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DR模式搭建LVSkeepalived-多web应用

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注：测试环境因此nginx和Apache都部署在同一台real server上

Master和backup和real server服务器公用。

VIP

172.20.0.210

Master

172.20.0.22

Backup

172.20.0.25

Real_server

172.20.0.22

Real_server

172.20.0.25

Web :nginx

port:8220

Web :Apache

port:8221

创建相应的目录

[root@SALT1 ~]# mkdir software

[root@SALT1 ~]# cd software/

下载安装包：

相应的命令为：

wget
http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz

查看内核参数

[root@SALT1 software]# uname
-a

Linux SALT1 2.6.32-431.el6.x86_64 #1 SMP
Sun Nov 10 22:19:54 EST 2013 x86_64 x86_64 x86_64 GNU/Linux

创建软连接，不创建此链接，ipvsadm编译安装不过去。

[root@SALT1 software]# ln -s
/usr/src/kernels/2.6.32-431.el6.x86_64/ /usr/src/linux

编译安装ipvsadm

[root@SALT1 software]# ls

ipvsadm-1.24.tar.gz

[root@SALT1 software]# tar -xvf
ipvsadm-1.24.tar.gz

ipvsadm-1.24/config_stream.c

ipvsadm-1.24/config_stream.h

…….

[root@SALT1 software]# cd
ipvsadm-1.24

[root@SALT1 ipvsadm-1.24]# make
&& make install

make -C libipvs

make[1]: Entering directory
`/root/software/ipvsadm-1.24/libipvs’

gcc -Wall -Wunused -Wstrict-prototypes -g
-O2 -I/usr/src/linux/include
-DHAVE_NET_IP_VS_H

……..

加载LVS的 IP_VS模块

[root@ccb log]# ipvsadm

IP Virtual Server version 1.2.1
(size=4096)

Prot LocalAddress:Port Scheduler Flags


-> RemoteAddress:Port
Forward Weight ActiveConn InActConn

[root@ccb log]# lsmod |grep ip_vs

ip_vs 115643 0

libcrc32c 1246 1 ip_vs

ipv6 321422 31 ip_vs

下载安装包

相应的命令为：

[root@SALT1 software]# wget
http://www.keepalived.org/software/keepalived-1.1.19.tar.gz

–2016-07-13 14:09:03–
http://www.keepalived.org/software/keepalived-1.1.19.tar.gz

Resolving www.keepalived.org…
37.59.63.157, 2001:41d0:8:7a9d::1

Connecting to
www.keepalived.org|37.59.63.157|:80… connected.

HTTP request sent, awaiting response…
200 OK

Length: 241437 (236K)
[application/x-gzip]

Saving to: “keepalived-1.1.19.tar.gz”

100%[===================================================================================================================>]
241,437 190K/s in 1.2s

2016-07-13 14:09:06 (190 KB/s) –
“keepalived-1.1.19.tar.gz” saved [241437/241437]

编译安装keepalived

[root@SALT1 software]# tar
-xvf keepalived-1.1.19.tar.gz

keepalived-1.1.19/

keepalived-1.1.19/config.log

keepalived-1.1.19/configure

keepalived-1.1.19/README

keepalived-1.1.19/ChangeLog

keepalived-1.1.19/Makefile.in

……..

[root@SALT1 software]# cd
keepalived-1.1.19

[root@SALT1 keepalived-1.1.19]# ./configure –prefix=/usr/local/keepalived

checking for gcc… gcc

……

[root@SALT1 keepalived-1.1.19]#

[root@SALT1 keepalived-1.1.19]# make

make -C lib || exit 1;

make[1]: Entering directory
`/root/software/keepalived-1.1.19/lib’

gcc -g -O2 -I. -Wall -Wunused -Wstrict-prototypes -c memory.c

gcc -g -O2 -I. -Wall -Wunused
-Wstrict-prototypes -c utils.c

开发云主机域名 ……

Make complete

[root@SALT1 keepalived-1.1.19]# make
install

make -C keepalived install

make[1]: Entering directory
`/root/software/keepalived-1.1.19/keepalived’

