MySQL 官方 Auto-Failover 功能测试

参考资料： http://www.clusterdb.com/mysql/replication-and-auto-failover-made-easy-with-mysql-utilities 环境介绍: master: demoenv-trial-1 slaves: demoenv-trial-2 demoenv-trial-3 1. 安装 Percona Server，在所有服务器上： $ sudo yum install ht

参考资料：
http://www.clusterdb.com/mysql/replication-and-auto-failover-made-easy-with-mysql-utilities

环境介绍:
master: demoenv-trial-1
slaves: demoenv-trial-2 demoenv-trial-3

1. 安装 Percona Server，在所有服务器上：
$ sudo yum install http://www.percona.com/downloads/percona-release/percona-release-0.0-1.x86_64.rpm
$ sudo yum install Percona-Server-shared-compat
$ sudo yum install Percona-Server-server-56

$ sudo yum install http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
$ sudo yum install mysql-utilities

2. 配置 /etc/my.cnf，在所有服务器上：
注意：确保 server-id 不同且 report-host 与自身主机名相同
$ sudo vim /etc/my.cnf

[mysqld]# basic settingdatadir = /opt/mysql/datatmpdir = /opt/mysql/tmpsocket = /opt/mysql/run/mysqld.sockport = 3306pid-file = /opt/mysql/run/mysqld.pid# innodb settingdefault-storage-engine = INNODBinnodb_file_per_table = 1log-bin = /opt/mysql/binlogs/bin-log-mysqldlog-bin-index = /opt/mysql/binlogs/bin-log-mysqld.indexinnodb_data_home_dir = /opt/mysql/datainnodb_data_file_path = ibdata1:10M:autoextendinnodb_log_group_home_dir = /opt/mysql/databinlog-do-db = testdb# server idserver-id=1# gtids settingbinlog-format = ROWlog-slave-updates = truegtid-mode = onenforce-gtid-consistency = truereport-host = demoenv-trial-1report-port = 3306master-info-repository = TABLErelay-log-info-repository = TABLEsync-master-info = 1# other settings[mysqld_safe]log-error = /opt/mysql/log/mysqld.logpid-file = /opt/mysql/run/mysqld.pidopen-files-limit = 8192[mysqlhotcopy]interactive-timeout[client]port = 3306socket = /opt/mysql/run/mysqld.sockdefault-character-set = utf8

3. 创建所需目录，在所有服务器上：
$ sudo mkdir -p /opt/mysql/{data,tmp,run,binlogs,log}
$ sudo chown mysql:mysql /opt/mysql/{data,tmp,run,binlogs,log}

4. 初始化数据库，在所有服务器上：
$ sudo -i
# su – mysql
$ mysql_install_db –user=mysql –datadir=/opt/mysql/data/
$ exit
# exit
$ sudo /etc/init.d/mysql start

5. 创建授权用户 root@’%’ 以便通过 mysqlreplicate 来进行主从复制的配置，在所有服务器上：
$ mysql -uroot

mysql> grant all on *.* to root@'%' identified by 'pass' with grant option;mysql> quit;

6. 创建复制所需的用户，在所有服务器上：
$ mysql -uroot

mysql> grant replication slave on *.* to 'rpl'@'%' identified by 'rpl';mysql> quit;

7. 配置主从复制，可选择任意一台服务器操作：
[dong.guo@demoenv-trial-1 ~]$ mysql -uroot

mysql> use mysql;mysql> drop user root@'demoenv-trial-1';mysql> quit;

[dong.guo@demoenv-trial-1 ~]$ mysqlreplicate –master=root:pass@’demoenv-trial-1′:3306 –slave=root:pass@’demoenv-trial-2′:3306 –rpl-user=rpl:rpl

# master on demoenv-trial-1: ... connected.# slave on demoenv-trial-2: ... connected.# Checking for binary logging on master...# set up replication...# ...done.

