基于 MySQL 5.6 keepalived 的双主搭建

基于MySQL 5.6 keepalived 的双主搭建

一、基于环境介绍、

①、环境说明:

mysql [(none)]>select version();
+------------+
| version()  |
+------------+
| 5.6.22-log |
+------------+
1 row in set (0.00 sec)

②、IP说明

Master1 -> 192.168.80.112

Master2 -> 192.168.80.113

Vip 192.168.80.100

二、Keepalived的安装说明

①、

rpm -ivh http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm yum install keepalived
yum install MySQL-python

②、拷贝Keepalived配置文件Keepailved.conf到/etc/keepalived/keepalived.conf(注意脚本后 -h 127.0.0.1 是本机地址)

[root@Master1 ~]# cat /etc/keepalived/keepalived.conf
vrrp_script vs_mysql_113 {
script "/etc/keepalived/checkMySQL.py -h 127.0.0.1 -P 3306"
interval 60
}
vrrp_instance VI_113 {
state BACKUP
nopreempt
interface eth0
virtual_router_id 113     #只能从1-255
priority 100
advert_int 5
authentication {
auth_type PASS
auth_pass 0932313     #密码不要超过8位
}
track_script {
vs_mysql_113
}
virtual_ipaddress {
192.168.80.100
}
}

③、拷贝checkMySQL.py到/etc/keepalived/checkMySQL.py（checkMySQL.py这个脚本是用来确认本地的 MySQL
是否可以连接上去，相当于做了一个Connect ping .）

[root@Master1 ~]# cat /etc/keepalived/checkMySQL.py
#!/usr/bin/python
#coding: utf-8
# grant usage on *.* to 'monitor'@'%' identified by <span style="font-size:10px;">'m0n1tor';</span>

import sys
import os
import getopt
import MySQLdb
import logging

dbhost='localhost'
dbport=3306
dbuser='monitor'
dbpassword='m0n1tor'

def checkMySQL():
global dbhost
global dbport
global dbuser
global dbpassword

shortargs='h:P:'
opts, args=getopt.getopt(sys.argv[1:],shortargs)
for opt, value in opts:
if opt=='-h':
dbhost=value
elif opt=='-P':
dbport=value
#print "host : %s, port: %d, user: %s, password: %s" % (dbhost, int(dbport), dbuser, dbpassword)
db = instanceMySQL(dbhost, dbport, dbuser, dbpassword)
st = db.ishaveMySQL()
#if ( db.connect() != 0 ):
#       return 1
#db.disconnect()
return st

class instanceMySQL:
conn = None
def __init__(self, host=None,port=None, user=None, passwd=None):
self.dbhost= host
self.dbport = int(port)
self.dbuser = user
self.dbpassword = passwd

def ishaveMySQL(self):
cmd="ps -ef | egrep -i \"mysqld\" | grep %s | egrep -iv \"mysqld_safe\" | grep -v grep | wc -l" % self.dbport
mysqldNum = os.popen(cmd).read()
cmd ="netstat -tunlp | grep \":%s\" | wc -l" % self.dbport
mysqlPortNum= os.popen(cmd).read()
#print mysqldNum, mysqlPortNum
if ( int(mysqldNum) <= 0):
print "error"
return 1
if ( int(mysqldNum) > 0 and  mysqlPortNum <= 0):
return 1
return 0

def connect(self):
#       print "in db conn"
#               print "host : %s, port: %d, user: %s, password: %s" % (self.dbhost, self.dbport, self.dbuser, self.dbpassword)
try:
self.conn=MySQLdb.connect(host="%s"%self.dbhost, port=self.dbport,user="%s"%dbuser, passwd="%s"%self.dbpassword)
except Exception, e:
#                       print " Error"
print e
return 1
return 0
def disconnect(self):
if (self.conn):
self.conn.close()
self.conn = None

if __name__== "__main__":
st=checkMySQL()
sys.exit(st)

三、Mysql设置

①、首先Master1、Master2互为主主，配置主主复制的方法我在这就不赘述了，并且都将Mysql运行在3306端口上。

②、创建监控用户：

mysql [(none)]>GRANT REPLICATION CLIENT ON *.* TO 'monitor'@'%' IDENTIFIED BY 'm0n1tor';
Query OK, 0 rows affected (0.00 sec)

mysql [(none)]>flush privileges;
Query OK, 0 rows affected (0.00 sec)

这里的监控用户是与上述checkMYSQL.py 中的账号是一致的。

四、Master1、Master2一起启动mysql实例，并且都开启Keepalived服务。

[root@Master1 ~]# service keepalived start
正在启动 keepalived：                                      [确定]

查看vip有没有起来:

[root@Master1 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether b0:83:fe:68:03:50 brd ff:ff:ff:ff:ff:ff
inet 192.168.80.112/24 brd 192.168.80.255 scope global eth0
inet 192.168.80.100/32 scope global eth0
inet6 fe80::b283:feff:fe68:350/64 scope link
valid_lft forever preferred_lft forever

[root@Master2 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether b0:83:fe:69:6d:e5 brd ff:ff:ff:ff:ff:ff
inet 192.168.80.113/24 brd 192.168.80.255 scope global eth0
inet 192.168.80.100/32 scope global eth0
inet6 fe80::b283:feff:fe69:6de5/64 scope link
valid_lft forever preferred_lft forever

状态全部OK...

五、常见问题

/etc/keepalived/checkMySQL.py -h 192.168.80.113 -P 3306
Traceback (most recent call last):
File "/etc/keepalived/checkMySQL.py", line 8, in <module>
import MySQLdb
File "/usr/local/lib/python2.7/site-packages/MySQLdb/__init__.py", line 19, in <module>
import _mysql
ImportError: libmysqlclient.so.18: cannot open shared object file: No such file or directory

如果出现这种问题的处理办法：

/etc/ld.so.conf.d/mysql-x86_64.conf 中添加

/usr/local/mysql/lib/

ldconfig 后即可。

六、这是我见过的配置相对比较简单也比较高效的Keepalived+双主结构，有兴趣的不妨试试，有问题欢迎留言。

说明