Centos 7.x 设置Lvs+ Keepalived

 

【实验环境】

• Centos 7.2
• Nginx 

以下为本次试验所使用的地址：

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

【安装】

在两个节点上安装lvs、keepalived（提前已经安装好nginx）

yum install ipvsadm keepalived -y

设置配置脚本

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

执行脚本（在两台lvs主机上执行脚本）

sh ipvsadm.sh

查看是否设置成功

[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

【设置Keepalived】

主节点（Master），清空文件内容

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}} }

从节点（Backup），清空文件内容

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}} }

主节点和从节点的区别

主节点：MASTER 从节点：BACKUP state MASTER -> state BACKUP主节点优先级：100 从节点优先级：99 priority 100 -> priority 90另外：注意interface ens33，其中ens33是网卡名称，根据自己主机情况进行修改

开启路由转发

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

启动Keepalived（先主后从顺序开启）

systemctl start keepalived.service

查看是否开启成功

[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

打开浏览器输入VIP地址查看，是否成功，如果访问成功尝试断开其中某台，看是否会自动切换另外一台服务器进行访问。

 

转载于:https://www.cnblogs.com/willamwang/p/11364972.html

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