高性能MYSQL---MHA 故障切换

红太狼 2023-07-13 12:11 35阅读 0赞

### 文章目录 ###

*  一、MHA简介
 *  二、MHA服务的角色
 *  三、MHA提供的工具
 *  四、MHA的工作原理
 *  五、实现步骤
 *   *  1.MHA manager节点
     *   *  1.手动死切
         *  2.手动活切
         *  3.半自动故障转移( failover )
         *  4.配置 vip 漂移
         *   *  1.手动测试vip漂移
             *  2.测试全自动漂移

# 一、MHA简介 #

**MHA（Master HA）是一款开源的 MySQL 的高可用程序，它为 MySQL 主从复制架构提供了 automating master failover 功能。** MHA 在监控到 master 节点故障时，会提升其中拥有最新数据的 slave 节点成为新的master 节点，在此期间，MHA 会通过于其它从节点获取额外信息来避免一致性方面的问题。MHA 还提供了 master 节点的在线切换功能，即按需切换 master/slave 节点。

`failover :网络 故障转移; 故障切换;`

MHA 能够在30秒内实现故障切换，并能在故障切换中，最大可能的保证数据一致性。目前淘宝也正在开发相似产品 TMHA， 目前已支持一主一从。

# 二、MHA服务的角色 #

MHA 服务有两种角色,MHA Manager(管理节点)和MHA Node(数据节点)

**MHA Manager：**

*  通常单独部署在一台独立机器上管理多个 master/slave 集群(组)，每个 master/slave 集群称作一个 application，用来管理统筹整个集群。

**MHA node：**

*  运行在每台 MySQL 服务器上(master/slave/manager)，它通过监控具备解析和清理 logs 功能的脚本来加快故障转移。
 *  主要是接收管理节点所发出指令的代理，代理需要运行在每一个 mysql 节点上。简单讲 node 就是用来收集从节点服务器上所生成的 bin-log 。对比打算提升为新的主节点之上的从节点的是否拥有并完成操作，如果没有发给新主节点在本地应用后提升为主节点。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70]  
由上图我们可以看出，每个复制组内部和 Manager 之间都需要ssh实现无密码互连，只有这样，在 Master 出故障时， Manager 才能顺利的连接进去，实现主从切换功能。

# 三、MHA提供的工具 #

MHA会提供诸多工具程序。

**Manager节点：**

masterha_check_ssh：MHA 依赖的 ssh 环境监测工具；
    masterha_check_repl：MYSQL 复制环境检测工具；
    masterga_manager：MHA 服务主程序；
    masterha_check_status：MHA 运行状态探测工具；
    masterha_master_monitor：MYSQL master 节点可用性监测工具；
    masterha_master_swith:master：节点切换工具；
    masterha_conf_host：添加或删除配置的节点；
    masterha_stop：关闭 MHA 服务的工具。

**Node节点：（这些工具通常由MHA Manager的脚本触发，无需人为操作）**

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应用于其他 slave；
    purge_relay_logs：清除中继日志（不会阻塞 SQL 线程）；

# 四、MHA的工作原理 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 1]

MHA工作原理总结为以下几条：
    （1） 从宕机崩溃的 master 保存二进制日志事件（binlog events）；
    （2） 识别含有最新更新的 slave ；
    （3） 应用差异的中继日志(relay log) 到其他 slave ；
    （4） 应用从 master 保存的二进制日志事件(binlog events)；
    （5） 提升一个 slave 为新 master ；
    （6） 使用其他的 slave 连接新的 master 进行复制。

# 五、实现步骤 #

MHA 对 MYSQL 复制环境有特殊要求，例如各节点都要开启二进制日志及中继日志，各从节点必须显示启用其read-only属性，并关闭relay\_log\_purge功能等。

实验环境:

server1  主数据库  172.25.2.10
    server2  从数据库   172.25.2.11
    server3  从代理器  172.25.2.254
    真机     MHAmanager 172.25.2.250
    
    关闭4台主机的防火墙和selinux

前提做好4台数据库的主从复制，这里采用基于GTID的主从复制。  
并且应该在每个主机上编写 /etc/hosts文件，便于后面的ssh 连接。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 2]  
1.server1中的my.cnf的配置文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 3]

server-id = 1              //复制集群中的各节点的id均必须唯一 
    log_slave_updates = on       //使得更新的数据写进二进制日志中
     log-bin =binlog        //开启二进制日志

2.server2中的配置文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 4]  
3.server3中的配置文件  
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4.开启server1  
![在这里插入图片描述][20200311214421928.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 6]  
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5.对server2做配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 9]  
进行初始化并且登录进数据库之后  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 10]  
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6.对server3进行相应配置  
登陆进数据库  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 12]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 13]  
**以server1为主，server2，server3为从数据库的基GTID的主从复制到此完成。**

## 1.MHA manager节点 ##

真机,172.25.2.250,用于监控管理，它是整个集群的控制器。(此处当做server4，该实验也可以用新开启一个虚拟机当server4来)

1.安装软件

yum	install	-y	mha4mysql-manager-0.58-0.el7.centos.noarch.rpm	perl-* mha4mysql-node-0.58-0.el7.centos.noarch.rpm

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 14]  
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2.配置免密访问（server4 需要连接 server1 2 3 都免密码）

先生成密钥  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 16]  
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发送密钥  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 18]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 20]  
测试免密登录  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 21]  
3.其他 3 个节点（服务器）都安装 `mha4mysql-node-0.58-0.el7.centos.noarch.rpm`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 22]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 23]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 24]  
4.在manager节点配置 mha 工作目录及配置文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 25]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 26]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 27]  
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5.检测 ssh 连接

masterha_check_ssh --conf=/etc/masterha/app1.cnf
    
    发现报错，server1 2 3 互相之间不免密拷贝

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 29]  
真机上的密钥给 server1 2 3  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 30]  
再检测 ssh，成功

