keepalived双主模式实现双机热备

最新推荐文章于 2025-07-07 16:26:26 发布

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最新推荐文章于 2025-07-07 16:26:26 发布 · 1.7k 阅读

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#keepalived #keepalived双主模式 #keepalived双机热备

本文详细介绍了如何使用keepalived实现双主模式的双机热备。通过配置两个节点，每个节点分别作为另一个节点的主和备，利用VRRP_script来监测节点状态，并通过VIP流转确保高可用性。在测试中，创建和删除down文件可以观察VIP在两台机器间的切换，验证了配置的有效性。

keepalived实现双主模式

以下称test节点：CentOS release6.3 (Final) 192.168.88.130 test.field.com

以下称www节点：CentOS release6.3 (Final) 192.168.88.131 www.field.com

配置实例：

1、test节点配置：

VI_1：作为主节点

VI_2：作为从节点

[root@testkeepalived]# vi keepalived.conf

! ConfigurationFile for keepalived

global_defs {

notification_email {

root@localhost

}

notification_email_from kaadimin@localhost

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id test.field.com

vrrp_mcast_group4 224.18.0.200

}

vrrp_scriptchk_maintanance {

script "[[ -f /etc/keepalived/down]] && exit 1 || exit 0"

interval 1

#interval多长时间检查一次

#如果失败返回1权重-2

weight -2

}

vrrp_instanceVI_1 {

state MASTER

interface eth0

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 4e78bb3a

}

virtual_ipaddress {

192.168.88.80/16 dev eth0 label eth0:0

}

track_script {

#track_script 调用脚本

chk_maintanance

}

vrrp_instanceVI_2 {

state BACKUP

interface eth0

virtual_router_id 61

"keepalived.conf"185L, 4211C written

[root@testkeepalived]#

[root@testkeepalived]# vi keepalived.conf

! ConfigurationFile for keepalived

global_defs {

notification_email {

root@localhost

}

notification_email_from kaadimin@localhost

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id test.field.com

vrrp_mcast_group4 224.18.0.200

}

vrrp_scriptchk_maintanance {

script "[[ -f /etc/keepalived/down]] && exit 1 || exit 0"

interval 1

#interval多长时间检查一次

#如果失败返回1权重-2

weight -2

}

vrrp_instanceVI_1 {

state MASTER

interface eth0

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 4e78bb3a

}

virtual_ipaddress {

192.168.88.80/16 dev eth0 label eth0:0

}

track_script {

#track_script 调用脚本

chk_maintanance

}

vrrp_instanceVI_2 {

state BACKUP

interface eth0

virtual_router_id 61

priority 99

advert_int 1

authentication {

auth_type PASS

auth_pass 8eR8bb5L

}

virtual_ipaddress {

192.168.88.90/16 dev eth0 label eth0:1

}

track_script {

#track_script 调用脚本

chk_maintanance

}

2、www节点配置：

VI_2：作为主节点

VI_1：作为从节点

[root@wwwkeepalived]# vi keepalived.conf

! ConfigurationFile for keepalived

global_defs {

notification_email {

root@localhost

}

notification_email_from kaadimin@localhost

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id www.field.com

vrrp_mcast_group4 224.18.0.200

}

vrrp_scriptchk_maintanance {

script "[[ -f /etc/keepalived/down]] && exit 1 || exit 0 "

interval 1

#interval多长时间检查一次

#如果失败返回1权重-20

weight -2

}

vrrp_instanceVI_1 {

state BACKUP

interface eth1

virtual_router_id 51

priority 99

advert_int 1

authentication {

auth_type PASS

auth_pass 4e78bb3a

}

virtual_ipaddress {

192.168.88.80/16 dev eth1 label eth1:0

}

track_script {

#track_script 调用脚本

chk_maintanance

}

vrrp_instanceVI_2 {

state MASTER

interface eth1

virtual_router_id 61

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 8eR8bb5L

}

virtual_ipaddress {

192.168.88.90/16 dev eth1 label eth1:1

}

track_script {

#track_script 调用脚本

chk_maintanance

}

keepalived双主模式实现

案例1、keepalived配置单个vip实例

注释VIP实例VI_1，启用VIP实例VI_2

[root@wwwkeepalived]# vi keepalived.conf

使用以下命令注释VI_1

:.,33s/^/#/g

#vrrp_instanceVI_1 {

# state BACKUP

# interface eth1

# virtual_router_id 51

# priority 99

# advert_int 1

# authentication {

# auth_type PASS

# auth_pass 4e78bb3a

# }

# virtual_ipaddress {

# 192.168.88.80/16 dev eth1 label eth1:0

# }

[root@test keepalived]#!1057

servicekeepalived restart;ssh www 'service keepalived restart'

停止 keepalived：[确定]

正在启动 keepalived：[确定]

停止 keepalived：[确定]

正在启动 keepalived：[确定]

[root@testkeepalived]# ip addr list

1: lo:<LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN

link/loopback 00:00:00:00:00:00 brd00:00:00:00:00:00

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