mysql mmm安装管理详解

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机器简介：
monitor                192.168.146.131        监控服务器
master-001        192.168.146.129        读写主机001
master-002        192.168.146.130        读写主机002
slave-001        192.168.146.131 只读主机001

虚拟IP分配
master-001 192.168.146.135        writer
master-002 192.168.146.136        reader
slave-001  192.168.146.137        reader


三台相同操作：
关闭防火墙
一，安装mysql
二，mysql 权限赋值
GRANT REPLICATION SLAVE ON *.* TO 'myrepl'@'192.168.146.%' IDENTIFIED BY '123456';
GRANT REPLICATION CLIENT                 ON *.* TO 'mmm_monitor'@'192.168.146.%' IDENTIFIED BY 'monitor';
GRANT SUPER, REPLICATION CLIENT, PROCESS ON *.* TO 'mmm_agent'@'192.168.146.%'   IDENTIFIED BY 'agent';

二，安装MMM
安装mysql-MMM
安装依赖包：
yum install epel-release
yum install  perl-Log-Log4perl-Appender-Socket-UNIX
rpm 安装
rpm -ivh mysql-mmm-2.2.1-2.el6.noarch.rpm
安装mysql-agent
安装依赖包：
yum install -y perl-Algorithm-Diff perl-Class-Singleton perl-Proc-Daemon perl-Net-ARP perl-DBD-mysql
rpm 安装
rpm -ivh mysql-mmm-agent-2.2.1-2.el6.noarch.rpm

chkconfig mysql-mmm-agent on


（131上）monitor 机器上安装monitor包
rpm -ivh mysql-mmm-monitor-2.2.1-2.el6.noarch.rpm

三.配置MMM

修改my.cnf
  db1
        server-id= 1
        gtid_mode= on
        log_slave_updates=1           #当一个主故障，另一个立即接管
        enforce_gtid_consistency= 1
        auto-increment-increment = 2
        auto-increment-offset = 1
        replicate-ignore-db=mysql,information_schema #不同步的数据库，多个写多行
  db2
        server-id= 2
        gtid_mode= on
        log_slave_updates=1           #当一个主故障，另一个立即接管
        enforce_gtid_consistency= 1
        auto-increment-increment = 2
        auto-increment-offset = 2
        replicate-ignore-db=mysql,information_schema #不同步的数据库，多个写多行

  db3
        server-id= 3
        gtid_mode= on
        log_slave_updates=1           #当一个主故障，另一个立即接管
        enforce_gtid_consistency= 1
        replicate-ignore-db=mysql,information_schema #不同步的数据库，多个写多行
        read_only=1

配置主从
130 和131 上操作
CHANGE MASTER TO MASTER_HOST='192.168.146.129',MASTER_USER='myrepl',MASTER_PASSWORD='123456',MASTER_PORT=3306,MASTER_LOG_FILE='mysql-bin.000022', MASTER_CONNECT_RETRY=311;
start slave;
129上操作
130 和131 上操作
CHANGE MASTER TO MASTER_HOST='192.168.146.130',MASTER_USER='myrepl',MASTER_PASSWORD='123456',MASTER_PORT=3306,MASTER_LOG_FILE='mysql-bin.000032', MASTER_CONNECT_RETRY=234;
start slave;

配置/etc/mysql-mmm/mmm_common.conf #三机器统一
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        myrepl
    replication_password    123456
    agent_user              mmm_agent
    agent_password          agent
</host>

<host db1>
    ip      192.168.146.129
    mode    master
    peer    db2
</host>

<host db2>
    ip      192.168.146.130
    mode    master
    peer    db1
</host>

<host db3>
    ip      192.168.146.131
    mode    slave
</host>

<role writer>
    hosts   db1, db2
    ips     192.168.146.135
    mode    exclusive
</role>

<role reader>
    hosts   db1, db2, db3
    ips     192.168.146.136, 192.168.146.137, 192.168.146.138
    mode    balanced
</role>

配置/etc/mysql-mmm/mmm_agent.conf
this db1 #是谁就写谁

管理机上配置 mmm_mon.conf
include mmm_common.conf

<monitor>
    ip                  127.0.0.1
    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            192.168.146.129,192.168.146.130  #其他机器IP
    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    monitor
</host>

debug 0

加入自启动：
chkconfig mysql-mmm-monitor on
chkconfig mysql-mmm-agent on
开启服务：
启动 mmm_agent
service mysql-mmm-agent start
启动 mmm_monitor
service mysql-mmm-monitor start

管理命令
[iyunv@mysqlDB03 mysql-mmm]# mmm_control --help
Invalid command '--help'

Valid commands are:
    help                              - show this message
    ping                              - ping monitor
    show                              - show status
    checks [<host>|all [<check>|all]] - show checks status
    set_online <host>                 - set host <host> online
    set_offline <host>                - set host <host> offline
    mode                              - print current mode.
    set_active                        - switch into active mode.
    set_manual                        - switch into manual mode.
    set_passive                       - switch into passive mode.
    move_role [--force] <role> <host> - move exclusive role <role> to host <host>
                                        (Only use --force if you know what you are doing!)
    set_ip <ip> <host>                - set role with ip <ip> to host <host>
       