[dong.guo@demoenv-trial-1 ~]$ mysqlreplicate –master=root:pass@’demoenv-trial-1′:3306 –slave=root:pass@’demoenv-trial-3′:3306 –rpl-user=rpl:rpl

# master on demoenv-trial-1: ... connected.# slave on demoenv-trial-3: ... connected.# Checking for binary logging on master...# set up replication...# ...done.

8. 验证主从复制的数据完整性
[dong.guo@demoenv-trial-1 ~]$ mysql -uroot

mysql> create database testdb;mysql> quit;

[dong.guo@demoenv-trial-1 ~]$ mysql -uroot -ppass -h’demoenv-trial-2′ -e ‘show databases;’

+-------------------+| Database          |+-------------------+| information_schema|| mysql             || performance_schema|| test              || testdb            |+-------------------+

[dong.guo@demoenv-trial-1 ~]$ mysql -uroot -ppass -h’demoenv-trial-3′ -e ‘show databases;’

+-------------------+| Database          |+-------------------+| information_schema|| mysql             || performance_schema|| test              || testdb            |+-------------------+

[dong.guo@demoenv-trial-1 ~]$ mysqlrplshow –master=rpl:rpl@’demoenv-trial-1′:3306 –discover-slaves-login=root:pass;

# master on demoenv-trial-1: ... connected.# Finding slaves for master: demoenv-trial-1:3306# Replication Topology Graphdemoenv-trial-1:3306 (MASTER)  |   +--- demoenv-trial-2:3306 - (SLAVE)  |   +--- demoenv-trial-3:3306 - (SLAVE)

[dong.guo@demoenv-trial-1 ~]$ mysqlrplcheck –master=root:pass@’demoenv-trial-1′ –slave=root:pass@’demoenv-trial-2′

# master on demoenv-trial-1: ... connected.# slave on demoenv-trial-2: ... connected.Test Description                          Status---------------------Checking for binary logging on master     [pass]Are there binlog exceptions?              [WARN]+--------+--------+-----------+| server | do_db  | ignore_db |+--------+--------+-----------+| master | testdb |           |+--------+--------+-----------+Replication user exists?                  [pass]Checking server_id values                 [pass]Checking server_uuid values               [pass]Is slave connected to master?             [pass]Check master information file             [pass]Checking InnoDB compatibility             [pass]Checking storage engines compatibility    [pass]Checking lower_case_table_names setting   [pass]Checking slave delay (seconds behind master)                         [pass]# ...done.   

9. 关闭 master 测试 auto-failover
[dong.guo@demoenv-trial-1 ~]$ mysqlfailover –master=root:pass@’demoenv-trial-1′:3306 –discover-slaves-login=root:pass –rediscover

# Discovering slaves for master at demoenv-trial-1:3306# Discovering slave at demoenv-trial-2:3306# Found slave: demoenv-trial-2:3306# Discovering slave at demoenv-trial-3:3306# Found slave: demoenv-trial-3:3306# Checking privileges.# Discovering slaves for master at demoenv-trial-1:3306MySQL Replication Failover UtilityFailover Mode = auto   <span>本文来源gaodai#ma#com搞*!代#%^码$网*</span>  Next Interval = Sun Oct 20 06:58:52 2013Master Information------------------Binary Log File       Position  Binlog_Do_DB  Binlog_Ignore_DB  bin-log-mysqld.00000  299       testdb                          GTID Executed Set92df196b-3906-11e3-b6b6-000c290d14d7:1Replication Health Status+-----------------+------+--------+-------+-----------+---------------+| host            | port | role   | state | gtid_mode | health        |+-----------------+------+--------+-------+-----------+---------------+| demoenv-trial-1 | 3306 | MASTER | UP    | ON        | OK            || demoenv-trial-2 | 3306 | SLAVE  | UP    | ON        | OK            || demoenv-trial-3 | 3306 | SLAVE  | UP    | ON        | OK            |+-----------------+------+--------+-------+-----------+---------------+Q-quit R-refresh H-health G-GTID Lists U-UUIDs

