目录
一、MHA概述
1、简介
2、MHA特点
3、何为高可用
4、故障切换过程
二、MHA高可用架构部署
1、架构图
2、实验环境：需要四台Centos7服务器
3、实验部署
3.1、master、slave1、slave2安装mysql服务，之前博客有编译安装教程
3.2、master、slave1、slave2上配置my.cnf
3.3、在master、slave1、slave2上分别做两个软链接
3.4、重启3台MySQL服务，再查看端口，是否启动成功
3.5、配置主从复制
3.6、在manager主机上配置mha
3.7、配置无密码认证
3.8、在manager节点上配置MHA脚本
3.9、创建 MHA 软件目录并拷贝配置文件
三、测试
1、在manager端测试无密码认证
2、测试主从复制
3、启动mha
4、查看到当前的master节点
5、查看当前日志信息
6、模拟master宕机，slave1是否能顶上
一、MHA概述
1、简介
MHA（Master High Availability）目前在MySQL高可用方面是一个相对成熟的解决方案，MHA是由
日本人开发，是一套优秀的MySQL故障切换和主从复制的高可用软件。
在MySQL故障切换的过程中，MHA能做到0~30秒之内自动完成数据库的故障切换操作，并且在进行故障切换的过程中，MHA能够最大程度上保证数据库的一致性，以达到真正意义上的高可用。
MHA里有 两个角色一个是MHA Node（数据节点）另一个是MHA Manager（管理节点）。MHA Manager可以单独部署 在一台独立的机器上管理多个master-slave集群，也可以部署在一台slave节点上。MHA Node运行在每台 MySQL服务器上，MHA Manager会定时探测集群中的master节点，当master出现故障时，它可以自动将最新 数据的slave提升为新的master，然后将所有其他的slave重新指向新的master。整个故障转移过程对应用程序完全透明。
2、MHA特点
自动故障切换过程中，MHA总会试图从宕机的主服务器上保存二进制日志，最大程度的保证数据不丢失。
但这并不总是可行，例如如果主服务器硬件故障或者无法通过ssh访问，MHA则无法保存二进制日志，只能进行故障转移而丢失了最新的数据。此时，使用MySQL5.5的半同步复制，可以大大降低数据丢失的风险。MHA可以与半同步复制结合起来，如果只有一个slave已经收到了最新的二进制日志，MHA可以将最新的二进制日志应用于其他所有的slave服务器上，因此可以保证所有节点的数据一致性，有时候可故意设置从节点慢于主节点，当发生意外删除数据库倒是数据丢失时可从从节点二进制日志中恢复。
3、何为高可用
高可用就是可用性强，在一定条件下（某个服务器出错或宕机）可以保证服务器可以正常运行，在一定程度上不会影响业务的运行。
4、故障切换过程
当主服务器出现错误时，被manager服务器监控到主库mysqld服务停止后，首先对主库进行SSH登录检查（save_binary_logs -command=test），然后对mysqld服务进行健康检查（PING(SELECT)每个3秒检查一次，持续3次），最后作出Master is down!的判断，master failover开始进行对应的处理
二、MHA高可用架构部署
安装包下载：
https://download.csdn.net/download/m0_62948770/86724795
1、架构图
2、实验环境：需要四台Centos7服务器
①一台作为mha服务器（manager）来监控管理下面的MySQL服务器
②三台:一主两从MySQL服务器
| 主机 | IP |
|---|---|
| manager | 192.168.159.13 |
| master | 192.168.159.68 |
| slave1 | 192.168.159.11 |
| slave2 | 192.168.159.10 |
实验流程：
安装编译环境——> 安装MySQL5.6.36数据库——>配置时间同步——>配置主从复制与储备MySQL服务器——>安装node工具——>配置mha服务器——>测试验证
3、实验部署
3.1、master、slave1、slave2安装mysql服务，之前博客有编译安装教程
3.2、master、slave1、slave2上配置my.cnf
修改master的配置文件my.cnf
[root@master ~]# vim /etc/my.cnf[client]port = 3306#default-character-set=utf8## 注销字符集socket = /usr/local/mysql/mysql.sock[mysql]port = 3306#default-character-set=utf8 ## 注销字符集socket = /usr/local/mysql/mysql.sock[mysqld]user = mysqlbasedir = /usr/local/mysqldatadir = /usr/local/mysql/dataport = 3306#character_set_server=utf8## 注销字符集pid-file = /usr/local/mysql/mysqld.pidsocket = /usr/local/mysql/mysql.sockserver-id = 1##增加内容log_bin = master-bin log-slave-update = true修改slave1的配置文件my.cnf
[root@slave1 ~]# vim /etc/my.cnf[client]port = 3306#default-character-set=utf8socket = /usr/local/mysql/mysql.sock[mysql]port = 3306#default-character-set=utf8socket = /usr/local/mysql/mysql.sock[mysqld]user = mysqlbasedir = /usr/local/mysqldatadir = /usr/local/mysql/dataport = 3306#character_set_server=utf8pid-file = /usr/local/mysql/mysqld.pidsocket = /usr/local/mysql/mysql.sockserver-id =2 ## 修改为2 log_bin = master-bin ## 开启二进制日志relay-log = relay-log-bin## 使用中继日志进行同步 relay-log-index = slave-relay-bin.index## 索引修改slave2的配置文件my.cnf
