利用nginx的upstream实现负载均衡(带安装脚本)

1 系统信息

[root@lb-01-7 vhost]# cat /etc/redhat-release 

CentOS release 6.8 (Final)

[root@lb-01-7 vhost]# uname -r

2.6.32-642.el6.x86_64

2 环境

HOSTNAME	IP	说明
lb-01-7	10.0.0.7	Nginx主负载均衡器
web-01-9	10.0.0.9	web服务器
web-01-9	10.0.0.10	web服务器

软件：nginx-1.12.0

3 安装脚本

 #! /bin/bash

#  function :install nginx

SOFT_INSTALL_PATH=/usr/local

NGINX_VERSION=nginx-1.12.0

SOFT=/home/zyb/tools

function nginx_install()

{
# add user and group
groupadd www
useradd www -s /sbin/nologin -M -g www

# install Dependent package
yum install -y pcre pcre-devel openssl openssl-devel>>nginx.log

[ -d $SOFT ] && cd $SOFT || exit 1
tar -xf ${NGINX_VERSION}.tar.gz
cd ${NGINX_VERSION}
./configure --prefix=${SOFT_INSTALL_PATH}/${NGINX_VERSION} --user=www --group=www \
--with-http_sub_module --with-http_ssl_module  --with-http_stub_status_module >>nginx.log
[ $? == "0" ] && make >>nginx.log ||exit 1
make install >>nginx.log
ln -s ${SOFT_INSTALL_PATH}/${NGINX_VERSION} ${SOFT_INSTALL_PATH}/nginx
${SOFT_INSTALL_PATH}/${NGINX_VERSION}/sbin/nginx 
netstat -nlutp|grep 80

}

function nginx_config()

{

cat >${SOFT_INSTALL_PATH}/${NGINX_VERSION}/conf/nginx.conf<<EOF

user  www www;

worker_processes 8;

worker_cpu_affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000;

error_log  /home/wwwlogs/nginx_error.log  error;

pid        /home/wwwlogs/nginx.pid;

#Specifies the value for maximum file descriptors that can be opened by this process.

worker_rlimit_nofile 51200;

events

    {

        use epoll;

        worker_connections 10240;

        multi_accept on;

    }

http

    {

        include       mime.types;

        default_type  application/octet-stream;

        server_names_hash_bucket_size 128;

        client_header_buffer_size 32k;

        large_client_header_buffers 4 32k;

        client_max_body_size 50m; 
send_timeout 25;

        sendfile   on;

        tcp_nopush on;

        keepalive_timeout 60;

        tcp_nodelay on;

        fastcgi_connect_timeout 300;

        fastcgi_send_timeout 300;

        fastcgi_read_timeout 300;

        fastcgi_buffer_size 64k;

        fastcgi_buffers 4 64k;

        fastcgi_busy_buffers_size 128k;

        fastcgi_temp_file_write_size 256k;

        gzip on;

        gzip_min_length  1k;

        gzip_buffers     4 32k;

        gzip_http_version 1.1;

        gzip_comp_level 2;

        gzip_types     text/plain application/javascript application/x-javascript text/javascript text/css application/xml application/xml+rss;

        gzip_vary on;

        gzip_proxied   expired no-cache no-store private auth;

        gzip_disable   "MSIE [1-6]\.";

        #limit_conn_zone $binary_remote_addr zone=perip:10m;

        ##If enable limit_conn_zone,add "limit_conn perip 10;" to server section.

        log_format  main  '\$remote_addr - \$remote_user [\$time_local] "\$request" '

                    '$status $body_bytes_sent "\$http_referer" '

                    '"\$http_user_agent" "\$http_x_forwarded_for"';

        server_tokens off;

        include vhost/*.conf;

}

EOF

mkdir -p  /home/wwwlogs

chown www.www /home/wwwlogs

mkdir -p ${SOFT_INSTALL_PATH}/${NGINX_VERSION}/conf/vhost

${SOFT_INSTALL_PATH}/${NGINX_VERSION}/sbin/nginx -s reload

}

function add_server()

{

    cat >${SOFT_INSTALL_PATH}/${NGINX_VERSION}/conf/vhost/www.zyb.com.conf<<EOF

        server {

            listen 80;

            server_name www.zyb.com;

            location / {

                root html;

                index index.html index.htm;

            }

            access_log /home/wwwlogs/www.zyb.com.log main;

        }

EOF

}

nginx_install

nginx_config

add_server               

4 nginx配置

4.1 修改10.0.0.7 的nginx配置文件

       在nginx.conf 的http节点添加以下信息：

        log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '

                    '  "$http_referer" '

                    '"$http_user_agent" "$http_x_forwarded_for"';

        server_tokens off;

        upstream www_server_pools {

                server 10.0.0.9:80 weight=1;

                server 10.0.0.10:80 weight=1;

        }


    配置server节点

[root@lb-01-7 vhost]# cat www.zyb.com.conf 

        server {

            listen 80;

            server_name www.zyb.com;

            location / {

                proxy_pass http://www_server_pools;
                proxy_set_header Host $host;

                proxy_set_header X-Forwarded-For $remote_addr;

            }

            access_log /home/wwwlogs/www.zyb.com.log main;

        }


说明：

[b]  proxy_pass http://www_server_pools;      将访问请求发送给www_server_pools 里的节点

  proxy_set_header Host $host; 在代理向后服务器发送http请求加入host字段信息，用于当后端服务器配置有多个虚拟主机是，可以识别代理的哪一个虚拟主机。这是节点服务器多虚拟主机的关键配置。

  proxy_set_header X-Forwarded-For $remote_addr;   这是反向代理时，节点服务器获取用户真实的IP的必要功能配置[/b]

方向代理配置相关的更多参数说明

[b]                proxy_pass http://www_server_pools;
                proxy_set_header Host $host;

                proxy_set_header X-Forwarded-For $remote_addr;[/b]

proxy_connect_timeout 60;

proxy_send_timeout 60;

proxy_read_timeout 60;

proxy_buffer_size 4k;

proxy_buffers 4 32k;

proxy_busy_buffers_size 64k;

proxy_temp_file_write_size 64;