About MMM
MMM (Master-Master replication manager for MySQL) is a set of master failover support for dual dual master script and daily management. MMM use Perl language development, is mainly used to monitor and manage MySQL Master-Master (double master) copy, it can be said to mysql master-master replication manager. Although called a dual-master replication, but on the same time services allow only one master write, to provide services on another portion of the read main Alternatively, to accelerate the switching of the main preheating time in the main main Alternatively, it can be said that MMM set of scripts on the one hand to achieve a failover capabilities, on the other hand inside additional tool scripts can also be achieved read load balancing of multiple slave. About mysql master-master replication configuration monitoring, failover and management of a scalable suite script (only one node can be written at any time), the kit can also be from any number of configurations from the standard of living in the home read server load balancing, so you can use it to a group of servers in virtual ip start living copy, in addition, it has achieved a script re-synchronization of backup data between the nodes.
MMM provides automatic and manual modes removal of a copy set of high latency server virtual IP server, while it can backup data, data synchronization between the two nodes. Since the MMM can not completely guarantee data consistency, the consistency MMM apply to the data requirements is not very high, but want to ensure the greatest degree of service availability scenarios. MySQL itself does not provide replication failover solutions, through MMM scheme can failover server in order to achieve high availability mysql. For those high consistency of the data requirements of the business, so this is not recommended MMM highly available architecture.
lab environment
主服务器1：192.168.52.135 db1 writer VIP：192.168.52.200
主服务器2：192.168.52.133 db2
从服务器1：192.168.52.134 db3 reader VIP：192.168.52.210,192.168.52.220
从服务器2：192.168.52.148 db4
监控服务器：192.168.52.150Experimental operation
First, were installed mariadb service on four MySQL servers
1, to configure the local yum source (four operations on the same server, respectively)
[root@localhost ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
#配置aliyun源
--2019-11-25 09:51:39-- http://mirrors.aliyun.com/repo/Centos-7.repo
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 124.14.2.219, 124.14.2.218, 124.14.2.234, ...
正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|124.14.2.219|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：2523 (2.5K) [application/octet-stream]
正在保存至: “/etc/yum.repos.d/CentOS-Base.repo”
100%[====================================================================================>] 2,523 --.-K/s 用时 0s
2019-11-25 09:51:39 (225 MB/s) - 已保存 “/etc/yum.repos.d/CentOS-Base.repo” [2523/2523])
[root@localhost ~]# yum -y install epel-release #安装epel-release源
.......................//省略过程
[root@localhost ~]# yum clean all && yum makecache #清除缓存旧的缓存，同步现在服务器的缓存
........................//省略过程2, mounting MariaDB (MySQL one kind of service) service on the primary server 1
[root@localhost ~]# hostnamectl set-hostname db1 #修改主机名
[root@localhost ~]# su #切换bash环境
[root@db1 ~]#
[root@db1 ~]# yum install mariadb-server mariadb -y #安装服务
....................//省略过程
[root@db1 ~]# vim /etc/my.cnf #修改配置文件
[mysqld]
log_error=/var/lib/mysql/mysql.err
log=/var/lib/mysql/mysql_log.log
log_slow_queries=/var/lib/mysql_slow_queris.log
binlog-ignore-db=mysql,information_schema
character_set_server=utf8
log_bin=mysql_bin
server_id=1
log_slave_updates=true
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1
[root@db1 ~]# systemctl stop firewalld.service #关闭防火墙
[root@db1 ~]# setenforce 0 #关闭增强性安全功能
[root@db1 ~]# systemctl start mariadb.service #开启服务
[root@db1 ~]# netstat -ntap | grep 3306 #查看端口
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 4601/mysqld
[root@db1 ~]#3, installed on the primary server service mariadb 2
[root@localhost ~]# hostnamectl set-hostname db2
[root@localhost ~]# su
[root@db2 ~]#
[root@db2 ~]# yum install mariadb-server mariadb -y
[root@db2 ~]# vim /etc/my.cnf
[mysqld]
log_error=/var/lib/mysql/mysql.err
log=/var/lib/mysql/mysql_log.log
log_slow_queries=/var/lib/mysql_slow_queris.log
binlog-ignore-db=mysql,information_schema
character_set_server=utf8
log_bin=mysql_bin
server_id=2
log_slave_updates=true
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1
