搭建 MySQL MHA

[搭建 MySQL MHA](#搭建 MySQL MHA)
- 实验拓扑图
- 实验环境
- 实验思路
- - MHA架构
  - 故障模拟
- 实验部署
- - 数据库安装
  - 主从复制部署
  - MHA搭建
  - - 安装依赖的环境
    - [安装 node 组件](#安装 node 组件)
    - [安装 manager 组件](#安装 manager 组件)
    - 配置无密码认证
    - [在 manager 节点上配置 MHA](#在 manager 节点上配置 MHA)
    - [管理 mysql 节点服务器](#管理 mysql 节点服务器)
    - - 创建相关目录
    - 编写配置文件
    - 手动开启虚拟IP
    - [测试 ssh 无密码认证及 MySQL主从连接情况](#测试 ssh 无密码认证及 MySQL主从连接情况)
    - [启动 MHA](#启动 MHA)
- [故障模拟------------ Master 节点意外故障](#故障模拟———— Master 节点意外故障)
- - [停止 Master 节点MySQL服务](#停止 Master 节点MySQL服务)
  - [查看 mysql2 是否接管 VIP](#查看 mysql2 是否接管 VIP)
  - 修复故障
  - - 启动原来的主节点
    - 修复数据
    - [在 manager 节点上修改配置文件](#在 manager 节点上修改配置文件)
    - [对mysql1和mysql2 进行重启](#对mysql1和mysql2 进行重启)
    - [在 manager 节点上启动 MHA](#在 manager 节点上启动 MHA)

搭建 MySQL MHA

实验拓扑图

实验环境

主机	IP
Master主库服务器	10.190.33.71
Slave从库服务器01	10.190.33.72
Slave从库服务器02	10.190.33.73
MHA Manager服务器	10.190.33.74
Client	10.190.33.75

实验思路

MHA架构

数据库安装
一主两从
MHA搭建

故障模拟

主库失效
备选主库成为主库
原故障主库恢复重新加入到MHA成为从库

实验部署

数据库安装

MySQL安装教程

主从复制部署

时间同步

所有服务器均需要进行配置(仅以Master服务器举例)

bash 复制代码

yum install -y chrony

vim /etc/chrony.conf 
	#注释原有ntp服务器，添加阿里ntp服务源
	server ntp.aliyun.com iburst
		
systemctl restart chronyd

chronyc sources -v

systemctl enable --now chronyd

主服务器配置

bash 复制代码

vim /etc/my.cnf
	server-id=1
	log_bin = mysql-bin
	binlog_format = mixed
	log-slave-updates = true
	relay-log = relay-log-bin
	relay-log-index = slave-relay-bin.index	

systemctl restart mysqld


mysql -u root -pAdmin@123

grant replication slave on *.* to 'myslave'@'10.190.33.%' identified by 'Admin@123';

grant all privileges on *.* to 'manager'@'10.190.33.%' identified by 'Admin@123';

grant all privileges on *.* to 'manager'@'10.190.33.71' identified by 'Admin@123';

grant all privileges on *.* to 'manager'@'10.190.33.72' identified by 'Admin@123';

grant all privileges on *.* to 'manager'@'10.190.33.73' identified by 'Admin@123';

flush privileges;


show master status;

从服务器配置

bash 复制代码

vim /etc/my.cnf
	server-id = 2
	log_bin = mysql-bin
	binlog_format = mixed
	log-slave-updates = true
	relay-log = relay-log-bin
	relay-log-index = slave-relay-bin.index

systemctl restart mysqld

mysql -u root -pAdmin@123


grant replication slave on *.* to 'myslave'@'10.190.33.%' identified by 'Admin@123';

grant all privileges on *.* to 'manager'@'10.190.33.%' identified by 'Admin@123';

grant all privileges on *.* to 'manager'@'10.190.33.71' identified by 'Admin@123';

grant all privileges on *.* to 'manager'@'10.190.33.72' identified by 'Admin@123';

grant all privileges on *.* to 'manager'@'10.190.33.73' identified by 'Admin@123';

flush privileges;

change master to master_host='10.190.33.71',master_user='myslave',master_password='Admin@123',master_log_file='mysql-bin.000001',master_log_pos=3400;

start slave;

show slave status\G

set global read_only=1;

Slave1
Slave2

创建链接

所有的数据库服务器(仅以Master服务器举例)

bash 复制代码

ln -s /usr/local/mysql/bin/mysql /usr/sbin/

ln -s /usr/local/mysql/bin/mysqlbinlog /usr/sbin/

MHA搭建

安装依赖的环境

所有的服务器(仅以Master服务器举例)

bash 复制代码

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 组件

所有的服务器(仅以Master服务器举例)