[root@zew_slave2 ~]# vim /etc/my.cnf[client][mysql]port = 3306#default-character-set=utf8socket = /usr/local/mysql/mysql.sock[mysqld]user = mysqlbasedir = /usr/local/mysqldatadir = /usr/local/mysql/dataport = 3306#character_set_server=utf8pid-file = /usr/local/mysql/mysqld.pidsocket = /usr/local/mysql/mysql.sockserver-id = 3log_bin = master-binrelay-log = relay-log-binrelay-log-index = slave-relay-bin.index3.3、在master、slave1、slave2上分别做两个软链接
############ 只做master上的配置演示了 ###########################[root@master ~]# ln -s /usr/local/mysql/bin/mysql /usr/sbin[root@master ~]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin3.4、重启3台MySQL服务，再查看端口，是否启动成功
[root@master ~]# systemctl restart mysqld.service## 只演示master节点了
[root@master ~]# netstat -natp | grep 3306
tcp60 0 :::3306 :::*LISTEN 10503/mysqld
3.5、配置主从复制
在所有数据库节点上授权两个用户，一个是从数据库同步使用用户myslave，另一个是manager 使用用户mha
grant replication slave on *.* to ‘myslave’@’192.168.159.%’ identified by ‘123456’;
grant all privileges on *.* to ‘mha’@’192.168.159.%’ identified by ‘manager’;
下面三条授权理论上不用添加，但是实验环境通过MHA检查MySQL主从报错，报两个从库通过主机名连接不上主库，所以所有数据库都需要添加以下授权，通过mha检查的时候，是通过主机名的形式进行监控，这种情况会容易报错。
grant all privileges on *.* to ‘mha’@’master’ identified by ‘manager’;
grant all privileges on *.* to ‘mha’@’slave1’ identified by ‘manager’;
grant all privileges on *.* to ‘mha’@’slave2’ identified by ‘manager’;
把从库均设为只读功能：set global read_only=1;
master
[root@master ~]# mysql -uroot -pabc123mysql> grant replication slave on *.* to 'myslave'@'192.168.159.%' identified by '123456';Query OK, 0 rows affected, 1 warning (0.01 sec)mysql> grant all privileges on *.* to 'mha'@'192.168.159.%' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'master' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'slave1' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'slave2' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)slave1
[root@master ~]# mysql -uroot -pabc123mysql> grant replication slave on *.* to 'myslave'@'192.168.159.%' identified by '123456'; Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'192.168.159.%' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'master' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'slave1' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'slave2' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)#### 所有从库开启只读功能（不会对超级管理员super生效，普通用户）mysql> set global read_only=1;Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)slave2
[root@slave2 ~]# mysql -uroot -pabc123mysql> grant replication slave on *.* to 'myslave'@'192.168.159.%' identified by '123456';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'192.168.159.%' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'master' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'slave1' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> grant all privileges on *.* to 'mha'@'slave2' identified by 'manager';Query OK, 0 rows affected, 1 warning (0.00 sec)### 所有从库开启只读功能（不会对超级管理员super生效，普通用户）mysql> set global read_only=1;Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)同步