install -d /usr/local/keepalived/sbin

……

创建相应的目录

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

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

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

[root@ccb keepalived-1.1.19]# mkdir /etc/keepalived/

[root@ccb keepalived-1.1.19]#cd

[root@ccb ~]# cp
/usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

至此lvskeepalived安装完成。

[root@localhost ~]# vi /etc/keepalived/keepalived.conf

#global define

global_defs {

router_id node-A

}

vrrp_sync_group test {

group {


test

}

}

vrrp_instance test {


state MASTER


interface eth2


lvs_sync_daemon_interface eth2


virtual_router_id 50


priority 180


advert_int 3


authentication {


auth_type PASS


auth_pass 1111


}


virtual_ipaddress {


172.20.0.210


}

}

virtual_server 172.20.0.210 8220 {


delay_loop 3


lb_algo rr


lb_kind DR


persistence_timeout 1


protocol TCP


real_server 172.20.0.22 8220 {


weight 1


TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 8220


}


}


real_server 172.20.0.25 8220 {


weight 1


TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 8220


}


}

}

virtual_server 172.20.0.210 8221 {


delay_loop 3


lb_algo rr


lb_kind DR


persistence_timeout 1


protocol TCP


real_server 172.20.0.25 8221 {


weight 1


TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 8221


}


}

real_server 172.20.0.22 8221 {


weight 1


TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 8221


}


}

}

[root@localhost ~]# vi
/etc/keepalived/keepalived.conf

#global define

global_defs {

router_id node-B

}

vrrp_sync_group test {

group {


test

}

}

vrrp_instance test {


state BACKUP


interface eth2


lvs_sync_daemon_interface eth2


virtual_router_id 50


priority 150


advert_int 3


authentication {


auth_type PASS


auth_pass 1111


}


virtual_ipaddress {


172.20.0.210


}

}

virtual_server 172.20.0.210 8220 {


delay_loop 3


lb_algo rr


lb_kind DR


persistence_timeout 1


protocol TCP


real_server 172.20.0.22 8220 {


weight 1


TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 8220


}


}


real_server 172.20.0.25 8220 {


weight 1


TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 8220


}


}

}

virtual_server 172.20.0.210 8221 {


delay_loop 3


lb_algo rr


lb_kind DR


persistence_timeout 1


protocol TCP


real_server 172.20.0.25 8221 {


weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 8221


}


}

real_server 172.20.0.22 8221 {


weight 1


TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 8221


}


}

}

确认启动nginx和apache：

[root@localhost sbin]# lsof
-i:8220

COMMAND
PID USER FD
TYPE DEVICE SIZE/OFF NODE NAME

nginx
22005 root 6u
IPv4 86789 0t0
TCP *:8220 (LISTEN)

nginx
22006 nobody 6u IPv4
86789 0t0 TCP *:8220 (LISTEN)

[root@localhost sbin]# lsof
-i:8221

COMMAND
PID USER FD
TYPE DEVICE SIZE/OFF NODE NAME

httpd
22012 root 4u
IPv6 86820 0t0
TCP *:8221 (LISTEN)

httpd
22015 apache 4u IPv6
86820 0t0 TCP *:8221 (LISTEN)

httpd
22016 apache 4u IPv6
86820 0t0 TCP *:8221 (LISTEN)

httpd
22017 apache 4u IPv6
86820 0t0 TCP *:8221 (LISTEN)

httpd
22018 apache 4u IPv6
86820 0t0 TCP *:8221 (LISTEN)

httpd
22019 apache 4u IPv6
86820 0t0 TCP *:8221 (LISTEN)

httpd
22020 apache 4u IPv6
86820 0t0 TCP *:8221 (LISTEN)

httpd
22021 apache 4u IPv6
86820 0t0 TCP *:8221 (LISTEN)

httpd
22022 apache 4u IPv6
86820 0t0 TCP *:8221 (LISTEN)

在两台real_server上分别创建lvsDR_node脚本：

[root@localhost ~]# vi
/etc/init.d/lvsDR_node

#!/bin/bash

# descript : start real server DR

VIP=172.20.0.210

. /etc/rc.d/init.d/functions

case “$1” in


start)

echo “start LVS of
RealServer DR”

/sbin/ifconfig lo:0 $VIP
broadcast $VIP netmask 255.255.255.255 up

echo “1” >
/proc/sys/net/ipv4/conf/all/arp_ignore

echo “2” >
/proc/sys/net/ipv4/conf/all/arp_announce

;;


stop)

/sbin/ifconfig lo:0 down

echo “close LVS of
RealServer DR”

echo “0” >
/proc/sys/net/ipv4/conf/all/arp_ignore

echo “0” >
/proc/sys/net/ipv4/conf/all/arp_announce

;;


*)

echo “Usage : $0
{start|stop}”

exit 1

esac

分别启动master和backup服务器上面的keepalived:

[root@localhost ~]# /etc/init.d/keepalived
start

Starting keepalived: [ OK ]

[root@localhost ~]#

启动real_server上面的lvsDR_node

[root@localhost ~]# /etc/init.d/lvsDR_node
start

start LVS of RealServer DR

Master：

backup

现在VIP是在master服务器（172.20.0.22）服务器上，为了确保web应用切换之后应用也能正常访问，将master服务器上的nginx和apache停掉。：

可以看到22服务器上nginx和Apache都不能访问了

Nginx:

Apache:

查看状态：

使用VIP访问：

如上图可以看到web应用切换之后web应用依然可以通过VIP正常访问。

切换VIP

Master:

Backup

Nginx验证：

Apache验证：

注：当master上的keepalived再次启动，VIP又会立刻切换到master上，而backup会自动切换为backup state。

如图：

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