实验系统：CentOS 6.6_x86_64
实验前提：防火墙和selinux都关闭
实验说明：本实验共有5台主机，IP分配如拓扑
实验软件：mariadb-10.0.20 mysql-mmm-2.2.1 mysql-mmm-monitor-2.2.1 mysql-mmm-agent-2.2.1
下载地址：http://pan.baidu.com/s/1bnnYiMr
实验拓扑：
一、准备工作
1.根据下表，将各主机名进行修改：
2.修改hosts文件，添加如下内容：
vim /etc/hosts -------------------------------------------> 192.168.19.21 mon 192.168.19.66 db1 192.168.19.74 db2 192.168.19.76 db3 192.168.19.79 db4
3.规划虚拟ip，列表如下：
二、安装mariadb并配置
1.在db1-4上安装：
tar xf mariadb-10.0.20-linux-x86_64.tar.gz -C /usr/local/ cd /usr/local/ ln -sv mariadb-10.0.20-linux-x86_64 mysql useradd -r mysql mkdir -pv /mydata/data chown -R mysql.mysql /mydata/data/ cd mysql/ chown -R root.mysql . scripts/mysql_install_db --user=mysql --datadir=/mydata/data/ cp support-files/my-large.cnf /etc/my.cnf cp support-files/mysql.server /etc/init.d/mysqld chkconfig --add mysqld chkconfig mysqld on
2.编辑配置文件：
db1：
vim /etc/my.cnf ---------------------------------------------> [mysqld] server-id = 1 datadir = /mydata/data log-bin = /mydata/data/mysql1-bin binlog_format = ROW relay_log = /mydata/data/relay-log auto-increment-increment = 2 auto-increment-offset = 1 sync_binlog = 1 sync_master_info = 1 sync_relay_log = 1 sync_relay_log_info = 1 max_binlog_size = 100M log_slave_updates = 1
<---------------------------------------------
service mysqld start
db2：
vim /etc/my.cnf ---------------------------------------------> [mysqld] server-id = 2 datadir = /mydata/data log-bin = /mydata/data/mysql2-bin binlog_format = ROW relay_log = /mydata/data/relay-log auto-increment-increment = 2 auto-increment-offset = 2 sync_binlog = 1 sync_master_info = 1 sync_relay_log = 1 sync_relay_log_info = 1 max_binlog_size = 100M log_slave_updates = 1 <--------------------------------------------- service mysqld start
db3：
vim /etc/my.cnf ---------------------------------------------> [mysqld] server-id = 3 datadir = /mydata/data log-bin = /mydata/data/mysql3-bin binlog_format = ROW relay_log = /mydata/data/relay-log sync_binlog = 1 sync_master_info = 1 sync_relay_log = 1 sync_relay_log_info = 1 max_binlog_size = 100M log_slave_updates = 1 <--------------------------------------------- service mysqld start
db4：
vim /etc/my.cnf ---------------------------------------------> [mysqld] server-id = 4 datadir = /mydata/data log-bin = /mydata/data/mysql4-bin binlog_format = ROW relay_log = /mydata/data/relay-log sync_binlog = 1 sync_master_info = 1 sync_relay_log = 1 sync_relay_log_info = 1 max_binlog_size = 100M log_slave_updates = 1 <--------------------------------------------- service mysqld start
3.在db1上创建用户：
这里需要创建三个用户，如下表：
/usr/local/mysql/bin/mysql -------------------------------------------------> GRANT REPLICATION CLIENT ON *.* TO 'mmm_monitor'@'192.168.19.%' IDENTIFIED BY '123456'; GRANT SUPER,REPLICATION CLIENT,PROCESS ON *.* TO 'mmm_agent'@'192.168.19.%' IDENTIFIED BY '123456'; GRANT REPLICATION SLAVE ON *.* TO 'replication'@'192.168.19.%' IDENTIFIED BY '123456'
4.查看二进制日志位置：
FLUSH TABLES WITH READ LOCK; //施加锁 SHOW MASTER STATUS; +-------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +-------------------+----------+--------------+------------------+ | mysql1-bin.000004 | 936 | | | +-------------------+----------+--------------+------------------+
5.不要关闭这个mysql进程连接，避免锁失效，我们另起一个ssh连接db1服务器，进行数据库备份：