在master上查看二进制文件和同步点
mysql> show master status;+-------------------+----------+--------------+------------------+-------------------+| File| Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |+-------------------+----------+--------------+------------------+-------------------+| master-bin.000001 | 1595 ||| |+-------------------+----------+--------------+------------------+-------------------+1 row in set (0.00 sec)在slave1数据库中配置
mysql> change master to master_host='192.168.159.68',master_user='myslave',master_password='123456',master_log_file='master-bin.000001',master_log_pos=1595;Query OK, 0 rows affected, 2 warnings (0.01 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 eventMaster_Host: 192.168.159.68Master_User: myslaveMaster_Port: 3306Connect_Retry: 60Master_Log_File: master-bin.000001Read_Master_Log_Pos: 1595 Relay_Log_File: relay-log-bin.000002Relay_Log_Pos: 321Relay_Master_Log_File: master-bin.000001 Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_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: 0Exec_Master_Log_Pos: 1595Relay_Log_Space: 526Until_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: 0Master_SSL_Verify_Server_Cert: NoLast_IO_Errno: 0Last_IO_Error:Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: ............................................在slave2上数据库中配置
mysql> change master to master_host='192.168.159.68',master_user='myslave',master_password='123456',master_log_file='master-bin.000001',master_log_pos=1595;Query OK, 0 rows affected, 2 warnings (0.01 sec)mysql> start slave;Query OK, 0 rows affected (0.00 sec)mysql> show slave status\G;*************************** 1. row *************************** Slave_IO_State: Connecting to masterMaster_Host: 192.168.159.68Master_User: myslaveMaster_Port: 3306Connect_Retry: 60Master_Log_File: master-bin.000001Read_Master_Log_Pos: 1595 Relay_Log_File: relay-log-bin.000001Relay_Log_Pos: 4Relay_Master_Log_File: master-bin.000001 Slave_IO_Running: ConnectingSlave_SQL_Running: YesReplicate_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: 0Exec_Master_Log_Pos: 1595Relay_Log_Space: 154Until_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: NULLMaster_SSL_Verify_Server_Cert: NoLast_IO_Errno: 0.............................................3.6、在manager主机上配置mha
安装MHA依赖的环境及安装epel源（每台节点都需要安装这依赖环境，因为每台都要安装node）
yum install epel-release –nogpgcheck -y
yum install -y perl-DBD-MySQL \
perl-Config-Tiny \
perl-Log-Dispatch \
perl-Parallel-ForkManager \
perl-ExtUtils-CBuilder \
perl-ExtUtils-MakeMaker \
perl-CPAN
安装node(四台节点都需要安装，方法一样)