然后，执行命令的终端就挂起了，需要另外开启一个终端来关闭master：
[dong.guo@demoenv-trial-1 ~]$ mysqladmin -uroot -ppass shutdown

接着，在刚刚挂起的终端上，可以看到：

Failover starting in 'auto' mode...# Candidate slave demoenv-trial-2:3306 will become the new master.# Checking slaves status (before failover).# Preparing candidate for failover.# Creating replication user if it does not exist.# Stopping slaves.# Performing STOP on all slaves.# Switching slaves to new master.# Disconnecting new master as slave.# Starting slaves.# Performing START on all slaves.# Checking slaves for errors.# Failover complete.# Discovering slaves for master at demoenv-trial-2:3306Failover console will restart in 5 seconds.MySQL Replication Failover UtilityFailover Mode = auto     Next Interval = Sun Oct 20 07:01:25 2013Master Information------------------Binary Log File       Position  Binlog_Do_DB  Binlog_Ignore_DB  bin-log-mysqld.00000  299       testdb                          GTID Executed Set92df196b-3906-11e3-b6b6-000c290d14d7:1Replication Health Status+-----------------+------+--------+-------+-----------+---------------+| host            | port | role   | state | gtid_mode | health        |+-----------------+------+--------+-------+-----------+---------------+| demoenv-trial-2 | 3306 | MASTER | UP    | ON        | OK            || demoenv-trial-3 | 3306 | SLAVE  | UP    | ON        | OK            |+-----------------+------+--------+-------+-----------+---------------+Q-quit R-refresh H-health G-GTID Lists U-UUIDs

服务器 ‘demoenv-trial-2’ 变成了新的master。

10. 插入数据测试主从复制
[dong.guo@demoenv-trial-2 ~]$ mysql -uroot

mysql> use testdb;Database changedmysql> CREATE TABLE `hostgroup` (    ->   `hostgroup_id` tinyint(4) NOT NULL AUTO_INCREMENT,    ->   `hostgroup_name` char(20) DEFAULT NULL,    ->   `hostgroup_next` tinyint(4) NOT NULL,    ->   `colo_name` char(4) NOT NULL,    ->   PRIMARY KEY (`hostgroup_id`)    -> ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;Query OK, 0 rows affected (0.10 sec)mysql> quit;

[dong.guo@demoenv-trial-2 binlogs]$ mysql -uroot -ppass -h’demoenv-trial-3′ testdb -e ‘show tables;’

+-----------------+| Tables_in_testdb|+-----------------+| hostgroup       |+-----------------+

11. 尝试将旧的master恢复
[dong.guo@demoenv-trial-1 ~]$ sudo /etc/init.d/mysql start
[dong.guo@demoenv-trial-1 ~]$ mysqlreplicate –master=root:pass@’demoenv-trial-2′:3306 –slave=root:pass@’demoenv-trial-1′:3306

# master on demoenv-trial-2: ... connected.# slave on demoenv-trial-1: ... connected.# Checking for binary logging on master...# setting up replication...# ...done.

在刚刚挂起的终端上，可以看到：

...Replication Health Status+-----------------+------+--------+-------+-----------+---------------+| host            | port | role   | state | gtid_mode | health        |+-----------------+------+--------+-------+-----------+---------------+| demoenv-trial-2 | 3306 | MASTER | UP    | ON        | OK            || demoenv-trial-1 | 3306 | SLAVE  | UP    | ON        | OK            || demoenv-trial-3 | 3306 | SLAVE  | UP    | ON        | OK            |+-----------------+------+--------+-------+-----------+---------------+Q-quit R-refresh H-health G-GTID Lists U-UUIDs

