Keepalived+Mysql(2主2从架构)

利用keepalived构建高可用MySQL-HA，保证两台MySQL数据的一致性，然后用keepalived实现虚拟IP，通过keepalived自带的服务监控功能来实现MySQL故障时自动切换。

　使用MySQL双master+keepalived是一种非常好的解决方案，在MySQL-HA环境中，MySQL互为主从关系，这样就保证了两台MySQL数据的一致性，然后用keepalived实现虚拟IP，通过keepalived自带的服务监控功能来实现MySQL故障时自动切换。　　下面，我把即将上线的一个生产环境中的架构与大家分享一下，看一下这个架构中，MySQL-HA是如何实现的，环境拓扑如下



一、安装keepalived

(1)源码编译安装wget http://www.keepalived.org/software/keepalived-1.1.17.tar.gzuname -r (查看内核版本，下面的要和查看到的内核版本一样)ln -s/usr/src/kernels/2.6.32-358.23.2.el6.x86_64/ /usr/src/linux (如果/usr/src/kernels下面没有内容，可使用yum-y install kernel-devel安装即可)2)安装依赖包yum -y install openssl-devel librarie* popt-devel3)安装主要软件tar -zxvf ipvsadm-1.24.tar.gzcd ipvsadm-1.24make && make installcd ..tar -zxvf keepalived-1.1.17.tar.gzcd keepalived-1.1.17./configuremake && make install编译的时候出现这个提示，说明keepalived和内核结合了，如果不是这样的，需要加上这个参数./configure --with-kernel-dir=/kernel/pathKeepalived configuration------------------------Keepalived version : 1.1.17Compiler : gccCompiler flags : -g -O2Extra Lib : -lpopt -lssl -lcrypto UseIPVS Framework : YesIPVS sync daemon support : YesUse VRRP Framework : YesUse LinkWatch : NoUse Debug flags : No (2)yum配置安装yum -y install ipvsadmyum -y install keepalived进行安装即可，用yum安装完直接进行修改配置文件即可
keepalived-master配置 vi /etc/keepalived/keepalived.conf

!Configuration File for keepalived

global_defs {
router_id LVS_DEVEL
}
# VIP1
vrrp_instance VI_1 {
state MASTER
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 60
priority 100
advert_int 5

authentication {
auth_type PASS
auth_pass 1122
}

virtual_ipaddress {
192.168.40.170
}
}
virtual_server 192.168.40.170 3306 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 60
protocol TCP

real_server 192.168.40.131 3306 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
eal_server 192.168.40.132 3306 {
# weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}

keepalived-backup配置

!Configuration File for keepalived

global_defs {
router_id LVS_DEVEL
}
# VIP1
vrrp_instance VI_1 {
state  BACKUP
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 60
priority 90
advert_int 5

authentication {
auth_type PASS
auth_pass 1122
}

virtual_ipaddress {
192.168.40.170
}
}
virtual_server 192.168.40.170 3306 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 60
protocol TCP

real_server 192.168.40.131 3306 {
# weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
real_server 192.168.40.132 3306 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}

二、mysql主从配置（可以参考我的博客）

# 主服务器上
[mysqld]
server-id = 10
log-bin = mysql-bin
relay-log = relay-mysql
relay-log-index = relay-mysql.index
auto-increment-increment = 2
auto-increment-offset = 1

# 从服务器上
[mysqld]
server-id = 20
log-bin = mysql-bin
relay-log = relay-mysql
relay-log-index = relay-mysql.index
auto-increment-increment = 2
auto-increment-offset = 2

3、如果此时两台服务器均为新建立，且无其它写入操作，各服务器只需记录当前自己二进制日志文件及事件位置，以之作为另外的服务器复制起始位置即可

server1|mysql> SHOW MASTER STATUS\G
************************** 1. row ***************************
File: mysql-bin.000001
Position: 710
Binlog_Do_DB:
Binlog_Ignore_DB:
1 row in set (0.00 sec)

server2|mysql> SHOW MASTER STATUS\G
mysql> SHOW MASTER STATUS\G
*************************** 1. row ***************************
File: mysql-bin.000003
Position: 811
Binlog_Do_DB:
Binlog_Ignore_DB:
1 row in set (0.00 sec)

4、各服务器接下来指定对另一台服务器为自己的主服务器即可：
server1|mysql> CHANGE MASTER TO ...,MASTER_LOG_FILE='mysql-bin.000003', MASTER_LOG_POS=811

server2|mysql> CHANGE MASTER TO ...,MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=710





测试myql集群故障
用vip 192.168.40.170 链接




停止启动一台mysql数据库测试



测试mysql 连接：




查看ipvsadm -L -n




以上就是k+M 高可用。结构需要用脚本调试。