lvs负载均衡加keepdalived高可用集群

最新推荐文章于 2023-07-06 17:14:04 发布

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最新推荐文章于 2023-07-06 17:14:04 发布

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本文链接：https://blog.youkuaiyun.com/Sheise/article/details/117195741

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本文介绍了如何使用LVS和Keepalived在两台服务器上创建一个高可用负载均衡集群。通过配置LVS1为主服务器，LVS2为备份服务器，实现当主服务器故障时，从服务器能无缝接管。同时，详细展示了Web服务器的配置和测试过程，确保在主服务器恢复或Web服务器故障时，系统能正常运行。

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lvs1

[root@LVS1 ~]# yum -y install keepalived ipvsadm

[root@LVS1 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

shoujian@163.com

}

notification_email_from fasong@163.com

smtp_server smtp.163.com

smtp_connect_timeout 30

router_id LVS_MASTER

}

vrrp_instance VI_1 {

state MASTER

interface ens32

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.200.254

}

virtual_server 192.168.200.254 80{

delay_loop 6

lb_algo rr

lb_kind DR

protocol TCP

real_server 192.168.200.114 80 {

weight 1

TCP_CHECK {

connect_timeout 10

#nb_get_retry 3

delay_bedore_retry 3

connect_port 80

}

real_server 192.168.200.115 80 {

weight 1

TCP_CHECK {

connect_timeout 10

#nb_get_retry 3

delay_before_retry 3

connect_port 80

}

[root@LVS1 ~]# systemctl start keepalived

LVS2：

[root@LVS2 ~]# yum -y install keepalived ipvsadm

[root@LVS2 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

shoujian@163.com

}

notification_email_from fasong@163.com

smtp_server smtp.163.com

smtp_connect_timeout 30

router_id LVS_BACKUP

}

vrrp_instance VI_1 {

state BACKUP

interface ens32

virtual_router_id 51

priority 99

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.200.254

}

virtual_server 192.168.200.254 80{

delay_loop 6

lb_algo rr

lb_kind DR

protocol TCP

real_server 192.168.200.114 80 {

weight 1

TCP_CHECK {

connect_timeout 10

#nb_get_retry 3

delay_bedore_retry 3

connect_port 80

}

real_server 192.168.200.115 80 {

weight 1

TCP_CHECK {

connect_timeout 10

#nb_get_retry 3

delay_before_retry 3

connect_port 80

}

[root@LVS2 ~]# systemctl start keepalived

二，开启两台web服务器并编写web测试页

Web1：

[root@web1 ~]# rpm -q httpd

httpd-2.4.6-93.el7.centos.x86_64

[root@web1 ~]# systemctl start httpd

[root@web1 ~]# echo "RealServer1" > /var/www/html/index.html

Web2:

[root@Web2 ~]# rpm -q httpd

httpd-2.4.6-93.el7.centos.x86_64

[root@Web2 ~]# systemctl start httpd

[root@Web2 ~]# echo "RealServer2" > /var/www/html/index.html

配置RealServer并执行

Web1:

[root@web1 ~]# vim real.sh

#!/bin/bash

SNS_VIP=192.168.200.254

case "$1" in

start)

ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP

/sbin/route add -host $SNS_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

echo "RealServer Start OK"

;;

stop)

ifconfig lo:0 down

route del $SNS_VIP >/dev/null 2>&1

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

echo "RealServer Stoped"

;;

echo "Usage: $0 {start|stop}"

exit 1

esac

exit 0

[root@web1 ~]# scp real.sh 192.168.200.115:/root

[root@web1 ~]# sh real.sh start

RealServer Start OK

Web2:

[root@web2 ~]# sh real.sh start

RealServer Start OK

用浏览器访问192.168.200.254

当主服务器故障时，从服务器会代替主服务器（从BACKUP->MASTER）

[root@LVS1 ~]# systemctl stop NetworkManager

[root@LVS1 ~]# systemctl stop keepalived

[root@LVS2 ~]# tail -f /var/log/messages

Jul 7 17:31:38 localhost Keepalived_vrrp[71401]: VRRP_Instance(VI_1) Entering BACKUP STATE

===========================================================

Jul 7 17:33:53 localhost Keepalived_vrrp[71401]: VRRP_Instance(VI_1) Transition to MASTER STATE

当主服务器恢复时，LVS2从服务器就又会变为BACKUP

[root@LVS1 ~]# systemctl start keepalived

[root@LVS2 ~]# tail -f /var/log/messages

………………………………………………………………………………………………

Jul 7 17:36:35 localhost Keepalived_vrrp[71401]: VRRP_Instance(VI_1) Entering BACKUP STATE

模拟WEB页面出现错误

当WEB1页面出错时，主服务器上只能看见WEB2的LVS

[root@web1 ~]# systemctl stop httpd

[root@LVS1 ~]# ipvsadm -Ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.200.254:80 rr

-> 192.168.200.115:80 Route 1 1 3

当WEB1修复时，主服务器上又会出现WEB1的LVS

[root@web1 ~]# systemctl start httpd

[root@LVS1 ~]# ipvsadm -Ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.200.254:80 rr

-> 192.168.200.114:80 Route 1 1 3

-> 192.168.200.115:80 Route 1 1 3