/usr/local/mysql/bin/mysqldump --all-databases > /tmp/database-backup.sql
6.回到刚才mysql进程，进行解锁：
UNLOCK TABLES;
7.将database-backup.sql文件复制到其他db节点：
scp /tmp/database-backup.sql db2:/tmp/ scp /tmp/database-backup.sql db3:/tmp/ scp /tmp/database-backup.sql db4:/tmp/
8.db2-4主机导入sql文件，并刷新权限：
/usr/local/mysql/bin/mysql < /tmp/database-backup.sql
/usr/local/mysql/bin/mysql
------------------------------------------------->
FLUSH PRIVILEGES;
三、设置复制
1.在db2-4上操作，将db1设置为db2-4的主：
CHANGE MASTER TO MASTER_HOST='192.168.19.66',MASTER_USER='replication',MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql1-bin.000004',MASTER_LOG_POS=936; START SLAVE;
2.查看状态：
SHOW SLAVE STATUSG
3.查看db2的master日志位置：
SHOW MASTER STATUS; +-------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +-------------------+----------+--------------+------------------+ | mysql2-bin.000001 | 313 | | | +-------------------+----------+--------------+------------------+
4.在db1上操作，将db2设置为db1的主：
CHANGE MASTER TO MASTER_HOST='192.168.19.74',MASTER_USER='replication',MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql2-bin.000001',MASTER_LOG_POS=313; START SLAVE; SHOW SLAVE STATUSG
四、安装MMM
1.创建用户：
useradd -s /sbin/nologin mmmd
2.在mon上安装：
yum -y install mysql-mmm-monitor
3.在db1-4上安装：
yum -y install mysql-mmm-agent
4.编写配置文件，五台主机必须一致：
vim /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 replication //用于复制的用户 replication_password 123456 //复制用户的密码 agent_user mmm_agent //用于改变模式的用户 agent_password 123456 //改变模式用户的密码 </host> <host db1> ip 192.168.19.66 mode master peer db2 //需要监视的“同伴” </host> <host db2> ip 192.168.19.74 mode master peer db1 </host> <host db3> ip 192.168.19.76 mode slave </host> <host db4> ip 192.168.19.79 mode slave </host> <role writer> hosts db1, db2 //可写节点 ips 192.168.19.150 //写操作使用的VIP mode exclusive //排他模式，此处资源同一时间只能分配给一个主机 </role> <role reader> hosts db1, db2, db3, db4 //可读节点 ips 192.168.19.151, 192.168.19.152, 192.168.19.153, 192.168.19.154 //读操作使用的VIP mode balanced //平衡模式 </role>
5.在db1-4上修改mmm_agent.conf，只需要修改db1这里，是哪台就改成哪台，这里只给出db1的：
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 //只改这里
6.配置mon上的mmm_mon.conf：
vim /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 192.168.19.50, 192.168.19.66, 192.168.19.74, 192.168.19.76, 192.168.19.79
//用于测试网络可用性的IP地址，其中有一个地址能ping通，就代表网络正常，不要写入本机的ip地址 auto_set_online 60 //是否设置自动上线，如果该值大于0，抖动的主机在抖动的时间范围过后，则设置自动上线 # 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 //用于监控的用户 monitor_password 123456 //监控用户的密码 </host> debug 0
五、启动测试：
1.在db1-4上启动agents：
chkconfig mysql-mmm-agent on
service mysql-mmm-agent start
2.在mon上启动monitor：
vim /etc/default/mysql-mmm-monitor ---------------------------------------------------> ENABLED=1
<---------------------------------------------------
service mysql-mmm-monitor start
3.检查集群状态：
mmm_control show
如果服务器状态不是ONLINE，可以用如下命令将服务器上线，例如：
mmm_control set_online db1
4.从刚才图片可以看到，写请求的VIP在db1上，所有从节点也都把db1当做主节点。下面将db1停掉：
service mysqld stop //停掉db1的mysql服务
可以看到写请求的VIP已经转移到db2上了，且从节点的主都指向了db2：
5.最后开启db3、db4的只读：
vim /etc/my.cnf -------------------------------> [mysqld] read_only = 1
<-------------------------------
service mysqld restart
到此为止，所有的配置都完成了。一个writer的VIP和四个reader的VIP都已经正常分配，大家可以创建一个远程登录账号进行测试，这里就不再给出具体的过程了。由于时间紧迫，且经验有限，配置过程中可能会出现纰漏，如有发现请及时联系我，欢迎大家的指正，谢谢！ 联系QQ：82800542