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【實驗環境】

• Centos 7.2
• Nginx?

以下為本次試驗所使用的地址：

• VIP：192.168.136.100
• LVS-1：192.168.136.170
• LVS-2：192.168.136.166

【安裝】

在兩個節點上安裝lvs、keepalived（提前已經安裝好nginx）

yum install ipvsadm keepalived -y

設置配置腳本

vim ipvsadm.sh

#!/bin/bashvip=192.168.136.100 ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up route add -host $vip dev 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 sysctl -p >/dev/null 2>&1

執行腳本（在兩臺lvs主機上執行腳本）

sh ipvsadm.sh

查看是否設置成功

[root@localhost /]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft forever inet 192.168.136.100/32 brd 192.168.136.100 scope global lo:0valid_lft forever preferred_lft foreverinet6 ::1/128 scope host valid_lft forever preferred_lft forever

【設置Keepalived】

主節點（Master），清空文件內容

vim?/etc/keepalived/keepalived.conf??

global_defs{router_id LVS_DEVEL } vrrp_instance VI_1 {state MASTERinterface ens33virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.136.100} }virtual_server 192.168.136.100 80 {delay_loop 6lb_algo rrlb_kind DRpersistence_timeout 0protocol TCPreal_server 192.168.136.170 80 {weight 1TCP_CHECK {connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}}real_server 192.168.136.166 80 {weight 1TCP_CHECK {connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}} }

從節點（Backup），清空文件內容

vim?/etc/keepalived/keepalived.conf??

global_defs{router_id LVS_DEVEL } vrrp_instance VI_1 {state BACKUPinterface ens33virtual_router_id 51priority 99advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.136.100} }virtual_server 192.168.136.100 80 {delay_loop 6lb_algo rrlb_kind DRpersistence_timeout 0protocol TCPreal_server 192.168.136.170 80 {weight 1TCP_CHECK {connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}}real_server 192.168.136.166 80 {weight 1TCP_CHECK {connect_timeout 10nb_get_retry 3delay_before_retry 3connect_port 80}} }

主節點和從節點的區別

主節點：MASTER 從節點：BACKUP state MASTER -> state BACKUP主節點優先級：100 從節點優先級：99 priority 100 -> priority 90另外：注意interface ens33，其中ens33是網卡名稱，根據自己主機情況進行修改

開啟路由轉發

一次性開啟： echo "1">/proc/sys/net/ipv4/ip_forward永久性開啟： vim /etc/sysctl.conf #添加 net.ipv4.ip_forward=1 退出保存#配置生效 sysctl -p

啟動Keepalived（先主后從順序開啟）

systemctl start keepalived.service

查看是否開啟成功

[root@localhost /]# ipvsadm -ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.136.100:80 rr-> 192.168.136.166:80 Route 1 0 0 -> 192.168.136.170:80 Route 1 0 0

打開瀏覽器輸入VIP地址查看，是否成功，如果訪問成功嘗試斷開其中某臺，看是否會自動切換另外一臺服務器進行訪問。

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轉載于:https://www.cnblogs.com/willamwang/p/11364972.html

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