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CentOS6.5环境如何安装nginx服务器及配置负载均衡
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本文实例讲述了CentOS6.5环境安装nginx服务器及负载均衡配置操作。分享给大家供大家参考，具体如下：
1、下载PCRE， 是一个用C语言编写的正则表达式函数库
[root@localhost pcre-8.36]# cd /tmp/download/ [root@localhost download]# wget http://nchc.dl.sourceforge.net/project/pcre/pcre/8.37/pcre-8.37.tar.gz [root@localhost download]# tar zxvf pcre-8.36.tar.gz
2、下载zlib库
[root@localhost pcre-8.36]# cd /tmp/download/ [root@localhost download]# wget http://ncu.dl.sourceforge.net/project/libpng/zlib/1.2.8/zlib-1.2.8.tar.gz [root@localhost download]# tar -zxvf zlib-1.2.8.tar.gz cd zlib-1.2.8
4、下载SSL
[root@localhost zlib-1.2.8]# cd .. [root@localhost download]# wget http://www.openssl.org/source/openssl-1.0.1p.tar.gz [root@localhost download]# cd openssl-1.0.1c [root@localhost openssl-1.0.1c]# tar -zxvf openssl-1.0.1c.tar.gz
5、下载nginx
[root@localhost download]# wget http://nginx.org/download/nginx-1.2.8.tar.gz [root@localhost download]# tar -zxvf nginx-1.2.8.tar.gz
6、安装
[root@localhost download]mv pcre-8.36 /usr/local/ [root@localhost download]mv zlib-1.2.8 /usr/local/ [root@localhost download]mv openssl-1.0.1c /usr/local/ [root@localhost download]mv nginx-1.2.8 /usr/local/ [root@localhost download]cd /usr/local/ [root@localhost local]# cd pcre-8.36 [root@localhost pcre-8.36]# ./configure&&make&&make install [root@localhost pcre-8.36] cd ../zlib-1.2.8 [root@localhost zlib-1.2.8]# ./configure && make && make install [root@localhost zlib-1.2.8]# cd ../openssl-1.0.1c [root@localhost openssl-1.0.1c]# ./config && make && make install [root@localhost openssl-1.0.1c]# cd ../nginx-1.2.8 [root@localhost nginx-1.2.8]# ./configure --prefix=/usr/local/nginx && make && make install
7、启动nginx
[root@localhost nginx]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
8、测试
在确保可以连接到服务器的电脑上，浏览器输入装了nginx的机器的ip地址，会看到Welcome to nginx!的提示说明安装配配置成功了。
9、设置开机自动启动（shell脚本处理）
[root@localhost logs]# vi /etc/init.d/nginx
添加以下shell脚本。
#!/bin/bash
# nginx Startup script for the Nginx HTTP Server
# it is v.0.0.2 version.
# chkconfig: - 85 15
# description: Nginx is a high-performance web and proxy server.
# It has a lot of features, but it's not for everyone.
# processname: nginx
# pidfile: /var/run/nginx.pid
# config: /usr/local/nginx/conf/nginx.conf
nginxd=/usr/local/nginx/sbin/nginx
nginx_config=/usr/local/nginx/conf/nginx.conf
nginx_pid=/var/run/nginx.pid
RETVAL=0
prog="nginx"
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
[ -x $nginxd ] || exit 0
# Start nginx daemons functions.
start() {
if [ -e $nginx_pid ];then
echo "nginx already running...."
exit 1
fi
echo -n $"Starting $prog: "
daemon $nginxd -c ${nginx_config}
RETVAL=$?
echo
[ $RETVAL = 0 ] && touch /var/lock/subsys/nginx
return $RETVAL
}
# Stop nginx daemons functions.
stop() {
echo -n $"Stopping $prog: "
killproc $nginxd
RETVAL=$?
echo
[ $RETVAL = 0 ] && rm -f /var/lock/subsys/nginx /var/run/nginx.pid
}
# reload nginx service functions.
reload() {
echo -n $"Reloading $prog: "
#kill -HUP `cat ${nginx_pid}`
killproc $nginxd -HUP
RETVAL=$?
echo
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
reload)
reload
;;
restart)
stop
start
;;
status)
status $prog
RETVAL=$?
