主从复制架构图

一、环境准备

主机名

IP

作用

db01

172.16.1.51

主节点

db02

172.16.1.52

从节点

db03

172.16.1.53

管理节点

二、主从复制搭建

1.安装数据库(所有节点)

[root@db01 ~]# yum install mariadb-server -y

[root@db02 ~]# yum install mariadb-server -y

[root@db03 ~]# yum install mariadb-server -y

2.修改各个节点的my.cnf配置文件

[root@db01 ~]# vim /etc/my.cnf

skip_name_resolve = ON

innodb_file_per_table = ON

server-id = 1

log-bin = mysql-bin

relay-log = relay-log

[root@db02 ~]# vim /etc/my.cnf

skip_name_resolve = ON

innodb_file_per_table = ON

server-id = 2

log-bin = mysql-bin

relay-log = relay-log

read_only = ON

relay_log_purge = 0

log_slave_updates = 1

[root@db03 ~]# vim /etc/my.cnf

skip_name_resolve = ON

innodb_file_per_table = ON

server-id = 3

log-bin = mysql-bin

relay-log = relay-log

read_only = ON

relay_log_purge = 0

log_slave_updates = 1

3.所有节点重启数据库服务

[root@db01 ~]# systemctl restart mariadb

[root@db02 ~]# systemctl restart mariadb

[root@db03 ~]# systemctl restart mariadb

4.所有节点建立slave用户

[root@db01 ~]# mysql

MariaDB [(none)]> grant replication slave on *.* to 'slave'@'172.16.1.%' identified by '123456';

[root@db02 ~]# mysql

MariaDB [(none)]> grant replication slave on *.* to 'slave'@'172.16.1.%' identified by '123456';

[root@db03 ~]# mysql

MariaDB [(none)]> grant replication slave on *.* to 'slave'@'172.16.1.%' identified by '123456';

5.查看主节点的状态(并记住File和Position 的值)

[root@db01 ~]# mysql

MariaDB [(none)]> show master status;

+------------------+----------+--------------+------------------+

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |

+------------------+----------+--------------+------------------+

| mysql-bin.000003 | 397 | | |

+------------------+----------+--------------+------------------+

1 row in set (0.00 sec)

6.从节点连接主节点(只需要在db02和db03分别操作)

MariaDB [(none)]> set global read_only=1;

Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> change master to

-> master_host='172.16.1.51',

-> master_user='slave',

-> master_password='123456',

-> master_log_file='mysql-bin.000003',

-> master_log_pos=397;

Query OK, 0 rows affected (0.06 sec)

7.打开从节点(只需要在db02和db03分别操作)

MariaDB [(none)]> start slave;

Query OK, 0 rows affected (0.00 sec)

8.查看两个从节点(下面两个参数为Yes则主从复制成功)

MariaDB [(none)]> show slave status\G

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

三、配置MHA

1.主节点建立mha用户

[root@db01 ~]# mysql

MariaDB [(none)]> grant all on *.* to 'mha'@'172.16.1.%' identified by 'mha';

2.如果主从复制成功，另外两个节点则有mha用户

MariaDB [(none)]> select user,host from mysql.user;

3.三台节点实现相互免密连接脚本

三台机器分别运行这个脚本即可实现相互免密连接。

#!/bin/bash

. /etc/rc.d/init.d/functions

yum install sshpass -y >/dev/null

# 创建密钥

\rm ~/.ssh/id_rsa* -f

ssh-keygen -t rsa -f ~/.ssh/id_rsa -N "" -q

# 分发公钥

for ip in 51 52 53

do

sshpass -p1 ssh-copy-id -o "StrictHostKeyChecking no" -i /root/.ssh/id_rsa.pub 172.16.1.$ip &>/dev/null

if [ $? -eq 0 ];then

action "服务器:172.16.1.$ip 密钥分发成功" /bin/true

else

action "未检测到172.16.1.$ip服务器，快去检查一下吧！" /bin/false

fi

done

4.所有节点安装mha-node的rpm包

yum install -y perl perl-DBI perl-DBD-MySQL perl-IO-Socket-SSL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiRes

rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm

Preparing... ################################# [100%]

Updating / installing...

1:mha4mysql-node-0.56-0.el6 ################################# [100%]

5.管理节点安装manager-rpm包

[root@db03 ~]# ll

total 128

-rw-r--r-- 1 root root 87119 Apr 3 12:08 mha4mysql-manager-0.56-0.el6.noarch.rpm

-rw-r--r-- 1 root root 36326 Apr 3 12:08 mha4mysql-node-0.56-0.el6.noarch.rpm

-rw-r--r-- 1 root root 480 Apr 6 19:07 test.sh

[root@db03 ~]# rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm

Preparing... ################################# [100%]

Updating / installing...

