1、准備三台服務器
10.0.0.12
10.0.0.13
10.0.0.14
2、在三台服務器上執行操作
時間同步
[root@ c7m01 ~]# echo "*/5* * * * /usr/sbin/ntpdate ntp1.aliyun.com >/dev/null 2>&1" >>/var/spool/cron/root
修改主機名（主）
[root@ c7m01 ~]# vim /etc/hostname
c7m01
修改主機名（從）
[root@ c702 ~]# vim /etc/hostname
c702
修改主機名（從）
[root@ c703 ~]# vim /etc/hostname
c703
修改完主機名重啟機子就可以
3、三台服務器配置hosts解析（這里的主機名要和自己的一樣，以便於區分）
[root@ c7m01 ~]# vim /etc/hostsEOF c7m01 10.0.0.12 c702 10.0.0.13 c703 10.0.0.14
4、關閉防火牆和selinux （三台服務器執行同樣的操作）
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
[root@ c7m01 ~]# sed -i ' /^SELINUX/s#enforcing#disabled#g' /etc/selinux/config
5、配置免密登錄（三台服務器執行同樣的操作）
[root@ c7m01 ~]# vim ssh.sh #!/bin/bash yum -y install sshpass &> /dev/null read -p "請輸入服務器密碼：" passwd UserName=root IP="10.0.0." #創建密鑰 ssh-keygen -t dsa -f ~/.ssh/id_dsa -P "" &>/dev/null #分發公鑰 for i in 12 13 14 #這里的要改成自己機子的ip do sshpass -p "$passwd" ssh-copy-id -i ~/.ssh/id_dsa.pub -p 22 -o StrictHostKeyChecking=no $UserName@$IP$i &>/dev/null done
6、執行腳本配置，並連接其中一台服務器
[root@ c7m01 ~]# sh ssh.sh 請輸入服務器密碼：123456 [root@ c7m01 ~]# [root@ c7m01 ~]# ssh root@10.0.0.13 Last login: Fri Feb 14 00:14:41 2020 from 10.0.0.1 [root@ c702 ~]# exit logout Connection to 10.0.0.13 closed.
7、mysql安裝yum repo（三台服務器執行同樣的操作）
[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
8、啟動MySQL，三台服務器執行同樣的操作
[root@ c7m01 ~]# systemctl restart mysql
9、修改MySQL密碼，三台服務器執行同樣的操作
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>
主服務器上操作
10、在c7m01服務器上更改mysql配置文件
vim /etc/my.cnf [mysqld] server-id=1 log-bin=mysql-bin #禁止mysql自動刪除relaylog工能 relay_log_purge = 0 #mysql5.6已上的特性，開啟gtid，必須主從全開 gtid_mode = on enforce_gtid_consistency = 1 log_slave_updates = 1
更改完成后重啟mysql
systemctl restart mysql
11、創建同步用戶
[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)
12、查看MySQL主庫的master狀態
mysql> show master status\G *************************** 1. row *************************** File: mysql-bin.000002 Position: 530 Binlog_Do_DB: Binlog_Ignore_DB: Executed_Gtid_Set: f45fe1ec-53a4-11ea-899f-000c29d39f7e:1-2 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 | 530 | | | f45fe1ec-53a4-11ea-899f-000c29d39f7e:1-2 | +------------------+----------+--------------+------------------+------------------------------------------+ 1 row in set (0.00 sec)
13、查看GTID狀態
mysql> show global variables like '%gtid%'; +---------------------------------+------------------------------------------+ | Variable_name | Value | +---------------------------------+------------------------------------------+ | binlog_gtid_simple_recovery | OFF | | enforce_gtid_consistency | ON | #執行GTID模塊 | gtid_executed | f45fe1ec-53a4-11ea-899f-000c29d39f7e:1-2 | | gtid_mode | ON | #開啟GTID模塊 | gtid_owned | | | gtid_purged | | | simplified_binlog_gtid_recovery | OFF | +---------------------------------+------------------------------------------+ 7 rows in set (0.00 sec)
c702從服務器上操作
14、在c702服務器上更改mysql配置文件
vim /etc/my.cnf [mysqld] server-id=2 log-bin=mysql-bin #禁止mysql自動刪除relaylog工能 relay_log_purge = 0 #mysql5.6已上的特性，開啟gtid，必須主從全開 gtid_mode = on enforce_gtid_consistency = 1 log_slave_updates = 1 更改完成后重啟mysql systemctl restart mysql
15、創建同步用戶
[root@ c702 ~]# 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)
16、關閉復制功能，配置指向master，開啟服務器復制狀態，檢查復制狀態，出現倆個yes狀態表示成功