[iyunv@mysqlDB03 mysql-mmm]# mmm_control show
  db1(192.168.146.129) master/ONLINE. Roles: reader(192.168.146.138), writer(192.168.146.135)
  db2(192.168.146.130) master/ONLINE. Roles: reader(192.168.146.137)
  db3(192.168.146.131) slave/ONLINE. Roles: reader(192.168.146.136

[iyunv@mysqlDB03 mysql-mmm]# mmm_control checks all
db2  ping         [last change: 2016/11/10 19:18:54]  OK
db2  mysql        [last change: 2016/11/10 19:18:54]  OK
db2  rep_threads  [last change: 2016/11/10 19:18:54]  OK
db2  rep_backlog  [last change: 2016/11/10 19:18:54]  OK: Backlog is null
db3  ping         [last change: 2016/11/10 19:18:54]  OK
db3  mysql        [last change: 2016/11/10 19:19:17]  OK
db3  rep_threads  [last change: 2016/11/10 19:19:17]  OK
db3  rep_backlog  [last change: 2016/11/10 19:19:17]  OK: Backlog is null
db1  ping         [last change: 2016/11/10 19:18:54]  OK
db1  mysql        [last change: 2016/11/10 19:18:54]  OK
db1  rep_threads  [last change: 2016/11/10 19:18:54]  OK
db1  rep_backlog  [last change: 2016/11/10 19:18:54]  OK: Backlog is null

测试转换:
DB1上操作：
[iyunv@mysqlDB01 mysql-mmm]# mysqladmin -uroot -p -S /tmp/mysql.sock shutdown
Enter password:

管理机器上查看：
Bye
[iyunv@mysqlDB03 mysql-mmm]# mmm_control checks all
db2  ping         [last change: 2016/11/10 19:18:54]  OK
db2  mysql        [last change: 2016/11/10 19:18:54]  OK
db2  rep_threads  [last change: 2016/11/10 19:18:54]  OK
db2  rep_backlog  [last change: 2016/11/10 19:18:54]  OK: Backlog is null
db3  ping         [last change: 2016/11/10 19:18:54]  OK
db3  mysql        [last change: 2016/11/10 19:39:20]  OK
db3  rep_threads  [last change: 2016/11/10 19:39:20]  OK
db3  rep_backlog  [last change: 2016/11/10 19:19:17]  OK: Backlog is null
db1  ping         [last change: 2016/11/10 19:18:54]  OK
db1  mysql        [last change: 2016/11/10 19:31:34]  ERROR: Connect error (host = 192.168.146.129:3306, user = mmm_monitor)! Lost connection to MySQL server at 'reading initial communication packet', system error: 111
db1  rep_threads  [last change: 2016/11/10 19:18:54]  OK
db1  rep_backlog  [last change: 2016/11/10 19:18:54]  OK: Backlog is null

[iyunv@mysqlDB03 mysql-mmm]# mmm_control show
  db1(192.168.146.129) master/HARD_OFFLINE. Roles:
  db2(192.168.146.130) master/ONLINE. Roles: reader(192.168.146.137), writer(192.168.146.135)
  db3(192.168.146.131) slave/ONLINE. Roles: reader(192.168.146.136), reader(192.168.146.138)

启动DB1 等待60s再看:
[iyunv@mysqlDB03 mysql-mmm]# mmm_control show
  db1(192.168.146.129) master/ONLINE. Roles: reader(192.168.146.136)
  db2(192.168.146.130) master/ONLINE. Roles: reader(192.168.146.137), writer(192.168.146.135)
  db3(192.168.146.131) slave/ONLINE. Roles: reader(192.168.146.138)

我们想把writer角色切回到db1上：

[iyunv@mysqlDB03 mysql-mmm]# mmm_control move_role writer db1
OK: Role 'writer' has been moved from 'db2' to 'db1'. Now you can wait some time and check new roles info!

[iyunv@mysqlDB03 mysql-mmm]# mmm_control show
  db1(192.168.146.129) master/ONLINE. Roles: reader(192.168.146.136), writer(192.168.146.135)
  db2(192.168.146.130) master/ONLINE. Roles: reader(192.168.146.137)
  db3(192.168.146.131) slave/ONLINE. Roles: reader(192.168.146.138)


遇到两个问题
1. 监控程序服务器无法启动

   在管理服务器上，一切都完成后，通过mmm_control查看状态，得到下面的错误信息：
   ERROR: Cant connect to monitor daemon! 通过编辑/etc/mysql-mmm/mmm_mon.conf文件将debug 0改为debug 1，打开监控程序的debug状态。重新启动监控程序（service mysql-mmm-monitor restart），就会看到详细的错误信息，找不到Perl Time HiRes库。执行yum -y install perl-Time-HiRes*就可以解决。   
2. 防火墙问题导致Warning: agent on host db1 is not reachable.

    控制台程序正确启动后，再次执行mmm_control show，却看到下面的输出：

# Warning: agent on host db1 is not reachable
# Warning: agent on host db2 is not reachable
  db1(192.168.146.129) master/ONLINE. Roles:
  db2(192.168.146.130) master/ONLINE. Roles:
  db3(192.168.146.131) slave/ONLINE. Roles: reader(192.168.146.138)

再次打开debug，查看错误信息
  通过telnet 192.168.146.130 9989下面检查网络连接，得到了No route to host的错误信息。登录db1，关闭iptables（这不是一个好主意）。同样，关闭db2、db3上的防火墙，再次重启监控程序，一切回到正常状态！