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Nginx+Keepalived实现负载均衡
OS:Centos 5.7
kernel:2.6.18-274.el5
主：10.10.8.69
备：10.10.8.70
VIP:10.10.8.71
client1:10.10.8.72
client2:10.10.8.73
一，安装gcc等环境
二，下载软件，nginx pcre
nginx:nginx-1.1.11.tar.gz
pcre:pcre-8.21.tar.gz
keepalived-1.1.19.tar.gz
三，安装pcre
解压
tar zxvf pcre-8.21.tar.gz
cd pcre-8.21
编译前的配置：
./configure
配置：
make
安装：
make install
四：安装nginx：
解压：
tar zxv nginx-1.1.11.tar.gz
cd nginx-1.1.11
编译前的配置
./configure --user=www --group=www --prefix=/usr/local/nginx \
--with-http_stub_status_module \
--with-http_ssl_module
make&&make install
配置Nginx：
vi /usr/local/nginx/conf/nginx.conf
user www;
worker_processes 8;
error_log logs/error.log;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream; sendfile on;
keepalive_timeout 65;
#gzip on;
upstream birdman1.7road.com {
server 10.10.8.72:80;
server 10.10.8.73:80;
}
server {
listen 80;
server_name birdman1.7road.com;
charset utf-8;
location / {
root html;
index index.html index.htm;
proxy_pass http://birdman1.sosoav.com;
proxy_set_header X-Real-IP $remote_addr;
client_max_body_size 100m;
}
location ~ ^/(WEB-INF)/ {
deny all;
} error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
} }
}
注：10.10.8.72和10.10.8.73为apache后端服务器。
五：开启转发功能：
sed -i ‘s#net.ipv4.ip_forward = 0#net.ipv4.ip_forward = 1#‘ /etc/sysctl.conf
sysctl -p
六，安装keepalived
tar zxvf keepalived-1.1.19.tar.gz
cd keepalived-1.1.19
./configure --prefix=/usr/local/keepalived
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
（1）主服务器配置：
vi /etc/keepalived/keepalived.conf
#################################[MASTER]##############################################
! Configuration File for keepalived
global_defs {
notification_email {
64125568@qq.com
}
notification_email_from birdsdeng@163.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
#define nginx-master-IP
mcast_src_ip 10.10.8.69 #本机IP
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass jesse
}
#define vip
virtual_ipaddress {
10.10.8.71 #为VIP IP10.10.8.71
}
}
####################################################################################
注：设置master的priority为100
（2）备服务器上配置：
###################################[BACKUP]###########################################
! Configuration File for keepalived
global_defs {
notification_email {
64125568@qq.com
}
notification_email_from birdsdeng@163.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
#define nginx-backup-ip
mcast_src_ip 10.10.8.70 #本机IP
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass jesse
}
virtual_ipaddress {
10.10.8.71 #为VIP ip
}
}
###################################[BACKUP]###########################################
注：设置backup的priority为99
七，启动keepalived
启动keepalived和加入开机自动启动
/etc/init.d/keepalived start
echo "/etc/init.d/keepalived start" >>/etc/rc.local
命令检查vrrp是否启动
[root@birdman1 soft]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:04:d9:b0 brd ff:ff:ff:ff:ff:ff
inet 10.10.8.69/24 brd 10.10.8.255 scope global eth0
inet 10.10.8.71/32 scope global eth0
九：监控nginx：此在
vi /shell/nginx_pid.sh
###################################################
#!/bin/bash
while :
do
nginxpid=`ps -C nginx --no-header | wc -l`
if [ $nginxpid -eq 0 ]
then
/usr/local/nginx/sbin/nginx
sleep 5
if [ $nginxpid -eq 0 ]
then
/etc/init.d/keepalived stop
fi
fi
sleep 5
done
###################################################
nohup /bin/bash /shell/nginx_pid.sh &
如果你正在运行一个进程，而且你觉得在退出帐户时该进程还不会结束，
那么可以使用nohup命令。该命令可以在你退出root帐户之后继续运行相应的进程.
10.10.8.72和10.10.8.73为后端apache，省略配置
测试：访问http://birdman1.sosoav.com
由于配置client1和client2的内容不同（便于区分），打开http://birdman1.7road.com后显示内容为
10.10.8.72或10.10.8.73
假设10.10.8.69（主）的nginx挂掉：
1，停掉主上得nginx：
[root@birdman1 ~]# killall nginx
在backup上查看：
[root@eklfj-2edbdf6c2 ~]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:22:31:e3 brd ff:ff:ff:ff:ff:ff
inet 10.10.8.70/24 brd 10.10.8.255 scope global eth0
[root@eklfj-2edbdf6c2 ~]# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:22:31:e3 brd ff:ff:ff:ff:ff:ff
inet 10.10.8.70/24 brd 10.10.8.255 scope global eth0
inet 10.10.8.71/32 scope global eth0
以上可见，backup服务器上多了IP10.10.8.71
然后再次访问http://birdman1.sosoav.com 仍能访问。哈哈，成功了
本文出自 “我是一只小小鸟” 博客，请务必保留此出处http://2242558.blog.51cto.com/2232558/1545338
Nginx+Keepalived实现负载均衡