bash 复制代码

cd /opt

tar xf mha4mysql-node-0.57.tar.gz

cd mha4mysql-node-0.57

perl Makefile.PL

make && make install

安装 manager 组件

manager服务器

bash 复制代码

cd /opt

tar xf mha4mysql-manager-0.57.tar.gz

cd mha4mysql-manager-0.57

perl Makefile.PL

make && make install

配置无密码认证

所有的服务器

bash 复制代码

#manager节点上配置到所有数据库节点的无密码认证

ssh-keygen -t rsa
		
ssh-copy-id 10.190.33.71

ssh-copy-id 10.190.33.72

ssh-copy-id 10.190.33.73



#master节点上配置到数据库节点 slave1 和 slave2的无密码认证

ssh-keygen -t rsa
		
ssh-copy-id 10.190.33.72

ssh-copy-id 10.190.33.73


#slave1节点上配置到数据库节点 master和 slave2的无密码认证

ssh-keygen -t rsa
		
ssh-copy-id 10.190.33.71

ssh-copy-id 10.190.33.73


#slave2节点上配置到数据库节点 master和 slave1 的无密码认证

ssh-keygen -t rsa
		
ssh-copy-id 10.190.33.71

ssh-copy-id 10.190.33.72

manager

master

slave1

slave2

在 manager 节点上配置 MHA

bash 复制代码

cp -rp /opt/mha4mysql-manager-0.57/samples/scripts /usr/local/bin

ll /usr/local/bin/scripts/



cp /usr/local/bin/scripts/master_ip_failover /usr/local/bin


vim /usr/local/bin/master_ip_failover

	###删除所有后；拷贝前输入 :set paste 解决vim粘贴乱序问题
	
	#!/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 = '10.190.33.100';
	my $brdc = '10.190.33.255';
	my $ifdev = 'ens33';			##看下自己网卡是ens33则不用动，不是ens33就换成自己网卡名
	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";
	}

管理 mysql 节点服务器

创建相关目录

所有的服务器(仅以Master服务器举例)

bash 复制代码

mkdir -p /opt/mysql-mha/mha-node

编写配置文件

bash 复制代码

mkdir -p /opt/mysql-mha/mha-manager

vim /opt/mysql-mha/mysql_mha.cnf

	[server default]
	manager_log=/opt/mysql-mha/manager.log
	manager_workdir=/opt/mysql-mha/mha-manager
	remote_workdir=/opt/mysql-mha/mha-node
	master_binlog_dir=/usr/local/mysql/data
	ping_interval=1
	master_ip_failover_script=/usr/local/bin/master_ip_failover
	master_ip_online_change_script=/usr/local/bin/master_ip_online_change
	user=manager
	password=Admin@123
	repl_user=myslave
	repl_password=Admin@123
	port=3306
	secondary_check_script=/usr/local/bin/masterha_secondary_check -s 10.190.33.72 -s 10.190.33.73
	shutdown_script=""
	ssh_user=root
	
	[server1]
	hostname=10.190.33.71
	port=3306
	
	[server2]
	candidate_master=1
	check_repl_delay=0
	hostname=10.190.33.72
	port=3306
	
	[server3]
	hostname=10.190.33.73
	port=3306

手动开启虚拟IP

Master服务器

bash 复制代码

/sbin/ifconfig ens33:1 10.190.33.100/24

ifconfig

测试 ssh 无密码认证及 MySQL主从连接情况

bash 复制代码

masterha_check_ssh -conf=/opt/mysql-mha/mysql_mha.cnf
		#测试 ssh 无密码认证

masterha_check_repl -conf=/opt/mysql-mha/mysql_mha.cnf
		#MySQL主从连接情况

启动 MHA

bash 复制代码

nohup masterha_manager \
--conf=/opt/mysql-mha/mysql_mha.cnf \
--remove_dead_master_conf \
--ignore_last_failover < /dev/null > /var/log/mha_manager.log 2>&1 &


masterha_check_status --conf=/opt/mysql-mha/mysql_mha.cnf
		#查看 MHA 状态

cat /opt/mysql-mha/manager.log | grep "current master"
		#查看 MHA 日志

故障模拟------------ Master 节点意外故障

停止 Master 节点MySQL服务

bash 复制代码

systemctl stop mysqld

查看 mysql2 是否接管 VIP

bash 复制代码

ifconfig

修复故障

启动原来的主节点

bash 复制代码

systemctl start mysqld

修复数据

现主MySQL服务器（原从MySQL服务器1）

bash 复制代码

mysql -u root -p

mysql> show master status;

在原来的主节点

bash 复制代码

change master to master_host='10.190.33.72',master_user='myslave',master_password='Admin@123',master_log_file='mysql-bin.000001',master_log_pos=1777;

start slave;

在 manager 节点上修改配置文件

bash 复制代码

vim /opt/mysql-mha/mysql_mha.cnf
	······
	[server1]
	hostname= 10.190.33.71
	port=3306
	······

对mysql1和mysql2 进行重启

bash 复制代码

systemctl restart  mysqld

在 manager 节点上启动 MHA

bash 复制代码

masterha_stop --conf=/opt/mysql-mha/mysql_mha.cnf


nohup masterha_manager \
--conf=/opt/mysql-mha/mysql_mha.cnf \
--remove_dead_master_conf \
--ignore_last_failover < /dev/null > /var/log/mha_manager.log 2>&1 &