MySQL—MMM高可用羣集的搭建(全過程,純乾貨~~)

本篇文章主要介紹搭建MMM方案以及MMM架構的原理。MMM方案不適用對數據一致性要求很高的業務。下面一起來學習學習。

先來看看具體的架構拓撲,如下:

MySQL—MMM高可用羣集的搭建(全過程,純乾貨~~)

其中,

角色 Hosts IP地址 應用屬性 VIP
master1 master 192.168.142.135 write 192.168.142.188
master2 backup 192.168.142.132 write|read 192.168.142.188
slave1 slave 192.168.142.136 read 192.168.142.200, 192.168.142.210
slave2 slave 192.168.142.137 read 192.168.142.200, 192.168.142.210
monitor monitor 192.168.142.143 moitor 無VIP

具體配置步驟

一、實驗環境配置

配置ALI雲源(若已安裝可跳過)

這裏以master1作示範,實際五臺均需要安裝

[root@master1 ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
[root@master1 ~]# yum -y install epel-release
[root@master1 ~]# yum clean all && yum makecache

給所有主從服務器安裝MySQL,並配置

[root@master1 ~]# yum install mysql -y
[root@master1 ~]# vim /etc/my.cnf      #修改配置文件
    ##server id不能一樣
    server-id =
    log-bin = zhu-bin
    log-slave-updates = ture    ##開啓主從同步
    sync_binlog = 1   ##二進制文件立即寫入
    auto_increment_increment=2           ###增量爲2   
    auto_increment_offset=1               ######  起始值爲1
[root@master1 ~]# systemctl restart mysqld
[root@master1 ~]# systemctl enable mysqld

二、配置主主同步(兩個主服務器相互複製,互相平級)

m1給m2從權限,m2給m1從權限

[root@master1 ~]# mysql -u root -p
grant replication slave on *.* to 'myslave'@'192.168.142.%' identified by 'asd123';
    #允許從服務器使用myslave賬戶在主服務器上進行復制操作(兩臺主均要授權)
show master status;
+------------------+----------+--------------+--------------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB         |
+------------------+----------+--------------+--------------------------+
| mysql_bin.000001 |      245 |              | mysql,information_schema |
+------------------+----------+--------------+--------------------------+
1 row in set (0.00 sec)
    #查看作爲主服務器的信息,關鍵點爲position號碼
change master to master_host='主服務器地址',master_user='myslave',master_password='asd123',master_log_file='File',master_log_pos=position號碼;
    ##授予權限(m1爲m2的主,m2爲m1的主)
start slave;
show slave status\G
    Slave_IO_Running: Yes
    Slave_SQL_Running: Yes
    #查看作爲從服務器的信息,是否同步開啓

三、進行主從同步(兩臺從指一臺同一臺主)

配置兩臺從服務器指向master1

[root@slave1 ~]# vim /etc/my.cnf
    server-id = 6    #不能有相同的
    log-bin=mysql-bin
    log-slave-updates=ture
    sync_binlog = 1
[root@slave1 ~]# systemctl restart mysqld
[root@slave1 ~]# netstat -atnp | grep 3306
tcp6       0      0 :::3306                 :::*                    LISTEN      38831/mysqld

#提權,指向master1(兩臺從操作相同!!!!!)
[root@slave1 ~]# mysql -uroot -p
change master to master_host='主服務器地址',master_user='myslave',master_password='asd123',master_log_file='主服務器查看到的信息',master_log_pos=號碼;
    ##授予權限(slave1、slave2爲master1的從)
start slave;
show slave status\G
    Slave_IO_Running: Yes
    Slave_SQL_Running: Yes
    #查看作爲從服務器的信息,是否同步開啓

四、所有服務器安裝並配置MMM

修改mmm_common配置文件

[root@master1 ~]# yum -y install mysql-mmm*

#修改MMM配置文件
[root@master1 ~]# vim /etc/mysql-mmm/mmm_common.conf
cluster_interface       ens33
......
replication_user        myslave     #從服務器訪問主服務器賬戶
replication_password    asd123
agent_user              mmm_user    #MMM用戶賬戶
agent_password          123123

<host db1>
    ip      192.168.142.135        #master1的IP地址
    mode    master
    peer    db2
</host>

<host db2>
    ip      192.168.142.132        #master2的IP地址
    mode    master
    peer    db1
</host>

<host db3>
    ip      192.168.142.136        #slave1的IP地址
    mode    slave
</host>

<host db4>
    ip      192.168.142.137        #slave2的IP地址
    mode    slave
</host>

<role writer>
    hosts   db1, db2
    ips     192.168.142.188       ###VIP虛擬IP地址
    mode    exclusive
</role>

