一.MMM概述
MMM(Master-Master replication manager for Mysql)是一套灵活的脚本程序，用来监控和故障切换，管理mysql Master-Master复制的配置 (同一时间只有一个节点是可写的)。附带的工具套件可以实现多个slaves的read负载均衡，因此你可以使用这个工具移除一组服务器中复制延迟较高的服务器的虚拟IP，它还可以备份数据，两节点之间再同步等等。
MMM主要的功能通过下面三个脚本来实现：
mmm_mond
监控进程，负责所有的监控工作，决定和处理所有节点角色活动
mmm_agentd
运行在每个mysql服务器上的代理进程，完成监控的探针工作和执行简单的远端服务设置
mmm_control
一个简单的脚本，提供管理mmm_mond进程的命令
二.实验环境介绍
最基本的MMM安装必须至少需要2个数据库服务器和一个监控服务器,下面要配置的MySQL Cluster环境包含三台数据库服务器和一台监控服务器。
实验架构如下：
主机规划表
虚拟VIP规划表：
高可用性实现的前提：
1.时间同步，尽量使用NTP服务器； 2.hosts文件解析； [[email protected] ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 172.16.0.1 server.magelinux.com server 172.16.31.20 node3.stu31.com node3 172.16.31.21 node4.stu31.com node4 172.16.31.22 node5.stu31.com node5 172.16.31.23 node6.stu31.com node6 3.ssh无密钥通信； node3，node4和node6节点之间需要实现ssh无密钥通信 # ssh-keygen -t rsa -P "" # ssh-copy-id -i .ssh/id_rsa.pub [email protected] 测试： [[email protected] ~]# date ;ssh node4 date ; ssh node3 date; Sun Jan 25 16:40:51 CST 2015 Sun Jan 25 16:40:52 CST 2015 Sun Jan 25 16:40:52 CST 2015
三.编译安装mariadb数据库过程略。
提供的my.cnf如下：
[[email protected] ~]# grep -v ‘^#‘ /etc/my.cnf [client] port = 3306 socket = /tmp/mysql.sock [mysqld] port = 3306 socket = /tmp/mysql.sock skip-external-locking key_buffer_size = 256M max_allowed_packet = 1M table_open_cache = 256 sort_buffer_size = 1M read_buffer_size = 1M read_rnd_buffer_size = 4M myisam_sort_buffer_size = 64M thread_cache_size = 8 query_cache_size= 16M thread_concurrency = 4 datadir = /mydata/data innodb_file_per_table = on skip_name_resolve = on [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash [myisamchk] key_buffer_size = 128M sort_buffer_size = 128M read_buffer = 2M write_buffer = 2M [mysqlhotcopy] interactive-timeout
我这里提供一个脚本，基本上可以实现mariadb编译安装自动化：
[[email protected] ~]# cat installmysql.sh
#!/bin/bash
#install mysql
mysql_dir="/usr/local/mysql"
mysql_datadir="/mydata/data"
mysql_logdir="/mydata/data/"
mysql_passwd="oracle"
function install_mysql() {
yum groupinstall -y Development Tools
yum install -y cmake ncurses-devel openssl-devel openssl
cd /root/
useradd -M -s /sbin/nologin mysql
mkdir -p $mysql_datadir
chown mysql.mysql -R $mysql_datadir
tar zxf mariadb-10.0.12.tar.gz
cd mariadb-10.0.12
cmake . -DCMAKE_INSTALL_PREFIX=$mysql_dir/ -DMYSQL_DATADIR=$mysql_datadir -DWITH_INNOBASE_STORAGE_ENGINE=1 -DWITH_ARCHIVE_STORAGE_ENGINE=1 -DWITH_BLACKHOLE_STORAGE_ENGINE=1 -DENABLED_LOCAL_INFILE=1 -DMYSQL_TCP_PORT=3306 -DWITH_SSL=system -DWITH_ZLIB=system -DWITH_LIBWRAP=0 -DCMAKE_THREAD_PREFER_PTHREAD=1 -DEXTRA_CHARSETS=all -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DMYSQL_UNIX_ADDR=/tmp/mysql.sock -DWITH_DEBUG=0
make && make install
rm -rf /etc/my.cnf
rm -rf /etc/init.d/mysqld
mkdir $mysql_logdir/relaylog
mkdir $mysql_logdir/binlog
cp /root/my.cnf /etc/my.cnf
cp support-files/mysql.server /etc/init.d/mysqld
chmod 755 /etc/init.d/mysqld
chkconfig --add mysqld
chkconfig mysqld on
chown mysql.mysql -R $mysql_logdir
chown mysql.mysql -R $mysql_datadir
$mysql_dir/scripts/mysql_install_db --user=mysql --basedir=$mysql_dir --datadir=$mysql_datadir
/sbin/service mysqld start
echo ‘export PATH=$PATH:‘$mysql_dir‘/bin‘ >> /etc/profile
source /etc/profile
$mysql_dir/bin/mysql -e "grant all privileges on *.* to [email protected]‘%‘ identified by ‘$mysql_passwd‘ with grant option;"
$mysql_dir/bin/mysql -e "flush privileges;"
$mysql_dir/bin/mysql -e "delete from mysql.user where password=‘‘;"
/sbin/service mysqld restart
echo "mysql install success!"
