keepalived相关配置示例(二)

虚拟服务器配置实验：

两台centos6主机为web service系统为CentOS6.8  n1:172.16.253.87    n2:172.16.252.5都安装httpd    yum install -y httpd[root@n1 ~]#vim /var/www/html/index.html<h1>Real Server 1</h1>[root@n1 ~]#service httpd start[root@n2 ~]#vim /var/www/html/index.html<h1>RealServer 2</h1>[root@n1 ~]#service httpd start#!/bin/bash##vip='172.16.0.99'netmask='255.255.255.255'iface='lo:0' case $1 instart)        echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore        echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore        echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce        echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce         ifconfig $iface $vip netmask $netmask broadcast $vip up        route add -host $vip dev $iface        ;;stop)        ifconfig $iface down         echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore        echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore        echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce        echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce        ;;*)        exit 1esac[root@n1 ~]#bash -x setrs.sh start[root@n1 ~]#route -n172.16.0.99     0.0.0.0         255.255.255.255 UH    0      0        0 lo[root@n1 ~]#scp setrs.sh 172.16.252.5:/root[root@n2 ~]#bash -x setrs.sh start[root@n2 ~]#route -n172.16.0.99     0.0.0.0         255.255.255.255 UH    0      0        0 lo [root@node1 ~]#yum -y install nginx[root@node1 ~]#systemctl start nginx.service[root@node2 ~]#yum -y install nginx[root@node2 ~]#systemctl start nginx.service[root@node1 ~]#yum install -y ipvsadm[root@node1 /etc/keepalived]#vim keepalived.confvirtual_server 172.16.0.99 80 {        delay_ loop 1   服务轮询的时间间隔        lb_algo wrr 定义调度方法        lb_kind DR  集群的类型        protocol TCP 服务协议，仅支持TCP        sorry_server 127.0.0.1 80   备用服务器地址        real_server 172.16.252.5 80 {                weight 1                HTTP_GET {                    url {   定义当前主机的健康状态检测方法                        path /index.html 定义要监控的URL                        status_code 200 判断上述检测机制为健康状态的响应码                    }                       nb_get_retry 3  重试次数                    delay_before_retry 2    重试之前的延迟时长                    connect_timeout 3   连接请求的超时时长                }        }        real_server 172.16.252.5 80 {                weight 1                HTTP_GET {                    url {                        path /index.html                        status_code 200                    }                       nb_get_retry 3                    delay_before_retry 2                    connect_timeout 3                }           }       }       [root@node2 /etc/keepalived]#vim keepalived.conf    做同上操作测试：[root@node1 /etc/keepalived]#systemctl stop keepalived.service[root@node2 /etc/keepalived]#curl http://172.16.0.99<h1>Real Server 1</h1>[root@node2 /etc/keepalived]#curl http://172.16.0.99<h1>RealServer 2</h1>[root@node2 /etc/keepalived]#curl http://172.16.0.99<h1>Real Server 1</h1>[root@node2 /etc/keepalived]#curl http://172.16.0.99<h1>RealServer 2</h1>[root@node1 /etc/keepalived]#systemctl start keepalived.service[root@node1 /etc/keepalived]#ipvsadm -ln  -> 172.16.252.5:80              Route   1      0          2           -> 172.16.253.87:80             Route   1      0          2         [root@node2 /etc/keepalived]#ipvsadm -ln  -> 172.16.252.5:80              Route   1      0          0           -> 172.16.253.87:80             Route   1      0          0       [root@n1 ~]#service httpd stop[root@node1 /etc/keepalived]#ipvsadm -ln  -> 172.16.252.5:80              Route   1      0          0    [root@n1 ~]#service httpd start   [root@n2 ~]#service httpd stop[root@node2 /etc/keepalived]#ipvsadm -ln  -> 172.16.253.87:80             Route   1      0          0   

TCP_CHECK使用示例：

[root@node1 /etc/keepalived]#vim keepalived.confvirtual_server 172.16.0.99 80 {        delay_ loop 1        lb_algo wrr        lb_kind DR        protocol TCP        sorry_server 127.0.0.1 80         real_server 172.16.253.87 80 {                weight 1                HTTP_GET {                    url {                        path /index.html                        status_code 200                    }                    nb_get_retry 3                    delay_before_retry 2                    connect_timeout 3                }        }        real_server 172.16.252.5 80 {                weight 1                TCP_CHECK {                    nb_get_retry 3                    delay_before_retry 2                    connect_timeout 3                }        }}