MAH一：MAH架構(gòu)介紹 MHA (Master High Availability)目前在MySQL高可用方面是一個(gè)相對(duì)成熟的解決方案，它由日本人youshimaton開(kāi)發(fā)，是一套優(yōu)秀的作為MySQL高可用性環(huán)境下故障切換和主從提升的高可用軟件。在MySQL故障切換過(guò)程中，MHA能做到0~30秒之內(nèi)自動(dòng)完成數(shù)據(jù)庫(kù)的故障切換操作，并且在進(jìn)行故障切換的過(guò)程中，MHA能最大程度上保證數(shù)據(jù)庫(kù)的一致性，以達(dá)到真正意義上的高可用。 MHA由兩部分組成:MHA Manager (管理節(jié)點(diǎn))和MHANode(數(shù)據(jù)節(jié)點(diǎn))。MHA Manager可以獨(dú)立部署在一臺(tái)獨(dú)立的機(jī)器上管理多個(gè)Master-Slave集群，也可以部署在一臺(tái)Slave上。當(dāng)Master 出現(xiàn)故障是，它可以自動(dòng)將最新數(shù)據(jù)的Slave 提升為新的Master,然后將所有其他的Slave重新指向新的Master。整個(gè)故障轉(zhuǎn)移過(guò)程對(duì)應(yīng)用程序是完全透明的。二：適用場(chǎng)景

目前MHA主要支持一主多從的架構(gòu)，要搭建MHA，要求一個(gè)復(fù)制集群必須最少有3臺(tái)數(shù)據(jù)庫(kù)服務(wù)器，一主二從，即一臺(tái)充當(dāng)Master ,一臺(tái)充當(dāng)備用Master，另一臺(tái)充當(dāng)從庫(kù)。出于成本考慮，淘寶在此基礎(chǔ)上進(jìn)行了改造，目前淘寶開(kāi)發(fā)的 TMHA 已經(jīng)支持一主一從。

三：MHA工作原理

1.從宕機(jī)崩潰的 Master保存二進(jìn)制日志事件(binlog event) ;

2.識(shí)別含有最新更新的Slave;

3.應(yīng)用差異的中繼日志(relay log)到其他Slave;

4.應(yīng)用從 Master 保存的二進(jìn)制日志事件;

5.提升—個(gè) Slave為新的Master;

6.使其他的 Slave 連接新的 Master 進(jìn)行復(fù)制;

四：MHA的組成 Manager工具包 Node工具包

1：Manager工具包

masterha_check_ssh:檢查MHA的 SSH配置情況 masterha_check_repl:檢查MySQL復(fù)制狀況 masterha_manager:啟動(dòng)MHA masterha_check_status:檢測(cè)當(dāng)前MHA運(yùn)行狀態(tài) masterha_master_monitor:檢測(cè)Master是否宕機(jī) masterha_master_switch:控制故障轉(zhuǎn)移(自動(dòng)或手動(dòng)) masterha_conf_host:添加或刪除配置的server 信息

2：Node工具包

通常由MHA Manager的腳本觸發(fā)，無(wú)需人工操作

save_binary_logs:保存和復(fù)制Master 的 binlog日志 apply_diff_relay_logs:識(shí)別差異的中級(jí)日志時(shí)間并將其應(yīng)用到其他 Slave filter_mysqlbinlog:去除不必要的ROOLBACK事件（已經(jīng)廢棄) purge_relay_logs:清除中繼日志（不阻塞SQL線程)五：MHA 特點(diǎn) 自動(dòng)故障切換過(guò)程中，MHA試圖從宕機(jī)的主服務(wù)器上保存進(jìn)制日志,最大程度的保證數(shù)據(jù)不丟失 使用半同步復(fù)制，可以大大降低數(shù)據(jù)丟失的風(fēng)險(xiǎn) 目前MHA支持一主多從架構(gòu)，最少三臺(tái)服務(wù)，即一主兩從MHA 架構(gòu)部署一：拓?fù)鋱D