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=530; Query OK, 0 rows affected, 2 warnings (0.06 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) mysql> start slave; Query OK, 0 rows affected (0.01 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: 530 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: 530 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: f45fe1ec-53a4-11ea-899f-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: fdcedb5b-53a4-11ea-899f-000c2927e658:1-5 Auto_Position: 0 1 row in set (0.00 sec) mysql>
c703服務器
17、在c702服務器上更改mysql配置文件
vim /etc/my.cnf [mysqld] server-id=3 log-bin=mysql-bin #禁止mysql自動刪除relaylog工能 relay_log_purge = 0 #mysql5.6已上的特性，開啟gtid，必須主從全開 gtid_mode = on enforce_gtid_consistency = 1 log_slave_updates = 1 更改完成后重啟mysql systemctl restart mysql
18、創建同步用戶
[root@ c703 ~]# 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)
19、關閉復制功能，配置指向master，開啟服務器復制狀態，檢查復制狀態，出現倆個yes狀態表示成功
mysql> stop slave; Query OK, 0 rows affected (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=530; Query OK, 0 rows affected, 2 warnings (0.00 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: 530 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: 530 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: f45fe1ec-53a4-11ea-899f-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: 0033cbb6-53a5-11ea-899f-000c298eeea7:1-4 Auto_Position: 0 1 row in set (0.00 sec)
20、在三台服務器裝MHA的依賴
yum -y install perl-dbd-mysql
yum -y install per-Config-Tiny epel-release perl-Log-Dispatch perl-Parallel-ForKManager perl-Time-HiRes
21、授權MHA管理用戶（三台服務器執行同樣的操作）
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)
22、安裝MHA node節點
[root@ c7m01 ~]# ll total 140 -rw-------. 1 root root 1277 2019-09-17 22:18 anaconda-ks.cfg -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 6140 2015-11-12 15:58 mysql-community-release-el7-5.noarch.rpm -rw-r--r-- 1 root root 6140 2015-11-12 15:58 mysql-community-release-el7-5.noarch.rpm.1 -rw-r--r-- 1 root root 349 2020-02-13 16:53 ssh.sh [root@ c7m01 ~]# rpm -ivh mha4mysql-node-0.58-0.el7.centos.noarch.rpm Preparing... ################################# [100%] Updating / installing... 1:mha4mysql-node-0.58-0.el7.centos ################################# [100%] [root@ c7m01 ~]#
在c703上執行
如果安裝到錯誤的機器上可以撤銷掉，否則后期vip漂移會出錯
[root@ c7m01 ~]# rpm -qa |grep mha4mysql-manager-0.58-0.el7.centos.noarch.rpm [root@ c7m01 ~]# rpm -e mha4mysql-manager
23、安裝管理MHA的管理節點
[root@ c703 ~]# ll total 132 -rw-------. 1 root root 1277 2019-09-17 22:18 anaconda-ks.cfg -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 6140 2015-11-12 15:58 mysql-community-release-el7-5.noarch.rpm -rw-r--r-- 1 root root 349 2020-02-13 16:37 ssh.sh [root@ c703 ~]# rpm -ivh mha4mysql-manager-0.58-0.el7.centos.noarch.rpm Preparing... ################################# [100%] Updating / installing... 1:mha4mysql-manager-0.58-0.el7.cent################################# [100%]
24、配置MHA
[root@ c703 ~]# mkdir -p /etc/mha [root@ c703 ~]# mkdir -p /var/log/mha/app1 [root@ c703 ~]# 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的目錄，如果說miysql的環境不一樣，binlog位置不同，每台服務器的binlog的位置寫在server標簽里面即可 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 #如果這個節點掛了，mha將不可用，加上這個參數，slave掛了一樣可以用 no_master=1 #從不將這台主機轉換為master #candidate_master=1 #如果候選master有延遲的話，relay日志超過100m，failover切換不能成功，加上此參數后會忽略延遲日志大小。 #check_repl_delay=0 #用防止master故障時,切換時slave有延遲,卡在那里切不過來
#注意這里的配置要把注釋和空格全部刪除
檢查ssh