;;
*)
echo $"Usage: $prog {start|stop|restart|reload|status|help}"
exit 1
esac
exit $RETVAL保存后，设置权限让所有人可以操作。
[root@localhost ~]# chmod a+x /etc/init.d/nginx [root@localhost logs]# /etc/init.d/nginx status nginx (pid 2417 2416) is running... [root@localhost logs]# /etc/init.d/nginx stop Stopping nginx: [ OK ] [root@localhost logs]# /etc/init.d/nginx start Starting nginx: [ OK ] [root@localhost logs]# /etc/init.d/nginx status nginx (pid 2454 2452) is running... [root@localhost ~]# vi /etc/rc.local
添加：
/etc/init.d/nginx start
重启电脑就会生效。
注意：脚本里面关于启动目录的，如果你的安装地址不一样，要进行修改。
负载均衡配置：
现有两部服务器：
192.168.137.197 （按照以上操作安装有nginx，作为转发机，虚拟机）
192.168.137.33 （无安装nginx，运行有测试用的web工程，虚拟机）
10.10.33.59 （无安装nginx，运行有测试用的web工程，本地电脑地址）
，运行有测试用的web工程
127.0.0.1 web_app
[root@a conf]# vi /usr/local/nginx/conf/nginx.conf
配置如下展示：
worker_processes 8;
pid /usr/local/nginx/nginx.pid;
worker_rlimit_nofile 102400;
events
{
use epoll;
worker_connections 102400;
}
http
{
include mime.types;
default_type application/octet-stream;
fastcgi_intercept_errors on;
charset utf-8;
server_names_hash_bucket_size 128;
client_header_buffer_size 4k;
large_client_header_buffers 4 32k;
client_max_body_size 300m;
sendfile on;
tcp_nopush on;
keepalive_timeout 60;
tcp_nodelay on;
client_body_buffer_size 512k;
proxy_connect_timeout 5;
proxy_read_timeout 60;
proxy_send_timeout 5;
proxy_buffer_size 16k;
proxy_buffers 4 64k;
proxy_busy_buffers_size 128k;
proxy_temp_file_write_size 128k;
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.1;
gzip_comp_level 2;
gzip_types text/plain application/x-javascript text/css application/xml;
gzip_vary on;
###2012-12-19 change nginx logs
log_format main '$http_x_forwarded_for - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" $request_time $remote_addr';
upstream web_app {
server 192.168.137.197:8080 weight=1 max_fails=2 fail_timeout=30s;
server 192.168.137.33:8080 weight=1 max_fails=2 fail_timeout=30s;
server 10.10.33.59:8080 weight=1 max_fails=2 fail_timeout=30s;
}
####chinaapp.sinaapp.com
server {
listen 80;
server_name chinaapp.sinaapp.com;
index index.jsp index.html index.htm;
#发布目录/data/www
root /data/www;
location /
{
proxy_next_upstream http_502 http_504 error timeout invalid_header;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://web_app;
expires 3d;
}
}
}设置host：
[root@a conf]# vi /etc/hosts
添加hosts：
127.0.0.1 web_app
启动nginx
[root@localhost nginx]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
启动三部服务器的web应用：
在192.168.137.197执行指令：
[root@a PROGRAM]# curl "http://web_app/index.jsp"
测试结果如下：
常见问题及解决办法：
1、安装PCRE时提示configure: error: You need a C++ compiler for C++ support.
原因是没有安装c++编译器，采用下面的命令安装：
[root@localhost pcre-8.37]# yum install -y gcc gcc-c++
2、启动nginx失败
[root@localhost nginx]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf /usr/local/nginx/sbin/nginx: error while loading shared libraries: libpcre.so.1: cannot open shared object file: No such file or directory
原因是64bit的系统，但是默认取了/usr/local/lib里面的包
检查方法：
[root@localhost nginx]# cd /usr/local/ [root@localhost local]# ls /lib64/ |grep pcre libpcre.so.0 libpcre.so.0.0.1 [root@localhost local]# ls /lib/ |grep pcre
说明缺失的包在lib64
设置软连接来解决：
[root@localhost local]# ln -s /lib64/libpcre.so.0.0.1 /lib64/libpcre.so.1 [root@localhost local]# cd nginx [root@localhost nginx]# /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
3、启动报错：
报错：nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
解决办法：sudo fuser -k 80/tcp
端口被占用，关闭占用端口
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