[root@manager ~]# cd /opt[root@manager opt]# rz -E ## 上传安装包到opt下rz waiting to receive.[root@manager opt]# lsmha4mysql-manager-0.57.tar.gzrhmha4mysql-node-0.57.tar.gz[root@manager opt]# tar zxf mha4mysql-node-0.57.tar.gz[root@manager opt]# cd mha4mysql-node-0.57/[root@manager mha4mysql-node-0.57]# perl Makefile.PL[root@manager mha4mysql-node-0.57]# make && make install安装manager组件
[root@manager mha4mysql-node-0.57]# cd /opt/[root@manager opt]# tar -zxvf mha4mysql-manager-0.57.tar.gz[root@manager opt]# cd mha4mysql-manager-0.57[root@manager mha4mysql-manager-0.57]# perl Makefile.PL[root@manager mha4mysql-manager-0.57]# make && make installmanager 安装后在/usr/local/bin 下面会生成几个工具，主要包括以下几个：
masterha_check_ssh ## 检查MHA的SSH的配置状况
masterha_check_repl ## 检查MySQL复制状况
masterha_manager## 启动manager脚本
masterha_check_status ## 检查当前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
masterha_stop## 关闭manager
[root@manager mha4mysql-manager-0.57]# cd /usr/local/bin/[root@manager bin]# lsapply_diff_relay_logsmasterha_master_monitorfilter_mysqlbinlog masterha_master_switchmasterha_check_replmasterha_secondary_checkmasterha_check_ssh masterha_stopmasterha_check_statuspurge_relay_logsmasterha_conf_host save_binary_logsmasterha_manager四台节点在node安装后都会在/usr/local/bin 下面会生成一下几个脚本（这些工具通常由MHA manager的脚本触发，无需人为操作）主要如下：
save_binary_logs### 保存和复制master的二进制日志
apply_diff_relay_logs ### 识别差异的中继日志事件并将其差异的事件应用于其他的slave
filter_mysqlbinlog### 去除不必要的ROLLBACK事件（MHA已不再使用这个工具）
purge_relay_logs### 清除中继日志（不会阻塞SQL线程）
[root@master mha4mysql-node-0.57]# cd /usr/local/bin/[root@master bin]# lsapply_diff_relay_logsfilter_mysqlbinlogpurge_relay_logssave_binary_logs3.7、配置无密码认证
①在 master 上配置到所有数据库节点的无密码认证
[root@master ~]# ssh-keygen -t rsaGenerating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa):## 回车Created directory '/root/.ssh'.Enter passphrase (empty for no passphrase): ## 回车Enter same passphrase again:## 回车Your identification has been saved in /root/.ssh/id_rsa.Your public key has been saved in /root/.ssh/id_rsa.pub.The key fingerprint is: ## 回车SHA256:TS1zC5lCuQRj/ILwKh8MGqSmcC1jubyE+rnWVg5k8bA root@masterThe key's randomart image is: ## 回车+---[RSA 2048]----+| .+... || .. o..oo+ ||o= * o..B o||=.* E o o+ = . ||=O B .S . .||= B . .||.+ + + ||. +.o .|| o+o |+----[SHA256]-----+ [root@master ~]# ssh-copy-id 192.168.159.11 ## 到slave1的免密登录/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"The authenticity of host '192.168.159.11 (192.168.159.11)' can't be established.ECDSA key fingerprint is SHA256:/foExVQ7yWnkh6o06Me2Naf74YXIhWUC7cZf5cC030k.ECDSA key fingerprint is MD5:83:dd:28:fc:10:70:e3:9c:bf:f0:26:0a:30:78:10:c2.Are you sure you want to continue connecting (yes/no)" />②在 slave1 上配置到所有数据库节点的无密码认证
ssh-keygen -t rsa
ssh-copy-id 192.168.159.11
ssh-copy-id 192.168.159.68
ssh-copy-id 192.168.159.10
ssh-copy-id 192.168.226.13
③在 slave2上配置到所有数据库节点的无密码认证
ssh-keygen -t rsa
ssh-copy-id 192.168.159.10
ssh-copy-id 192.168.159.68
ssh-copy-id 192.168.159.11
ssh-copy-id 192.168.226.13
④在 manager上配置到所有数据库节点的无密码认证