}
install_mysql
将数据库源码包和配置好的my.cnf文件放置在/root目录下后即可进行编译安装；
在node3，node4和node6编译安装完成后即可进行双主单从复制架构实现；
四.构建双主单从复制架构
1.双主复制的数据库主配置文件配置
node3节点的配置：
[[email protected] ~]# vim /etc/my.cnf [mysqld] #在此配置段中增加如下内容； log-bin=mysql-bin binlog_format=mixed server-id = 1 relay-log=relay-bin auto_increment_offset=1 auto_increment_increment=2 log_slave_updates = 1
node4节点的配置：
[[email protected] ~]# vim /etc/my.cnf [mysqld] log-bin=mysql-bin binlog_format=mixed server-id = 10 relay-log = relay-bin auto_increment_offset=2 auto_increment_offset=2 log_slave_updates = 1
从节点node6：
node6节点的配置：
[[email protected] ~]# vim /etc/my.cnf [mysqld] log-bin=mysql-bin binlog_format=mixed server-id = 20 relay-log = relay-bin log_slave_updates = 1 read_only = on
修改过刚才的配置文件以后，在各节点重新启动mysqld服务器；
# service mysqld restart Shutting down MySQL.. [ OK ] Starting MySQL. [ OK ]
2.创建复制使用的mysql用户
为了方便，我们就授权一个repluser账户在172.16.0.0这个网段内都能实现复制；
在node3和node4节点上执行如下指令：
MariaDB [(none)]> grant replication slave,replication client on *.* to [email protected]‘172.16.%.%‘ identified by ‘replpass‘; MariaDB [(none)]> flush privileges;
3.同步数据
由于我们都是新装的库，数据是同步的，但是我们也简单操作以下步骤，开始配置同步数据到复制结尾，都不要让任何的mysql服务器写入数据，避免导致数据不同步。
查看两个节点的时间点；
node3节点的时间点； MariaDB [(none)]> show master status; +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000006 | 653 | | | +------------------+----------+--------------+------------------+ 1 row in set (0.00 sec) node4节点的时间点： MariaDB [(none)]> show master status; +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000006 | 653 | | | +------------------+----------+--------------+------------------+ 1 row in set (0.00 sec)
两个节点的时间点都是一致的，数据是一致的，那就方便设置了；
4.双主复制模型开启设置
node3节点启动： #开启复制； MariaDB [(none)]> change master to master_host=‘172.16.31.21‘,master_user=‘repluser‘,master_password=‘replpass‘,master_log_file=‘mysql-bin.000006‘,master_log_pos=653; #开启复制进程； MariaDB [(none)]> start slave;
node4节点启动： MariaDB [(none)]> change master to master_host=‘172.16.31.20‘,master_user=‘repluser‘,master_password=‘replpass‘,master_log_file=‘mysql-bin.000006‘,master_log_pos=653; MariaDB [(none)]> start slave;
5.查看节点的复制状态信息；
node3的节点的主从复制状态：
MariaDB [(none)]> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 172.16.31.21 Master_User: repluser Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000006 Read_Master_Log_Pos: 653 Relay_Log_File: relay-bin.000002 Relay_Log_Pos: 535 Relay_Master_Log_File: mysql-bin.000006 Slave_IO_Running: Yes Slave_SQL_Running: Yes 信息略； Seconds_Behind_Master: 0 1 row in set (0.00 sec)
node4节点的主从复制状态信息；
MariaDB [(none)]> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 172.16.31.20 Master_User: repluser Master_Port: 3306 Connect_Retry: 5 Master_Log_File: mysql-bin.000006 Read_Master_Log_Pos: 653 Relay_Log_File: relay-bin.000002 Relay_Log_Pos: 535 Relay_Master_Log_File: mysql-bin.000006 Slave_IO_Running: Yes Slave_SQL_Running: Yes 信息略； Seconds_Behind_Master: 0 1 row in set (0.00 sec)
