MySQL 搭建MHA架构部署的步骤

mah

一：mah架构介绍

• 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，它由日本人youshimaton开发，是一套优秀的作为mysql高可用性环境下故障切换和主从提升的高可用软件。在mysql故障切换过程中，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由两部分组成:mha manager (管理节点)和mhanode(数据节点)。mha manager可以独立部署在一*立的机器上管理多个master-slave集群，也可以部署在一台slave上。当master 出现故障是，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是完全透明的。

二：适用场景

目前mha主要支持一主多从的架构，要搭建mha，要求一个复制集群必须最少有3台数据库服务器，一主二从，即一台充当master ,一台充当备用master，另一台充当从库。出于成本考虑，淘宝在此基础上进行了改造，目前淘宝开发的 tmha 已经支持一主一从。

三：mha工作原理

1.从宕机崩溃的 master保存二进制日志事件(binlog event) ;

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;

5.提升—个 slave为新的master;

6.使其他的 slave 连接新的 master 进行复制;

四：mha的组成

•  manager工具包
• node工具包

1：manager工具包

• masterha_check_ssh:检查mha的 ssh配置情况
• masterha_check_repl:检查mysql复制状况
• masterha_manager:启动mha
• masterha_check_status:检测当前mha运行状态
• masterha_master_monitor:检测master是否宕机
• masterha_master_switch:控制故障转移(自动或手动)
• masterha_conf_host:添加或删除配置的server 信息

2：node工具包

通常由mha manager的脚本触发，无需人工操作

• save_binary_logs:保存和复制master 的 binlog日志
• apply_diff_relay_logs:识别差异的中级日志时间并将其应用到其他 slave
• filter_mysqlbinlog:去除不必要的roolback事件（已经废弃)
• purge_relay_logs:清除中继日志（不阻塞sql线程)

五：mha 特点

• 自动故障切换过程中，mha试图从宕机的主服务器上保存进制日志,最大程度的保证数据不丢失
• 使用半同步复制，可以大大降低数据丢失的风险
• 目前mha支持一主多从架构，最少三台服务，即一主两从

mha 架构部署

一：拓扑图

二：数据库安装

mysql 版本使用 5.6.36、cmake 版本使用 2.8.6

1：安装编译依赖的环境

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

2.：安装 gmake 编译软件

[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：安装 mysql 数据库

[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/profile
chown -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

将原来配置全部删除

[root@master ~]# vi /etc/my.cnf
[client]
port = 3306
socket = /usr/local/mysql/mysql.sock

[mysql]
port = 3306
socket = /usr/local/mysql/mysql.sock

[mysqld]
user = mysql
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
port = 3306
pid-file = /usr/local/mysql/mysqld.pid
socket = /usr/local/mysql/mysql.sock
server-id = 1
log_bin = master-bin
log-slave-updates = true

sql_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

另外两台 slave 数据库

三台服务器的 server-id 不能一样，其余一样正常写入

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

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

5：三台数据库分别做两个软链接，软链接是为 hma 服务的

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

6：三台数据库启动 mysql

[root@master ~]# /usr/local/mysql/bin/mysqld_safe --user=mysql &
[root@master ~]# service mysqld restart 
shutting down mysql.. success! 
starting mysql. success!

三：数据库配置主从同步

登录数据库

[root@master ~]# mysql

1：在所有数据库节点上授权两个用户，一个是从库同步使用，另外一个是 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：下面三条授权按理论是不用添加的，但是做案例实验环境时候通过 mha 检查mysql 主从有报错，报两个从库通过主机名连接不上主库，所以所有数据库加上下面的授权。

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 主机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 |  608 |    |     |     |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

4：在 slave1 和 slave2 分别执行同步

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=608
mysql> start slave;

5：查看 io 和 sql 线程都是 yes 代表同步是否正常

mysql> show slave status\g;
*************************** 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: 

必须设置两个从库为只读模式

mysql> set global read_only=1;

6：在 master 主库插入两条数据，测试是否同步

mysql> create database test_db;
query ok, 1 row affected (0.00 sec)
mysql> use test_db;
database changed
mysql> 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：在两个从库分别查询如下所示说明主从同步正常

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

四：安装 mha 软件

1：所有服务器上都安装 mha 依赖的环境，首先安装 epel 源（3+1）

[root@master ~]# cd /etc/yum.repos.d/
[root@master yum.repos.d]# ll
总用量 20
drwxr-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

三台数据库加上一台 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：在所有服务器上必须先安装 node 组件 （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 上安装 manager 组件

[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 安装后在/usr/local/bin 下面会生成几个工具

masterha_check_ssh 检查 mha 的 ssh 配置状况
masterha_check_repl 检查 mysql 复制状况
masterha_manger 启动 manager的脚本
masterha_check_status 检测当前 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

node 安装后也会在/usr/local/bin 下面会生成几个脚本

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）

五：配置无密码认证

1：在 manager 上配置到所有节点的无密码认证

（1）生成密钥

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

（2）生成密钥之后发送给其他3个数据库

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

（3）登录测试

[root@mha-manager ~]# ssh root@20.0.0.10
last 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@20.0.0.11
last 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@20.0.0.12
last 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 上配置到数据库节点的无密码认证

