1、Keepalived軟件前期用來管理并監(jiān)控LVS集群系統(tǒng)中各個(gè)服務(wù)節(jié)點(diǎn)的狀態(tài)；
2、后期加入了實(shí)現(xiàn)高可用的VRRP功能。因此可以為lvs負(fù)載均衡提供高可用功能，也可以為其他服務(wù)提供高可用。。
實(shí)驗(yàn)鏡像：Centos 8.1.1911
草圖：（待補(bǔ)）
1、兩個(gè)real server 安裝配置
在keepalived Master上測試無問題。
[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、安裝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
}
# 一個(gè)keepalived服務(wù)器,MASTER為主的進(jìn)行服務(wù)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 關(guān)聯(lián)兩個(gè)real server
virtual_server 192.168.94.200 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 50
protocol TCP
# 兩個(gè)real server 都故障，提供服務(wù)的地址
sorry_server 192.168.94.138 80
# 定義real server 1
real_server 192.168.94.140 80 {
weight 1
# real server 存活檢測，檢測url的code
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
# 定義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
}
}
}
把配置文件復(fù)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
}
# 一個(gè)keepalived服務(wù)器,MASTER為主的進(jìn)行服務(wù)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 關(guān)聯(lián)兩個(gè)real server
virtual_server 192.168.94.200 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 50
protocol TCP
# 兩個(gè)real server 都故障，提供服務(wù)的地址
sorry_server 192.168.94.139 80
# 定義real server 1
real_server 192.168.94.140 80 {
weight 1
# real server 存活檢測，檢測url的code
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
# 定義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
兩個(gè)節(jié)點(diǎn)（MASTER、BACKUP）都啟動(dòng)服務(wù)。
查看地址ifconfig –a
VIP只會(huì)啟動(dòng)在MASTER上，當(dāng)MASTER服務(wù)故障后，則BACKUP提供服務(wù)。
2、real server 資源管理
real server 節(jié)點(diǎn)故障后，keepalived會(huì)自動(dòng)在ipvs中進(jìn)行刪除。再上線后也會(huì)重新加進(jìn)來。
我的配置文件可能有點(diǎn)問題，測試的時(shí)候有些奇怪，有時(shí)間在檢查吧。
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