二：數(shù)據(jù)庫(kù)安裝

MySQL 版本使用 5.6.36、cmake 版本使用 2.8.6

1：安裝編譯依賴的環(huán)境

[root@master ~]# yum -y install ncurses-devel gcc-c++ perl-Module-Install

2.：安裝 gmake 編譯軟件

[root@master ~]# tar zxvf cmake-2.8.6.tar.gz[root@master ~]# cd cmake-2.8.6[root@master cmake-2.8.6]# ./configure[root@master cmake-2.8.6]# gmake && gmake install

3：安裝 MySQL 數(shù)據(jù)庫(kù)

[root@master ~]# tar -zxvf mysql-5.6.36.tar.gz[root@master ~]# cd mysql-5.6.36[root@master mysql-5.6.36]# cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_EXTRA_CHARSETS=all -DSYSCONFDIR=/etc[root@master mysql-5.6.36]# make && make install[root@master mysql-5.6.36]# cp support-files/my-default.cnf /etc/my.cnf[root@master mysql-5.6.36]# cp support-files/mysql.server /etc/rc.d/init.d/mysqld[root@master ~]# chmod +x /etc/rc.d/init.d/mysqld[root@master ~]# chkconfig --add mysqld[root@master ~]# echo 'PATH=$PATH:/usr/local/mysql/bin' >> /etc/profile[root@master ~]# source /etc/profilechown -R mysql.mysql /usr/local/mysql groupadd mysql[root@master ~]# useradd -M -s /sbin/nologin mysql -g mysql[root@master ~]# chown -R mysql.mysql /usr/local/mysql[root@master ~]# mkdir -p /data/mysql[root@master ~]# /usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql

4：修改 Master 的主配置文件/etc/my.cnf 文件

將原來(lái)配置全部刪除

[root@master ~]# vi /etc/my.cnf[client]port = 3306socket = /usr/local/mysql/mysql.sock[mysql]port = 3306socket = /usr/local/mysql/mysql.sock[mysqld]user = mysqlbasedir = /usr/local/mysqldatadir = /usr/local/mysql/dataport = 3306pid-file = /usr/local/mysql/mysqld.pidsocket = /usr/local/mysql/mysql.sockserver-id = 1log_bin = master-binlog-slave-updates = truesql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,PIPES_AS_CONCAT,ANSI_QUOTES

另外兩臺(tái) slave 數(shù)據(jù)庫(kù)

三臺(tái)服務(wù)器的 server-id 不能一樣，其余一樣正常寫(xiě)入

server-id = 2log_bin = master-binrelay-log = relay-log-bin relay-log-index = slave-relay-bin.index

server-id = 3log_bin = master-binrelay-log = relay-log-bin relay-log-index = slave-relay-bin.index

5：三臺(tái)數(shù)據(jù)庫(kù)分別做兩個(gè)軟鏈接，軟鏈接是為 HMA 服務(wù)的

[root@master ~]# ln -s /usr/local/mysql/bin/mysql /usr/sbin/[root@master ~]# ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin/

6：三臺(tái)數(shù)據(jù)庫(kù)啟動(dòng) MySQL

[root@master ~]# /usr/local/mysql/bin/mysqld_safe --user=mysql &[root@master ~]# service mysqld restart Shutting down MySQL.. SUCCESS! Starting MySQL. SUCCESS!三：數(shù)據(jù)庫(kù)配置主從同步

登錄數(shù)據(jù)庫(kù)

[root@master ~]# mysql

1：在所有數(shù)據(jù)庫(kù)節(jié)點(diǎn)上授權(quán)兩個(gè)用戶，一個(gè)是從庫(kù)同步使用，另外一個(gè)是 manager 使用

mysql> grant replication slave on *.* to ’myslave’@’20.0.0.%’ identified by ’123’;mysql> grant all privileges on *.* to ’mha’@’20.0.0.%’ identified by ’manager’;mysql> flush privileges;