（1）生成密钥

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

（2）生成密钥之后发送给其他2个数据库

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

（3）登录测试

[root@master ~]# ssh root@20.0.0.11
last 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@20.0.0.12
last 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 上配置到数据库节点的无密码认证

（1）生成密钥

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

（2）生成密钥之后发送给其他2个数据库

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

（3）登录测试

[root@slave1 ~]# ssh root@20.0.0.10
last 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@20.0.0.12
last 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 上配置到数据库节点的无密码认证

（1）生成密钥

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

（2）生成密钥之后发送给其他2个数据库

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

（3）登录测试

[root@slave2 ~]# ssh root@20.0.0.10
last 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@20.0.0.11
last 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 节点上复制相关脚本到/usr/local/bin 目录

（1）拷贝

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

（2）拷贝后会有四个执行文件

master_ip_failover #自动切换时 vip 管理的脚本

master_ip_online_change #在线切换时 vip 的管理

power_manager #故障发生后关闭主机的脚本

send_report #因故障切换后发送报警的脚本

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

2：修改自动切换脚本

[root@mha-manager ~]# vi /usr/local/bin/master_ip_failover  # 删除里面所有内容
#!/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
);
#############################添加内容部分#########################################
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 "\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_master
sub 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：创建 mha 软件目录并拷贝配置文件

[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/app1
manager_log=/var/log/masterha/app1/manager.log
master_binlog_dir=/usr/local/mysql/data
master_ip_failover_script=/usr/local/bin/master_ip_failover
master_ip_online_change_script=/usr/local/bin/master_ip_online_change
password=manager
user=mha
ping_interval=1
remote_workdir=/tmp
repl_password=123
repl_user=myslave
secondary_check_script=/usr/local/bin/masterha_secondary_check -s 20.0.0.11 -s 20.0.0.12
shutdown_script=""
ssh_user=root

[server1]
hostname=20.0.0.10
port=3306
[server2]
hostname=20.0.0.11
port=3306
candidate_master=1
check_repl_delay=0
[server3]
hostname=20.0.0.12
port=3306

七：健康检查

1：测试 ssh 无密码认证，如果正常最后会输出 successfully

[root@mha-manager ~]# masterha_check_ssh
--conf=<server_config_file> must be set.
[root@mha-manager ~]# masterha_check_ssh --conf=/etc/mha/app1.cnf
tue 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：测试 mysql 主从连接情况，最后出现 mysql replication health is ok 字样说明

[root@mha-manager ~]# masterha_check_repl --conf=/etc/mha/app1.cnf
tue 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 = 0
tue 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

这个 vip 地址不会因为manager 节点停止 mha 服务而消失

第一次启动mha，主库上并不会主动的生成vip地址，需要手动开启

[root@master ~]# ifconfig ens33:1 20.0.0.200/24 up
[root@master ~]# ip addr
2: 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：启动 mha 并查看状态

[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.cnf
app1 (pid:57152) is running(0:ping_ok), master:20.0.0.10

故障模拟与修复

一：故障模拟

1：将 master 主服务器 down 掉

[root@master ~]# pkill mysqld

2：查看日志信息

[root@mha-manager ~]# cat /var/log/masterha/app1/manager.log

master 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 成为主服务器
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：查看虚拟地址

虚拟地址已到 20.0.0.11 上面

[root@slave1 ~]# ip addr
2: 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：查看主从状态

查看主服务器的二进制文件

[root@slave1 ~]# mysql

mysql> 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)

查看从2的状态

[root@slave2 ~]# mysql

mysql> show slave status\g;
*************************** 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：故障修复

1：开启 down 掉的数据库

[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 掉的数据库进行主从复制

主从复制

[root@master ~]# mysql

mysql> 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 是主服务器 down 掉之后成为的主服务器

mysql> start slave;
query ok, 0 rows affected (0.01 sec)

查看状态

mysql> show slave status\g;
*************************** 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.cnf

secondary_check_script=/usr/local/bin/masterha_secondary_check -s 20.0.0.10 -s 20.0.0.12
# 由于 20.0.0.11 成为主服务器，所以要添加 20.0.0.10 和 20.0.0.12 为从服务器
[server1]
hostname=20.0.0.10
candidate_master=1
check_repl_delay=0
port=3306
[server2]
hostname=20.0.0.11
port=3306
# 由于 20.0.0.10 down 掉，所以 server1 文件自动删除，重新添加 server1，并设为备选主服务器，server2 修改

4：进入数据库重新授权

[root@master ~]# mysql

mysql> 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：再次启动 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.cnf
app1 (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:  # 停掉的服务
tue dec 29 22:16:53 2020 - [info] alive servers:  # 存活的服务
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：主数据库写入数据同步并查看

其他数据库都可以查到

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)

到此这篇关于mysql 搭建mha架构部署的步骤的文章就介绍到这了,更多相关mysql 搭建mha架构部署内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！