Nginx+Tomcat实现负载均衡!

设备：安装两台Tomcat一台Nginx

tomcat1：IP为192.168.200.130

tomcat2：IP为192.168.200.122

nginx：IP为192.168.200.111

两台tomcat操作一致

一：安装配置Tomcat

 上传jdk源码包

[root@localhost ~]rz -E

jdk-8u191-linux-x64.tar.gz 

[root@localhost ~]#tar  xf  jdk-8u191-linux-x64.tar.gz                                

[root@localhost ~]#mv  jdk-8u191-linux-x64/ /usr/local/java                       //解压放到/usr/local/下取名为java

 上传tomcat源码包

[root@localhost ~]rz -E

apache-tomcat-8.5.40.tar.gz

[root@localhost ~]#tar xf  apache-tomcat-8.5.40.tar.gz                                                   

[root@localhost ~]#mv apache-tomcat/  /usr/local/tomcat                            //将解包的目录放到/usr/local/取名为tomcat 

环境配置

[root@localhost ~]#vim  /etc/profile                                                                                                                  

在末尾添加  如下代码：   

export JAVA_HOME=/usr/local/java
export JRE_HOME=/usr/local/java/jre
export PATH=$PATH:/usr/local/java/bin
export CLASSPATH=./:/usr/local/java/lib:/usr/local/java/jre/lib

[root@localhost ~]#source /etc/profile                              //source执行文件

[root@localhost ~]#java  -version                                      //查看JAVA旧版本号

[root@localhost ~]# rm -rf /usr/bin/java                             //删除JAVA旧版本号

[root@localhost ~]#source /etc/profile                              //source执行文件

[root@localhost ~]#java  -version                                      //查看JAVA新版本号

[root@localhost ~]# cd /usr/local/tomcat/webapps/ROOT/
[root@localhost ROOT]# ls
asf-logo.png            bg-nav-item.png     favicon.ico            tomcat.css     tomcat.svg
asf-logo-wide.gif     bg-nav.png             index.jsp                tomcat.gif       WEB-INF
bg-button.png         bg-upper.png          tomcat.png
bg-middle.png        build.xml                RELEASE-NOTES.txt      tomcat-power.gif

 [root@localhost ROOT]# cp index.jsp index.jsp.bak                                        

[root@localhost ROOT]# echo "192.168.200.130" > index.jsp                 #第一台tomcat

[root@localhost ROOT]# echo "192.168.200.122" > index.jsp                #第二台tomcat

开启Tomcat服务

[root@localhost ~]#/usr/local/tomcat/bin/startup.sh   

Tomcat端口为8080                   

[root@localhost ~]# netstat -lnpt | grep :8080 

关闭防火墙

[root@localhost ~]# systemctl stop firewalld

[root@localhost ~]# iptables -F

[root@localhost ~]# setenforce 0

                             

安装Nginx

安装Nginx依赖包 openssl-devel是安装ssl必要的模块

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

创建用户是必做的，nginx通过用户来操作文件 

[root@localhost ~]#useradd -M -s /sbin/nologin nginx 

上传Nginx源码包

[root@localhost ~]# rz -E
z waiting to receive.**B0100000023be50                                             

[root@localhost ~]# tar xf nginx-1.14.2.tar.gz -C /usr/src
[root@localhost ~]# cd /usr/src/nginx-1.14.2/                                     

[root@localhost ~nginx-1.14.2/]#./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_stub_status_module  && make && make install                                                

 --prefix 设定Nginx的安装目录

 --user和--group 指定Nginx运行用户和组

 --with-http_stub_status_module 启用http_stub_status_module模块以支持状态统计

 --with-http_ssl_module 启用SSL模块

 --with-http_flv_module 启用FLV模块，提供寻求内存使用基于时间的偏移量文件

为主程序 nginx  创建链接文件
[root@localhost ~]# ls /usr/local/nginx/
conf   html  logs     sbin

[root@localhost ~]#ln -sf /usr/local/nginx/sbin/nginx  /usr/local/sbin/                   //做Nginx的软连接，为了更方便的找到配置文件位置

 [root@localhost ~]# ll /usr/local/sbin/nginx 
lrwxrwxrwx. 1 root root 27 9月 10 17:12 /usr/local/sbin/nginx -> /usr/local/nginx/sbin/nginx

编写便于service管理的脚本

[root@localhost ~]# vim /etc/init.d/nginx

#!/bin/bash
# chkconfig: 2345 99 20
# description: Nginx Server Control Scripts shell
PROG="/usr/local/nginx/sbin/nginx"
PIDF="/usr/local/nginx/logs/nginx.pid"


case "$1" in
start)
$PROG
;;
stop)
kill -s QUIT $(cat $PIDF)
;;
restart)
$0 stop
$0 start
;;
reload)
kill -s HUP $(cat $PIDF)
;;
*)
echo "Usage: $0 {start|stop|restart|reload}"
exit 1
esac
exit 0

 [root@localhost ~]# chmod +x /etc/init.d/nginx

[root@localhost ~]# cd /usr/local/nginx/conf/
[root@localhost conf]# ls
fastcgi.conf                  koi-utf      nginx.conf        scgi_params.default
fastcgi.conf.default      koi-win     uwsgi_params
fastcgi_params           mime.types    nginx.conf.default      uwsgi_params.default
fastcgi_params.default    mime.types.default       scgi_params   win-utf

[root@localhost conf]# cp nginx.conf nginx.conf.bak                                

Nginx  修改主配置文件

[root@localhost ~]# vim /usr/local/nginx/conf/nginx.conf

user  nginx nginx;
worker_processes  2;

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

pid        logs/nginx.pid;


events {
    use epoll;
    worker_connections  10240;
}


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;

   upstream tomcat_server {                                  #线程池规定IP号及权重
    server 192.168.200.130:8080 weight=2;                    #weight表示权重，权重越高，越高被分配的几率越高
    server 192.168.200.122:8080 weight=1;                

}


    server {
        listen       80;
        server_name  localhost;

        charset utf-8;

        access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
       proxy_pass http://tomcat_server;                         #线程池名
        proxy_set_header Host $http_host;                       #此处要添加host头，将头信息返回服务器,不加host可能报400错误

        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

    }

}

[root@localhost conf]# nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful

[root@localhost conf]# nginx
[root@localhost conf]# nginx -HUP nginx

[root@localhost conf]# netstat -anpt | grep :80
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 16275/nginx: master

关闭防火墙

[root@localhost ~]# systemctl stop firewalld

[root@localhost ~]# iptables -F

[root@localhost ~]# setenforce 0

测试两台tomcat同时运行：