2：下面三條授權(quán)按理論是不用添加的，但是做案例實(shí)驗(yàn)環(huán)境時(shí)候通過(guò) MHA 檢查MySQL 主從有報(bào)錯(cuò)，報(bào)兩個(gè)從庫(kù)通過(guò)主機(jī)名連接不上主庫(kù)，所以所有數(shù)據(jù)庫(kù)加上下面的授權(quán)。

mysql> grant all privileges on *.* to ’mha’@’master’ identified by ’manager’;mysql> grant all privileges on *.* to ’mha’@’slave1’ identified by ’manager’;mysql> grant all privileges on *.* to ’mha’@’slave2’ identified by ’manager’;

3：在 master 主機(jī)上查看二進(jìn)制文件和同步點(diǎn)

mysql> show master status;+-------------------+----------+--------------+------------------+-------------------+| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |+-------------------+----------+--------------+------------------+-------------------+| master-bin.000001 | 608 | | | |+-------------------+----------+--------------+------------------+-------------------+1 row in set (0.00 sec)

4：在 slave1 和 slave2 分別執(zhí)行同步

mysql> change master to master_host=’20.0.0.10’,master_user=’myslave’,master_password=’123’,master_log_file=’master-bin.000001’,master_log_pos=608mysql> start slave;

5：查看 IO 和 SQL 線程都是 yes 代表同步是否正常

mysql> show slave statusG;*************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 20.0.0.10 Master_User: myslave Master_Port: 3306 Connect_Retry: 60 Master_Log_File: master-bin.000001 Read_Master_Log_Pos: 608 Relay_Log_File: relay-log-bin.000002 Relay_Log_Pos: 284 Relay_Master_Log_File: master-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB:

必須設(shè)置兩個(gè)從庫(kù)為只讀模式

mysql> set global read_only=1;

6：在 master 主庫(kù)插入兩條數(shù)據(jù)，測(cè)試是否同步

mysql> create database test_db;Query OK, 1 row affected (0.00 sec)mysql> use test_db;Database changedmysql> create table test(id int);Query OK, 0 rows affected (0.13 sec)mysql> insert into test(id) values (1);Query OK, 1 row affected (0.03 sec)

7：在兩個(gè)從庫(kù)分別查詢?nèi)缦滤菊f(shuō)明主從同步正常

mysql> select * from test_db.test;+------+| id |+------+| 1 |+------+1 row in set (0.00 sec)四：安裝 MHA 軟件

1：所有服務(wù)器上都安裝 MHA 依賴的環(huán)境，首先安裝 epel 源（3+1）

[root@master ~]# cd /etc/yum.repos.d/[root@master yum.repos.d]# ll總用量 20drwxr-xr-x. 2 root root 187 10月 10 18:08 backup-rw-r--r--. 1 root root 1458 12月 28 23:07 CentOS7-Base-163.repo-rw-r--r--. 1 root root 951 12月 29 14:52 epel.repo-rw-r--r--. 1 root root 1050 11月 1 04:33 epel.repo.rpmnew-rw-r--r--. 1 root root 1149 11月 1 04:33 epel-testing.repo-rw-r--r--. 1 root root 228 10月 27 18:43 local.repo

三臺(tái)數(shù)據(jù)庫(kù)加上一臺(tái) mha-manager

[root@mha-manager ~]# yum install epel-release --nogpgcheck[root@mha-manager ~]# yum install -y perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-ParalExtUtils-CBuilder perl-ExtUtils-MakeMaker perl-CPAN

2：在所有服務(wù)器上必須先安裝 node 組件 （3+1）

[root@mha-manager ~]# tar zxvf mha4mysql-node-0.57.tar.gz[root@mha-manager ~]# cd mha4mysql-node-0.57[root@mha-manager mha4mysql-node-0.57]# perl Makefile.PL[root@mha-manager mha4mysql-node-0.57]# make && make install

