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Mysql MMM 高可用

时间:2014-08-19 15:54:55      阅读:411      评论:0      收藏:0      [点我收藏+]

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一、Mysql MMM 高可用概况:

mmm_mond  负责所有的监控工作的监控守护进程,决定节点的移除等;

mmm_agentd  运行在mysql服务器上的代理守护进程,通过简单远程服务集提供给监控节点;

mmm_control  命令行管理mmm_mond进程;

 

Monitor:192.168.209.18

DB1:192.168.209.19

DB2:192.168.209.20

DB3:192.168.209.21

 

virtual write ip:192.168.209.4

virtual read ip:192.168.209.5

virtual read ip:192.168.209.6

 

实验所有密码都为123456

数据库为:test1

数据库用户为:repl

replication_user        repl

agent_user              mmm_agent

monitor_user        mmm_monitor

 

架构:

DB1,DB2互为主从,DB3DB1的从服务

此类架构,DB1正常的时候,DB3是与DB1同步数据,DB1mysql服务不可用时,DB3将与DB2同步数据.

 

二、安装mysql ,参见:《以普通用户权限安装mysql》,http://www.cnblogs.com/krainbow/p/3894154.html 

 

三、mysql主从配置及状态检查

安装好mysql之后,需要配置各服务之间的主从关系

3.1 编辑修改mysql配置文件my.cnf,如下:

Db1

cat  /etc/my.cnf | grep -v "#"

[mysqld]

log_bin=mysql-bin

server-id=19

replicate-do-db = test1

auto-increment-increment = 3

auto-increment-offset = 1

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

 

Db2:

[mysqld]

log_bin=mysql-bin

server-id=20

replicate-do-db = test1

auto-increment-increment = 3

auto-increment-offset = 2

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

 

Db3

[mysqld]

log_bin=mysql-bin

server_id=21

replicate-do-db = test1

auto-increment-increment = 3

auto-increment-offset = 3

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

 

3.2 配置主从关系:

db1db2配置成主主模式,db3配置为db1的从,用户为repl

db1上执行:

grant replication slave on *.* to repl@‘192.168.209.% identified by "123456";

flush privileges;

 

db2上执行:

grant replication slave on *.* to repl@‘192.168.209.% identified by "123456";

flush privileges;

 

db3上执行:

grant replication slave on *.* to repl@‘192.168.209.% identified by "123456";

flush privileges;

 

配置db2db3都与db1数据同步,在db2db3上面执行:

change master to master_host=‘192.168.209.19‘, master_port=3306, master_user=‘repl‘, master_password=‘123456‘;

start slave;

 

配置db1db2的从库,在db1上面执行:

change master to master_host=‘192.168.209.20‘, master_port=3306, master_user=‘repl‘, master_password=‘123456‘;

start slave;

 

以上均为简略写法,只有关键部分,详细的授权和主从配置命令,需要根据实际情况进行修改。

 

3.3 在主从没有问题之后,需要检查三台db服务器的slave状态是否正确。

DB1

mysql> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.209.20

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000010

          Read_Master_Log_Pos: 444

               Relay_Log_File: cdn19-relay-bin.000024

                Relay_Log_Pos: 607

        Relay_Master_Log_File: mysql-bin.000010

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

              Replicate_Do_DB: test1

          Replicate_Ignore_DB:

           Replicate_Do_Table:

       Replicate_Ignore_Table:

      Replicate_Wild_Do_Table:

  Replicate_Wild_Ignore_Table:

                   Last_Errno: 0

                   Last_Error:

                 Skip_Counter: 0

          Exec_Master_Log_Pos: 444

              Relay_Log_Space: 780

              Until_Condition: None

               Until_Log_File:

                Until_Log_Pos: 0

           Master_SSL_Allowed: No

           Master_SSL_CA_File:

           Master_SSL_CA_Path:

              Master_SSL_Cert:

            Master_SSL_Cipher:

               Master_SSL_Key:

        Seconds_Behind_Master: 0

Master_SSL_Verify_Server_Cert: No

                Last_IO_Errno: 0

                Last_IO_Error:

