下载tar包

./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.32-431.el6.x86_64/ \      注意加内核

&&make && make install

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

cp  /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

cp /usr/local/keepalived/sbin/keepalived  /usr/sbin/

cp -r /usr/local/keepalived/etc/keepalived/ /etc   将配置文件 CP可到/etc

架构 192.168.10.129 httpd服务器 连的VIP    192.168.10.128 真实IP 为master   192.168.10.130 真实IP 为bakcup

配置文件  VIP需跟本地IP同一网段且IP未曾使用

master 配置

! Configuration File for keepalived

global_defs {

notification_email {

liu6630@qq.com

}

notification_email_from liu6630@qq.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

lvs_sync_daemon_inteface eth0

virtual_router_id 151

priority 100

advert_int 5

nopreempt

authentication {

auth_type PASS

auth_pass 2222

}

virtual_ipaddress {

192.168.111.111

}

}

virtual_server 192.168.111.111 3306 {

delay_loop 6

lb_algo wrr

lb_kind DR

persistence_timeout 60

protocol TCP

real_server 192.168.10.128 3306 {

weight 100

notify_down /root/shell/mysql_keepalived.sh

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 3306

}

}

BACK_UP 配置

! Configuration File for keepalived

global_defs {

notification_email {

liu6630@qq.com

}

notification_email_from liu6630@qq.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

lvs_sync_daemon_inteface eth0

virtual_router_id 151

priority 100

advert_int 5

nopreempt

authentication {

auth_type PASS

auth_pass 2222

}

virtual_ipaddress {

192.168.111.111

}

}

virtual_server 192.168.111.111 3306 {

delay_loop 6

lb_algo wrr

lb_kind DR

persistence_timeout 60

protocol TCP

real_server 192.168.10.130 3306 {

weight 100

notify_down /root/shell/mysql_keepalived.sh

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 3306

}

}

}

TCP_CHECK  模板只能 检测本机端口    notify_down检测到端口挂了执行 杀死keepalived 脚本

global_defs {

notification_email {

wgkgood@139.com

}

notification_email_from wgkgood@139.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script chk_nginx {

script "/data/sh/nginx.sh"

interval 2

weight 2

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

lvs_sync_daemon_inteface eth0

virtual_router_id 151

priority 90

advert_int 5

authentication {

auth_type PASS

auth_pass 2222

}

track_script {

chk_nginx

}

virtual_ipaddress {

192.168.111.188

}

}

用脚本检测   脚本内容可为

BACKMSG= `ps -C nginx --noheader |wc -l `

if [ $BACKMSG -eq 0 ];then

service keepalived stop

else

exit

fi

notify_master 脚本 放到VRRP实例

URL_CHECK

HTTP_GET

配置文件重启keeeplived

需手动加载 modprobe ip_vs

排错

1.编译是否加了内核 没加内核不会启动检测 加了

2配置文件是否在 /etc/keepalivde 下  cp -r /usr/local/keepalived/etc/keepalived/ /etc                 最终配置文件/etc/keepalived/keepalived.cof

3是否加载modprobe ip_vs   未加载虚拟IP模块 有VIP也不能 其他服务也不能访问VIP

4是否VIP与真实IP同一网段且无IP冲突

5VIP是否起来 可以用 ip addr list 查看

6 virtual_router_id  同一集群的keepalived的主、备机的virtual_router_id 必须相同,取值0-255 但是同一内网中不应有相同virtual_router_id的集群

7 查看/var/messages日志