一、Keepalived介紹
Keepalived軟件主要是通過VRRP協議實現高可用功能的。目的就是爲了解決靜態路由單點故障問題的，它能夠保證當個別節點宕機時，整個網絡可以不間斷地運行。Keepalived具有三個重要功能：
1.有配置管理LVS的功能；
2.對LVS下面節點進行健康檢查功能；
3.實現系統網絡服務的高可用功能。
二、Keepalived高可用服務搭建
1.安裝Keepalived環境說明
| HostName | IP | 說明 |
| lb01 | 192.168.12.128 | Keepalived主服務器(Nginx主負載均衡器）VIP:192.168.12.126 |
| lb02 | 192.168.12.129 | Keepalived備服務器(Nginx備負載均衡器）VIP:192.168.12.127 |
| web01 | 192.168.12.130 | web01服務器 |
| web02 | 192.168.12.131 | web02服務器 |
| web03 | 192.168.12.132 | web03服務器 |
2.開始安裝Keepalived軟件
[root@Nginx src]# wget http://www.keepalived.org/software/keepalived-1.2.24.tar.gz
[root@Nginx src]# tar -zxvf keepalived-1.2.24.tar.gz
[root@Nginx src]# cd keepalived-1.2.24
[root@Nginx keepalived-1.2.24]# ./configure \
> --prefix=/usr/local/keepalived
[root@Nginx keepalived-1.2.24]# make && make install
[root@Nginx]# cd /usr/local/keepalived/etc/rc.d/init.d
[root@Nginx init.d]# cp keepalived /etc/init.d/keepalived
[root@Nginx init.d]# cp keepalived /etc/init.d/keepalived
[root@Nginx init.d]# chmod +x /etc/init.d/keepalived
[root@Nginx init.d]# chkconfig keepalived on
[root@Nginx /]# ln /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/keepalived
[root@Nginx sbin]# ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalived
[root@Nginx /]# mkdir /etc/keepalived
[root@Nginx /]# vim /etc/keepalived/keepalived.conf
#配置lb01 192.168.12.128的keepalived.conf
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 55
mcast_src_ip 192.168.12.128
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.12.126/24 dev eth0 label eth0:1
}
}
vrrp_instance VI_2 {
state BACKUP
interface eth0
virtual_router_id 56
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtural_ipaddress {
192.168.12.127/24 dev eth0 label eth0:2
}
#配置lb02 192.168.12.129的keepalived.conf
[root@Nginx keepalived]# vim keepalived.conf
router_id lb02
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 55
mcast_src_ip 192.168.12.129
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.12.126/24 dev eth0 label eth0:1
}
}
vrrp_instance VI_2 {
state MASTER
interface eth0
virtual_router_id 56
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.12.127/24 dev eth0 label eth0:2
}
}
[root@Nginx /]# iptables -I INPUT -s192.168.12.128 -p112 -j ACCEPT
[root@Nginx /]# service iptables save
[root@Nginx keepalived]# iptables -I INPUT -s192.168.12.129 -p112 -jACCEPT
[root@Nginx keepalived]# service iptables save
#Nginx負載均衡配合Keepalived服務案例實戰
#Nginx負載均衡的配置如下：
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream www_server_pools {
server 192.168.12.130:80 weight=1;
server 192.168.12.131:80 weight=1;
server 192.168.12.132:80 weight=1;
}
server {
listen 192.168.12.126:80;
server_name www.etiantian.org;
location / {
proxy_pass http://www_server_pools;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
#Nginx web1 web2 web3的配置請點擊鏈接地址：
http://blog.51cto.com/sky9896/2346547 #nginx web配置
#測試結果如下：