将旧的master恢复
[dong.guo@demoenv-trial-1 ~]$ mysqlrpladmin –master=root:pass@’demoenv-trial-2′:3306 –new-master=root:pass@’demoenv-trial-1′:3306 –demote-master –discover-slaves-login=root:pass switchover

# Discovering slaves for master at demoenv-trial-2:3306# Discovering slave at demoenv-trial-1:3306# Found slave: demoenv-trial-1:3306# Discovering slave at demoenv-trial-3:3306# Found slave: demoenv-trial-3:3306# Checking privileges.# Performing switchover from master at demoenv-trial-2:3306 to slave at demoenv-trial-1:3306.# Checking candidate slave prerequisites.# Checking slaves configuration to master.# Waiting for slaves to catch up to old master.# Stopping slaves.# Performing STOP on all slaves.# Demoting old master to be a slave to the new master.# Switching slaves to new master.# Starting all slaves.# Performing START on all slaves.# Checking slaves for errors.# Switchover complete.## Replication Topology Health:+-----------------+------+--------+-------+-----------+---------------+| host            | port | role   | state | gtid_mode | health        |+-----------------+------+--------+-------+-----------+---------------+| demoenv-trial-1 | 3306 | MASTER | UP    | ON        | OK            || demoenv-trial-2 | 3306 | SLAVE  | UP    | ON        | OK            || demoenv-trial-3 | 3306 | SLAVE  | UP    | ON        | OK            |+-----------------+------+--------+-------+-----------+---------------+# ...done.

在刚刚挂起的终端上，可以看到：

MySQL Replication Failover UtilityFailover Mode = auto     Next Interval = Sun Oct 20 07:30:07 2013Master Information------------------Binary Log File       Position  Binlog_Do_DB  Binlog_Ignore_DB  bin-log-mysqld.00000  710       testdb                          GTID Executed Set8a58172b-1efd-11e3-8cf1-000c2950fe0c:1 [...]Replication Health Status+-----------------+------+--------+-------+-----------+----------------------------------+| host            | port | role   | state | gtid_mode | health                           |+-----------------+------+--------+-------+-----------+----------------------------------+| demoenv-trial-2 | 3306 | MASTER | UP    | ON        | OK                               || demoenv-trial-1 | 3306 | SLAVE  | UP    | WARN      | Slave is not connected to master.|| demoenv-trial-3 | 3306 | SLAVE  | UP    | WARN      | Slave is not connected to master.|+-----------------+------+--------+-------+-----------+----------------------------------+Q-quit R-refresh H-health G-GTID Lists U-UUIDs

可以看到failover在手动恢复了旧的master之后已经停止了工作。

按下Q，然后重启auto-failover：
[dong.guo@demoenv-trial-1 ~]$ mysqlfailover –master=root:pass@’demoenv-trial-1′:3306 –discover-slaves-login=root:pass –rediscover

...Replication Health Status+-----------------+------+--------+-------+-----------+---------------+| host            | port | role   | state | gtid_mode | health        |+-----------------+------+--------+-------+-----------+---------------+| demoenv-trial-1 | 3306 | MASTER | UP    | ON        | OK            || demoenv-trial-2 | 3306 | SLAVE  | UP    | ON        | OK            || demoenv-trial-3 | 3306 | SLAVE  | UP    | ON        | OK            |+-----------------+------+--------+-------+-----------+---------------+Q-quit R-refresh H-health G-GTID Lists U-UUIDs

它又可以工作了。

12. 对于 auto-failover 的简短总结：
它包含在mysql-utilities这个软件包中；
它只能工作在MySQL 5.6 版本上，因为需要GITDs的支持；
它可以自动选取一个slave作为新的master，当现有的master死掉以后；
但是它不能自动将旧的master恢复，并且在手动恢复了旧的master之后也会停止工作。

原文地址：MySQL 官方 Auto-Failover 功能测试, 感谢原作者分享。

喜欢 (0)赏

[搞代码]

分享 (0)