学无止境·运维高阶⑤（LVS-DR 群集 配置Nginx负载均衡）

一、LVS-DR 群集

1、相关配置环境

主机	用途	ip
node1	VIP	192.168.85.160
node2	RS1	192.168.85.161
node3	RS2	192.168.85.162

2、在RS上配置并启动脚本

2.1相关脚本

[root@node3 ~]# vim /etc/init.d/lvs_rs
#!/bin/sh
#
# Startup script handle the initialisation of LVS
# chkconfig: - 28 72
# description: Initialise the Linux Virtual Server for DR
#
### BEGIN INIT INFO
# Provides: ipvsadm
# Required-Start: $local_fs $network $named
# Required-Stop: $local_fs $remote_fs $network
# Short-Description: Initialise the Linux Virtual Server
# Description: The Linux Virtual Server is a highly scalable and highly
#   available server built on a cluster of real servers, with the load
#   balancer running on Linux.
# description: start LVS of DR-RIP
LOCK=/var/lock/ipvsadm.lock
VIP=192.168.85.160
. /etc/rc.d/init.d/functions
start() {PID=`ifconfig | grep lo:10 | wc -l`if [ $PID -ne 0 ];thenecho "The LVS-DR-RIP Server is already running !"else/sbin/ifconfig lo:10 $VIP netmask 255.255.255.255 broadcast $VIP up/sbin/route add -host $VIP dev lo:10echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/lo/arp_announceecho "1" >/proc/sys/net/ipv4/conf/ens33/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/ens33/arp_announceecho "1" >/proc/sys/net/ipv4/conf/all/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/all/arp_announce/bin/touch $LOCKecho "starting LVS-DR-RIP server is ok !"fi
}stop() {/sbin/route del -host $VIP dev lo:10/sbin/ifconfig lo:10 down  >/dev/nullecho "0" >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho "0" >/proc/sys/net/ipv4/conf/lo/arp_announceecho "0" >/proc/sys/net/ipv4/conf/ens33/arp_ignoreecho "0" >/proc/sys/net/ipv4/conf/ens33/arp_announceecho "0" >/proc/sys/net/ipv4/conf/all/arp_ignoreecho "0" >/proc/sys/net/ipv4/conf/all/arp_announcerm -rf $LOCKecho "stopping LVS-DR-RIP server is ok !"
}status() {if [ -e $LOCK ];thenecho "The LVS-DR-RIP Server is already running !"elseecho "The LVS-DR-RIP Server is not running !"fi
}case "$1" instart)start;;stop)stop;;restart)stopstart;;status)status;;*)echo "Usage: $1 {start|stop|restart|status}"exit 1
esac
exit 0

2.2 启动脚本，另一台RS同样步骤

chmod +x /etc/init.d/lvs_rs 
chkconfig --add lvs_rs
service lvs_rs start 

3、LVS-DR模式配置脚本

vim /etc/init.d/lvs_dr 
# Provides: ipvsadm
# Required-Start: $local_fs $network $named
# Required-Stop: $local_fs $remote_fs $network
# Short-Description: Initialise the Linux Virtual Server
# Description: The Linux Virtual Server is a highly scalable and highly
#   available server built on a cluster of real servers, with the load
#   balancer running on Linux.
# description: start LVS of DR
LOCK=/var/lock/ipvsadm.lock
VIP=192.168.85.160
RIP1=192.168.85.161
RIP2=192.168.95.162
DipName=ens33. /etc/rc.d/init.d/functions
start() {PID=`ipvsadm -Ln | grep ${VIP} | wc -l`if   [ $PID -gt 0 ];thenecho "The LVS-DR Server is already running !"else#Set the Virtual IP Address/sbin/ifconfig ${DipName}:10 $VIP broadcast $VIP netmask 255.255.255.255 up/sbin/route add -host $VIP dev ${DipName}:10#Clear IPVS Table/sbin/ipvsadm -C#Set Lvs/sbin/ipvsadm -At $VIP:80 -s wrr/sbin/ipvsadm -at $VIP:80 -r $RIP1:80 -g -w 2/sbin/ipvsadm -at $VIP:80 -r $RIP2:80 -g -w 1/bin/touch $LOCK#Run Lvsecho "starting LVS-DR Server is ok !"       fi
}stop()    {#clear Lvs and vip /sbin/ipvsadm -C/sbin/route del -host $VIP dev ${DipName}:10/sbin/ifconfig ${DipName}:10 down >/dev/nullrm -rf $LOCKecho "stopping LVS-DR server is ok !"
}status() {if [ -e $LOCK ];thenecho "The LVS-DR Server is already running !"elseecho "The LVS-DR Server is not running !"fi
}case "$1" instart)start;;stop)stop;;restart)stopstart;;status)status;;*)echo "Usage: $1 {start|stop|restart|status}"exit 1
esac
exit 0

4、测试

for ((i=1;i<=6;i++)); do curl 192.168.85.160; done

二、Nginx负载均衡

1、安装Nginx并关闭相应设置

仓库配置

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
enabled=1

关闭设置

systemctl  stop   firewalld setenforce   0

2、向主机 node2，node3 写入内容

systenctl start nginx    启动nginx服务echo "web test page ip is `hostname -I`" > /usr/share/nginx/html/index.html   #写入内容systenctl start nginx    再次启动nginx服务

3、在node1上配置

 vim /etc/nginx/nginx.conf #在 http模块中写入如下内容server {listen  80;server_name test.ng.test;    定义域名  也可以用iplocation / {proxy_pass http://web_server;}}upstream web_server {server 192.168.85.161:80;     nginx服务器地址  server 192.168.85.162:80;}

4、测试

curl 192.168.85.160