Linux搭建nginx负载均衡服务器

1. nginx下载

官网：http://nginx.org/en/download.html

2. 上传到服务器

可以选择rz命令上传，也可以选择SFTP上传都可以。

3. 安装相关依赖

[root@dbnewyouth ~]# yum install gcc-c++
[root@dbnewyouth ~]# yum install -y pcre pcre-devel
[root@dbnewyouth ~]# yum install -y zlib zlib-devel
[root@dbnewyouth ~]# yum install -y openssl openssl-devel

4. 解压nginx安装包

[root@dbnewyouth ~]# tar -zxvf nginx-1.15.1.tar.gz

5. 进行配置

首先要进入解压后的nginx目录，然后复制下面一段即可
./configure \
--prefix=/usr/local/nginx \
--pid-path=/var/run/nginx/nginx.pid \
--lock-path=/var/lock/nginx.lock \
--error-log-path=/var/log/nginx/error.log \
--http-log-path=/var/log/nginx/access.log \
--with-http_gzip_static_module \
--http-client-body-temp-path=/var/temp/nginx/client \
--http-proxy-temp-path=/var/temp/nginx/proxy \
--http-fastcgi-temp-path=/var/temp/nginx/fastcgi \
--http-uwsgi-temp-path=/var/temp/nginx/uwsgi \
--http-scgi-temp-path=/var/temp/nginx/scgi

6. 编译并安装

[root@dbnewyouth ~]# make && make install

7. 启动nginx

进入sbin目录
[root@dbnewyouth sbin]# ./nginx
关闭nginx：
[root@dbnewyouth sbin]# ./nginx -s stop
推荐使用：
[root@dbnewyouth sbin]# ./nginx -s quit

8. 配置虚拟主机

配置文件位置：/usr/local/nginx/conf/nginx.conf
通过端口划分

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
        }
    }
    server {
        listen       81;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html-81;
            index  index.html index.htm;
        }
    }
}

通过域名划分

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
        }
    }
    server {
        listen       81;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html-81;
            index  index.html index.htm;
        }
    }
    server {
        listen       80;
        server_name  www.taobao.com;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html-taobao;
            index  index.html index.htm;
        }
    }
    server {
        listen       80;
        server_name  www.baidu.com;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html-baidu;
            index  index.html index.htm;
        }
    }
}

10. 更改配置文件后，重新加载配置文件生效

[root@dbnewyouth sbin]# nginx -s reload

11. 配置反向代理服务器
    第一步：安装两个Tomcat，端口号分别为8080,8090（端口号自己随意）
    第二步：分别启动两个Tomcat
    第三步：反向代理服务器的配置

upstream tomcat1 {
    server 192.168.25.148:8080;
    }
    server {
        listen       80;
        server_name  www.sina.com.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://tomcat1;
            index  index.html index.htm;
        }
    }
    upstream tomcat2 {
    server 192.168.25.148:8090;
    }
    server {
        listen       80;
        server_name  www.sohu.com;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            proxy_pass   http://tomcat2;
            index  index.html index.htm;
        }
    }

第四步：重新加载配置文件（如10）
第五步：在host文件中加入ip和对应域名，测试可以，正式环境请路过这里

12. 配置负载均衡
    分配权重即可

upstream tomcat2 {
    server 192.168.25.148:8081 weifht=3;
    server 192.168.25.148:8082 weight=2;
}