环境说明:
web1:eth0->192.168.4.100/24
web2:eth0->192.168.4.200/24
# 在两台web服务器上安装keepalived
[root@web1 ~]# yum install -y keepalived httpd
[root@web2 ~]# yum install -y keepalived httpd
# 修改配置文件
[root@web1 ~]# vim /etc/keepalived/keepalived.conf
12 router_id web1 # 设置本机在集群中的唯一识别符
13 vrrp_iptables # 自动配置iptables放行规则
... ...
20 vrrp_instance VI_1 {
21 state MASTER # 状态,主为MASTER,备为BACKUP
22 interface eth0 # 网卡
23 virtual_router_id 51 # 虚拟路由器地址
24 priority 100 # 优先级
25 advert_int 1 # 发送心跳消息的间隔
26 authentication {
27 auth_type PASS # 认证类型为共享密码
28 auth_pass 1111 # 集群中的机器密码相同,才能成为集群
29 }
30 virtual_ipaddress {
31 192.168.4.80/24 # VIP地址
32 }
33 }
# 删除下面所有行
#打开一个新的终端监控日志,新日志将出持续显示在屏幕上。退出按ctrl+c
[root@web1 ~]# tail -f /var/log/messages | grep -i keepalived
# 在前一个终端启动服务
[root@web1 ~]# systemctl start keepalived
# 等几秒服务完全启动后,可以查看到vip
[root@web1 ~]# ip a s eth0 # eth0将会增加额外的4.80地址
# 配置web2
[root@web1 ~]# scp /etc/keepalived/keepalived.conf192.168.4.200:/etc/keepalived/
[root@web2 ~]# vim /etc/keepalived/keepalived.conf
12 router_id web2 # 改id
13 vrrp_iptables
... ...
20 vrrp_instance VI_1 {
21 state BACKUP # 改状态
22 interface eth0
23 virtual_router_id 51
24 priority 80 # 改优先级
25 advert_int 1
26 authentication {
27 auth_type PASS
28 auth_pass 1111
29 }
30 virtual_ipaddress {
31 192.168.4.80/24
32 }
33 }
# 启动服务
[root@web2 ~]# systemctl start keepalived
# 查看地址,eth0不会出现vip
[root@web2 ~]# ip a s eth0
# 测试,现在访问4.80,看到是web1上的内容
[root@client1 ~]# curl http://192.168.4.80/
192.168.2.100
# 在web2上监控日志
[root@web2 ~]# tail -f /var/log/messages | grep -i keepalived
# 关闭web1上的keepalived,观察web2的日志输出
[root@web1 ~]# systemctl stop keepalived.service
# 测试,现在访问4.80,看到是web2上的内容
[root@client1 ~]# curl http://192.168.4.80/
apache web server2
# 在web2上查看vip,可以查看到vip 192.168.4.80