由于mysql没有提供高可用性方案,如果一台数据库down就会影响到业务,为了实现高可用性可以使用hearbeat,这里我使用MMM来提高mysql的高可用性,以提高业务的不中断.
环境:
服务器类型 IP VIP
node1 10.10.1.65 10.10.1.77
node2 10.10.1.58 10.10.1.78
mon 10.10.1.161 10.10.1.79
配置过程:
1.首先要实现node1和node2的双向同步,这个本人博客已经有相关的文章,在这里就不进行说明了
2.安装和配置MMM
3台服务器都要安装MMM安装包,由于要使用到perl模块,所以要进行如下模块的安装
Algorithm::Diff
Proc::Daemon
Time::HiRes
DBI
DBD::mysql
以上模块你可以通过cpan进行安装,也可以去cpan.org网站上去下载相应的安装包,我已经安装好了
MMM下载地址如下:http://code.google.com/p/mysql-master-master/downloads/list,现在
最新的安装是mysql-master-master-1.2.6.tar.gz.
#tar zxvf mysql-master-master-1.2.6.tar.gz
#cd mysql-master-master-1.2.6
#./install.pl
在nod1上的配置:
#cp usr/local/mmm/etc/examples/mmm_agent.conf.example mmm_agent.conf
#vi usr/local/mmm/etc/examples/mmm_agent.conf //这个配置文件的内容很少,直接清空
添加如下的内容
#
# Master-Master Manager config (agent)
#
# Debug mode
debug no //是否开启debug模式
# Paths
pid_path /usr/local/mmm/var/mmmd_agent.pid //进程路径
bin_path /usr/local/mmm/bin //执行命令路径
# Logging setup
log mydebug
file /usr/local/mmm/var/mmm-debug.log //debug日志文件路径
level debug
log mytraps
file /usr/local/mmm/var/mmm-traps.log
level trap
# MMMD command socket tcp-port and ip
bind_port 9989
# Cluster interface
cluster_interface eth0 //真实IP的接口
# Define current server id
this db1
mode master
# For masters
peer db2
# Cluster hosts addresses and access params
host db1
ip 10.10.1.65 //node1的真实IP
port 3306 //数据库端口
user rep_agent //如下创建的mysql用户
password RepAgent //创建mysql用户的密码
host db2
ip 10.10.1.58 //node2的真实IP
port 3306
user rep_agent
password RepAgent
#mysql -u root -p123456
GRANT ALL PRIVILEGES on *.* to 'rep_agent'@'%' identified by 'RepAgent';
GRANT ALL PRIVILEGES on *.* to 'rep_monitor'@'%' identified by
'RepMonitor';
在node2上的配置:
#cp usr/local/mmm/etc/examples/mmm_agent.conf.example mmm_agent.conf
#vi usr/local/mmm/etc/examples/mmm_agent.conf //这个配置文件的内容很少,直接清空
添加如下的内容
#
# Master-Master Manager config (agent)
#
# Debug mode
debug no
# Paths
pid_path /usr/local/mmm/var/mmmd_agent.pid
bin_path /usr/local/mmm/bin
# Logging setup
log mydebug
file /usr/local/mmm/var/mmm-debug.log
level debug
log mytraps
file /usr/local/mmm/var/mmm-traps.log
level trap
# MMMD command socket tcp-port and ip
bind_port 9989
# Cluster interface
cluster_interface eth0
# Define current server id
this db2
mode master
# For masters
peer db1
# Cluster hosts addresses and access params
host db1
ip 10.10.1.65
port 3306
user rep_agent
password RepAgent
host db2
ip 10.10.1.58
port 3306
user rep_agent
password RepAgent
#mysql -u root -p123456
GRANT ALL PRIVILEGES on *.* to 'rep_agent'@'%' identified by 'RepAgent';
GRANT ALL PRIVILEGES on *.* to 'rep_monitor'@'%' identified by
'RepMonitor';
在mon上的配置:
# Master-Master Manager config (monitor)
#
# Debug mode
debug no
# Paths
pid_path /usr/local/mmm/var/mmmd.pid
status_path /usr/local/mmm/var/mmmd.status
bin_path /usr/local/mmm/bin
# Logging setup
log mydebug
file /usr/local/mmm/var/mmm-debug.log
level debug
log mytraps
file /usr/local/mmm/var/mmm-traps.log
