實驗系統：CentOS 6.6_x86_64
實驗前提：防火牆和selinux都關閉
實驗說明：本實驗共有5台主機，IP分配如拓撲
實驗軟件：mariadb-10.0.20 mysql-mmm-2.2.1 mysql-mmm-monitor-2.2.1 mysql-mmm-agent-2.2.1
下載地址：http://pan.baidu.com/s/1bnnYiMr
實驗拓撲：
一、准備工作
1.根據下表，將各主機名進行修改：
2.修改hosts文件，添加如下內容：
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.規划虛擬ip，列表如下：
二、安裝mariadb並配置
1.在db1-4上安裝：
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.編輯配置文件：
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上創建用戶：
這里需要創建三個用戶，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.查看二進制日志位置：
FLUSH TABLES WITH READ LOCK; //施加鎖 SHOW MASTER STATUS; +-------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +-------------------+----------+--------------+------------------+ | mysql1-bin.000004 | 936 | | | +-------------------+----------+--------------+------------------+
5.不要關閉這個mysql進程連接，避免鎖失效，我們另起一個ssh連接db1服務器，進行數據庫備份：
/usr/local/mysql/bin/mysqldump --all-databases > /tmp/database-backup.sql
6.回到剛才mysql進程，進行解鎖：
UNLOCK TABLES;
7.將database-backup.sql文件復制到其他db節點：
scp /tmp/database-backup.sql db2:/tmp/ scp /tmp/database-backup.sql db3:/tmp/ scp /tmp/database-backup.sql db4:/tmp/
8.db2-4主機導入sql文件，並刷新權限：
/usr/local/mysql/bin/mysql < /tmp/database-backup.sql
/usr/local/mysql/bin/mysql
------------------------------------------------->
FLUSH PRIVILEGES;
三、設置復制
1.在db2-4上操作，將db1設置為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.查看狀態：
SHOW SLAVE STATUS\G
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，將db2設置為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 STATUS\G
四、安裝MMM
1.創建用戶：
useradd -s /sbin/nologin mmmd
2.在mon上安裝：
yum -y install mysql-mmm-monitor
3.在db1-4上安裝：
yum -y install mysql-mmm-agent
4.編寫配置文件，五台主機必須一致：
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 //用於復制的用戶 replication_password 123456 //復制用戶的密碼 agent_user mmm_agent //用於改變模式的用戶 agent_password 123456 //改變模式用戶的密碼 </host> <host db1> ip 192.168.19.66 mode master peer db2 //需要監視的“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 //可寫節點 ips 192.168.19.150 //寫操作使用的VIP mode exclusive //排他模式，此處資源同一時間只能分配給一個主機 </role> <role reader> hosts db1, db2, db3, db4 //可讀節點 ips 192.168.19.151, 192.168.19.152, 192.168.19.153, 192.168.19.154 //讀操作使用的VIP mode balanced //平衡模式 </role>
5.在db1-4上修改mmm_agent.conf，只需要修改db1這里，是哪台就改成哪台，這里只給出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 //只改這里
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
//用於測試網絡可用性的IP地址，其中有一個地址能ping通，就代表網絡正常，不要寫入本機的ip地址 auto_set_online 60 //是否設置自動上線，如果該值大於0，抖動的主機在抖動的時間范圍過后，則設置自動上線 # 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 //用於監控的用戶 monitor_password 123456 //監控用戶的密碼 </host> debug 0
五、啟動測試：
1.在db1-4上啟動agents：
chkconfig mysql-mmm-agent on
service mysql-mmm-agent start
2.在mon上啟動monitor：
vim /etc/default/mysql-mmm-monitor ---------------------------------------------------> ENABLED=1
<---------------------------------------------------
service mysql-mmm-monitor start
3.檢查集群狀態：
mmm_control show
如果服務器狀態不是ONLINE，可以用如下命令將服務器上線，例如：
mmm_control set_online db1
4.從剛才圖片可以看到，寫請求的VIP在db1上，所有從節點也都把db1當做主節點。下面將db1停掉：
service mysqld stop //停掉db1的mysql服務
可以看到寫請求的VIP已經轉移到db2上了，且從節點的主都指向了db2：
5.最后開啟db3、db4的只讀：
vim /etc/my.cnf -------------------------------> [mysqld] read_only = 1
<-------------------------------
service mysqld restart
到此為止，所有的配置都完成了。一個writer的VIP和四個reader的VIP都已經正常分配，大家可以創建一個遠程登錄賬號進行測試，這里就不再給出具體的過程了。由於時間緊迫，且經驗有限，配置過程中可能會出現紕漏，如有發現請及時聯系我，歡迎大家的指正，謝謝！ 聯系QQ：82800542