               Last_SQL_Errno: 0

               Last_SQL_Error:

  Replicate_Ignore_Server_Ids:

             Master_Server_Id: 20

                  Master_UUID: 318ae305-235a-11e4-aeb7-c81f66ec516e

             Master_Info_File: /mysql/mysql-5.6/data/master.info

                    SQL_Delay: 0

          SQL_Remaining_Delay: NULL

      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

           Master_Retry_Count: 86400

                  Master_Bind:

      Last_IO_Error_Timestamp:

     Last_SQL_Error_Timestamp:

               Master_SSL_Crl:

           Master_SSL_Crlpath:

           Retrieved_Gtid_Set:

            Executed_Gtid_Set:

                Auto_Position: 0

1 row in set (0.00 sec)

 

Db2

mysql> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.209.19

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000012

          Read_Master_Log_Pos: 120

               Relay_Log_File: cdn20-relay-bin.000023

                Relay_Log_Pos: 283

        Relay_Master_Log_File: mysql-bin.000012

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

              Replicate_Do_DB: test1

          Replicate_Ignore_DB:

           Replicate_Do_Table:

       Replicate_Ignore_Table:

      Replicate_Wild_Do_Table:

  Replicate_Wild_Ignore_Table:

                   Last_Errno: 0

                   Last_Error:

                 Skip_Counter: 0

          Exec_Master_Log_Pos: 120

              Relay_Log_Space: 619

              Until_Condition: None

               Until_Log_File:

                Until_Log_Pos: 0

           Master_SSL_Allowed: No

           Master_SSL_CA_File:

           Master_SSL_CA_Path:

              Master_SSL_Cert:

            Master_SSL_Cipher:

               Master_SSL_Key:

        Seconds_Behind_Master: 0

Master_SSL_Verify_Server_Cert: No

                Last_IO_Errno: 0

                Last_IO_Error:

               Last_SQL_Errno: 0

               Last_SQL_Error:

  Replicate_Ignore_Server_Ids:

             Master_Server_Id: 19

                  Master_UUID: 2f276e4a-235a-11e4-aeb7-b8ca3af2484f

             Master_Info_File: /mysql/mysql-5.6/data/master.info

                    SQL_Delay: 0

          SQL_Remaining_Delay: NULL

      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

           Master_Retry_Count: 86400

                  Master_Bind:

      Last_IO_Error_Timestamp:

     Last_SQL_Error_Timestamp:

               Master_SSL_Crl:

           Master_SSL_Crlpath:

           Retrieved_Gtid_Set:

            Executed_Gtid_Set:

                Auto_Position: 0

1 row in set (0.00 sec)

 

Db3

mysql> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.209.19

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000012

          Read_Master_Log_Pos: 120

               Relay_Log_File: cdn21-relay-bin.000002

                Relay_Log_Pos: 283

        Relay_Master_Log_File: mysql-bin.000012

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

              Replicate_Do_DB: test1

          Replicate_Ignore_DB:

           Replicate_Do_Table:

       Replicate_Ignore_Table:

      Replicate_Wild_Do_Table:

  Replicate_Wild_Ignore_Table:

                   Last_Errno: 0

                   Last_Error:

                 Skip_Counter: 0

          Exec_Master_Log_Pos: 120

              Relay_Log_Space: 456

              Until_Condition: None

               Until_Log_File:

                Until_Log_Pos: 0

           Master_SSL_Allowed: No

           Master_SSL_CA_File:

           Master_SSL_CA_Path:

              Master_SSL_Cert:

            Master_SSL_Cipher:

               Master_SSL_Key:

        Seconds_Behind_Master: 0

Master_SSL_Verify_Server_Cert: No

                Last_IO_Errno: 0

                Last_IO_Error:

               Last_SQL_Errno: 0

               Last_SQL_Error:

  Replicate_Ignore_Server_Ids:

