Nginx + keepalived 主备负载均衡搭建实战
2. 安装配置过程软件下载
wget http://nginx.org/download/nginx-1.2.3.tar.gz
wget http://nchc.dl.sourceforge.net/project/pcre/pcre/8.12/pcre-8.12.tar.gz
wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
1) Nginx安装配置（两台机器一样安装）
# pcrc-8.12
tar zxvf pcre-8.12.tar.gz
cd pcre-8.12
./configure
make && make install
# nginx-1.2.3
groupadd www
useradd –g www www
tar zxvf nginx-1.2.3.tar.gz
cd nginx-1.2.3
./configure --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module
make && make install
2) Keepalived安装配置（两台机器都要安装）
tar zxvf keepalived-1.2.7.tar.gz
cd keepalived-1.2.7
./configure –prefix=/usr/local/keepalived
make && make install
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
chkconfig --add keepalived
chkconfig keepalived on
3) Keepalived 配置
（主keepalived即nginx-1上的配置）
! Configuration File for keepalived
global_defs {
notification_email {
root@189.cn
}
notification_email_from root@189.cn
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script Monitor_Nginx {
script "/usr/local/scripts/nginx_pid.sh"
interval 2
weight 2
}
//定义一个检测nginx程序的脚本
vrrp_instance VI_1 {
state MASTER
interface eth1 // 实例绑定到一块稳定的网卡上
virtual_router_id 51
priority 180 // 评定优先级，数值大的为master
advert_int 1 // 心跳检测时间，单位秒
authentication { // 主备nginx之间的通信认证
auth_type PASS
auth_pass 1234
}
track_script {
Monitor_Nginx
}
virtual_ipaddress { // 配置VIP、子网掩码、VIP要游动的网卡
220.180.112.14/27 dev eth0
220.180.112.15/27 dev eth0
172.16.10.99/24 dev eth1
}
}
（备keepalived 上的配置）
! Configuration File for keepalived
global_defs {
notification_email {
root@189.com
}
notification_email_from root@189.cn
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script Monitor_Nginx {
script "/usr/local/scripts/nginx_pid.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth1
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1234
}
track_script {
Monitor_Nginx
}
virtual_ipaddress {
220.180.112.14/27 dev eth0
220.180.112.15/27 dev eth0
172.16.10.99/24 dev eth1
}
}
（/usr/local/scripts/nginx_pid.sh脚本的内容）
#!/bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then // 判断nginx是否未启用
/usr/local/nginx/sbin/nginx // 运行nginx
sleep 3
if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
//3秒后检测，如果nginx启动出错就关闭keepalived
killall keepalived
fi
fi
4) Nginx配置
两台nginx的配置一样，如下：
userwww www;
worker_processes1;
#error_loglogs/error.log;
#error_loglogs/error.lognotice;
#error_loglogs/error.loginfo;
#pid logs/nginx.pid;
events {
use epoll;
worker_connections51200;
}
http {
include mime.types;
default_typeapplication/octet-stream;
log_formatmain'$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_loglogs/access.logmain;
sendfile on;
#tcp_nopush on;
#keepalive_timeout0;
keepalive_timeout65;
gzipon;
#####################################
# web
upstream web {
server 172.16.10.10;
server 172.16.10.11;
ip_hash;
}
# pic
upstream pic {
server 172.16.10.20;
server 172.16.10.21;
ip_hash;
}
# natip
upstream natip {
server 172.16.10.20:8080;
server 172.16.10.21:8080;
ip_hash;
}
#########################################
# web
server {
listen 80;
server_name www.abc.com;
location / {
proxy_pass http://web;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location /status {
stub_status on;
access_log off;
error_log off;
}
}
# pic
server {
listen 80;
server_name pic.abc.com;
location / {
proxy_pass http://pic;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location /status {
stub_status on;
access_log off;
error_log off;
}
}
# natip
server {
listen 8080;
server_name 172.16.10.4;
location / {
proxy_pass http://natip;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location /status {
stub_status on;
access_log off;
error_log off;
}
}
}
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