Mysql主从复制和mysql-mmm配置使用

1.实验概述

1.主机状态

hostname	function	ip	serverid
lab1.stu21.com	monitoring host	172.16.21.101	-
lab2.stu21.com	master 1	172.16.21.102	2
lab3.stu21.com	master 2	172.16.21.103	3
lab4.stu21.com	slave 1	172.16.21.104	4

2.虚拟IP:

172.16.21.200	Writer
172.16.21.201	Reader
172.16.21.202	Reader

2.Mysql主从复制配置

分别在lab2-4安装mysql-server和mysql

# yum -y install mysql-server mysql

my.cnf配置文件

[mysql]
socket=/var/lib/mysql/mysql.sock

[mysqld]
datadir=/data/mydata
socket=/var/lib/mysql/mysql.sock
user=mysql
skip_name_resolv
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Server ID
server_id = 2 #此处server_id对应第一张表中的serverid

# LogFile
log_bin             = /data/binlog/mysql-bin
relay_log           = /data/relaylog/mysql-relay

# Increment
auto_increment_increment = 2
auto_increment_offset = 1 #lab3上为2

#分别在lab2-4上进行授权

#通过MMM监视器用来检查MySQL服务器的健康
GRANT REPLICATION CLIENT                 ON *.* TO  'mmm_monitor'@'172.16.21.%' IDENTIFIED BY '123456';
#用MMM改变只读模式，复制，等等。
GRANT SUPER, REPLICATION CLIENT, PROCESS ON *.* TO 'mmm_agent'@'172.16.21.%'   IDENTIFIED BY '123456';
#用于复制
GRANT REPLICATION SLAVE                  ON *.* TO 'replication'@'172.16.21.%' IDENTIFIED BY '123456';

将数据最完整数据路上的数据进行备份,并在其他两台主机上进行恢复

#记录文件及Postion
mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 |      420 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
mysql> FLUSH TABLES WITH READ LOCK;
#新开一个终端
[root@lab2 ~]#  mysqldump -u root -p --all-databases > /tmp/database-backup.sql
[root@lab2 ~]# scp /tmp/database-backup.sql 172.16.21.103:/tmp
database-backup.sql                                100%  513KB 512.9KB/s   00:00
[root@lab2 ~]# scp /tmp/database-backup.sql 172.16.21.104:/tmp
database-backup.sql                                100%  513KB 512.9K
#恢复
[root@lab3 ~]# mysql </tmp/database-backup.sql
[root@lab4 ~]# mysql </tmp/database-backup.sql
#分别在lab3和lab4将lab2设置为主服务器
mysql> CHANGE MASTER TO master_host = '172.16.21.102', master_port=3306, master_user='replication',               master_password='123456', master_log_file='mysql-bin.000006', master_log_pos=420;
mysql>  start slave;
#在lab2上,将lab3设置为主服务器
mysql> CHANGE MASTER TO master_host = '172.16.21.103', master_port=3306, master_user='replication',               master_password='123456', master_log_file='mysql-bin.000005', master_log_pos=106;

#在lab4的配置文件中,添加只读选项并重启

read_only =ON

3.安装配置mmm

1.在monitor(lab1)安装mysql-mmm

yum install -y mysql-mmm-*

2.在lab2-alb4安扎un个mysql-mmm-agent

yum install -y mysql-mmm-agent

3.编辑通用配置文件/etc/mysql-mmm/mmm_common.conf ,并将其复制到其他所有主机

active_master_role      writer

<host default>
cluster_interface       eth0
pid_path                /var/run/mysql-mmm/mmm_agentd.pid
bin_path                /usr/libexec/mysql-mmm/
replication_user        replicantion
replication_password    123456
agent_user              mmm_agent
agent_password          123456
</host>

<host lab2>
ip      172.16.21.102
mode    master
peer    lab3
</host>

<host lab3>
ip      172.16.21.103
mode    master
peer    lab2
</host>

<host lab4>
ip      172.16.21.104
mode    slave
</host>

<role writer>
hosts   lab2,lab3
ips     172.16.21.200
mode    exclusive
</role>

<role reader>
hosts   lab3,lab4
ips     172.16.21.201,172.16.21.202
mode    balanced
</role>

#分别在lab2-lab4上编辑vim /etc/mysql-mmm/mmm_agent.conf

include mmm_common.conf

# The 'this' variable refers to this server.  Proper operation requires
# that 'this' server (db1 by default), as well as all other servers, have the
# proper IP addresses set in mmm_common.conf.
this lab3 #此处根据mmm_common.conf设置为对应hostname

#在lab2编辑监控端配置/etc/mysql-mmm/mmm_mon.conf

include mmm_common.conf

<monitor>
ip                  172.16.21.101
pid_path            /var/run/mysql-mmm/mmm_mond.pid
bin_path            /usr/libexec/mysql-mmm
status_path         /var/lib/mysql-mmm/mmm_mond.status
ping_ips            172.16.21.102,172.16.21.103,172.16.21.104
auto_set_online     60
# The kill_host_bin does not exist by default, though the monitor will
# throw a warning about it missing.  See the section 5.10 "Kill Host
# Functionality" in the PDF documentation.
#
# kill_host_bin     /usr/libexec/mysql-mmm/monitor/kill_host

</monitor>
<host default>
monitor_user        mmm_monitor
monitor_password    123456
</host>
debug 0

此时我们已经可以启动服务

#在lab1上启动监控端程序
[root@lab1 /]# service mysql-mmm-monitor start
#在lab2-lab4上分别启动代理程序
[root@lab2 /]# service mysql-mmm-agent start

#在lab1上查看后端状态,并设置为上线状态
[root@lab1 /]# mmm_control show
[root@lab1 /]# mmm_control set_online lab2
[root@lab1 /]# mmm_control set_online lab3
[root@lab1 /]# mmm_control set_online lab4
#再次查看,已经处于在线状态,且vip已经分配到各主机上
[root@lab1 /]# mmm_control show
lab2(172.16.21.102) master/ONLINE. Roles: writer(172.16.21.200)
lab3(172.16.21.103) master/ONLINE. Roles: reader(172.16.21.201)
lab4(172.16.21.104) slave/ONLINE. Roles: reader(172.16.21.202)

4.测试

通过vip访问mysql服务器,已经可以正常访问

[root@lab1 /]# mysql -h172.16.21.200 -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 12360
.......

手动将lab2下线,测试是否仍然可以访问

[root@lab2 mysql-mmm]# service mysqld stop
Stopping mysqld:                                           [  OK  ]

[root@lab1 /]# mysql -h172.16.21.200 -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7322
Server version: 5.1.71-log Source distribution