6.简单的双主复制测试；
我们在node3节点插入测试数据库；
在hellodb中的teachers表中插入数据：
[[email protected] ~]# mysql -uroot -poracle < hellodb.sql 登录数据库： [[email protected] ~]# mysql -uroot -poracle #切换到hellodb数据库； MariaDB [(none)]> use hellodb; Database changed #先查看teachers表； MariaDB [hellodb]> select * from teachers; +-----+---------------+-----+--------+ | TID | Name | Age | Gender | +-----+---------------+-----+--------+ | 1 | Song Jiang | 45 | M | | 2 | Zhang Sanfeng | 94 | M | | 3 | Miejue Shitai | 77 | F | | 4 | Lin Chaoying | 93 | F | +-----+---------------+-----+--------+ 4 rows in set (0.00 sec) #插入两条新数据； MariaDB [hellodb]> insert into teachers(name,age,gender) values(‘Huang Yaoshi‘,56,‘M‘),(‘Feng Qingyang‘,100,‘M‘); Query OK, 2 rows affected (0.04 sec) Records: 2 Duplicates: 0 Warnings: 0 #再次查看teachers表，观察ID的变化； MariaDB [hellodb]> select * from teachers; +-----+---------------+-----+--------+ | TID | Name | Age | Gender | +-----+---------------+-----+--------+ | 1 | Song Jiang | 45 | M | | 2 | Zhang Sanfeng | 94 | M | | 3 | Miejue Shitai | 77 | F | | 4 | Lin Chaoying | 93 | F | | 5 | Huang Yaoshi | 56 | M | | 7 | Feng Qingyang | 100 | M | +-----+---------------+-----+--------+ 6 rows in set (0.00 sec)
node3节点的ID自增是以奇数为顺序的，说明我们的双主复制架构完成了。
7.配置从服务器节点node6：
拷贝数据
（假如是你完全新安装mysql主从服务器，这个一步就不需要。因为新安装的master和slave有相同的数据）
关停Master服务器，将Master中的数据拷贝到从服务器节点中，使得Master和slave中的数据同步，并且确保在全部设置操作结束前，禁止在Master和slave服务器中进行写操作，使得两数据库中的数据一定要相同！
停止node3节点和node6节点的数据库： # service mysqld stop 删除node6节点的数据库文件： [[email protected] ~]# mkdir /backup [[email protected] ~]# mv /mydata/data/* /backup/ [[email protected] ~]# ls /mydata/data/ 将node3节点的数据库数据全部复制到节点node6： [[email protected] mydata]# scp -p -r data/* node6:/mydata/data/ 记得更改数据库数据目录里的所有权限为mysql： [[email protected] ~]# chown -R mysql:mysql /mydata/data/ 将其中原有的中继日志删除： [[email protected] ~]# rm -rf /mydata/data/relay* 配置完成后启动服务器： # service mysqld start 启动从节点的中继日志： MariaDB [(none)]> change master to master_host=‘172.16.31.20‘,master_user=‘repluser‘,master_password=‘replpass‘,master_log_file=‘mysql-bin.000009‘,master_log_pos=326; 启动中继日志进程； MariaDB [(none)]> start slave; 查看从节点的状态： MariaDB [(none)]> show slave status \G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 172.16.31.20 Master_User: repluser Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000009 Read_Master_Log_Pos: 326 Relay_Log_File: relay-bin.000002 Relay_Log_Pos: 535 Relay_Master_Log_File: mysql-bin.000009 Slave_IO_Running: Yes Slave_SQL_Running: Yes 信息略。。。 查看从节点的数据跟主节点是否一致： MariaDB [(none)]> use hellodb; Database changed MariaDB [hellodb]> select * from teachers; +-----+---------------+-----+--------+ | TID | Name | Age | Gender | +-----+---------------+-----+--------+ | 1 | Song Jiang | 45 | M | | 2 | Zhang Sanfeng | 94 | M | | 3 | Miejue Shitai | 77 | F | | 4 | Lin Chaoying | 93 | F | | 5 | Huang Yaoshi | 56 | M | | 7 | Feng Qingyang | 100 | M | +-----+---------------+-----+--------+ 6 rows in set (0.00 sec)
