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mysql高可用架构之mysql-mmm配置详解

时间:2015-08-13 07:43:50      阅读:279      评论:0      收藏:0      [点我收藏+]

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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:

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一、准备工作

  1.根据下表,将各主机名进行修改:

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  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:

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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:

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/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 STATUS\G

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  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 STATUS\G

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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

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    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:

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  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

mysql高可用架构之mysql-mmm配置详解

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原文地址:http://www.cnblogs.com/tae44/p/4723369.html

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