实现目标：

1. 一台LVS通过DR模式将请求负载均衡到两台http服务上
2. 两台Keepalived实现LVS的HA

1 一台LVS实现负载均衡

需要三台虚拟机：node01 和 node02 作为web server, node03 作为流量入口，分发到web server 上

# node01 ip: 10.0.0.6
# node02 ip: 10.0.0.7
systemctl firewall stop
yum install httpd -y
echo "<h1>form node01</h1>" > /var/www/html/index.html
echo 1 > /proc/sys/net/ipv4/conf/ens33/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/ens33/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
ifconfig lo:1 10.0.0.200/32
service httpd start
curl 10.0.0.200

# node03  ip: 10.0.0.5
systemctl firewall stop
ifconfig ens33:1 10.0.0.200/24
yum install ipvsadm -y
ipvsadm -A -t 10.0.0.200:80 -s rr
ipvsadm -a -t 10.0.0.200:80 -r 10.0.0.6:80 -g -w 1
ipvsadm -a -t 10.0.0.200:80 -r 10.0.0.7:80 -g -w 1
ipvsadm -ln
curl 10.0.0.200
ipvsadm -lnc

2 Keepalived实现LVS的HA

需要四台虚拟机：node01 和 node02 作为web server, node03 和 node04 作为LVS的主和备实现HA

# node01 ip: 10.0.0.6 同上
# node02 ip: 10.0.0.7 同上

# node03  ip: 10.0.0.4
# node03  ip: 10.0.0.5
systemctl firewall stop
yum install keepalived ipvsadm -y
# edit keepalived.conf
vim keepalived.conf
service keepalived start

• keepalived.conf 配置

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.0.0.200/24 dev ens33 label ens33:1
    }
}

virtual_server 10.0.0.200 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 0
    protocol TCP
    real_server 10.0.0.6 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 10.0.0.7 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}