3：在 mha-manager 上安裝 manager 組件

[root@mha-manager ~]# tar zxvf mha4mysql-manager-0.57.tar.gz [root@mha-manager ~]# cd mha4mysql-manager-0.57/[root@mha-manager mha4mysql-manager-0.57]# perl Makefile.PL[root@mha-manager mha4mysql-manager-0.57]# make && make install

manager 安裝后在/usr/local/bin 下面會(huì)生成幾個(gè)工具

masterha_check_ssh 檢查 MHA 的 SSH 配置狀況masterha_check_repl 檢查 MySQL 復(fù)制狀況masterha_manger 啟動(dòng) manager的腳本masterha_check_status 檢測(cè)當(dāng)前 MHA 運(yùn)行狀態(tài)masterha_master_monitor 檢測(cè) master 是否宕機(jī)masterha_master_switch 控制故障轉(zhuǎn)移（自動(dòng)或者手動(dòng)）masterha_conf_host 添加或刪除配置的 server 信息masterha_stop 關(guān)閉manager

node 安裝后也會(huì)在/usr/local/bin 下面會(huì)生成幾個(gè)腳本

save_binary_logs 保存和復(fù)制 master 的二進(jìn)制日志

apply_diff_relay_logs 識(shí)別差異的中繼日志事件并將其差異的事件應(yīng)用于其他的 slave

filter_mysqlbinlog 去除不必要的 ROLLBACK 事件（MHA 已不再使用這個(gè)工具）

purge_relay_logs 清除中繼日志（不會(huì)阻塞 SQL 線程）

五：配置無(wú)密碼認(rèn)證

1：在 manager 上配置到所有節(jié)點(diǎn)的無(wú)密碼認(rèn)證

（1）生成密鑰

[root@mha-manager ~]# ssh-keygen -t rsa # 一直回車

（2）生成密鑰之后發(fā)送給其他3個(gè)數(shù)據(jù)庫(kù)

[root@mha-manager ~]# ssh-copy-id 20.0.0.10 # 輸入：yes 密碼：123456[root@mha-manager ~]# ssh-copy-id 20.0.0.11[root@mha-manager ~]# ssh-copy-id 20.0.0.12

（3）登錄測(cè)試

[root@mha-manager ~]# ssh root@20.0.0.10Last login: Tue Dec 29 14:52:09 2020 from 20.0.0.1[root@master ~]# exit登出Connection to 20.0.0.10 closed.[root@mha-manager ~]# ssh root@20.0.0.11Last login: Tue Dec 29 13:20:07 2020 from 20.0.0.1[root@slave1 ~]# exit登出Connection to 20.0.0.11 closed.[root@mha-manager ~]# ssh root@20.0.0.12Last login: Tue Oct 27 19:45:24 2020 from 20.0.0.1[root@slave2 ~]# exit登出Connection to 20.0.0.12 closed.

2：在 master 上配置到數(shù)據(jù)庫(kù)節(jié)點(diǎn)的無(wú)密碼認(rèn)證

（1）生成密鑰

[root@master ~]# ssh-keygen -t rsa

（2）生成密鑰之后發(fā)送給其他2個(gè)數(shù)據(jù)庫(kù)

[root@master ~]# ssh-copy-id 20.0.0.11[root@master ~]# ssh-copy-id 20.0.0.12

（3）登錄測(cè)試

[root@master ~]# ssh root@20.0.0.11Last login: Tue Dec 29 16:40:06 2020 from 20.0.0.13[root@slave1 ~]# exit登出Connection to 20.0.0.11 closed.[root@master ~]# ssh root@20.0.0.12Last login: Tue Oct 27 23:05:20 2020 from 20.0.0.13[root@slave2 ~]# exit登出Connection to 20.0.0.12 closed.