1:mha4mysql-manager-0.56-0.el6 ################################# [100%]

6.管理节点创建mha目录及脚本目录

[root@db03 ~]# mkdir -p /etc/mha/scripts

[root@db03 ~]# mkdir -p /var/log/mha/app1

7.管理节点编写mha配置文件

[root@db03 ~]# vim /etc/mha/app1.cnf

[server default]

manager_log=/var/log/mha/app1/manager.log

manager_workdir=/var/log/mha/app1

master_binlog_dir=/var/lib/mysql

master_ip_failover_script= /etc/mha/scripts/master_ip_failover

master_ip_online_change_script=/etc/mha/scripts/master_ip_online_change

user=mha

password=mha

ssh_user=root

repl_password=123456

repl_user=slave

ping_interval=1

[server1]

hostname=172.16.1.51

port=3306

[server2]

hostname=172.16.1.52

port=3306

candidate_master=1

check_repl_delay=0

[server3]

hostname=172.16.1.53

port=3306

8.配置VIP漂移

编写master_ip_failover脚本

[root@db03 ~]# vim /etc/mha/scripts/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 = '172.16.1.50/24';

my $key = '1';

my $ssh_start_vip = "/sbin/ifconfig eth1:$key $vip";

my $ssh_stop_vip = "/sbin/ifconfig eth1:$key down";

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 \"`;

}

sub stop_vip() {

return 0 unless ($ssh_user);

`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";

}

编写master_ip_online_change脚本

[root@db03 ~]# vim /etc/mha/scripts/master_ip_online_change

#!/bin/bash

source /root/.bash_profile

vip=`echo '172.16.1.50/24'` #设置VIP

key=`echo '1'`

command=`echo "$1" | awk -F = '{print $2}'`

orig_master_host=`echo "$2" | awk -F = '{print $2}'`

new_master_host=`echo "$7" | awk -F = '{print $2}'`

orig_master_ssh_user=`echo "${12}" | awk -F = '{print $2}'`

new_master_ssh_user=`echo "${13}" | awk -F = '{print $2}'`

#要求服务的网卡识别名一样，都为eth1(这里是)

stop_vip=`echo "ssh root@$orig_master_host /usr/sbin/ifconfig eth1:$key down"`

start_vip=`echo "ssh root@$new_master_host /usr/sbin/ifconfig eth1:$key $vip"`

if [ $command = 'stop' ]

then

echo -e "\n\n\n****************************\n"

echo -e "Disabled thi VIP - $vip on old master: $orig_master_host \n"

$stop_vip

if [ $? -eq 0 ]

then

echo "Disabled the VIP successfully"

else

echo "Disabled the VIP failed"

fi

echo -e "***************************\n\n\n"

fi

if [ $command = 'start' -o $command = 'status' ]

then

echo -e "\n\n\n*************************\n"

echo -e "Enabling the VIP - $vip on new master: $new_master_host \n"

$start_vip

if [ $? -eq 0 ]

then

echo "Enabled the VIP successfully"

else

echo "Enabled the VIP failed"

fi

echo -e "***************************\n\n\n"

fi

9.授权脚本

[root@db03 ~]# chmod +x /etc/mha/scripts/master_ip_failover

[root@db03 ~]# chmod +x /etc/mha/scripts/master_ip_online_change

10.管理节点测试ssh信任是否连接(successfully则成功)

[root@db03 ~]# masterha_check_ssh --conf=/etc/mha/app1.cnf

Mon Apr 6 19:51:09 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.

Mon Apr 6 19:51:09 2020 - [info] Reading application default configuration from /etc/mha/app1.cnf..

Mon Apr 6 19:51:09 2020 - [info] Reading server configuration from /etc/mha/app1.cnf..

Mon Apr 6 19:51:09 2020 - [info] Starting SSH connection tests..

......

......

......

Mon Apr 6 19:51:11 2020 - [debug] ok.

Mon Apr 6 19:51:12 2020 - [info] All SSH connection tests passed successfully.

11.管理节点验证主从复制是否成功(is OK 则成功)

[root@db03 ~]# masterha_check_repl --conf=/etc/mha/app1.cnf

Mon Apr 6 19:51:41 2020 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.

Mon Apr 6 19:51:41 2020 - [info] Reading application default configuration from /etc/mha/app1.cnf..

Mon Apr 6 19:51:41 2020 - [info] Reading server configuration from /etc/mha/app1.cnf..

Mon Apr 6 19:51:41 2020 - [info] MHA::MasterMonitor version 0.56.

......

......

......

Mon Apr 6 19:51:47 2020 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.

12.主节点绑定网卡

[root@db01 ~]# ifconfig eth1:1 172.16.1.50/24

13.在管理节点上启动mha

[root@db03 ~]# masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log 2>&1

14.主节点ifconfig查看网卡状态(发现多了个eth1:1)

此时，关闭主节点的数据库(模拟主节点数据库炸了)

[root@db01 ~]# systemctl stop mariadb

到从节点(db02主机)查看eth1:1已经漂移到这个节点上了

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