[root@db2 ~]# systemctl stop firewalld.service
[root@db2 ~]# setenforce 0
[root@db2 ~]# systemctl start mariadb.service
[root@db2 ~]# netstat -ntap | grep 3306
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 50643/mysqld
[root@db2 ~]# 4, the installation from the server 1 mariadb Service
[root@localhost ~]# hostnamectl set-hostname db3
[root@localhost ~]# su
[root@db3 ~]#
[root@db3 ~]# yum install mariadb-server mariadb -y
[root@db3 ~]# vim /etc/my.cnf
[mysqld]
log_error=/var/lib/mysql/mysql.err
log=/var/lib/mysql/mysql_log.log
log_slow_queries=/var/lib/mysql_slow_queris.log
binlog-ignore-db=mysql,information_schema
character_set_server=utf8
log_bin=mysql_bin
server_id=11
log_slave_updates=true
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1
[root@db3 ~]# systemctl stop firewalld.service
[root@db3 ~]# setenforce 0
[root@db3 ~]# systemctl start mariadb.service
[root@db3 ~]# netstat -ntap | grep 3306
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 50578/mysqld
[root@db3 ~]#5, the installation from the server 2 mariadb service
[root@localhost ~]# hostnamectl set-hostname db4
[root@localhost ~]# su
[root@db4 ~]#
[root@db4 ~]# yum install mariadb-server mariadb -y
[root@db4 ~]# vim /etc/my.cnf
[mysqld]
log_error=/var/lib/mysql/mysql.err
log=/var/lib/mysql/mysql_log.log
log_slow_queries=/var/lib/mysql_slow_queris.log
binlog-ignore-db=mysql,information_schema
character_set_server=utf8
log_bin=mysql_bin
server_id=22
log_slave_updates=true
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1
[root@db4 ~]# systemctl stop firewalld.service
[root@db4 ~]# setenforce 0
[root@db4 ~]# systemctl start mariadb.service
[root@db4 ~]# netstat -ntap | grep 3306
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 39804/mysqld
[root@db4 ~]# Second, the configuration from a multi-mode multi-master MySQL
1, each master server log_bin Location pos values and log 1 and the main server 2
主服务器1：
[root@db1 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show master status; #查看状态
+------------------+----------+--------------+--------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+--------------------------+
| mysql_bin.000003 | 245 | | mysql,information_schema |
+------------------+----------+--------------+--------------------------+
1 row in set (0.00 sec)主服务器2：
[root@db2 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show master status; #查看状态
+------------------+----------+--------------+--------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+--------------------------+
| mysql_bin.000003 | 245 | | mysql,information_schema |
+------------------+----------+--------------+--------------------------+
1 row in set (0.00 sec)2, the main server 1 and the main server 2 to enhance access to each other
主服务器1：
MariaDB [(none)]> grant replication slave on *.* to 'replication'@'192.168.52.%' identified by '123456';
#提权
Query OK, 0 rows affected (0.01 sec)
主服务器2：
MariaDB [(none)]> grant replication slave on *.* to 'replication'@'192.168.52.%' identified by '123456';
#提权
Query OK, 0 rows affected (0.01 sec)主服务器1：
MariaDB [(none)]> change master to master_host='192.168.52.133',master_user='replication',master_password='123456',master_log_file='mysql_bin.000003',master_log_pos=245;
#指定同步服务器的具体信息
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> start slave; #开启同步
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> show slave status\G; #查看状态
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.52.133
Master_User: replication
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql_bin.000003
Read_Master_Log_Pos: 575
Relay_Log_File: mariadb-relay-bin.000002
Relay_Log_Pos: 694
Relay_Master_Log_File: mysql_bin.000003
Slave_IO_Running: Yes #确认开启
Slave_SQL_Running: Yes #确认开启
Master_Server_Id: 2
1 row in set (0.00 sec)
ERROR: No query specified主服务器2：
MariaDB [(none)]> change master to master_host='192.168.52.135',master_user='replication',master_password='123456',master_log_file='mysql_bin.000003',master_log_pos=245;
#指定同步服务器的具体信息
Query OK, 0 rows affected (0.02 sec)
MariaDB [(none)]> start slave; #开启同步
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> show slave status\G; #查看状态
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.52.135
Master_User: replication
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql_bin.000003
Read_Master_Log_Pos: 575
Relay_Log_File: mariadb-relay-bin.000002
Relay_Log_Pos: 694
Relay_Master_Log_File: mysql_bin.000003
Slave_IO_Running: Yes #确认开启
Slave_SQL_Running: Yes #确认开启
Master_Server_Id: 1
1 row in set (0.00 sec)