3：在 slave1 上配置到數(shù)據(jù)庫(kù)節(jié)點(diǎn)的無(wú)密碼認(rèn)證

（1）生成密鑰

[root@slave1 ~]# ssh-keygen -t rsa

（2）生成密鑰之后發(fā)送給其他2個(gè)數(shù)據(jù)庫(kù)

[root@slave1 ~]# ssh-copy-id 20.0.0.10[root@slave1 ~]# ssh-copy-id 20.0.0.12

（3）登錄測(cè)試

[root@slave1 ~]# ssh root@20.0.0.10Last login: Tue Dec 29 16:39:55 2020 from 20.0.0.13[root@master ~]# exit登出Connection to 20.0.0.10 closed.[root@slave1 ~]# ssh root@20.0.0.12Last login: Tue Oct 27 23:14:06 2020 from 20.0.0.10[root@slave2 ~]# exit登出Connection to 20.0.0.12 closed.

4：在 slave2 上配置到數(shù)據(jù)庫(kù)節(jié)點(diǎn)的無(wú)密碼認(rèn)證

（1）生成密鑰

[root@slave2 ~]# ssh-keygen -t rsa

（2）生成密鑰之后發(fā)送給其他2個(gè)數(shù)據(jù)庫(kù)

[root@slave2 ~]# ssh-copy-id 20.0.0.10[root@slave2 ~]# ssh-copy-id 20.0.0.11

（3）登錄測(cè)試

[root@slave2 ~]# ssh root@20.0.0.10Last login: Tue Dec 29 16:59:43 2020 from 20.0.0.11[root@master ~]# exit登出Connection to 20.0.0.10 closed.[root@slave2 ~]# ssh root@20.0.0.11Last login: Tue Dec 29 16:48:51 2020 from 20.0.0.10[root@slave1 ~]# exit登出Connection to 20.0.0.11 closed.六：配置 MHA

1：在 manager 節(jié)點(diǎn)上復(fù)制相關(guān)腳本到/usr/local/bin 目錄

（1）拷貝

[root@mha-manager ~]# cp -ra /root/mha4mysql-manager-0.57/samples/scripts/ /usr/local/bin/

（2）拷貝后會(huì)有四個(gè)執(zhí)行文件

master_ip_failover #自動(dòng)切換時(shí) VIP 管理的腳本

master_ip_online_change #在線切換時(shí) vip 的管理

power_manager #故障發(fā)生后關(guān)閉主機(jī)的腳本

send_report #因故障切換后發(fā)送報(bào)警的腳本

（3）復(fù)制上述的自動(dòng)切換時(shí) VIP 管理的腳本到/usr/local/bin 目錄，這里使用腳本管理 VIP

[root@mha-manager scripts]# cp master_ip_failover /usr/local/bin/[root@mha-manager scripts]# cd ..[root@mha-manager bin]# ll總用量 88

2：修改自動(dòng)切換腳本

[root@mha-manager ~]# vi /usr/local/bin/master_ip_failover # 刪除里面所有內(nèi)容#!/usr/bin/env perluse 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);#############################添加內(nèi)容部分#########################################my $vip = ’20.0.0.200’;my $brdc = ’20.0.0.255’;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’ => $new_master_port,);exit &main();sub main {print 'nnIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===nn';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=portn';}

3：創(chuàng)建 MHA 軟件目錄并拷貝配置文件

[root@mha-manager ~]# mkdir /etc/mha[root@mha-manager ~]# cp mha4mysql-manager-0.57/samples/conf/app1.cnf /etc/mha[root@mha-manager ~]# vi /etc/mha/app1.cnf[server default]manager_workdir=/var/log/masterha/app1manager_log=/var/log/masterha/app1/manager.logmaster_binlog_dir=/usr/local/mysql/datamaster_ip_failover_script=/usr/local/bin/master_ip_failovermaster_ip_online_change_script=/usr/local/bin/master_ip_online_changepassword=manageruser=mhaping_interval=1remote_workdir=/tmprepl_password=123repl_user=myslavesecondary_check_script=/usr/local/bin/masterha_secondary_check -s 20.0.0.11 -s 20.0.0.12shutdown_script=''ssh_user=root[server1]hostname=20.0.0.10port=3306[server2]hostname=20.0.0.11port=3306candidate_master=1check_repl_delay=0[server3]hostname=20.0.0.12port=3306七：健康檢查