level trap
email root@localhost
# MMMD command socket tcp-port
bind_port 9988
agent_port 9989
monitor_ip 127.0.0.1
# Cluster interface
cluster_interface eth0
# Cluster hosts addresses and access params
host db1
ip 10.10.1.65
port 3306
user rep_monitor
password RepMonitor
mode master
peer db2
host db2
ip 10.10.1.58
port 3306
user rep_monitor
password RepMonitor
mode master
peer db1
#
# Define roles
#
active_master_role writer
# Mysql Reader role
role reader
mode balanced
servers db1, db2
ip 10.10.1.77, 10.10.1.78 //这里是虚拟IP
# Mysql Writer role
role writer
mode exclusive
servers db1, db2
ip 10.10.1.79 //这里是虚拟IP
#
# Checks parameters
#
# Ping checker
check ping
check_period 1
trap_period 5
timeout 2
# Mysql checker
# (restarts after 10000 checks to prevent memory leaks)
check mysql
check_period 1
trap_period 2
timeout 2
restart_after 10000
# Mysql replication backlog checker
# (restarts after 10000 checks to prevent memory leaks)
check rep_backlog
check_period 5
trap_period 10
max_backlog 60
timeout 2
restart_after 10000
# Mysql replication threads checker
# (restarts after 10000 checks to prevent memory leaks)
check rep_threads
check_period 1
trap_period 5
timeout 2
restart_after 10000
进行启动以及测试：
在node1和node2上启动mmmd_agent
#mmmd_agent
#netstat -tlnp
tcp 0 0 0.0.0.0:9989 0.0.0.0:* LISTEN 14301/perl
出现9989端口就表示启动正常
在mon上启动mmm_mon
#mmmd_mon
MySQL Multi-Master Replication Manager
Version: 1.2.6
Reading config file: 'mmm_mon.conf'
$VAR1 = {};
在管理节点上（mon）启动db节点：
#mmm_control set_online db1
MySQL Multi-Master Replication Manager
Version: 1.2.6
Config file: mmm_mon.conf
Daemon is running!
Command sent to monitoring host. Result: OK: State of 'db1' changed to ONLINE. Now you can wait some time and check its new roles!
#mmm_control set_online db2
MySQL Multi-Master Replication Manager
Version: 1.2.6
Config file: mmm_mon.conf
Daemon is running!
Command sent to monitoring host. Result: OK: State of 'db2' changed to ONLINE. Now you can wait some time and check its new roles!
查看下节点状态：
#mmm_control show
MySQL Multi-Master Replication Manager
Version: 1.2.6
Config file: mmm_mon.conf
Daemon is running!
===============================
Cluster failover method: AUTO
===============================
Servers status:
db1(10.10.1.65): master/ONLINE. Roles: reader(10.10.1.78;), writer(10.10.1.79;)
db2(10.10.1.58): master/ONLINE. Roles: reader(10.10.1.77;)
看到这个就说明配置没有问题,现在我们来进行切换测试,看切换是否正常,我现在把node1的mysql停止掉然后在看下节点的状态
#mmm_control show
[root@localhost etc]# mmm_control show
MySQL Multi-Master Replication Manager
Version: 1.2.6
Config file: mmm_mon.conf
Daemon is running!
===============================
Cluster failover method: AUTO
===============================
Servers status:
db1(10.10.1.65): master/HARD_OFFLINE. Roles: None
db2(10.10.1.58): master/ONLINE. Roles: reader(10.10.1.77;), reader(10.10.1.78;), writer(10.10.1.79;)
可以看到读写操作都转到了node2机器上了,看来切换没有问题,测试了下,切换需要大概3秒的时间,还算是可以接受的了.
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