ERROR: No query specified3, the test master primary synchronization
主服务器1：
MariaDB [(none)]> create database school; #创建数据库school
Query OK, 1 row affected (0.01 sec)
MariaDB [(none)]> show databases; #查看数据库
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| school | #创建成功
| test |
+--------------------+
5 rows in set (0.00 sec)主服务器2：
MariaDB [(none)]> show databases; #查看数据库
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| school | #同步成功
| test |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> drop database school; #删除数据库school
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> show databases; #查看数据库（删除成功）
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
MariaDB [(none)]>主服务器1：
MariaDB [(none)]> show databases; #查看数据库（同步成功）
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
MariaDB [(none)]> 4, the configuration from the server 1 as the master server from the library 1
从服务器1：
[root@db3 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> change master to master_host='192.168.52.135',master_user='replication',master_password='123456',master_log_file='mysql_bin.000003',master_log_pos=245;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]>从服务器2：
[root@db4 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> change master to master_host='192.168.52.135',master_user='replication',master_password='123456',master_log_file='mysql_bin.000003',master_log_pos=245;
Query OK, 0 rows affected (0.02 sec)
MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> 5, from the multi-mode multi-master test
主服务器1：
MariaDB [(none)]> create database myschool; #创建数据库myschool
Query OK, 1 row affected (0.01 sec)
MariaDB [(none)]> show databases; #查看数据库
+--------------------+
| Database |
+--------------------+
| information_schema |
| myschool | #创建成功
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> quit
Bye
[root@db1 ~]#主服务器2：
MariaDB [(none)]> show databases; #查看数据库
+--------------------+
| Database |
+--------------------+
| information_schema |
| myschool | #同步成功
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> quit
Bye
[root@db2 ~]#从服务器1：
MariaDB [(none)]> show databases; #查看数据库
+--------------------+
| Database |
+--------------------+
| information_schema |
| myschool | #同步成功
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> quit
Bye
[root@db3 ~]#从服务器2：
MariaDB [(none)]> show databases; #查看数据库
+--------------------+
| Database |
+--------------------+
| information_schema |
| myschool | #同步成功
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> quit
Bye
[root@db4 ~]#Third, the installation configuration MySQL-MMM
1, four MySQL servers are installed MMM
[root@db1 ~]# yum -y install mysql-mmm*
........//省略过程
[root@db1 ~]#
[root@db2 ~]# yum -y install mysql-mmm*
.......//省略过程
[root@db2 ~]#
[root@db3 ~]# yum -y install mysql-mmm*
........//省略过程
[root@db3 ~]#
[root@db4 ~]# yum -y install mysql-mmm*
.........//省略过程
[root@db4 ~]#2, modify the configuration file /etc/mysql-mmm/mmm_common.conf
[root@db1 ~]# vim /etc/mysql-mmm/mmm_common.conf
<host default>
cluster_interface ens33
pid_path /run/mysql-mmm-agent.pid
bin_path /usr/libexec/mysql-mmm/
replication_user replication
replication_password 123456
agent_user mmm_agent
agent_password 123456
</host>
<host db1>
ip 192.168.52.135
mode master
peer db2
</host>
<host db2>
ip 192.168.52.133
mode master
peer db1
</host>
<host db3>
ip 192.168.52.134
mode slave
</host>
<host db4>
ip 192.168.52.148
mode slave
</host>
<role writer>
hosts db1, db2
ips 192.168.52.200
mode exclusive
</role>
<role reader>
hosts db3, db4
ips 192.168.52.210, 192.168.52.220
mode balanced
</role>3, the /etc/mysql-mmm/mmm_common.conf profile, the other three push server
[root@db1 ~]# scp /etc/mysql-mmm/mmm_common.conf [email protected]:/etc/mysql-mmm/
[email protected]'s password:
mmm_common.conf 100% 837 1.1MB/s 00:00
[root@db1 ~]# scp /etc/mysql-mmm/mmm_common.conf [email protected]:/etc/mysql-mmm/
[email protected]'s password:
mmm_common.conf 100% 837 1.1MB/s 00:00
[root@db1 ~]# scp /etc/mysql-mmm/mmm_common.conf [email protected]:/etc/mysql-mmm/
[email protected]'s password:
mmm_common.conf 100% 837 951.0KB/s 00:00 4, the local configuration server yum source monitor on the monitor
[root@localhost ~]# hostnamectl set-hostname monitor
[root@localhost ~]# su
[root@monitor ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
--2019-11-25 11:40:39-- http://mirrors.aliyun.com/repo/Centos-7.repo
正在解析主机 mirrors.aliyun.com (mirrors.aliyun.com)... 124.14.2.222, 124.14.2.218, 124.14.2.234, ...
