Linux LVS+KEEPALIVED+HTTPD Configuration

1. Nat Mode
   

   #!/bin/bash

   #开启director服务器上的路由转发功能:

   Echo 1 >/proc/sys/net/ipv4/ip_forward

   # Turn off ICMP redirection

   echo 0 >/proc/sys/net/ipv4/conf/all/send_redirects

   echo 0 >/proc/sys/net/ipv4/conf/default/send_redirects

   echo 0 >/proc/sys/net/ipv4/conf/eth0/send_redirects

   echo 0 >/proc/sys/net/ipv4/conf/eth1/send_redirects

   #director设置nat防火墙

   Iptables-t nat-f

   Iptables-t Nat-x

   Iptables-t nat-a postrouting-s 192.168.21.0/24-j Masquerade

   #director设置ipvsadm

   Ipvsadm= '/sbin/ipvsadm '

   $IPVSADM-C

   $IPVSADM-A-T 192.168.31.166:80-s lc-p 300

   $IPVSADM-T 192.168.31.166:80-r 192.168.21.100:80-m-W 1

2. Dr Configuration

   Director on vim/usr/local/sbin/lvs_dr.sh
   

3. #!/bin/bash

Echo 1 >/proc/sys/net/ipv4/ip_forward

Ipv=/sbin/ipvsadm

vip=192.168.31.110

rs1=192.168.31.100

Rs2=192.168.31.101

Ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 up

Route add-host $vip Dev eth0:0

$IPV-C

$IPV-A-T $VIP: 80-s RR

$IPV-A-t $vip: 80-r $rs 1:80-g-W 1

$IPV-A-t $vip: 80-r $rs 2:80-g-W 1

Two RS on: vim/usr/local/sbin/lvs_dr_rs.sh

#!/bin/bash

vip=192.168.31.110

Ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up

Route Add-host $vip lo:0

echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

Environment description

Operating system CentOS 6.4 x86_64

dr1-master:172.17.0.211

dr2-backup:172.17.0.212

vip:172.17.0.210

realserver1:172.17.0.213

realserver1:172.17.0.214

1. Installing the CentOS extension source Eple-release

[Email protected] yum.repos.d]# yum-y install epel-releaseyum-y install Epel-release

2. Installing the Ipvs management tool

[Email protected] yum.repos.d]# yum-y install Ipvsadm

3. Install the keepalived on the DR1 and DR2 hosts separately

[Email protected] yum.repos.d]# yum-y install keepalived

4. Configure keepalived

[Email protected] ~]# vim/etc/keepalived/keepalived.conf

! Configuration File for Keepalived

Global_defs {
Notification_email {
[Email protected]
}
Notification_email_from [email protected]
Smtp_server 60.207.246.98

Smtp_connect_timeout 30
router_id Lvs_1
}

Vrrp_instance Vi_1 {
State MASTER
Interface eth0
VIRTUAL_ROUTER_ID 51
Priority 100
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass 1111
}
virtual_ipaddress {
172.17.0.210
}
}

Virtual_server 172.17.0.210 80 {
Delay_loop 6
Lb_algo WRR
Lb_kind DR
Nat_mask 255.255.255.0
Persistence_timeout 50
Protocol TCP
Real_server 172.17.0.213 80 {

Weight1

tcp_check{

Connect_timeout8

Nb_get_retry3

Delay_before_retry3

Connect_port80

}

}

Real_server 172.17.0.214 80 {

Weight1

tcp_check{

Connect_timeout8

Nb_get_retry3

Delay_before_retry3

Connect_port80

}

}

}

5. Configuring the Web server, Realserver1, and REALSERVER2 nodes

Since the use of Dr mode scheduling, Real_server will be the VIP of LVS to directly reply to the client, so need to open the Real_server on the lo on the LVS VIP to establish communication with the client

1) yum–y Install httpd

[Email protected] ~]# yum-y install httpd

2) script realserver.sh on RealServer1 and RealServer2:

vim/etc/init.d/realserver.sh

#add for Chkconfig
#chkconfig: 2345 #234都是文本界面, 5 is the graphical interface x,70 boot sequence number, 30 system shutdown, script
#止顺序号
#description: Realserver ' s script #关于脚本的简短描述
#processname: realserver.sh #第一个进程名, will be used in the rear setting automatically
#!/bin/bash
vip=172.17.0.210
Source/etc/rc.d/init.d/functions
Case "$" in
Start
Ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
/sbin/route add-host $VIP Dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "Realserver Start OK"
;;
Stop
Ifconfig lo:0 Down
Route del $VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "Realserver stoped"
;;
*)
echo "Usage: $ {start|stop}"
Exit 1
Esac
Exit 0
3)//Add permissions for realserver.sh

[Email protected] ~]# chmod 755/etc/init.d/realserver.sh

[Email protected] ~]# chmod 755/etc/init.d/realserver.sh

4) Start keepalived and realserver.sh scripts

[[email protected] ~]#/etc/init.d/realserver.sh start

[[email protected] ~]#/etc/init.d/realserver.sh start

[[email protected] ~]#/etc/init.d/keepalived start

[[email protected] ~]#/etc/init.d/keepalived start

5) Testing

[Email protected] ~]# ipvsadm-l-N
IP Virtual Server version 1.2.1 (size=4096)
Prot Localaddress:port Scheduler Flags
Remoteaddress:port Forward Weight activeconn inactconn
TCP 172.17.0.210:80 WRR Persistent 50
-172.17.0.213:80 Route 1 0 0
-172.17.0.214:80 Route 3 0 0
[Email protected] ~]#
[Email protected] keepalived]# ipvsadm-l-N
IP Virtual Server version 1.2.1 (size=4096)
Prot Localaddress:port Scheduler Flags
Remoteaddress:port Forward Weight activeconn inactconn
TCP 172.17.0.210:80 WRR Persistent 50
-172.17.0.213:80 Route 1 0 0
-172.17.0.214:80 Route 3 0 0
[Email protected] keepalived]#

Linux LVS+KEEPALIVED+HTTPD Configuration