mysql+MHA高可用集羣

時間  2020-09-08
標籤 mysql+mha mysql mha 可用 集羣 欄目 MySQL 简体版
原文   原文鏈接

一、準備三臺服務器
10.0.0.12
10.0.0.13
10.0.0.14
二、在三臺服務器上執行操做
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 node

c7m01
修改主機名（從）
[root@ c702 ~]# vim /etc/hostnamemysql

c702
修改主機名（從）
[root@ c703 ~]# vim /etc/hostname linux

c703
修改完主機名重啓機子就能夠
三、三臺服務器配置hosts解析（這裏的主機名要和本身的同樣，以便於區分）
[root@ c7m01 ~]# vim /etc/hostsEOF sql

c7m01 10.0.0.12
c702 10.0.0.13
c703 10.0.0.14
四、關閉防火牆和selinux （三臺服務器執行一樣的操做）
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
[root@ c7m01 ~]# sed -i ' /^SELINUX/s#enforcing#disabled#g' /etc/selinux/config
五、配置免密登陸（三臺服務器執行一樣的操做）
[root@ c7m01 ~]# vim ssh.shvim

#!/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."
#建立密鑰
ssh-keygen -t dsa -f ~/.ssh/id_dsa -P "" &>/dev/null
#分發公鑰
for i in 12 13 14 #這裏的要改爲本身機子的ip
do
sshpass -p "$passwd" ssh-copy-id -i ~/.ssh/id_dsa.pub -p 22 -o StrictHostKeyChecking=no $UserName@$IP$i &>/dev/null
done
六、執行腳本配置，並鏈接其中一臺服務器
[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.
七、mysql安裝yum repo（三臺服務器執行一樣的操做）
[root@ c7m01 ~]# wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpmcentos

[root@ c7m01 ~]# rpm -ivh mysql-community-release-el7-5.noarch.rpmbash

[root@ c7m01 ~]# yum -y install mysql-server
八、啓動MySQL，三臺服務器執行一樣的操做
[root@ c7m01 ~]# systemctl restart mysql
九、修改MySQL密碼，三臺服務器執行一樣的操做
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服務器

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)app

mysql>
主服務器上操做
十、在c7m01服務器上更改mysql配置文件
vim /etc/my.cnfless

[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，開啓gtid，必須主從全開
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates = 1更改完成後重啓mysqlsystemctl restart mysql

十一、建立同步用戶
[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)
[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)
十二、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)
1三、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 | #開啓GTID模塊
| gtid_owned | |
| gtid_purged | |
| simplified_binlog_gtid_recovery | OFF |
+---------------------------------+------------------------------------------+
7 rows in set (0.00 sec)
c702從服務器上操做
1四、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，開啓gtid，必須主從全開
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates = 1

更改完成後重啓mysql
systemctl restart mysql
1五、建立同步用戶
[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)
1六、關閉複製功能，配置指向master，開啓服務器複製狀態，檢查複製狀態，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
1七、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，開啓gtid，必須主從全開
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates = 1

更改完成後重啓mysql
systemctl restart mysql

1八、建立同步用戶

[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)

1九、關閉複製功能，配置指向master，開啓服務器複製狀態，檢查複製狀態，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、在三臺服務器裝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
2一、受權MHA管理用戶（三臺服務器執行一樣的操做）
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)
2二、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
若是安裝到錯誤的機器上能夠撤銷掉，不然後期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
2三、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%]

2四、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，若是說miysql的環境不同，binlog位置不一樣，每臺服務器的binlog的位置寫在server標籤裏面便可
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 #若是這個節點掛了，mha將不可用，加上這個參數，slave掛了同樣能夠用
no_master=1 #從不將這臺主機轉換爲master
#candidate_master=1 #若是候選master有延遲的話，relay日誌超過100m，failover切換不能成功，加上此參數後會忽略延遲日誌大小。
#check_repl_delay=0 #用防止master故障時,切換時slave有延遲,卡在那裏切不過來

#注意這裏的配置要把註釋和空格所有刪除

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 ~]#

這裏放一個報錯的
mysql+MHA高可用集羣

解決辦法就是在三臺服務器的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

2五、啓動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

2六、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
2七、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
2八、從庫重新加入新生
[root@ c703 ~]# grep -i "CHANGE MASTER TO MASTER" /var/log/mha/app1/manager.log | tail -1
2九、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

3一、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上的主庫蕩機以後，MHA會自動檢查，發現主庫mysql停機，馬上會把從庫上提高爲主庫，而後另外一臺服務器會把mysql主從複製的master_host改成新提高的主庫
3二、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';
3三、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蕩掉以後，就會把13的mysql變成主庫，當再次蕩機以後，不會在發生改變
在c703上執行
3四、修復mysql，將server1標籤加入到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

3四、從新啓動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庫提高爲主庫，就漂移到那個上面，要根據binlog的最新slave方式提高）
3五、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'; #這裏的vip地址寫一個與本身IP地址相同的IP段
my $key = '1';
my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip"; #這裏的網卡要看本身外網的外卡是否是ens33，不是的話要改爲本身的外網網卡
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";
}

3六、給腳本加權限
[root@ c703 ~]# chmod +x /usr/bin/master_ip_failover
3七、手動添加vip，綁定到主庫的機子上，我這裏是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

3八、重啓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上操做

[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已經漂移到另外一臺服務器上，將另外一臺服務器作爲主庫
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漂移到另外一臺服務器上表示成功，而後查看MHA的服務器上是否改變到另外一臺服務器上的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配置文件裏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，手動操做，將他恢復到以前的狀態

[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"

#重啓MHAnohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1 &

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