ssh-keygen -t rsa
ssh-copy-id 192.168.226.13
ssh-copy-id 192.168.159.68
ssh-copy-id 192.168.159.11
ssh-copy-id 192.168.226.10
3.8、在manager节点上配置MHA脚本
在 manager 节点上复制相关脚本到/usr/local/bin 目录
[root@manager scripts]# cp -ra /opt/mha4mysql-manager-0.57/samples/scripts/ /usr/local/bin
#-a：此选项通常在复制目录时使用，它保留链接、文件属性，并复制目录下的所有内容
#-r: 递归
[root@manager scripts]# ll /usr/local/bin/scripts/总用量 32-rwxr-xr-x 1 wangwu wangwu3648 5月31 2015 master_ip_failover#自动切换时 VIP管理 的脚本-rwxr-xr-x 1 wangwu wangwu9870 5月31 2015 master_ip_online_change #在线切换时 VIP 的管理-rwxr-xr-x 1 wangwu wangwu 11867 5月31 2015 power_manager #故障发生后关闭主机的脚本-rwxr-xr-x 1 wangwu wangwu1360 5月31 2015 send_report#因故障切换后发送报警的脚本 复制上述的自动切换时 VIP 管理的脚本到/usr/local/bin 目录，这里使用脚本管理 VIP
[root@manager scripts]# cd /usr/local/bin/scripts/[root@manager scripts]# lsmaster_ip_failover power_managermaster_ip_online_changesend_report[root@manager scripts]# cp master_ip_failover /usr/local/bin/[root@manager scripts]# 修改配置文件master_ip_failover（删除原有内容，直接复制）
[root@manager scripts]# pwd/usr/local/bin/scripts[root@manager scripts]# vim /usr/local/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 = '192.168.159.100'; ## 设置vipmy $brdc = '192.168.159.255';## 设置广播地址my $ifdev = 'ens33';my $key = '1';my $ssh_start_vip = "/sbin/ifconfig ens33:$key $vip";my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down";my $exit_code = 0;#my $ssh_start_vip = "/usr/sbin/ip addr add $vip/24 brd $brdc dev $ifdev label $ifdev:$key;/usr/sbin/arping -q -A -c 1 -I $ifdev $vip;iptables -F;";#my $ssh_stop_vip = "/usr/sbin/ip addr del $vip/24 dev $ifdev label $ifdev:$key";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,);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 \"`;}# A simple system call that disable the VIP on the old_mastersub stop_vip() {`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";}3.9、创建 MHA 软件目录并拷贝配置文件
[root@manager scripts]# pwd/usr/local/bin/scripts[root@manager scripts]# mkdir /etc/masterha[root@manager scripts]# cp /opt/mha4mysql-manager-0.57/samples/conf/app1.cnf /etc/masterha/[root@manager scripts]# vim /etc/masterha/app1.cnf[server default]manager_workdir=/var/log/masterha/app1manager_log=/var/log/masterha/app1/manager.logmaster_binlog_dir=/usr/local/mysql/data/## 修改下二进制日志的位置password=managerping_interval=1remote_workdir=/tmprepl_password=123456repl_user=myslavesecondary_check_script=/usr/local/bin/masterha_secondary_check -s 192.168.159.11 -s 192.168.159.10shutdown_script=""ssh_user=rootuser=mha[server1]hostname=192.168.159.68port=3306[server2]candidate_master=1hostname=192.168.226.11check_repl_delay=0port=3306[server3]hostname=192.168.226.10port=3306三、测试
1、在manager端测试无密码认证
