部署准备：
两台CentOS 7主机HA1和HA2
CentOS 7 基于rpm包安装Nginx：
由于Base源中没有Nginx,所以要安装EPEL源，命令如下：
wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -ivh epel-release-latest-7.noarch.rpm
yum repolist ##检查是否已添加至源列表
然后就可以用yum安装相应的rpm包了
主备模型部署开始：
1.两台主机各自安装Nginx，并自行设置好测试页
2.keepalived配置文件示例：
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from admin@ka.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node1
}
/*进程状态探测脚本*/
/*务必要定义在实例之外，再在实例内调用*/
/*且脚本名字尽量不要用完整单词，如check等，我第一次用此名导致脚本执行失败，可用ck,chk等代替为妙*/
vrrp_script ck_nginx {
script "killall -0 nginx"
interval 2
weight -5
}
vrrp_instance VI_1 {
state MASTER
interface eno16777736
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.100 dev eno16777736 label eno16777736:0
}
/*在实例内调用脚本*/
track_script {
ck_nginx
}
}3.开始测试效果：
①现在备节点启用keepalived，显示
②再在主节点开启keepalived,备节点的日志显示
此时，访问nginx的结果是
③在主节点上停止nginx，再次访问服务，结果是HA2，符合需求
主主模型部署开始：
HA1: HA2:
主 备
备 主
HA1配置文件：
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from admin@ka.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node1
}
vrrp_script ck_nginx {
script "killall -0 nginx"
interval 2
weight -5
}
vrrp_instance VI_1 {
state MASTER
interface eno16777736
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.100 dev eno16777736 label eno16777736:0
}
track_script {
ck_nginx
}
}
vrrp_instance VI_2 {
state BACKUP
interface eno16777736
virtual_router_id 52
priority 98
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.111 dev eno16777736 label eno16777736:1
}
track_script {
ck_nginx
}
}HA2配置文件：
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from admin@ka.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node1
}
vrrp_script ck_nginx {
script "killall -0 nginx"
interval 2
weight -5
}
vrrp_instance VI_1 {
state BACKUP
interface eno16777736
virtual_router_id 51
priority 98
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.100 dev eno16777736 label eno16777736:0
}
track_script {
ck_nginx
}
}
vrrp_instance VI_2 {
state MASTER
interface eno16777736
virtual_router_id 52
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.111 dev eno16777736 label eno16777736:1
}
track_script {
ck_nginx
}
}测试开始：
①现在HA2上开启keepalived,效果如下：
②再在HA1上开启，效果是：
③回到HA2，使用ifconfig查看结果是：
注意：
脚本中用到的killall命令如果是最小化安装默认是没有此命令的，需要运行：
yum -y install psmisc