linux lvs keepalived 集群 研究现状,Centos7部署LVS+keepalived高可用集群

简介

在生产工作中,后台的服务器并不可能永远都处于正常运行状态,若服务器发生宕机,为了不影响正在进行的业务以及给用户更好的体验,我们可以通过keepalived监控后台服务器运行情况,当有服务器发生故障时,会从把该服务器剔除出LVS转发策略;等到服务器恢复正常后,keepalived也会重新把该服务器加入LVS转发策略中

前期准备

准备三台centos7虚拟机,配置IP地址和hostname,同步时间,关闭防火墙和seLinux,配置IP地址和hostname映射

在node2和node3中部署httpd服务并修改首页内容

hostname

ip

index.html

node1

192.168.29.143

--

node2

192.168.29.142

client2

node3

192.168.29.144

client1

配置LVS负载均衡策略

详情可参考:https://blog.51cto.com/14832653/2501128

[[email protected] ~]# yum install keepalived -y

修改配置文件

[[email protected] ~]# vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

[email protected]

[email protected]

[email protected]

}

notification_email_from [email protected]

smtp_server 192.168.200.1

smtp_connect_timeout 30

router_id LVS_DEVEL

vrrp_skip_check_adv_addr

#1.3+版本需要把此行注释掉才能PING通

#vrrp_strict

vrrp_garp_interval 0

vrrp_gna_interval 0

}

#组建vrrp实例组

vrrp_instance VI_1 {

state BACKUP

interface ens33

Virtual_router_id 51

Virtual_ipaddress {

192.168.29.122

}

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

}

#设定真实服务器地址

Virtual_server 192.168.29.122 80 {

delay_loop 3

lb_algo rr

lb_kind DR

protocol TCP

real_server 192.168.29.142 80 {

weight 1

HTTP_GET {

#url检测

url {

#指定所要检测的页面所在位置

path /index.html

status_code 200

}

}

#tcp检测

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.29.144 80 {

weight 1

HTTP_GET {

url {

path /index.html

status_code 200

}

}

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

#启动keepalived服务

[[email protected] ~]# systemctl start keepalived.service

测试验证

linux lvs keepalived 集群 研究现状,Centos7部署LVS+keepalived高可用集群_第1张图片

linux lvs keepalived 集群 研究现状,Centos7部署LVS+keepalived高可用集群_第2张图片

关闭node2的httpd服务

[[email protected] ~]# systemctl stop httpd.service

linux lvs keepalived 集群 研究现状,Centos7部署LVS+keepalived高可用集群_第3张图片

一直刷新不会报错但是仅能访问node3结点

[[email protected] ~]# ipvsadm -L

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP node1:http rr

-> node3:http Route 1 2 0

重启node2的httpd服务

[[email protected] ~]# systemctl start httpd.service

linux lvs keepalived 集群 研究现状,Centos7部署LVS+keepalived高可用集群_第4张图片

linux lvs keepalived 集群 研究现状,Centos7部署LVS+keepalived高可用集群_第5张图片

[[email protected] ~]# ipvsadm -L

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP node1:http rr

-> node2:http Route 1 0 0

-> node3:http Route 1 2 0

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