keepalived高可用软件
1)VRRP协议,全称Virtual Router Redundancy Protocol,中文名为虚拟路由冗余协议,VRRP的出现是为了解决静态路由的单点故障。
3)VRRP是用过IP多播的方式(默认多播地址(224.0.0.18))实现高可用对之间通信的。
4)工作时主节点发包,备节点接包,当备节点接收不到主节点发的数据包的时候,就启动接管程序接管主节点的资源。备节点可以有多个,通过优先级竞选,但一般Keepalived系统运维工作中都是一对。
准备环境
准备机器lb01 lb02 web01 web02
lb01 lb02 安装软件
yum install keepalived -y
[root@lb01 nginx]# rpm -qa keepalived
keepalived-1.3.5-8.el7_6.x86_64
[root@lb02 ~]# rpm -qa keepalived
keepalived-1.3.5-8.el7_6.x86_64
开启服务并设置开机自启动
lb01:
[root@lb01 nginx]# systemctl start keepalived.service
[root@lb01 nginx]# systemctl enable keepalived.service
lb02:
[root@lb02 ~]# systemctl start keepalived.service
[root@lb02 ~]# systemctl enable keepalived.service
配置文件
#### 将以前的原文件备份
[root@lb01 nginx]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id lb01
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.3/24 dev eth0 label eth0:1
}
}
[root@lb02 nginx]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id lb02
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.3/24 dev eth0 label eth0:1
}
}
###然后去测试用抓包软件看一看
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