正在连接 mirrors.aliyun.com (mirrors.aliyun.com)|124.14.2.222|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：2523 (2.5K) [application/octet-stream]
正在保存至: “/etc/yum.repos.d/CentOS-Base.repo”
100%[====================================================================================>] 2,523 --.-K/s 用时 0s
2019-11-25 11:40:39 (663 MB/s) - 已保存 “/etc/yum.repos.d/CentOS-Base.repo” [2523/2523])
[root@monitor ~]#
[root@monitor ~]# yum -y install epel-release
..........//省略过程
[root@monitor ~]# yum clean all && yum makecache
.........//省略过程
[root@monitor ~]# yum -y install mysql-mmm*
.........//省略过程5, the main server 1, the monitor profile push /etc/mysql-mmm/mmm_common.conf
[root@db1 ~]# scp /etc/mysql-mmm/mmm_common.conf [email protected]:/etc/mysql-mmm/
[email protected]'s password:
mmm_common.conf 100% 837 1.4MB/s 00:00
[root@db1 ~]#6, modify the configuration file /etc/mysql-mmm/mmm_mon.conf
[root@monitor ~]# vim /etc/mysql-mmm/mmm_mon.conf
ping_ips 192.168.52.135,192.168.52.133,192.168.52.134,192.168.52.148 #监控服务器IP
auto_set_online 10
<host default>
monitor_user mmm_monitor #用户名
monitor_password 123456 #密码
</host>7, respectively, in the four authorized access to monitor MySQL server
主服务器1：
[root@db1 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 8
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> grant super, replication client, process on *.* to 'mmm_agent'@'192.168.52.%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> grant replication client on *.* to 'mmm_monitor'@'192.168.52.%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> quit
Bye
[root@db1 ~]#主服务器2：
[root@db2 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 6
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> grant super, replication client, process on *.* to 'mmm_agent'@'192.168.52.%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> grant replication client on *.* to 'mmm_monitor'@'192.168.52.%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> quit
Bye
[root@db2 ~]#从服务器1：
[root@db3 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 5
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> grant super, replication client, process on *.* to 'mmm_agent'@'192.168.52.%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> grant replication client on *.* to 'mmm_monitor'@'192.168.52.%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> quit
Bye
[root@db3 ~]#从服务器2：
[root@db4 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 5
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> grant super, replication client, process on *.* to 'mmm_agent'@'192.168.52.%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> grant replication client on *.* to 'mmm_monitor'@'192.168.52.%' identified by '123456';
Query OK, 0 rows affected (0.02 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> quit
Bye
[root@db4 ~]#8, respectively, modify /etc/mysql-mmm/mmm_agent.conf file MySQL server
主服务器1：
[root@db1 ~]# 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 db1 #根据不同主机修改
[root@db1 ~]# systemctl start mysql-mmm-agent.service #开启服务
[root@db1 ~]# systemctl enable mysql-mmm-agent.service #开机自启动
Created symlink from /etc/systemd/system/multi-user.target.wants/mysql-mmm-agent.service to /usr/lib/systemd/system/mysql-mmm-agent.service.
[root@db1 ~]# 主服务器2：
[root@db2 ~]# 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 db2 #根据不同主机修改
[root@db2 ~]# systemctl start mysql-mmm-agent.service #开启服务
[root@db2 ~]# systemctl enable mysql-mmm-agent.service #开机自启动
Created symlink from /etc/systemd/system/multi-user.target.wants/mysql-mmm-agent.service to /usr/lib/systemd/system/mysql-mmm-agent.service.
[root@db2 ~]#从服务器1：
[root@db3 ~]# 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 db3 #根据不同主机修改
[root@db3 ~]# systemctl start mysql-mmm-agent.service #开启服务
[root@db3 ~]# systemctl enable mysql-mmm-agent.service #开机自启动
Created symlink from /etc/systemd/system/multi-user.target.wants/mysql-mmm-agent.service to /usr/lib/systemd/system/mysql-mmm-agent.service.
