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发表于 2014-06-28 11:29 |只看该作者 |倒序浏览

最近测试LVS+Keepalived, 正好才这里找些资料，就把自己的配置过程也分享下。

直接从 http://ox0spy.github.io/debian/2 ... epalived-on-debian/ 负责过来的，CU上格式不太好。

准备机器
LVS_MASTER - 172.16.8.129
LVS_BACKUP - 172.16.8.130
WEB_APP_SERVER_1 - 172.16.8.131
WEB_APP_SERVER_2 - 172.16.8.132
注:

virtual server: 172.16.8.252 (非真实机器, 只需要在web app server上配下这个IP)
所有机器都安装的Debian 7.5 (wheezy)
安装软件
LVS_MASTER上安装配置LVS和keepalived
$ ssh LVS_MASTER
$ sudo apt-get install ipvsadm keepalived
配置LVS
$ cat /etc/default/ipvsadm
# ipvsadm

# if you want to start ipvsadm on boot set this to true
AUTO="false"

# daemon method (none|master|backup)
DAEMON="master"

# use interface (eth0,eth1...)
IFACE="eth0"

# syncid to use
SYNCID="1"
配置keepalived
$ cat /etc/keepalived/keepalived.conf
global_defs {
router_id LVS_MASTER #BACKUP上修改为LVS_BACKUP
}

vrrp_instance VI_1 {
state MASTER       #BACKUP上修改为BACKUP
interface eth0
virtual_router_id 51  #与备机的id必须一致
priority 100       #BACKUP上修改为80
advert_int 1
authentication {
      auth_type PASS
      auth_pass 1111
}
virtual_ipaddress {
      172.16.8.252    #virtual server
}
}

virtual_server 172.16.8.252 80 {
delay_loop 6
lb_algo rr
lb_kind DR
#lb_kind NAT
#persistence_timeout 5
protocol TCP

real_server 172.16.8.131 80 {
      weight 3
      TCP_CHECK {
         connect_timeout 3
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
      }
}

real_server 172.16.8.132 80 {
      weight 3
      TCP_CHECK {
         connect_timeout 3
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
      }
}
}
LVS_BACKUP上安装配置LVS和keepalived
$ ssh LVS_BACKUP
$ sudo apt-get install ipvsadm keepalived
配置LVS
$ cat /etc/default/ipvsadm
# ipvsadm

# if you want to start ipvsadm on boot set this to true
AUTO="false"

# daemon method (none|master|backup)
DAEMON="backup"

# use interface (eth0,eth1...)
IFACE="eth0"

# syncid to use
SYNCID="1"
配置keepalived
$ cat /etc/keepalived/keepalived.conf
global_defs {
router_id LVS_BACKUP #BACKUP上修改为LVS_BACKUP
}

vrrp_instance VI_1 {
state BACKUP       #BACKUP上修改为BACKUP
interface eth0
virtual_router_id 51  #与备机的id必须一致
priority 80          #BACKUP上修改为80
advert_int 1
authentication {
      auth_type PASS
      auth_pass 1111
}
virtual_ipaddress {
      172.16.8.252    #virtual server
}
}

virtual_server 172.16.8.252 80 {
delay_loop 6
lb_algo rr
lb_kind DR
#lb_kind NAT
#persistence_timeout 5
protocol TCP

real_server 172.16.8.131 80 {
      weight 3
      TCP_CHECK {
         connect_timeout 3
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
      }
}

real_server 172.16.8.132 80 {
      weight 3
      TCP_CHECK {
         connect_timeout 3
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
      }
}
}
配置WEB_APP_SERVER_1
安装nginx
$ ssh WEB_APP_SERVER_1
$ sudo apt-get install nginx
$ sudo bash -c 'echo "Web App Server 1" > /usr/share/nginx/www/index.html'
配置IP
$ sudo ifconfig eth0:0 172.16.8.252 netmask 255.255.255.255 up
修改配置文件（上面的配置重启后需要重新输入命令）

$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
auto eth0
auto eth0:0

iface lo inet loopback

# The primary network interface
allow-hotplug eth0
#iface eth0 inet dhcp
iface eth0 inet static
      address 172.16.8.131
      netmask 255.255.255.0
      gateway 172.16.8.2

iface eth0:0 inet static
      address 172.16.8.252
      netmask 255.255.255.255
      gateway 172.16.8.2
配置WEB_APP_SERVER_2
安装nginx
$ ssh WEB_APP_SERVER_2
$ sudo apt-get install nginx
$ sudo bash -c 'echo "Web App Server 2" > /usr/share/nginx/www/index.html'
配置IP
$ sudo ifconfig eth0:0 172.16.8.252 netmask 255.255.255.255 up
修改配置文件（上面的配置重启后需要重新输入命令）

$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
auto eth0
auto eth0:0

iface lo inet loopback

# The primary network interface
allow-hotplug eth0
#iface eth0 inet dhcp
iface eth0 inet static
      address 172.16.8.132
      netmask 255.255.255.0
      gateway 172.16.8.2

iface eth0:0 inet static
      address 172.16.8.252
      netmask 255.255.255.255
      gateway 172.16.8.2
启动LVS, keepalived
$ ssh LVS_MASTER
$ sudo service ipvsadm restart
$ sudo service keepalived restart
$ ssh LVS_BACKUP
$ sudo service ipvsadm restart
$ sudo service keepalived restart
测试
查看服务器状态
$ while true; do curl 172.16.8.252; curl 172.16.8.252; sleep 1; done
Web App Server 1
Web App Server 2
Web App Server 1
Web App Server 2
...
$ ssh LVS_MASTER
$ sudo ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress

ort Scheduler Flags
-> RemoteAddress

ort          Forward Weight ActiveConn InActConn
TCP  172.16.8.252:80 rr
  -> 172.16.8.131:80             Route 3    0       29
  -> 172.16.8.132:80             Route 3    0       30
将WEB_APP_SERVER_1的nginx进程结束，查看效果
$ ssh WEB_APP_SERVER_1
$ sudo service nginx stop
$ while true; do curl 172.16.8.252; curl 172.16.8.252; sleep 1; done
curl: (7) couldn't connect to host
Web App Server 2
curl: (7) couldn't connect to host
Web App Server 2
curl: (7) couldn't connect to host
Web App Server 2
Web App Server 2
Web App Server 2
Web App Server 2
...
$ sudo ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress

ort Scheduler Flags
-> RemoteAddress

ort          Forward Weight ActiveConn InActConn
TCP  172.16.8.252:80 rr
  -> 172.16.8.132:80             Route 3    0       114
$ ssh WEB_APP_SERVER_1
$ sudo service nginx stop
$ while true; do curl 172.16.8.252; curl 172.16.8.252; sleep 1; done
Web App Server 1
Web App Server 2
Web App Server 1
Web App Server 2
...
将LVS_MASTER关闭，查看请求web app server的结果
$ ssh LVS_MASTER
$ sudo shutdown -h now
$ while true; do curl 172.16.8.252; curl 172.16.8.252; sleep 1; done
Web App Server 1
Web App Server 2
Web App Server 1
Web App Server 2
...