1：測(cè)試 ssh 無(wú)密碼認(rèn)證，如果正常最后會(huì)輸出 successfully

[root@mha-manager ~]# masterha_check_ssh--conf=<server_config_file> must be set.[root@mha-manager ~]# masterha_check_ssh --conf=/etc/mha/app1.cnfTue Dec 29 20:19:16 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.Tue Dec 29 20:19:16 2020 - [info] Reading application default configuration from /etc/mha/app1.cnf..Tue Dec 29 20:19:16 2020 - [info] Reading server configuration from /etc/mha/app1.cnf..Tue Dec 29 20:19:16 2020 - [info] Starting SSH connection tests..Tue Dec 29 20:19:17 2020 - [debug] Tue Dec 29 20:19:16 2020 - [debug] Connecting via SSH from root@20.0.0.10(20.0.0.10:22) to root@20.0.0.11(20.0.0.11:22)..Tue Dec 29 20:19:16 2020 - [debug] ok.Tue Dec 29 20:19:16 2020 - [debug] Connecting via SSH from root@20.0.0.10(20.0.0.10:22) to root@20.0.0.12(20.0.0.12:22)..Tue Dec 29 20:19:17 2020 - [debug] ok.Tue Dec 29 20:19:18 2020 - [debug] Tue Dec 29 20:19:17 2020 - [debug] Connecting via SSH from root@20.0.0.12(20.0.0.12:22) to root@20.0.0.10(20.0.0.10:22)..Tue Dec 29 20:19:17 2020 - [debug] ok.Tue Dec 29 20:19:17 2020 - [debug] Connecting via SSH from root@20.0.0.12(20.0.0.12:22) to root@20.0.0.11(20.0.0.11:22)..Tue Dec 29 20:19:18 2020 - [debug] ok.Tue Dec 29 20:19:18 2020 - [debug] Tue Dec 29 20:19:16 2020 - [debug] Connecting via SSH from root@20.0.0.11(20.0.0.11:22) to root@20.0.0.10(20.0.0.10:22)..Tue Dec 29 20:19:17 2020 - [debug] ok.Tue Dec 29 20:19:17 2020 - [debug] Connecting via SSH from root@20.0.0.11(20.0.0.11:22) to root@20.0.0.12(20.0.0.12:22)..Tue Dec 29 20:19:17 2020 - [debug] ok.Tue Dec 29 20:19:18 2020 - [info] All SSH connection tests passed successfully.

2：測(cè)試 MySQL 主從連接情況，最后出現(xiàn) MySQL Replication Health is OK 字樣說(shuō)明

[root@mha-manager ~]# masterha_check_repl --conf=/etc/mha/app1.cnfTue Dec 29 20:30:29 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.Tue Dec 29 20:30:29 2020 - [info] Reading application default configuration from /etc/mha/app1.cnf..Tue Dec 29 20:30:29 2020 - [info] Reading server configuration from /etc/mha/app1.cnf..Tue Dec 29 20:30:29 2020 - [info] MHA::MasterMonitor version 0.57.Tue Dec 29 20:30:30 2020 - [info] GTID failover mode = 0Tue Dec 29 20:30:30 2020 - [info] Dead Servers:Tue Dec 29 20:30:30 2020 - [info] Alive Servers:Tue Dec 29 20:30:30 2020 - [info] 20.0.0.10(20.0.0.10:3306)Tue Dec 29 20:30:30 2020 - [info] 20.0.0.11(20.0.0.11:3306)Tue Dec 29 20:30:30 2020 - [info] 20.0.0.12(20.0.0.12:3306)Tue Dec 29 20:30:30 2020 - [info] Alive Slaves:Tue Dec 29 20:30:30 2020 - [info] 20.0.0.11(20.0.0.11:3306) Version=5.6.36-log (oldest major version between slaves) log-bin:enabled.......省略Checking the Status of the script.. OK Tue Dec 29 20:30:55 2020 - [info] OK.Tue Dec 29 20:30:55 2020 - [warning] shutdown_script is not defined.Tue Dec 29 20:30:55 2020 - [info] Got exit code 0 (Not master dead).MySQL Replication Health is OK.八：查看 master1 的 VIP 地址