[root@ c703 ~]# masterha_check_ssh --conf=/etc/mha/app1.cnf Fri Feb 21 13:37:37 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping. Fri Feb 21 13:37:37 2020 - [info] Reading application default configuration from /etc/mha/app1.cnf.. Fri Feb 21 13:37:37 2020 - [info] Reading server configuration from /etc/mha/app1.cnf.. Fri Feb 21 13:37:37 2020 - [info] Starting SSH connection tests.. Fri Feb 21 13:37:38 2020 - [debug] Fri Feb 21 13:37:37 2020 - [debug] Connecting via SSH from root@10.0.0.12(10.0.0.12:22) to root@10.0.0.13(10.0.0.13:22).. Fri Feb 21 13:37:38 2020 - [debug] ok. Fri Feb 21 13:37:38 2020 - [debug] Connecting via SSH from root@10.0.0.12(10.0.0.12:22) to root@10.0.0.14(10.0.0.14:22).. Fri Feb 21 13:37:38 2020 - [debug] ok. Fri Feb 21 13:37:39 2020 - [debug] Fri Feb 21 13:37:37 2020 - [debug] Connecting via SSH from root@10.0.0.13(10.0.0.13:22) to root@10.0.0.12(10.0.0.12:22).. Fri Feb 21 13:37:39 2020 - [debug] ok. Fri Feb 21 13:37:39 2020 - [debug] Connecting via SSH from root@10.0.0.13(10.0.0.13:22) to root@10.0.0.14(10.0.0.14:22).. Fri Feb 21 13:37:39 2020 - [debug] ok. Fri Feb 21 13:37:40 2020 - [debug] Fri Feb 21 13:37:38 2020 - [debug] Connecting via SSH from root@10.0.0.14(10.0.0.14:22) to root@10.0.0.12(10.0.0.12:22).. Fri Feb 21 13:37:39 2020 - [debug] ok. Fri Feb 21 13:37:39 2020 - [debug] Connecting via SSH from root@10.0.0.14(10.0.0.14:22) to root@10.0.0.13(10.0.0.13:22).. Fri Feb 21 13:37:40 2020 - [debug] ok. Fri Feb 21 13:37:40 2020 - [info] All SSH connection tests passed successfully. [root@ c703 ~]#
這里放一個報錯的
解決辦法就是在三台服務器的mysql配置文件加一個跳過域名解析
skip-name-resolve
[root@ c703 ~]# masterha_check_repl --conf=/etc/mha/app1.cnf
25、啟動MHA
[root@ c703 ~]# nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1 &
[1] 6041
[root@ c703 ~]# ps -ef |grep mha
root 6041 4852 0 14:37 pts/0 00:00:00 perl /usr/bin/masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover
root 6066 4852 0 14:38 pts/0 00:00:00 grep --color=auto mha
26、查看MHA狀態
[root@ c703 ~]# masterha_check_status --conf=/etc/mha/app1.cnf app1 (pid:6041) is running(0:PING_OK), master:10.0.0.12
27、關閉MHA
[root@ c703 ~]# masterha_stop --conf=/etc/mha/app1.cnf Stopped app1 successfully. [1]+ Exit 1 nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1
28、從庫從新加入新生
[root@ c703 ~]# grep -i "CHANGE MASTER TO MASTER" /var/log/mha/app1/manager.log | tail -1
29、測試MHA故障轉移
停掉c7m01上的mysql 10.0.0.12
[root@ c7m01 ~]# systemctl stop mysql
30、在c703上查看slave的狀態，發現master_host變成10.0.0.13
[root@ c703 ~]# mysql -uroot -p123456 -e 'show slave status\G'; Warning: Using a password on the command line interface can be insecure. *************************** 1. row *************************** Slave_IO_State: Reconnecting after a failed master event read Master_Host: 10.0.0.13 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000003 Read_Master_Log_Pos: 191 Relay_Log_File: mysqld-relay-bin.000006 Relay_Log_Pos: 401 Relay_Master_Log_File: mysql-bin.000003 Slave_IO_Running: Connecting 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: 191 Relay_Log_Space: 2309 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: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 2003 Last_IO_Error: error reconnecting to master 'rep@10.0.0.12:3306' - retry-time: 60 retries: 4 Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 1 Master_UUID: f45fe1ec-53a4-11ea-899f-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: 200221 14:48:05 Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: f45fe1ec-53a4-11ea-899f-000c29d39f7e:3-4 Executed_Gtid_Set: 0033cbb6-53a5-11ea-899f-000c298eeea7:1-6, f45fe1ec-53a4-11ea-899f-000c29d39f7e:3-4 Auto_Position: 0