             Master_Server_Id: 19

                  Master_UUID: 2f276e4a-235a-11e4-aeb7-b8ca3af2484f

             Master_Info_File: /mysql/mysql-5.6/data/master.info

                    SQL_Delay: 0

          SQL_Remaining_Delay: NULL

      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

           Master_Retry_Count: 86400

                  Master_Bind:

      Last_IO_Error_Timestamp:

     Last_SQL_Error_Timestamp:

               Master_SSL_Crl:

           Master_SSL_Crlpath:

           Retrieved_Gtid_Set:

            Executed_Gtid_Set:

                Auto_Position: 0

1 row in set (0.00 sec)

 

四、安装配置mysql-mmm软件

4.1 软件安装

monitor

yum install -y mysql-mmm*

 

all db

yum install -y mysql-mmm-agent*

 

4.2 数据库授权

all db

grant super, replication client, process on *.* to ‘mmm_agent‘@‘192.168.209.%‘ identified by ‘123456‘;

grant replication client on *.* to ‘mmm_monitor‘@‘192.168.209.%‘ identified by ‘123456‘;

flush privileges;

 

4.3 配置文件修改

all 服务器

四台服务器完全一致的配置

 

[root@cdn18 ~]# vi /etc/mysql-mmm/mmm_common.conf

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        repl

    replication_password    123456

    agent_user              mmm_agent

    agent_password          123456

</host>

 

<host db1>

    ip      192.168.209.19

    mode    master

    peer    db2

</host>

 

<host db2>

    ip      192.168.209.20

    mode    master

    peer    db1

</host>

 

<host db3>

    ip      192.168.209.21

    mode    slave

    peer    db3

</host>

 

<role writer>

    hosts   db1, db2

    ips     192.168.209.4

    mode    exclusive

</role>

 

<role reader>

    hosts   db3

    ips     192.168.209.5,192.168.209.6

    mode    balanced

</role>

 

peer的表示等同,表示db1db2同等。

ips指定VIP

mode有两种模式:exclusive排他,此模式下任何时候只能一个host拥有该角色

balanced模式可以有多个host同时拥有此角色。一般writerexclusivereaderbalanced

 

修改每台dbagent配置,标注对应的数据库id

vim /etc/mysql-mmm/mmm_agent.conf

db1db2db3对应修改为:

this db1、this db2、this db3

形如:

[root@cdn19 ~]# cat /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

 

 

修改monitor服务器配置

[root@cdn18 ~]# cat /etc/mysql-mmm/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            192.168.209.19,192.168.209.20

    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

 

六、启动服务

6.1 启动agent服务

db服务器:/etc/init.d/mysql-mmm-agent restart

 

6.2 启动monitor服务

monitor服务器:/etc/init.d/mysql-mmm-monitor restart

 

6.3 状态检查

monitor服务器

[root@cdn18 ~]# mmm_control checks all

db2  ping         [last change: 2014/08/19 13:50:08]  OK

db2  mysql        [last change: 2014/08/19 13:51:36]  OK

db2  rep_threads  [last change: 2014/08/19 13:51:30]  OK

db2  rep_backlog  [last change: 2014/08/19 13:51:36]  OK: Backlog is null

db3  ping         [last change: 2014/08/19 13:50:08]  OK

db3  mysql        [last change: 2014/08/19 13:50:08]  OK

db3  rep_threads  [last change: 2014/08/19 13:50:08]  OK

db3  rep_backlog  [last change: 2014/08/19 13:50:08]  OK: Backlog is null

db1  ping         [last change: 2014/08/19 13:50:08]  OK

db1  mysql        [last change: 2014/08/19 13:50:08]  OK

db1  rep_threads  [last change: 2014/08/19 13:50:08]  OK

db1  rep_backlog  [last change: 2014/08/19 13:50:08]  OK: Backlog is null

 

[root@cdn18 ~]# mmm_control show

  db1(192.168.209.19) master/ONLINE. Roles: writer(192.168.209.4)

  db2(192.168.209.20) master/ONLINE. Roles:

  db3(192.168.209.21) slave/ONLINE. Roles: reader(192.168.209.5), reader(192.168.209.6)