[root@db3 ~]#从服务器2：
[root@db4 ~]# 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 db4 #根据不同主机修改
[root@db4 ~]# systemctl start mysql-mmm-agent.service #开启服务
[root@db4 ~]# systemctl enable mysql-mmm-agent.service #开机自启动
Created symlink from /etc/systemd/system/multi-user.target.wants/mysql-mmm-agent.service to /usr/lib/systemd/system/mysql-mmm-agent.service.
[root@db4 ~]#Fourth, the test MMM availability
1, open mysql-mmm-monitor.service
[root@monitor ~]# systemctl stop firewalld.service #关闭防火墙
[root@monitor ~]# setenforce 0 #关闭增强性安全功能
[root@monitor ~]# systemctl start mysql-mmm-monitor.service #开启服务
[root@monitor ~]# mmm_control show #测试群集
db1(192.168.52.135) master/ONLINE. Roles: writer(192.168.52.200)
db2(192.168.52.133) master/ONLINE. Roles:
db3(192.168.52.134) slave/ONLINE. Roles: reader(192.168.52.220)
db4(192.168.52.148) slave/ONLINE. Roles: reader(192.168.52.210)2, check the cluster (all ok)
[root@monitor ~]# mmm_control checks all
db4 ping [last change: 2019/11/25 12:15:00] OK
db4 mysql [last change: 2019/11/25 12:15:00] OK
db4 rep_threads [last change: 2019/11/25 12:15:00] OK
db4 rep_backlog [last change: 2019/11/25 12:15:00] OK: Backlog is null
db2 ping [last change: 2019/11/25 12:15:00] OK
db2 mysql [last change: 2019/11/25 12:15:00] OK
db2 rep_threads [last change: 2019/11/25 12:15:00] OK
db2 rep_backlog [last change: 2019/11/25 12:15:00] OK: Backlog is null
db3 ping [last change: 2019/11/25 12:15:00] OK
db3 mysql [last change: 2019/11/25 12:15:00] OK
db3 rep_threads [last change: 2019/11/25 12:15:00] OK
db3 rep_backlog [last change: 2019/11/25 12:15:00] OK: Backlog is null
db1 ping [last change: 2019/11/25 12:15:00] OK
db1 mysql [last change: 2019/11/25 12:15:00] OK
db1 rep_threads [last change: 2019/11/25 12:15:00] OK
db1 rep_backlog [last change: 2019/11/25 12:15:00] OK: Backlog is null
[root@monitor ~]#3, is switched writer db2
[root@monitor ~]# 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@monitor ~]# mmm_control show
db1(192.168.52.135) master/ONLINE. Roles:
db2(192.168.52.133) master/ONLINE. Roles: writer(192.168.52.200)
db3(192.168.52.134) slave/ONLINE. Roles: reader(192.168.52.220)
db4(192.168.52.148) slave/ONLINE. Roles: reader(192.168.52.210)
[root@monitor ~]#4, the monitor installation mariadb Service
[root@monitor ~]# yum install mariadb-server mariadb -y
.......//省略过程
[root@monitor ~]#5, each monitor authorized access to the main server 1
主服务器1：
[root@db1 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 464
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> grant all on *.* to 'testdb'@'192.168.52.150' identified by '123456'; #授权
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> 6, log in with the master server monitor virtual IP
[root@monitor ~]# mysql -u testdb -p123456 -h 192.168.52.200
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 584
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| myschool |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
MariaDB [(none)]> 7, turn off the main server MySQL service 1
[root@db1 ~]# systemctl stop mariadb.service
[root@db1 ~]# 8, delete the database on the monitor server myschool
monitor：
MariaDB [(none)]> drop database myschool;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
MariaDB [(none)]>9, respectively, to see three did not close the database server
主服务器2:
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
MariaDB [(none)]> 从服务器1:
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
MariaDB [(none)]> 从服务器2:
MariaDB [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
MariaDB [(none)]> 10, the main server restart MySQL service 1 to view the database
[root@db1 ~]# systemctl stop mariadb.service
[root@db1 ~]#
[root@db1 ~]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 464
Server version: 5.5.64-MariaDB MariaDB Server
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases; #查看数据库（同步成功）
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
MariaDB [(none)]>