31、查看c703的配置文件
[root@ c703 ~]# cat /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 user=mha password=mha ping_interval=2 repl_password=123456 repl_user=rep ssh_user=root [server2] hostname=10.0.0.13 port=3306 [server3] hostname=10.0.0.14 port=3306 ignore_fail=1 no_master=1 #candidate_master=1 #check_repl_delay=0
當c7m01上的主庫盪機之后，MHA會自動檢查，發現主庫mysql停機，立刻會把從庫上提升為主庫，然后另一台服務器會把mysql主從復制的master_host改為新提升的主庫
32、MHA故障還原
先在c703上查看一下
[root@c703 ~]# grep "CHANGE MASTER TO MASTER" /var/log/mha/app1/manager.log | tail -1 Fri Feb 14 01:25:18 2020 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='10.0.0.12', MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER='rep', MASTER_PASSWORD='xxx';
33、在c7m01上執行
[root@c7m01 ~]# mysql -uroot -p123456 -e "CHANGE MASTER TO MASTER_HOST='10.0.0.13',MASTER_PORT=3306, MASTER_AUTO_POSITION=1,MASTER_USER='rep',MASTER_PASSWORD='123456';"
[root@c7m01 ~]# mysql -uroot -p123456 -e "start slave;" [root@c7m01 ~]# mysql -uroot -p123456 -e "show slave status \G"
這個時候的MHA是一次性的，當12上的mysql盪掉之后，就會把13的mysql變成主庫，當再次盪機之后，不會在發生改變
在c703上執行
34、修復mysql，將server1標簽加入到app1的配置文件中
[root@ c703 ~]# cat /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 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 no_master=1 #candidate_master=1 #check_repl_delay=0
34、重新啟動MHA
[root@ c703 ~]# nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1 & [1] 6041
配置vip漂移，有倆種方式
第一種是keepalived的方式，管理虛擬ip的漂移
第二種是MHA自帶腳本的方式，管理虛擬ip的漂移（這個漂移就是那個服務器的mysql庫提升為主庫，就漂移到那個上面，要根據binlog的最新slave方式提升）
35、MHA腳本方式
修改app1配置文件，添加
[root@ c703 ~]# vim /etc/mha/app1.cnf [server default] master_ip_failover_script=/usr/bin/master_ip_failover #添加這一行
編寫腳本
[root@ c703 ~]# vim /usr/bin/master_ip_failover #!/usr/bin/env perl use strict; use warnings FATAL => 'all'; use Getopt::Long; my ( $command, $ssh_user, $orig_master_host, $orig_master_ip, $orig_master_port, $new_master_host, $new_master_ip, $new_master_port ); my $vip = '10.0.0.100/24'; #這里的vip地址寫一個與自己IP地址相同的IP段 my $key = '1'; my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip"; #這里的網卡要看自己外網的外卡是不是ens33，不是的話要改成自己的外網網卡 my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down"; GetOptions( 'command=s' => \$command, 'ssh_user=s' => \$ssh_user, 'orig_master_host=s' => \$orig_master_host, 'new_master_ip=s' => \$new_master_ip, 'new_master_port=i' => \$new_master_port, ); exit &main(); sub main { print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n"; if ( $command eq "stop" || $command eq "stopssh" ) { my $exit_code = 1; eval { print "Disabling the VIP on old master: $orig_master_host \n"; &stop_vip(); $exit_code = 0; }; if ($@) { warn "Got Error: $@\n"; exit $exit_code; } exit $exit_code; } elsif ( $command eq "start" ) { my $exit_code = 10; eval { print "Enabling the VIP - $vip on the new master - $new_master_host \n"; &start_vip(); $exit_code = 0; }; if ($@) { warn $@; exit $exit_code; } exit $exit_code; } elsif ( $command eq "status" ) { print "Checking the Status of the script.. OK \n"; exit 0; } else { &usage(); exit 1; } } sub start_vip() { `ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`; } sub stop_vip() { return 0 unless ($ssh_user); `ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`; } 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"; }
36、給腳本加權限
[root@ c703 ~]# chmod +x /usr/bin/master_ip_failover