<role reader>
    hosts   db3, db4
    ips     192.168.142.200, 192.168.142.210      ###VIP虛擬IP地址
    mode    balanced
</role>

#scp遠程複製,將配置遠程推送
[root@master1 ~]# scp /etc/mysql-mmm/mmm_common.conf [email protected]:/etc/mysql-mmm/
[root@master1 ~]# scp /etc/mysql-mmm/mmm_common.conf [email protected]:/etc/mysql-mmm/
[root@master1 ~]# scp /etc/mysql-mmm/mmm_common.conf [email protected]:/etc/mysql-mmm/
[root@master1 ~]# scp /etc/mysql-mmm/mmm_common.conf [email protected]:/etc/mysql-mmm/

修改mmm_monitor配置文件(僅monitor監聽端)

[root@localhost ~]# vim /etc/mysql-mmm/mmm_mon.conf
<monitor>
    ......
    ping_ips            192.168.142.135,192.168.142.132,192.168.142.136,192.168.142.137     #所有主從服務器IP地址
    auto_set_online     5
    #等待上線時間

<host default>
    monitor_user        mmm_monitor     ##創建監控用戶
    monitor_password    123123
</host>

在所有主從數據庫中(MMM用戶、監控用戶)進行提權

[root@master1 ~]# mysql -u root -p
grant super,replication client,process on *.* to 'mmm_user'@'192.168.142.%' identified by '123123';
grant replication client on *.* to 'mmm_monitor'@'192.168.142.%' identified by '123123';
flush privileges
##每臺主從都要提權

修改agant配置文件(每臺主從都要修改)

位置:/etc/mysql-mmm/mmm_agent.conf

[root@master1 ~]# vim /etc/mysql-mmm/mmm_agent.conf
this db1(對應的角色)

五、開啓服務

所有主從服務器開啓mmm_agant服務

[root@master1 ~]# systemctl start mysql-mmm-agent.service 
[root@master1 ~]# systemctl enable mysql-mmm-agent.service 

監控端開啓mmm_monitor服務

[root@localhost ~]# systemctl stop firewalld.service 
[root@localhost ~]# setenforce 0
[root@localhost ~]# systemctl start mysql-mmm-monitor.service
[root@localhost ~]# mmm_control show   ##查看監控狀態

六、驗證結果

[root@localhost mysql-mmm]# mmm_control show
  db1(192.168.142.135) master/ONLINE. Roles: writer(192.168.18.250)
  db2(192.168.142.132) master/ONLINE. Roles: 
  db3(192.168.142.136) slave/ONLINE. Roles: reader(192.168.18.251)
  db4(192.168.142.137) slave/ONLINE. Roles: reader(192.168.18.252)

//利用命令調整虛擬IP切換至master2:
[root@localhost mysql-mmm]# mmm_control move_role writer db2
OK: Role 'writer' has been moved from 'db1' to 'db2'. Now you can wait some time and check new roles info!
[root@localhost mysql-mmm]# mmm_control show
  db1(192.168.142.135) master/ONLINE. Roles: 
  db2(192.168.142.132) master/ONLINE. Roles: writer(192.168.18.250)
  db3(192.168.142.136) slave/ONLINE. Roles: reader(192.168.18.251)
  db4(192.168.142.137) slave/ONLINE. Roles: reader(192.168.18.252)

//檢測所有狀態是否都正常:
[root@localhost mysql-mmm]# mmm_control checks all
db4  ping         [last change: 2019/11/25 15:25:54]  OK
db4  mysql        [last change: 2019/11/25 15:25:54]  OK
db4  rep_threads  [last change: 2019/11/25 15:25:54]  OK
db4  rep_backlog  [last change: 2019/11/25 15:25:54]  OK: Backlog is null
db2  ping         [last change: 2019/11/25 15:25:54]  OK
db2  mysql        [last change: 2019/11/25 15:25:54]  OK
db2  rep_threads  [last change: 2019/11/25 15:25:54]  OK
db2  rep_backlog  [last change: 2019/11/25 15:25:54]  OK: Backlog is null
db3  ping         [last change: 2019/11/25 15:25:54]  OK
db3  mysql        [last change: 2019/11/25 15:25:54]  OK
db3  rep_threads  [last change: 2019/11/25 15:25:54]  OK
db3  rep_backlog  [last change: 2019/11/25 15:25:54]  OK: Backlog is null
db1  ping         [last change: 2019/11/25 15:25:54]  OK
db1  mysql        [last change: 2019/11/25 15:25:54]  OK
db1  rep_threads  [last change: 2019/11/25 15:25:54]  OK
db1  rep_backlog  [last change: 2019/11/25 15:25:54]  OK: Backlog is null

以上就是MMM羣集搭建的全過程,感謝閱讀!!

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