主主 高可用keepalived应用
* 在两台主备节点编辑keepalived配置文件* 主节点主机上：
```
]# vim /etc/keepalived/keepalived.conf
------------------------------------------------------------------------------
global_defs {
notification_email {
root@localhost
}
notification_email_from kaadmin@magedu.com
smtp_server 172.0.0.1
smtp_connect_timeout 30
router_id node1
vrrp_mcast_group4 224.0.11.18
}
vrrp_script chk_down {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
interval 2
weight -5
}
vrrp_script chk_httpd {
script "killall -0 httpd"
interval 2
weight 5
}
vrrp_instance VI_1 {
state MASTER
interface eno16777736
virtual_router_id 11
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass vHFHLlTA
}
virtual_ipaddress {
172.18.11.7 dev eno16777736 label eno16777736:0
}
track_script {
chk_down
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance VI_2 {
state BACKUP
interface eno16777736
virtual_router_id 12
priority 98
advert_int 1
authentication {
auth_type PASS
auth_pass RHFHLlTA
}
virtual_ipaddress {
172.18.11.77 dev eno16777736 label eno16777736:1
}
track_script {
chk_down
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
```
* 备节点主机上：
```
]# vim /etc/keepalived/keepalived.conf
---------------------------------------------------------------
vrrp_instance VI_1 {
state BACKUP
interface eno16777736
virtual_router_id 11
priority 98
advert_int 1
authentication {
auth_type PASS
auth_pass vHFHLlTA
}
virtual_ipaddress {
172.18.11.7 dev eno16777736 label eno16777736:0
}
track_script {
chk_down
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance VI_2 {
state MASTER
interface eno16777736
virtual_router_id 12
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass RHFHLlTA
}
virtual_ipaddress {
172.18.11.77 dev eno16777736 label eno16777736:1
}
track_script {
chk_down
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
主备节点都关闭keepalived服务；
]# systemctl stop keepalived.service
先启动B备节点的keepalived服务；
]# systemctl start keepalived.service
]# ifconfig
可见有两个VIP的地址都获得了即：
172.18.11.7
172.18.11.77
此时，只有B节点，所以都当做主服务；
再启动A节点的keepalived服务；
]# systemctl start keepalived.service
]# ifconfig
则发现，获得了VIP为172.18.11.7；
在A节点创建一个down文件
]# touch down
]# ifconfig
此时VIP丢失；
在B节点查看：
]# ifconfig
获得成为了两个VIP的主用；
同理，在B节点创建一个down文件，A节点会成为两个VIP的主用；
```
以上演示就是互为主备的高可用keepalived应用
**如果再加上vrrp_script的脚本监控nginx服务，于是这就双主模型的nginx节点；如果nginx工作在反代模式就是高可用调度器；把配置文件中httpd改为nginx，再调用即可；**
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