查看 20.0.0.200 是否存在

這個(gè) VIP 地址不會(huì)因?yàn)閙anager 節(jié)點(diǎn)停止 MHA 服務(wù)而消失

第一次啟動(dòng)mha，主庫(kù)上并不會(huì)主動(dòng)的生成vip地址，需要手動(dòng)開(kāi)啟

[root@master ~]# ifconfig ens33:1 20.0.0.200/24 up[root@master ~]# ip addr2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:8d:e2:af brd ff:ff:ff:ff:ff:ff inet 20.0.0.10/24 brd 20.0.0.255 scope global ens33 valid_lft forever preferred_lft forever inet 20.0.0.200/24 brd 20.0.0.255 scope global secondary ens33:1 valid_lft forever preferred_lft forever inet6 fe80::a6c1:f3d4:160:102a/64 scope link valid_lft forever preferred_lft forever九：?jiǎn)?dòng) MHA 并查看狀態(tài)

[root@mha-manager ~]# nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 &[1] 57152[root@mha-manager ~]# masterha_check_status --conf=/etc/mha/app1.cnfapp1 (pid:57152) is running(0:PING_OK), master:20.0.0.10故障模擬與修復(fù)一：故障模擬

1：將 master 主服務(wù)器 down 掉

[root@master ~]# pkill mysqld

2：查看日志信息

[root@mha-manager ~]# cat /var/log/masterha/app1/manager.logmaster 20.0.0.10(20.0.0.10:3306) is down! # 20.0.0.10 以停掉Check MHA Manager logs at mha-manager:/var/log/masterha/app1/manager.log for details.Started automated(non-interactive) failover.Invalidated master IP address on 20.0.0.10(20.0.0.10:3306)The latest slave 20.0.0.11(20.0.0.11:3306) has all relay logs for recovery.Selected 20.0.0.11(20.0.0.11:3306) as a new master. # 20.0.0.11 成為主服務(wù)器20.0.0.11(20.0.0.11:3306): OK: Applying all logs succeeded.20.0.0.11(20.0.0.11:3306): OK: Activated master IP address.20.0.0.12(20.0.0.12:3306): This host has the latest relay log events.Generating relay diff files from the latest slave succeeded.

3：查看虛擬地址

虛擬地址已到 20.0.0.11 上面

[root@slave1 ~]# ip addr2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:49:77:39 brd ff:ff:ff:ff:ff:ff inet 20.0.0.11/24 brd 20.0.0.255 scope global ens33 valid_lft forever preferred_lft forever inet 20.0.0.200/8 brd 20.255.255.255 scope global ens33:1 valid_lft forever preferred_lft forever inet6 fe80::5cbb:1621:4281:3b24/64 scope link valid_lft forever preferred_lft forever

4：查看主從狀態(tài)

查看主服務(wù)器的二進(jìn)制文件

[root@slave1 ~]# mysqlmysql> show master status;+-------------------+----------+--------------+------------------+-------------------+| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |+-------------------+----------+--------------+------------------+-------------------+| master-bin.000003 | 120 | | | |+-------------------+----------+--------------+------------------+-------------------+1 row in set (0.00 sec)

查看從2的狀態(tài)

[root@slave2 ~]# mysqlmysql> show slave statusG;*************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 20.0.0.11 Master_User: myslave Master_Port: 3306 Connect_Retry: 60 Master_Log_File: master-bin.000003 Read_Master_Log_Pos: 120 Relay_Log_File: relay-log-bin.000002 Relay_Log_Pos: 284 Relay_Master_Log_File: master-bin.000003 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: 二：故障修復(fù)

