keepalived实现LVS负载均衡高可用集群(一)

编程

1、Keepalived软件前期用来管理并监控LVS集群系统中各个服务节点的状态;

2、后期加入了实现高可用的VRRP功能。因此可以为lvs负载均衡提供高可用功能,也可以为其他服务提供高可用。。

实验镜像:Centos 8.1.1911

草图:(待补)

1、两个real server 安装配置

在keepalived Master上测试无问题。

[root@HA1 ~]# curl http://192.168.94.140

this is real 1 server

[root@HA1 ~]# curl http://192.168.94.141

this is real 2 server

[root@HA1 ~]#

2、安装keepalived、ipvsadm

yum install ipvsadm keepalived -y

使用keepalived即可完成real server的添加。

配置文件在/etc/keepalived下

[root@HA1 keepalived]# pwd

/etc/keepalived

[root@HA1 keepalived]# ls

keepalived.conf

[root@HA1 keepalived]# cp keepalived.conf keepalived.conf.bak

[root@HA1 keepalived]# echo "" > keepalived.conf

[root@HA1 keepalived]#

3、keepalived文件配置

MASTER

! Configuration File for keepalived

# 全局

global_defs {

notification_email {

root@localhost

}

notification_email_from keepalived@server.com

smtp_connect_timeout 3

smtp_server 127.0.0.1

router_id LVS_DEVEL

}

# 一个keepalived服务器,MASTER为主的进行服务提供

vrrp_instance VI_1 {

interface ens33

state MASTER

priority 101

virtual_router_id 51

garp_master_delay 1

authentication {

auth_type PASS

auth_pass password

}

# VIP 地址

virtual_ipaddress {

192.168.94.200 dev ens33 label ens33:0

}

}

# VIP 关联两个real server

virtual_server 192.168.94.200 80 {

delay_loop 6

lb_algo rr

lb_kind DR

persistence_timeout 50

protocol TCP

# 两个real server 都故障,提供服务的地址

sorry_server 192.168.94.138 80

# 定义real server 1

real_server 192.168.94.140 80 {

weight 1

# real server 存活检测,检测url的code

HTTP_GET {

url {

path /

status_code 200

}

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

# 定义real server 2

real_server 192.168.94.141 80 {

weight 1

HTTP_GET {

url {

path /

status_code 200

}

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

把配置文件复制到HA2上

BACKUP

! Configuration File for keepalived

# 全局

global_defs {

notification_email {

root@localhost

}

notification_email_from keepalived@server.com

smtp_connect_timeout 3

smtp_server 127.0.0.1

router_id LVS_DEVEL

}

# 一个keepalived服务器,MASTER为主的进行服务提供

vrrp_instance VI_1 {

interface ens33

state BACKUP

priority 100

virtual_router_id 51

garp_master_delay 1

authentication {

auth_type PASS

auth_pass password

}

# VIP 地址

virtual_ipaddress {

192.168.94.200 dev ens33 label ens33:0

}

}

# VIP 关联两个real server

virtual_server 192.168.94.200 80 {

delay_loop 6

lb_algo rr

lb_kind DR

persistence_timeout 50

protocol TCP

# 两个real server 都故障,提供服务的地址

sorry_server 192.168.94.139 80

# 定义real server 1

real_server 192.168.94.140 80 {

weight 1

# real server 存活检测,检测url的code

HTTP_GET {

url {

path /

status_code 200

}

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

# 定义real server 2

real_server 192.168.94.141 80 {

weight 1

HTTP_GET {

url {

path /

status_code 200

}

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

1、高可用

两个节点(MASTER、BACKUP)都启动服务。

查看地址ifconfig –a

VIP只会启动在MASTER上,当MASTER服务故障后,则BACKUP提供服务。

2、real server 资源管理

real server 节点故障后,keepalived会自动在ipvs中进行删除。再上线后也会重新加进来。

我的配置文件可能有点问题,测试的时候有些奇怪,有时间在检查吧。


读书和健身总有一个在路上

原文链接:https://www.cnblogs.com/Renqy/archive/2020/06/04/13044797.html

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