[root@manager conf]# masterha_check_ssh -conf=/etc/masterha/app1.cnfTue Sep 27 22:58:26 2022 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.Tue Sep 27 22:58:26 2022 - [info] Reading application default configuration from /etc/masterha/app1.cnf..Tue Sep 27 22:58:26 2022 - [info] Reading server configuration from /etc/masterha/app1.cnf..Tue Sep 27 22:58:26 2022 - [info] Starting SSH connection tests..Tue Sep 27 22:58:28 2022 - [debug] Tue Sep 27 22:58:27 2022 - [debug]Connecting via SSH from root@192.168.159.10(192.168.159.10:22) to root@192.168.159.68(192.168.159.68:22)..Tue Sep 27 22:58:27 2022 - [debug] ok.Tue Sep 27 22:58:27 2022 - [debug]Connecting via SSH from root@192.168.159.10(192.168.159.10:22) to root@192.168.159.11(192.168.159.11:22)..Tue Sep 27 22:58:28 2022 - [debug] ok.Tue Sep 27 22:58:47 2022 - [debug] Tue Sep 27 22:58:26 2022 - [debug]Connecting via SSH from root@192.168.159.68(192.168.159.68:22) to root@192.168.159.11(192.168.159.11:22)..Tue Sep 27 22:58:36 2022 - [debug] ok.Tue Sep 27 22:58:36 2022 - [debug]Connecting via SSH from root@192.168.159.68(192.168.159.68:22) to root@192.168.159.10(192.168.159.10:22)..Tue Sep 27 22:58:47 2022 - [debug] ok.Tue Sep 27 22:58:47 2022 - [debug] Tue Sep 27 22:58:26 2022 - [debug]Connecting via SSH from root@192.168.159.11(192.168.159.11:22) to root@192.168.159.68(192.168.159.68:22)..Tue Sep 27 22:58:37 2022 - [debug] ok.Tue Sep 27 22:58:37 2022 - [debug]Connecting via SSH from root@192.168.159.11(192.168.159.11:22) to root@192.168.159.10(192.168.159.10:22)..Tue Sep 27 22:58:47 2022 - [debug] ok.Tue Sep 27 22:58:47 2022 - [info] All SSH connection tests passed successfully.最后结果为tests passed successfully，表示测试正常
2、测试主从复制
[root@manager conf]# masterha_check_repl -conf=/etc/masterha/app1.cnfTue Sep 27 23:00:45 2022 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.Tue Sep 27 23:00:45 2022 - [info] Reading application default configuration from /etc/masterha/app1.cnf..Tue Sep 27 23:00:45 2022 - [info] Reading server configuration from ...............................................................................Tue Sep 27 23:01:09 2022 - [warning] shutdown_script is not defined.Tue Sep 27 23:01:09 2022 - [info] Got exit code 0 (Not master dead).MySQL Replication Health is OK.最后测试结果为;MySQL Replication Health is OK 。 表示测试正常
3、启动mha
在master节点上配置ens33：1的虚拟子接口，给与VIP：192.168.159.100/24
[root@manager conf]# nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover /var/log/masterha/app1/manager.log 2>&1 &[1] 8982## 查询当前的master角色[root@manager conf]# masterha_check_status --conf=/etc/masterha/app1.cnfapp1 (pid:8982) is running(0:PING_OK), master:192.168.159.68 ## 当前master解释：
ohup//选项
masterha_manager//开启
--conf=/etc/masterha/app1.cnf //指定配置文件
--remove_dead_master_conf //当master服务器失效时，发生主从切换后，会把旧的master的ip从主配置文件删
--ignore_last_failover//忽略故障转移，忽略掉总是宕机不够可靠的服务器
4、查看到当前的master节点
[root@manager conf]# masterha_check_status --conf=/etc/masterha/app1.cnfapp1 (pid:8982) is running(0:PING_OK), master:192.168.159.68### 当前master为192.168.159.685、查看当前日志信息