6.接下来在真机（server4）上检测复制功能

masterha_check_repl --conf=/etc/masterha/app1.cnf

![在这里插入图片描述][20200311215715605.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 31]  
发现有报错,这是因为 manager 默认是用 root 远程连接数据库，但是在配置server1主数据库是已经禁用了 root 的远程连接

在主库上授权用户

grant all on *.* to root@'%' identified by 'Westos+001';

![在这里插入图片描述][20200311215849626.png]  
再次在manager检测时，正确  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 32]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 33]  
7.测试 manager 能否开启

nohup	masterha_manager	--conf=/etc/masterha/app1.cnf
    --remove_dead_master_conf	--ignore_last_failover	<	/dev/null	> /var/log/masterha.log 2>&1 & 打入后台运行

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 34]  
8.测试**手动** failover 切换先关闭 manager，不关的话切不了，manager 就是自动切换的工具  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 35]

### 1.手动死切 ###

手动切换之前，需要保证主从同步正常，repl 复制用户能够远程连接’ 中间都选 yes。

**关闭master：server1主服务器的mysqld服务，开始死切**

**在server1上**

systemctl stop mysqld

![在这里插入图片描述][2020031122015262.png]  
**在manager上**

masterha_master_switch --master_state=dead --conf=/etc/masterha/app1.cnf --dead_master_host=172.25.2.10 --dead_master_ip=172.25.0.1
    --dead_master_port=3306	--new_master_host=172.25.2.11
    --new_master_port=3306

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 36]  
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切换成功后，可以在 server3 上看到它的 master 已经变成了 server2( 而 server2 已经时是master 了再手动开启 server1，作为 slave 加入集群  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 38]  
将server1作为slave加入集群。  
![在这里插入图片描述][2020031122051339.png]  
![在这里插入图片描述][20200311220529931.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 39]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 40]  
当完成一次手动切换后，manager上生成了如下文件  
![在这里插入图片描述][20200311220616921.png]  
在/etc/masterha 目录下生成一个 app1.failover.complete 文件，是来记录 failover 情况的，再进行 failover 时必须先把这个文件删除，不然不会 failover，会出现错误。

### 2.手动活切 ###

手动在线切换，刚才是 master 挂掉后切换，现在是master在线时切换。

**在manager中**

masterha_master_switch	--conf=/etc/masterha/app1.cnf	--master_state=alive
    --new_master_host=172.25.2.10	--new_master_port=3306
    --orig_master_is_new_slave --running_updates_limit=10000

![在这里插入图片描述][20200311220740203.png]  
![在这里插入图片描述][20200311220753694.png]  
![在这里插入图片描述][20200311220803961.png]  
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又切换回 172.25.2.10 为 master  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 42]

### 3.半自动故障转移( failover ) ###

首先清理 app1.failover.complete

1.开启mha manager

nohup	masterha_manager   --conf=/etc/masterha/app1.cnf &>/dev/null &

![在这里插入图片描述][20200311220941563.png]  
mha manager 自带守护进程,在 server1 上查看  
![在这里插入图片描述][20200311221006841.png]  
![在这里插入图片描述][20200311221019517.png]  
再查看，发现 mysql 进程又自动开启了  
![在这里插入图片描述][20200311221042111.png]  
在 server1 上手动关闭 mysqld  
![在这里插入图片描述][20200311221101963.png]  
在manager上查看日志，发现已经切换，同时 manager 进程退出，所以全自动需要脚本先把 server1 加回集群  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 43]  
**在server1上**

CHANGE MASTER TO MASTER_HOST = '172.25.2.11', MASTER_USER = 'repl',
    MASTER_PASSWORD = 'Wssss', MASTER_AUTO_POSITION = 1;

start slave;

此时master自动切为server2，此时我们启动server1上的mysqld服务，将其加入slave从节点

### 4.配置 vip 漂移 ###

因为用户访问入口只能有一个，对客户端来说，访问的vip，只能有一个，客户端感受不到后端多台数据库服务器在服务。所以需要配置 vip，当发生故障时，谁获得vip,谁上线。

**1.在manager中,编辑 master\_ip\_failover 和 master\_ip\_online\_change 两个脚本  
配置自动添加和删除 vip**  
![在这里插入图片描述][20200311221434897.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 44]  
![在这里插入图片描述][20200311221510279.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 45]  
![在这里插入图片描述][20200311221536437.png]  
![在这里插入图片描述][20200311221549909.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 46]  
注意在 manager 的配置文件种这两行的注释要打开

master_ip_failover_script= /usr/local/bin/master_ip_failover 
    master_ip_online_change_script= /usr/local/bin/master_ip_online_change

![在这里插入图片描述][20200311221646175.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 47]  
刚开始，已经将serevr1设置成主库  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 48]  
在manager中关闭 mha  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 49]

#### 1.手动测试vip漂移 ####

手动测试 vip 漂移(在线切)：活切  
![在这里插入图片描述][20200311221846154.png]  
可以看到切换 vip  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 50]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 51]  
server2获得vip  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 52]  
server2成为主库  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 53]

#### 2.测试全自动漂移 ####

![在这里插入图片描述][20200311222020807.png]  
manager开启MHA  
![在这里插入图片描述][20200311222037679.png]  
serevr2上关闭mysqld  
![在这里插入图片描述][20200311222054839.png]  
manager查看日志  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 54]  
可以看到切换成功，vip 也成功漂移 server1成为主库  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 55]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzkzNjk2OQ_size_16_color_FFFFFF_t_70 56]

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