keepalived + LVS DR 构建高可用负载均衡

本文参考博客: https://blog.csdn.net/Ki8Qzvka6Gz4n450m/article/details/79119665 原博客很详细并正确，重新记录只为方便查找和搭建

一、环境简述 real server1: 192.168.50.207 -----------httpd服务器 real server2: 192.168.50.235 -----------httpd服务器 director server1:192.168.50.232--------lvs dr服务器+ keepalived服务器 director server2:192.168.50.231 -----lvs dr服务器+ keepalived服务器 测试服务器: 192.168.50.208

二、搭建 1 real server1和real server2服务器设置: 分别执行以下脚本 [root@localhost lvs_dir]#cat lvs_dr_rs.sh #!/bin/bash vip=192.168.50.252 ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up route add -host $vip lo:0 echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce 注: httpd的安装和设置省略，参考前面的博客

2. director server1服务器设置: [root@localhost keepalived]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived

global_defs { notification_email { [e-mail] } notification_email_from keepalived@232 smtp_server 192.168.50.232 smtp_connect_timeout 30 router_id 232 ! vrrp_skip_check_adv_addr ! vrrp_strict ! vrrp_garp_interval 0 ! vrrp_gna_interval 0 }

vrrp_instance VI_1 { state MASTER interface ens160 virtual_router_id 111 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.50.252 } }

virtual_server 192.168.50.252 80 { delay_loop 6 lb_algo rr lb_kind DR persistence_timeout 0 protocol TCP

real_server 192.168.50.235 80 {
    weight 1
    TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

real_server 192.168.50.207 80 {
    weight 1
    TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

}

[root@localhost keepalived]# echo 1 > /proc/sys/net/ipv4/ip_forward

3. director server2的搭建类似 只需要将keepalived的配置文件中的内容稍作修改 state MASTER -> state BACKUP priority 100 -> priority 90

4. 启动keepalved服务（director server1和director server2） [root@localhost keepalived]# systemctl start keepalived

三、测试 1 测试负载均衡(208上): [root@localhost ~]# curl 192.168.50.252:80 235 [root@localhost ~]# curl 192.168.50.252:80 207 [root@localhost ~]# curl 192.168.50.252:80 235 [root@localhost ~]# curl 192.168.50.252:80 207 2.测试real server的单点故障问题: 关掉235上的httpd服务，然后在208上测试: [root@localhost ~]# curl 192.168.50.252:80 207 [root@localhost ~]# curl 192.168.50.252:80 207 3.测试director的高可用性 关掉231服务器的keepalived，或者关掉网卡等，再在208上测试 [root@localhost ~]# curl 192.168.50.252:80 235 [root@localhost ~]# curl 192.168.50.252:80 207 [root@localhost ~]# curl 192.168.50.252:80 235 [root@localhost ~]# curl 192.168.50.252:80 207