keepavlied起初專門為LVS設計的，專門用來監控LVS集群系統中各個服務節點的狀態，后來加入VRRP功能，因此除了配合LVS服務外，也可以作為其他服務(nginx，haproxy)的高可用軟件。

keepalived服務兩大用途：healthcheck 健康檢查(針對RS) 、failover 高可用故障轉移(主備)

keepalived的安裝，主和備都需要安裝

和LVS安裝一樣，最好也先給內核路徑做一個軟連接到/usr/src/linux[root@localhost?~]#?ln?-s?/usr/src/kernels/2.6.32-573.8.1.el6.i686/?/usr/src/linux

[root@localhost?~]#?cd?/usr/local/src/

[root@localhost?src]#?wget?[root@localhost?src]#?tar?xf?keepalived-1.1.19.tar.gz

[root@localhost?src]#?cd?keepalived-1.1.19

[root@localhost?keepalived-1.1.19]#?./configure

configure執行成功的結果：有3個Yes；支持IPVS框架，IPVS的同步支持，VRRP的框架支持；

Keepalived configuration

------------------------

Keepalived version : 1.1.19

Compiler : gcc

Compiler flags : -g -O2

Extra Lib : -lpopt -lssl -lcrypto

Use IPVS Framework : Yes

IPVS sync daemon support : Yes

Use VRRP Framework : Yes

Use Debug flags : No[root@localhost?keepalived-1.1.19]#?make

[root@localhost?keepalived-1.1.19]#?make?install

配置keepalived[root@localhost?keepalived-1.1.19]#?cp?/usr/local/etc/rc.d/init.d/keepalived?/etc/init.d/

[root@localhost?keepalived-1.1.19]#?cp?/usr/local/etc/sysconfig/keepalived?/etc/sysconfig/

[root@localhost?keepalived-1.1.19]#?mkdir?/etc/keepalived?-p

[root@localhost?keepalived-1.1.19]#?cp?/usr/local/etc/keepalived/keepalived.conf?/etc/keepalived/

[root@localhost?keepalived-1.1.19]#?cp?/usr/local/sbin/keepalived?/usr/sbin/

[root@localhost?keepalived-1.1.19]#?/etc/init.d/keepalived?start

主MASTER、備backup上配置文件：/etc/keepalived/keepalived.conf

主master配置：vrrp_instance?VI_1?{

state?MASTER

interface?eth0

virtual_router_id?51

priority?150

advert_int?1

authentication?{

auth_type?PASS

auth_pass?1111

}

virtual_ipaddress?{

192.168.20.100/24

}

}

備 backup 的配置:vrrp_instance?VI_1?{

state?BACKUP

interface?eth0

virtual_router_id?51

priority?100

advert_int?1

authentication?{

auth_type?PASS

auth_pass?1111

}

virtual_ipaddress?{

192.168.20.100/24

}

}

主、備啟動keepalived，主綁定VIP地址，主停止keepalived服務，備機馬上接管VIP；

總結

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