OK，从节点配置完毕；
五.MMM高可用服务器构建
1.如果你是编译安装的mysql-mmm，那么你就需要安装依赖的perl库了
由于我这里是EPEL源提供的mysql-mmm，所以自动解决了依赖问题；建议你也配置好EPEL源后进行安装，非常方便；
mysql-mmm需要依赖的所有文件如下：
dejavu-lgc-sans-mono-fonts.noarch 0:2.30-2.el6 perl-Date-Manip.noarch 0:6.24-1.el6 perl-Email-Date-Format.noarch 0:1.002-5.el6 perl-Log-Dispatch.noarch 0:2.27-1.el6 perl-Log-Dispatch-FileRotate.noarch 0:1.19-4.el6 perl-Log-Log4perl.noarch 0:1.30-1.el6 perl-MIME-Lite.noarch 0:3.027-2.el6 perl-MIME-Types.noarch 0:1.28-2.el6 perl-Mail-Sender.noarch 0:0.8.16-3.el6 perl-Mail-Sendmail.noarch 0:0.79-12.el6 perl-MailTools.noarch 0:2.04-4.el6 perl-Params-Validate.x86_64 0:0.92-3.el6 perl-TimeDate.noarch 1:1.16-13.el6 perl-XML-DOM.noarch 0:1.44-7.el6 perl-XML-RegExp.noarch 0:0.03-7.el6 perl-YAML-Syck.x86_64 0:1.07-4.el6 rrdtool.x86_64 0:1.3.8-7.el6 rrdtool-perl.x86_64 0:1.3.8-7.el6 perl-Algorithm-Diff.noarch 0:1.1902-9.el6 perl-Class-Singleton.noarch 0:1.4-6.el6 perl-DBD-MySQL.x86_64 0:4.013-3.el6 perl-Net-ARP.x86_64 0:1.0.6-2.1.el6 perl-Path-Class.noarch 0:0.25-1.el6 perl-Proc-Daemon.noarch 0:0.14-9.el6 perl-Proc-ProcessTable.x86_64 0:0.48-1.el6
2.mysql-mmm软件包介绍
mysql-mmm软件包包含四个软件：
主软件包： mysql-mmm.noarch 0:2.2.1-2.el6 客户端软件包： mysql-mmm-agent.noarch 0:2.2.1-2.el6 监控软件包： mysql-mmm-monitor.noarch 0:2.2.1-2.el6 工具包： mysql-mmm-tools.noarch 0:2.2.1-2.el6
3.在所有节点安装mysql-mmm的软件包组；
# yum install -y mysql-mmm*
查看安装的后生成的文件：
[[email protected] ~]# rpm -ql mysql-mmm /etc/logrotate.d/mysql-mmm /etc/mysql-mmm /etc/mysql-mmm/mmm_common.conf /usr/share/doc/mysql-mmm-2.2.1 /usr/share/doc/mysql-mmm-2.2.1/COPYING /usr/share/doc/mysql-mmm-2.2.1/INSTALL /usr/share/doc/mysql-mmm-2.2.1/README /usr/share/doc/mysql-mmm-2.2.1/VERSION /usr/share/doc/mysql-mmm-2.2.1/mysql-mmm-2.2.1.pdf /usr/share/perl5/vendor_perl/MMM/Common /usr/share/perl5/vendor_perl/MMM/Common/Angel.pm /usr/share/perl5/vendor_perl/MMM/Common/Config.pm /usr/share/perl5/vendor_perl/MMM/Common/Log.pm /usr/share/perl5/vendor_perl/MMM/Common/PidFile.pm /usr/share/perl5/vendor_perl/MMM/Common/Role.pm /usr/share/perl5/vendor_perl/MMM/Common/Socket.pm /usr/share/perl5/vendor_perl/MMM/Common/Uptime.pm /var/lib/mysql-mmm /var/log/mysql-mmm /var/run/mysql-mmm
4.在node3和node4两个主服务器节点配置mmm代理和监控账号的权限
#前面已经执行过了，就不用执行了，让复制，monitor使用同一个用户，注意权限就可以行了。 MariaDB [(none)]> grant replication client,replication slave on *.* to ‘repluser‘@‘172.16.%.%‘ identified by ‘replpass‘; MariaDB [(none)]> grant super,replication client,replication slave,process on *.* to ‘mmm_agent‘@‘172.16.%.%‘ identified by ‘agent_password‘; MariaDB [(none)]> flush privileges; 在node3和node4节点都执行一遍；
