keepalived实现mysql高可用
由于是高可用服务，首先配置高可用服务实现的一些基本条件1)节点名称必须跟uname -n命令的执行结果一致
node1:
# hostname node1
# vim /etc/sysconfig/network
HOSTNAME=node1
node2:
# hostname node2
# vim /etc/sysconfig/network
HOSTNAME=node2
2)节点之间必须通过ssh互信通信
# ssh-keygen -t rsa -f ~/.ssh/id_rsa -P ''
# ssh-copy-id -i .ssh/id_rsa.pub root@202.207.178.7
# ssh-keygen -t rsa -f ~/.ssh/id_rsa -P ''
# ssh-copy-id -i .ssh/id_rsa.pub root@202.207.178.6
3)集群各节点之间时间必须同步
使用ntp服务器同步时间
ntpdate ip(配置了ntp服务的主机地址)
4)配置本地解析：
# vim /etc/hosts
202.207.178.6 node1
202.207.178.7 node2
# scp /etc/hosts node2:/etc/
一、安装keepalived，实现高可用
在主节点上：
1、安装keepalived
# tar xf keepalived-1.2.1.tar.gz
# cd keepalived-1.2.1
# ./configure --with-kernel-dir=/usr/src/kernels/2.6.32-642.11.1.el6.i686/
# make && make install
注意：
可能需要安装此包：
# yum install popt-devel
发现/usr/src/kernels/为空，需要安装内核源码
# yum install kernel-devel
2、配置keepalived
1）设置一个变量
# DIR=/usr/local/
2）执行如下语句，将keepalived的配置文件放置在/etc下相关目录中
# cp $DIR/etc/rc.d/init.d/keepalived/etc/rc.d/init.d/
# cp $DIR/etc/sysconfig/keepalived /etc/sysconfig/ && mkdir -p
/etc/keepalived
# cp $DIR/sbin/keepalived /usr/sbin/
3）为keepalived提供配置文件
# cd /etc/keepalived/
# vim keepalived.conf（添加以下内容）
! Configuration File for keepalived
global_defs {
notification_email {
2663154088@qq.com
}
notification_email_from wgkgood@139.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
# VIP1
vrrp_instance VI_1 {
state MASTER
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 151
priority 100
advert_int 5
#非抢占 nopreempt
authentication {
auth_type PASS
auth_pass 2222
}
virtual_ipaddress {
202.207.178.4
}
}
virtual_server 202.207.178.4 3306 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 202.207.178.6 3306 {
weight 100
notify_down /data/sh/mysql.sh
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
4）启动服务
# /etc/init.d/keepalived restart
# ps -ef | grep keepalived
此时发现服务已经启动！
# tail -fn 100 /var/log/messages
此时发下一直滚屏，是缺少一个模块，下面加载此模块
# modprobe ip_vs
# /etc/init.d/keepalived restart
# tail -fn 100 /var/log/messages
此时一切正常
在从节点上：
配置同主节点，只是在配置文件中修改以下几项即可：
state BACKUP
priority 90
real_server 202.207.178.7 3306
二、配置相关操作,并测试
1、在主从节点上分别添加如下两个文件并授权，实现在一方的数据库down机时停止keepalived,主从角色实现切换
# vim /data/sh/mysql.sh
/etc/init.d/keepalived stop
# chmod +x /data/sh/nginx.sh
2、在主从节点上分别对数据库授权
mysql>grant all on fsy.* to root@'202.207.178.%' identified by '123456';
3、此时就可以开始测试了
1）再启动一台虚拟机，用此虚拟机连接数据库
# mysql -uroot -h202.207.178.4 -p
2）在主节点停止mysql数据库，此时会发现测试节点的数据库依然连接正常！
到此为止，已经使用keepalived实现了mysql高可用！
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