[root@manager conf]# tail -f /var/log/masterha/app1/manager.log IN SCRIPT TEST====/sbin/ifconfig ens33:1 down==/sbin/ifconfig ens33:1 192.168.159.100===Checking the Status of the script.. OK Tue Sep 27 23:12:10 2022 - [info]OK.Tue Sep 27 23:12:10 2022 - [warning] shutdown_script is not defined.Tue Sep 27 23:12:10 2022 - [info] Set master ping interval 1 seconds.Tue Sep 27 23:12:10 2022 - [info] Set secondary check script: /usr/local/bin/masterha_secondary_check -s 192.168.159.11 -s 192.168.159.10Tue Sep 27 23:12:10 2022 - [info] Starting ping health check on 192.168.159.68(192.168.159.68:3306)..Tue Sep 27 23:12:10 2022 - [info] Ping(SELECT) succeeded, waiting until MySQL doesn't respond..6、模拟master宕机，slave1是否能顶上
①vip在master主机上
②关闭master上的MySQL服务
[root@master ~]# systemctl stop mysqld.service#####查看发现虚拟VIP没有了[root@master ~]# ifconfig ens33: flags=4163mtu 1500inet 192.168.159.68netmask 255.255.255.0broadcast 192.168.159.255inet6 fe80::ce01:2f86:7a80:ce3cprefixlen 64scopeid 0x20ether 00:0c:29:66:d9:2ftxqueuelen 1000(Ethernet)RX packets 12157bytes 5819674 (5.5 MiB)RX errors 0dropped 0overruns 0frame 0TX packets 6723bytes 922189 (900.5 KiB)TX errors 0dropped 0 overruns 0carrier 0collisions 0lo: flags=73mtu 65536inet 127.0.0.1netmask 255.0.0.0inet6 ::1prefixlen 128scopeid 0x10looptxqueuelen 1000(Local Loopback)RX packets 12239bytes 986082 (962.9 KiB)RX errors 0dropped 0overruns 0frame 0TX packets 12239bytes 986082 (962.9 KiB)TX errors 0dropped 0 overruns 0carrier 0collisions 0virbr0: flags=4099mtu 1500inet 192.168.122.1netmask 255.255.255.0broadcast 192.168.122.255ether 52:54:00:44:ba:9btxqueuelen 1000(Ethernet)RX packets 0bytes 0 (0.0 B)RX errors 0dropped 0overruns 0frame 0TX packets 0bytes 0 (0.0 B)TX errors 0dropped 0 overruns 0carrier 0collisions 0③在原先slave1上查看ifconfig，发现VIP 漂移过来了。slave1成为了新的master
[root@slave1 ~]# ifconfig ens33: flags=4163mtu 1500inet 192.168.159.11netmask 255.255.255.0broadcast 192.168.159.255inet6 fe80::8d62:30c7:5d56:1dbbprefixlen 64scopeid 0x20ether 00:0c:29:13:31:5etxqueuelen 1000(Ethernet)RX packets 4734bytes 600130 (586.0 KiB)RX errors 0dropped 0overruns 0frame 0TX packets 4093bytes 742333 (724.9 KiB)TX errors 0dropped 0 overruns 0carrier 0collisions 0ens33:1: flags=4163mtu 1500inet 192.168.159.100netmask 255.255.255.0broadcast 192.168.159.255ether 00:0c:29:13:31:5etxqueuelen 1000(Ethernet)lo: flags=73mtu 65536inet 127.0.0.1netmask 255.0.0.0inet6 ::1prefixlen 128scopeid 0x10looptxqueuelen 1000(Local Loopback)RX packets 375bytes 41807 (40.8 KiB)RX errors 0dropped 0overruns 0frame 0TX packets 375bytes 41807 (40.8 KiB)TX errors 0dropped 0 overruns 0carrier 0collisions 0virbr0: flags=4099mtu 1500inet 192.168.122.1netmask 255.255.255.0broadcast 192.168.122.255ether 52:54:00:bd:1f:d5txqueuelen 1000(Ethernet)RX packets 0bytes 0 (0.0 B)RX errors 0dropped 0overruns 0frame 0TX packets 0bytes 0 (0.0 B)TX errors 0dropped 0 overruns 0carrier 0collisions 0进入slave1的数据库中查看状态
