Keepalived+MySQL双主架构

l  架构准备

Node1	192.168.15.3
Node2	192.168.15.4
VIP	192.168.15.254

l  软件

MySQL 5.6 Keepalive

yum install gcc python-devel

easy_install mysql-python

l  MySQL配置

node1:

server-id = 033306

log-bin = mysql-bin

binlog-format = row

log-slave-updates = true

gtid-mode = on

enforce-gtid-consistency = true

auto-increment-increment = 2

auto-increment-offset = 1

relay-log = /var/lib/mysql/relay-log-3306

node2:

server-id = 043306

log-bin = mysql-bin

binlog-format = row

log-slave-updates = true

gtid-mode = on

enforce-gtid-consistency = true

auto-increment-increment = 2

auto-increment-offset = 2

relay-log = /var/lib/mysql/relay-log-3306

查看两个UUID

Node1	e05b8b73-fa94-11e4-aa31-000c29b0dac1	show global variables like '%uuid%';
Node2	2e619521-9eb4-11e5-9868-000c295b6358

赋权(node1和node2)

mysql> grant replication slave,replication client on *.* to repluser@'192.168.15.%' identified by 'replpass';

mysql> flush privileges;

备份:

mysqldump -uroot   --opt --default-character-set=utf8 --triggers -R --master-data=2 --hex-blob --single-transaction --no-autocommit --all-databases > all.sql

注(会有一个警告):

Warning: A partial dump from a server that has GTIDs will by default include the GTIDs of all transactions, even those that changed suppressed parts of the database. If you don't want to restore GTIDs, pass --set-gtid-purged=OFF. To make a complete dump, pass --all-databases --triggers --routines --events.

将导出的数据放到node2中(用免秘钥传输过去):

[root@node1 ~]# yum -y install openssh-clients

[root@node2 mysql]# yum -y install openssh-clients

在node1上

[root@node1 ~]# ssh-keygen

[root@node1 ~]# ssh-copy-id 192.168.15.4

传送文件

[root@node1 ~]# scp -rv all.sql 192.168.15.4:/tmp

=================================================

在node2上

[root@node2 mysql]# mysql </tmp/all.sql

在node2上配置连接

mysql> change master to master_host='192.168.15.3',master_port=3306,master_user='repluser',master_password='replpass',master_auto_position=1;

mysql> start slave;

mysql> show slave status\G;

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

Retrieved_Gtid_Set:

Executed_Gtid_Set: e05b8b73-fa94-11e4-aa31-000c29b0dac1:1-2

完成后备份node2的数据同步到node1中

[root@node2 mysql]# ssh-keygen

[root@node2 mysql]# ssh-copy-id 192.168.15.3

[root@node2 mysql]# mysqldump -uroot   --opt --default-character-set=utf8 --triggers -R --master-data=2 --hex-blob --single-transaction --no-autocommit --all-databases > all.sql

[root@node2 mysql]# scp -r all.sql 192.168.15.3:/tmp

在node1上导入

[root@node1 ~]# mysql < /tmp/all.sql

会有一个报错，但可以不理会

RROR 1840 (HY000) at line 24: @@GLOBAL.GTID_PURGED can only be set when @@GLOBAL.GTID_EXECUTED is empty.

mysql> change master to master_host='192.168.15.4',master_port=3306,master_user='repluser',master_password='replpass',master_auto_position=1;

mysql> start slave;

mysql> show slave status\G;

l  同步复制

node1:

mysql> create database ck1;

node2:

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| ck1                |

| mysql              |

| performance_schema |

| test1              |

+--------------------+

5 rows in set (0.00 sec)

查看从库状态

Retrieved_Gtid_Set: e05b8b73-fa94-11e4-aa31-000c29b0dac1:3

Executed_Gtid_Set: 2e619521-9eb4-11e5-9868-000c295b6358:1-2,

e05b8b73-fa94-11e4-aa31-000c29b0dac1:1-3

之前的

Retrieved_Gtid_Set:

Executed_Gtid_Set: e05b8b73-fa94-11e4-aa31-000c29b0dac1:1-2

在node2中创建表

mysql> use ck1;

mysql> create table test(id int unsigned not null primary key auto_increment,test varchar(100));

在node1中查看表的情况

mysql> use ck1;