37、手動添加vip，綁定到主庫的機子上，我這里是10.0.0.13
[root@ c702 ~]# ifconfig ens33:1 10.0.0.100/24 [root@ c702 ~]# ip a show ens33 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:d3:9f:7e brd ff:ff:ff:ff:ff:ff inet 10.0.0.13/24 brd 10.0.0.255 scope global ens33 valid_lft forever preferred_lft forever inet 10.0.0.100/24 brd 10.0.0.255 scope global secondary ens33:1 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fed3:9f7e/64 scope link valid_lft forever preferred_lft forever
38、重啟MHA
[root@ c703 ~]# masterha_stop --conf=/etc/mha/app1.cnf Stopped app1 successfully. [1]+ Exit 1 nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1 [root@ c703 ~]# nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1 & [1] 6468
模擬主庫宕機vip飄移
在c702上操作
[root@ c702 ~]# systemctl stop mysql [root@ c702 ~]# ip a show ens33 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:d3:9f:7e brd ff:ff:ff:ff:ff:ff inet 10.0.0.12/24 brd 10.0.0.255 scope global ens33 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fed3:9f7e/64 scope link valid_lft forever preferred_lft forever
這個時候vip已經漂移到另一台服務器上，將另一台服務器做為主庫
查看c7m01上是否有vip漂移
[root@ c7m01 ~]# ip a show ens33 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:27:e6:58 brd ff:ff:ff:ff:ff:ff inet 10.0.0.13/24 brd 10.0.0.255 scope global ens33 valid_lft forever preferred_lft forever inet 10.0.0.100/24 brd 10.0.0.255 scope global secondary ens33:1 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe27:e658/64 scope link valid_lft forever preferred_lft forever
當vip漂移到另一台服務器上表示成功，然后查看MHA的服務器上是否改變到另一台服務器上的master_host
[root@ c703 ~]# mysql -uroot -p123456 -e 'show slave status\G'; Warning: Using a password on the command line interface can be insecure. *************************** 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.000003 Read_Master_Log_Pos: 231 Relay_Log_File: mysqld-relay-bin.000004 Relay_Log_Pos: 401 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: 231 Relay_Log_Space: 2892 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: 2 Master_UUID: fdcedb5b-53a4-11ea-899f-000c2927e658 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: fdcedb5b-53a4-11ea-899f-000c2927e658:1-7 Executed_Gtid_Set: 0033cbb6-53a5-11ea-899f-000c298eeea7:1-6, f45fe1ec-53a4-11ea-899f-000c29d39f7e:3-4, fdcedb5b-53a4-11ea-899f-000c2927e658:1-7 Auto_Position: 1 [1]+ Done nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1
這個時候MHA上app1配置文件里server2已經被誒剔除了
[root@ c703 ~]# cat /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 master_ip_failover_script=/usr/bin/master_ip_failover password=mha ping_interval=2 repl_password=123456 repl_user=rep ssh_user=root user=mha [server1] hostname=10.0.0.12 port=3306 [server3] hostname=10.0.0.14 ignore_fail=1 no_master=1 port=3306
這個時候開始修復，手動操作，將他恢復到之前的狀態
[root@ c703 ~]# grep "CHANGE MASTER TO MASTER" /var/log/mha/app1/manager.log | tail -1 Fri Feb 21 16:19:25 2020 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST='10.0.0.13', MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER='rep', MASTER_PASSWORD='xxx';
[root@c702 ~]#systemctl restart mysql
[root@c702 ~]# mysql -uroot -p123456 -e "CHANGE MASTER TO MASTER_HOST='10.0.0.12',MASTER_PORT=3306, MASTER_AUTO_POSITION=1,MASTER_USER='rep',MASTER_PASSWORD='123456';"
[root@c702 ~]# mysql -uroot -p123456 -e "start slave;" [root@c702 ~]# mysql -uroot -p123456 -e "show slave status \G"
#重啟MHA
nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1 &