1：開(kāi)啟 down 掉的數(shù)據(jù)庫(kù)

[root@master ~]# systemctl start mysqld[root@master ~]# systemctl status mysqld● mysqld.service - LSB: start and stop MySQL Loaded: loaded (/etc/rc.d/init.d/mysqld; bad; vendor preset: disabled) Active: active (running) since 二 2020-12-29 21:50:03 CST; 25s ago Docs: man:systemd-sysv-generator(8) Process: 977 ExecStart=/etc/rc.d/init.d/mysqld start (code=exited, status=0/SUCCESS) CGroup: /system.slice/mysqld.service ├─1026 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/usr/local/mysql/data --pid-fi... └─1358 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/m

2：down 掉的數(shù)據(jù)庫(kù)進(jìn)行主從復(fù)制

主從復(fù)制

[root@master ~]# mysqlmysql> change master to master_host=’20.0.0.11’,master_user=’myslave’,master_password=’123’,master_log_file=’master-bin.000003’,master_log_pos=120; Query OK, 0 rows affected, 2 warnings (0.01 sec)# 20.0.0.11 是主服務(wù)器 down 掉之后成為的主服務(wù)器mysql> start slave;Query OK, 0 rows affected (0.01 sec)

查看狀態(tài)

mysql> show slave statusG;*************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 20.0.0.11 Master_User: myslave Master_Port: 3306 Connect_Retry: 60 Master_Log_File: master-bin.000003 Read_Master_Log_Pos: 120 Relay_Log_File: mysqld-relay-bin.000002 Relay_Log_Pos: 284 Relay_Master_Log_File: master-bin.000003 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB:

3：修改 mha 配置文件

[root@mha-manager ~]# vi /etc/mha/app1.cnfsecondary_check_script=/usr/local/bin/masterha_secondary_check -s 20.0.0.10 -s 20.0.0.12# 由于 20.0.0.11 成為主服務(wù)器，所以要添加 20.0.0.10 和 20.0.0.12 為從服務(wù)器[server1]hostname=20.0.0.10candidate_master=1check_repl_delay=0port=3306[server2]hostname=20.0.0.11port=3306# 由于 20.0.0.10 down 掉，所以 server1 文件自動(dòng)刪除，重新添加 server1，并設(shè)為備選主服務(wù)器，server2 修改

4：進(jìn)入數(shù)據(jù)庫(kù)重新授權(quán)

[root@master ~]# mysqlmysql> grant all privileges on *.* to ’mha’@’master’ identified by ’manager’;Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)

5：再次啟動(dòng) mha

[root@mha-manager ~]# nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 &[1] 58927[root@mha-manager ~]# masterha_check_status --conf=/etc/mha/app1.cnfapp1 (pid:58927) is running(0:PING_OK), master:20.0.0.11

6：再次查看日志

[root@mha-manager ~]# cat /var/log/masterha/app1/manager.log......Tue Dec 29 22:16:53 2020 - [info] Dead Servers: # 停掉的服務(wù)Tue Dec 29 22:16:53 2020 - [info] Alive Servers: # 存活的服務(wù)Tue Dec 29 22:16:53 2020 - [info] 20.0.0.10(20.0.0.10:3306)Tue Dec 29 22:16:53 2020 - [info] 20.0.0.11(20.0.0.11:3306)Tue Dec 29 22:16:53 2020 - [info] 20.0.0.12(20.0.0.12:3306).......

7：主數(shù)據(jù)庫(kù)寫(xiě)入數(shù)據(jù)同步并查看

其他數(shù)據(jù)庫(kù)都可以查到

mysql> create database ooo;Query OK, 1 row affected (0.00 sec)mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || ooo || performance_schema || test || test_db |+--------------------+6 rows in set (0.00 sec)

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