Database changed

mysql> show tables;

之前的状态

Retrieved_Gtid_Set: 2e619521-9eb4-11e5-9868-000c295b6358:1-2

Executed_Gtid_Set: 2e619521-9eb4-11e5-9868-000c295b6358:1-2,

现在的状态

Retrieved_Gtid_Set: 2e619521-9eb4-11e5-9868-000c295b6358:1-3

Executed_Gtid_Set: 2e619521-9eb4-11e5-9868-000c295b6358:1-3,

e05b8b73-fa94-11e4-aa31-000c29b0dac1:1-3

l  配置keepalived

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

在node1中

[root@node1
~]# cd /etc/keepalived/

[root@node1
keepalived]# cat keepalived.conf

vrrp_script
vs_mysql_82 {

script
"/etc/keepalived/checkMySQL.py -h 127.0.0.1 -P 3306"

interval
15

}

vrrp_instance
VI_82 {

state
BACKUP

nopreempt

interface
eth0

virtual_router_id
82 #同一集群中该数值要相同

priority
100

advert_int
5

authentication
{

auth_type
PASS #Auth 用密码，但密码不要超过8 位

auth_pass
82565387

}

track_script
{

vs_mysql_82

}

virtual_ipaddress
{

192.168.15.254

}

}

checkMySQL.PY内容

#!/usr/bin/python

#coding:
utf-8

#
grant usage on *.* to 'pxc-monitor'@'%' identified by 'showpxc';

import
sys

import
os

import
getopt

import
MySQLdb

import
logging

dbhost='127.0.0.1'

dbport=3306

dbuser='repluser'

dbpassword='replpass'

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|grep
mysqld|grep -v \"grep\"|grep -v \"mysqld_safe\"|wc -l
"

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)

测试连接

[root@node1
keepalived]# /etc/keepalived/checkMySQL.py -h 127.0.0.1 -P 3306

启动keepalived

原有的

[root@node1
~]# 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 00:0c:29:59:d4:9f brd
ff:ff:ff:ff:ff:ff

inet 192.168.15.3/24 brd 192.168.15.255
scope global eth0

inet6 fe80::20c:29ff:fe59:d49f/64 scope
link

valid_lft forever preferred_lft
forever

[root@node1
keepalived]# /etc/init.d/keepalived start

查看messages的日志可以看到

Dec 10
08:17:17 node1 Keepalived_healthcheckers[2383]: Netlink reflector reports IP
192.168.15.254 added

此时的

[root@node1
~]# 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 00:0c:29:59:d4:9f brd
ff:ff:ff:ff:ff:ff

inet 192.168.15.3/24 brd 192.168.15.255
scope global eth0

inet 192.168.15.254/32
scope global eth0

inet6 fe80::20c:29ff:fe59:d49f/64 scope
link

valid_lft forever preferred_lft
forever

启动完毕后，在node1中建一个测试账号

mysql>
grant all privileges on *.* to 'zhangli.xiong'@'%' identified by
'zhangli.xiong';

mysql>
flush privileges;

在本地客户机上连接

测试说明成功

此时添加node2的keepalived的配置文件(跟node1一样)

启动keepalived

[root@node2
keepalived]# 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 00:0c:29:5b:63:58 brd
ff:ff:ff:ff:ff:ff

inet 192.168.15.4/24 brd 192.168.15.255
scope global eth0

inet6 fe80::20c:29ff:fe5b:6358/64 scope
link

valid_lft forever preferred_lft
forever

[root@node2
keepalived]# /etc/init.d/keepalived start

关闭node1的DB服务器

Dec 10
08:30:12 node1 Keepalived_healthcheckers[2383]: Netlink reflector reports IP
192.168.15.254 removed

此时node2中的messages显示

Dec 10
08:30:18 node2 Keepalived_healthcheckers[3950]: Netlink reflector reports IP
192.168.15.254 added

[root@node2
keepalived]# 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 00:0c:29:5b:63:58 brd
ff:ff:ff:ff:ff:ff

inet 192.168.15.4/24 brd 192.168.15.255
scope global eth0

inet 192.168.15.254/32
scope global eth0

inet6 fe80::20c:29ff:fe5b:6358/64 scope
link

valid_lft forever preferred_lft
forever

连接测试发现已经切换到node2