案例要求：一台web服务器宕机后，被keepalived检测到，切换到从服务器第二台备用，使服务正常运行，之后进行排错进行整改第一台机器 准备：
另外在准备好一台可以访问网页的机器便于测试
1. Server端、client端都需要安装keepalived httpd服务 yum install -y httpd keepalived
2. Server端： mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { root@localhost } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id node3.tao.com } vrrp_instance websrv { state MASTER <==指定此节点为 Master 节点 interface br0（修改成本机使用的网卡） <==指定监听的网卡 virtual_router_id 51 priority 100 <==指定优先级,数字越高约优先 advert_int 1 <==心跳监测，单位为 s authentication { auth_type PASS <==设定验证方式 auth_pass 1111 <==设定密码为 1111 } virtual_ipaddress { 192.168.123.250 <==指定 VIP } } 保存后 重启 keepalived服务 之后在/var/www/html/中写一个测试页 vi index.html server.tao.com 保存后 重启httpd服务
3. Client端 mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { root@localhost } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id node4.tao.com } vrrp_instance websrv { state MASTER <==指定此节点为 Master 节点 interface br0（修改成本机使用的网卡） <==指定监听的网卡 virtual_router_id 51 priority 50 <==指定优先级,数字越高约优先 advert_int 1 <==心跳监测，单位为 s authentication { auth_type PASS <==设定验证方式 auth_pass 1111 <==设定密码为 1111 } virtual_ipaddress { 192.168.123.250 <==指定 VIP } } 保存后 重启 keepalived服务 之后在/var/www/html/中写一个测试页 Vi index.html Server.tao.com 保存后 重启httpd服务
4. 测试结果 在server 和client端 keepalived都正常 显示的是server端页面 Server端关闭keepalived模拟宕机 显示的就是client端
