 Auto_Position: 0 1 row in set (0.00 sec)
在四台服务器装MHA的依赖
yum -y install perl-dbd-mysql
yum -y install per-Config-Tiny epel-release perl-Log-Dispatch perl-Parallel-ForKManager perl-Time-HiRes
授权MHA管理用户（三台mysql服务器执行同样的操作）
mysql> grant all privileges on *.* to mha@\'10.0.0.%\' identified by \'mha\'; Query OK, 0 rows affected (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)
四台服务器安装node结点
[root@ c7m01 ~]# ll total 52 -rw-------. 1 root root 1277 2019-09-17 22:18 anaconda-ks.cfg -rw-r--r-- 1 root root 36328 2020-02-13 16:32 mha4mysql-node-0.58-0.el7.centos.noarch.rpm -rw-r--r-- 1 root root 6140 2015-11-12 15:58 mysql-community-release-el7-5.noarch.rpm -rw-r--r-- 1 root root 391 2020-02-25 18:24 ssh.sh [root@ c7m01 ~]# rpm -ivh mha4mysql-node-0.58-0.el7.centos.noarch.rpm error: Failed dependencies: perl(DBD::mysql) is needed by mha4mysql-node-0.58-0.el7.centos.noarch [root@ c7m01 ~]#
在c7a04上安装MHA的管理结点
[root@ c7a04 ~]# ll total 4972 -rw-------. 1 root root 1277 2019-09-17 22:18 anaconda-ks.cfg -rw-r--r-- 1 root root 4963681 2020-02-25 14:16 Atlas-2.2.1.el6.x86_64.rpm -rw-r--r-- 1 root root 81024 2020-02-13 16:32 mha4mysql-manager-0.58-0.el7.centos.noarch.rpm -rw-r--r-- 1 root root 36328 2020-02-13 16:32 mha4mysql-node-0.58-0.el7.centos.noarch.rpm -rw-r--r-- 1 root root 391 2020-02-25 18:23 ssh.sh [root@ c7a04 ~]# rpm -ivh mha4mysql-manager-0.58-0.el7.centos.noarch.rpm error: Failed dependencies: mha4mysql-node >= 0.54 is needed by mha4mysql-manager-0.58-0.el7.centos.noarch perl(Config::Tiny) is needed by mha4mysql-manager-0.58-0.el7.centos.noarch perl(DBD::mysql) is needed by mha4mysql-manager-0.58-0.el7.centos.noarch perl(DBI) is needed by mha4mysql-manager-0.58-0.el7.centos.noarch perl(MHA::BinlogManager) is needed by mha4mysql-manager-0.58-0.el7.centos.noarch perl(MHA::NodeConst) is needed by mha4mysql-manager-0.58-0.el7.centos.noarch perl(MHA::NodeUtil) is needed by mha4mysql-manager-0.58-0.el7.centos.noarch perl(MHA::SlaveUtil) is needed by mha4mysql-manager-0.58-0.el7.centos.noarch perl(Parallel::ForkManager) is needed by mha4mysql-manager-0.58-0.el7.centos.noarch [root@ c7a04 ~]# rpm -ivh mha4mysql-manager-0.58-0.el7.centos.noarch.rpm --nodeps --force Preparing... ################################# [100%] Updating / installing... 1:mha4mysql-manager-0.58-0.el7.cent################################# [100%] [root@ c7a04 ~]#
这里直接解压可能会出错，所以加一个--nodeps --force（这个东西可能后期会出现错误）
在c7a04上执行
配置MHA
[root@ c7a04 ~]# mkdir -p /etc/mha [root@ c7a04 ~]# mkdir -p /var/log/mha/app1 [root@ c7a04 ~]# vim /etc/mha/app1.cnf [server default] manager_log=/var/log/mha/app1/manager.log manager_workdir=/var/log/mha/app1 master_binlog_dir=/var/lib/mysql #binlog的目录，如果说miysql的环境不一样，binlog位置不同，每台服务器的binlog的位置写在server标签里面即可 user=mha password=mha ping_interval=2 repl_password=123456 repl_user=rep ssh_user=root [server1] hostname=10.0.0.12 port=3306 [server2] hostname=10.0.0.13 port=3306 [server3] hostname=10.0.0.14 port=3306 ignore_fail=1 #如果这个节点挂了，mha将不可用，加上这个参数，slave挂了一样可以用 no_master=1 #从不将这台主机转换为master #candidate_master=1 #如果候选master有延迟的话，relay日志超过100m，failover切换不能成功，加上此参数后会忽略延迟日志大小。 #check_repl_delay=0 #用防止master故障时,切换时slave有延迟,卡在那里切不过来 #注意这里的配置要把注释和空格全部删除
检查ssh
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