5.配置mysql-mmm的配置文件；
所有的配置选项都集合在了一个叫/etc/mysql-mmm/mmm_common.conf的单独文件中，系统中所有主机的该文件内容都是一样的, 配置完后不要忘记了拷贝这个文件到所有的主机（包括监控主机）！，内容如下：
[[email protected] ~]# cat /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 repluser #复制授权帐号 replication_password replpass #复制授权密码 agent_user mmm_agent #mmm-agent的帐号 agent_password agent_password #mmm-agent的密码 </host> #定义数据库节点 <host db1> ip 172.16.31.20 mode master peer db2 </host> <host db2> ip 172.16.31.21 mode master peer db1 </host> <host db3> ip 172.16.31.23 mode slave </host> #可写角色主机节点 <role writer> hosts db1, db2 ips 172.16.31.100 #互斥角色只有一个ip，并且同一时间只能分配给一个主机，你可以指定一个优先(preferred)主机，如果这个主机是ONLINE状态，那么角色就会被切换到这个主机。 mode exclusive </role> #可读角色主机节点 <role reader> hosts db1, db2, db3 ips 172.16.31.101,172.16.31.102,172.16.31.103 #负载均衡角色可以有多个IP，这些IP被均衡的分配给多个主机，所以没有一个主机可以比其他主机多出两个角色。 mode balanced </role>
配置完成后复制到所有节点，包括监控节点node5；
在数据库主机上我们需要编辑/etc/mysql-mmm/mmm_agent.conf文件，根据其他主机的不同更改db1的值（db2就将db1更改成db2，db3就将db1改为db3）：
[[email protected] ~]# 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
在监控主机上我们需要编辑/etc/mysql-mmm/mmm_mon.conf文件：
[[email protected] ~]# 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 #监控的数据库服务器的IP ping_ips 172.16.31.20,172.16.31.21,172.16.31.23 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> #数据库服务器授权监控的用户名和密码； monitor_user repluser monitor_password replpass </host> debug 0
6.配置完成后，启动监控服务，在监控主机上启动：
[[email protected] ~]# /etc/init.d/mysql-mmm-monitor start Starting MMM Monitor Daemon: [ OK ] 查看进程启动情况： [[email protected] ~]# ps aux |grep mmm root 2325 0.0 1.3 161564 13608 ? S 19:29 0:00 mmm_mond root 2326 3.3 6.6 698592 67780 ? Sl 19:29 0:00 mmm_mond root 2339 1.7 0.9 150600 10044 ? S 19:29 0:00 perl /usr/libexec/mysql-mmm/monitor/checker ping_ip root 2343 2.2 1.1 181676 11920 ? S 19:29 0:00 perl /usr/libexec/mysql-mmm/monitor/checker mysql root 2346 1.8 0.9 150600 10044 ? S 19:29 0:00 perl /usr/libexec/mysql-mmm/monitor/checker ping root 2349 2.5 1.1 181676 11960 ? S 19:29 0:00 perl /usr/libexec/mysql-mmm/monitor/checker rep_backlog root 2352 3.0 1.1 181676 11976 ? S 19:29 0:00 perl /usr/libexec/mysql-mmm/monitor/checker rep_threads root 2355 0.0 0.0 103256 832 pts/0 S+ 19:29 0:00 grep mmm
7.在数据库服务器节点上启动agent服务；node3，node4，node6节点都需要执行：
[[email protected] ~]# /etc/init.d/mysql-mmm-agent start Starting MMM Agent Daemon: [ OK ] [[email protected] ~]# /etc/init.d/mysql-mmm-agent start Starting MMM Agent Daemon: [ OK ] [[email protected] ~]# /etc/init.d/mysql-mmm-agent start Starting MMM Agent Daemon: [ OK ]
在节点上查看进程及监听端口状态：
就拿node6举例了：
[[email protected] ~]# ps aux |grep mmm root 12821 0.0 0.9 149664 10044 ? S 19:32 0:00 mmm_agentd root 12823 0.1 1.0 149796 10256 ? S 19:32 0:00 mmm_agentd root 12878 0.0 0.0 103252 828 pts/0 S+ 19:33 0:00 grep mmm