 

6.4 vip切换

停掉db1,看192.168.209.4是否会切换到192.168.209.20db2)服务器,同时,192.168.209.21db3)的mysql是否会将master服务器切换为192.168.209.20db2

登录db1

执行:service mysql stop

停止db1mysql服务

 

monitor服务器执行:

[root@cdn18 ~]# mmm_control show

  db1(192.168.209.19) master/HARD_OFFLINE. Roles:

  db2(192.168.209.20) master/ONLINE. Roles: writer(192.168.209.4)

  db3(192.168.209.21) slave/ONLINE. Roles: reader(192.168.209.5), reader(192.168.209.6)

 

[root@cdn18 ~]# mmm_control checks all

db2  ping         [last change: 2014/08/19 13:50:08]  OK

db2  mysql        [last change: 2014/08/19 13:51:36]  OK

db2  rep_threads  [last change: 2014/08/19 13:51:30]  OK

db2  rep_backlog  [last change: 2014/08/19 13:51:36]  OK: Backlog is null

db3  ping         [last change: 2014/08/19 13:50:08]  OK

db3  mysql        [last change: 2014/08/19 13:50:08]  OK

db3  rep_threads  [last change: 2014/08/19 13:50:08]  OK

db3  rep_backlog  [last change: 2014/08/19 13:50:08]  OK: Backlog is null

db1  ping         [last change: 2014/08/19 13:50:08]  OK

db1  mysql        [last change: 2014/08/19 14:06:58]  ERROR: Connect error (host = 192.168.209.19:3306, user = mmm_monitor)! Lost connection to MySQL server at ‘reading initial communication packet‘, system error: 111

db1  rep_threads  [last change: 2014/08/19 13:50:08]  OK

db1  rep_backlog  [last change: 2014/08/19 13:50:08]  OK: Backlog is null

 

db3执行,可以发现master_host已经切换到db2

mysql> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.209.20

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: mysql-bin.000011

          Read_Master_Log_Pos: 120

               Relay_Log_File: cdn21-relay-bin.000002

                Relay_Log_Pos: 283

        Relay_Master_Log_File: mysql-bin.000011

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

              Replicate_Do_DB: test1

          Replicate_Ignore_DB:

           Replicate_Do_Table:

       Replicate_Ignore_Table:

      Replicate_Wild_Do_Table:

  Replicate_Wild_Ignore_Table:

                   Last_Errno: 0

                   Last_Error:

                 Skip_Counter: 0

          Exec_Master_Log_Pos: 120

              Relay_Log_Space: 456

              Until_Condition: None

               Until_Log_File:

                Until_Log_Pos: 0

           Master_SSL_Allowed: No

           Master_SSL_CA_File:

           Master_SSL_CA_Path:

              Master_SSL_Cert:

            Master_SSL_Cipher:

               Master_SSL_Key:

        Seconds_Behind_Master: 0

Master_SSL_Verify_Server_Cert: No

                Last_IO_Errno: 0

                Last_IO_Error:

               Last_SQL_Errno: 0

               Last_SQL_Error:

  Replicate_Ignore_Server_Ids:

             Master_Server_Id: 20

                  Master_UUID: 318ae305-235a-11e4-aeb7-c81f66ec516e

             Master_Info_File: /mysql/mysql-5.6/data/master.info

                    SQL_Delay: 0

          SQL_Remaining_Delay: NULL

      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

           Master_Retry_Count: 86400

                  Master_Bind:

      Last_IO_Error_Timestamp:

     Last_SQL_Error_Timestamp:

               Master_SSL_Crl:

           Master_SSL_Crlpath:

           Retrieved_Gtid_Set:

            Executed_Gtid_Set:

                Auto_Position: 0

1 row in set (0.00 sec)

 

 

 

 

 

 

Mysql MMM 高可用,布布扣,bubuko.com

Mysql MMM 高可用

标签:style   blog   http   color   os   io   strong   文件   

原文地址:http://www.cnblogs.com/krainbow/p/3922035.html

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