查看监听端口：
[[email protected] ~]# netstat -tunlp |grep mmm tcp 0 0 172.16.31.23:9989 0.0.0.0:* LISTEN 12823/mmm_agentd
注意：如果不能启动，可以查看/var/log/mysql-mmm/mmm_agentd.log 文件的提示，或者启动时候的报错，最大的可能是perl对应模块没有安装成功，成功安装对应的模块就可以解决问题了.
8.在监控主机上查看集群节点状态：
[[email protected] ~]# mmm_control mode ACTIVE [[email protected] ~]# mmm_control show db1(172.16.31.20) master/ONLINE. Roles: reader(172.16.31.101), writer(172.16.31.100) db2(172.16.31.21) master/ONLINE. Roles: reader(172.16.31.102) db3(172.16.31.23) slave/ONLINE. Roles: reader(172.16.31.103)
所有节点都处于ONLINE在线状态；
我们的MMM集群搭建就完毕了，我们进行一次健康检查：
[[email protected] ~]# mmm_control checks all db2 ping [last change: 2015/01/25 19:29:41] OK db2 mysql [last change: 2015/01/25 19:29:41] OK db2 rep_threads [last change: 2015/01/25 19:29:41] OK db2 rep_backlog [last change: 2015/01/25 19:29:41] OK: Backlog is null db3 ping [last change: 2015/01/25 19:29:41] OK db3 mysql [last change: 2015/01/25 19:29:41] OK db3 rep_threads [last change: 2015/01/25 19:29:41] OK db3 rep_backlog [last change: 2015/01/25 19:29:41] OK: Backlog is null db1 ping [last change: 2015/01/25 19:29:41] OK db1 mysql [last change: 2015/01/25 19:29:41] OK db1 rep_threads [last change: 2015/01/25 19:29:41] OK db1 rep_backlog [last change: 2015/01/25 19:29:41] OK: Backlog is null
监控节点的集群节点健康检查都是成功的，我们的MMM集群是成功的。
9.集群的故障切换测试：
测试看两个mysql服务器能否实现故障自动切换
停掉作为写的db1上的mysql，查看写的服务器会不会自动转移到db2上去
[[email protected] ~]# service mysqld stop Shutting down MySQL.. [ OK ] 停掉几秒钟后用mmm_control show查看： [[email protected] ~]# mmm_control show db1(172.16.31.20) master/HARD_OFFLINE. Roles: db2(172.16.31.21) master/ONLINE. Roles: reader(172.16.31.102), writer(172.16.31.100) db3(172.16.31.23) slave/ONLINE. Roles: reader(172.16.31.101), reader(172.16.31.103)
我们可以看到已经把db2当作主写服务器；
再来看看db1恢复后会是什么情况：
[[email protected] ~]# service mysqld start Starting MySQL. [ OK ] [[email protected] ~]# mmm_control show db1(172.16.31.20) master/ONLINE. Roles: reader(172.16.31.103) db2(172.16.31.21) master/ONLINE. Roles: reader(172.16.31.102), writer(172.16.31.100) db3(172.16.31.23) slave/ONLINE. Roles: reader(172.16.31.101)
我们可以看到当db1恢复后就充当slave的角色了！只有当db2挂了以后db1又会担当起主服务器的写入功能
10.测试写入数据是否同步
在mmm-monitor上连接172.16.31.21，尝试写入数据，然后查看三个服务器是否同步数据。
[[email protected] ~]# mysql -uroot -poracle -h172.16.31.21 Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 613 Server version: 5.5.5-10.0.12-MariaDB-log Source distribution Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. #查看数据库； mysql> show databases; +--------------------+ | Database | +--------------------+ | binlog | | hellodb | | information_schema | | mysql | | performance_schema | | relaylog | | test | +--------------------+ 7 rows in set (0.00 sec) #使用hellodb数据库； mysql> use hellodb; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed #查看teachers表； mysql> select * from teachers; +-----+---------------+-----+--------+ | TID | Name | Age | Gender | +-----+---------------+-----+--------+ | 1 | Song Jiang | 45 | M | | 2 | Zhang Sanfeng | 94 | M | | 3 | Miejue Shitai | 77 | F | | 4 | Lin Chaoying | 93 | F | | 5 | Huang Yaoshi | 56 | M | | 7 | Feng Qingyang | 100 | M | +-----+---------------+-----+--------+ 6 rows in set (0.00 sec) #插入一些数据； mysql> insert into teachers(name,age,gender) values(‘Wang Chongyang‘,95,‘m‘); Query OK, 1 row affected (0.04 sec) #查看数据修改情况； mysql> select * from teachers; +-----+----------------+-----+--------+ | TID | Name | Age | Gender | +-----+----------------+-----+--------+ | 1 | Song Jiang | 45 | M | | 2 | Zhang Sanfeng | 94 | M | | 3 | Miejue Shitai | 77 | F | | 4 | Lin Chaoying | 93 | F | | 5 | Huang Yaoshi | 56 | M | | 7 | Feng Qingyang | 100 | M | | 8 | Wang Chongyang | 95 | M | +-----+----------------+-----+--------+ 7 rows in set (0.00 sec) #退出数据库； mysql> \q Bye
我们在节点node3上查看数据是否同步：
[[email protected] ~]# mysql -uroot -poracle Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 229 Server version: 10.0.12-MariaDB-log Source distribution Copyright (c) 2000, 2014, Oracle, SkySQL Ab and others. Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. MariaDB [(none)]> use hellodb; Database changed MariaDB [hellodb]> select * from teachers; +-----+----------------+-----+--------+ | TID | Name | Age | Gender | +-----+----------------+-----+--------+ | 1 | Song Jiang | 45 | M | | 2 | Zhang Sanfeng | 94 | M | | 3 | Miejue Shitai | 77 | F | | 4 | Lin Chaoying | 93 | F | | 5 | Huang Yaoshi | 56 | M | | 7 | Feng Qingyang | 100 | M | | 8 | Wang Chongyang | 95 | M | +-----+----------------+-----+--------+ 7 rows in set (0.00 sec) MariaDB [hellodb]> \q Bye
在从服务器节点node6查看数据是否同步：
[[email protected] ~]# mysql -uroot -p Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 645 Server version: 10.0.12-MariaDB-log Source distribution Copyright (c) 2000, 2014, Oracle, SkySQL Ab and others. Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. MariaDB [(none)]> use hellodb; Database changed MariaDB [hellodb]> select * from teachers; +-----+----------------+-----+--------+ | TID | Name | Age | Gender | +-----+----------------+-----+--------+ | 1 | Song Jiang | 45 | M | | 2 | Zhang Sanfeng | 94 | M | | 3 | Miejue Shitai | 77 | F | | 4 | Lin Chaoying | 93 | F | | 5 | Huang Yaoshi | 56 | M | | 7 | Feng Qingyang | 100 | M | | 8 | Wang Chongyang | 95 | M | +-----+----------------+-----+--------+ 7 rows in set (0.00 sec) MariaDB [hellodb]> \q Bye
数据全部同步了，我们的MMM集群是完美成功了的。
至此，基于Master-Master replication manager for Mysql的高可用双主复制集群搭建完毕。
有关MMM的文档，可以查看http://isadba.com/此网站的大神翻译的文档，很不错，关于配置方面的选项这个翻译中都介绍的很详细了，我就不在这里叙述了。
我也把文档放在附件里了，如果需要可以去下载。
时间： 2024-11-14 22:25:43