Nginx+Tomcat多实例及负载均衡配置

Nginx+Tomcat多实例及负载均衡配置

采用nginx的反向代理负载均衡功能，配合后端的tomcat多实例来实现tomcat WEB服务的负载均衡

01

安装nginx服务

安装所需的pcre库

 tar zxf pcre-8.38.tar.gz

cd pcre-8.38

./configure 

make && make install

cd ../

编译安装Nginx服务

tar zxf nginx-1.11.3.tar.gz

cd nginx-1.11.3

useradd nginx -s /sbin/nologin -M

yum install openssl openssl-devel -y

./configure –user=nginx –group=nginx –prefix=/application/nginx-1.11.3 –with-http_ssl_module –with-http_stub_status_module 

make && make install

nginx服务的相关介绍及编译参数介绍可参考公众号前面的文章，有关服务的详细配置说明都有涉及到

02

安装JDK环境

Tomcat需要JDK的环境，因此在安装之前需要先安装JDK环境，首先下载好相应的JDK软件包

tar xf jdk-8u60-linux-x64.tar.gz -C /application/

        ##无需编译直接解压到指定目录

ln -s /application/jdk1.8.0_60 /application/jdk

        ##创建软链接

sed -i.ori ‘$a export JAVA_HOME=/application/jdknexport PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATHnexport CLASSPATH=.$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar’ /etc/profile           

    **  ##配置环境变量**

source /etc/profile             

     ** ##生效配置的环境变量**

java -version                      

      ##查看JDK环境安装是否成功

03    

安装配置Tomcat多实例

Tomcat的多实例配置也相当的简单，下载相应版本的软件，解压即可使用

tar xf apache-tomcat-8.0.27.tar.gz -C /application/

ln -s /application/apache-tomcat-8.0.27 /application/tomcat

echo ‘export TOMCAT_HOME=/application/tomcat’/etc/profile

多实例安装配置如下

cp -a apache-tomcat-8.0.27 /application/tomcat8_1

cp -a apache-tomcat-8.0.27 /application/tomcat8_2

切换到相关目录修改相应的配置文件即可

（两个实例的配置文件改动的地方相同，只需要修改端口与站点目录即可）

cd /application/tomcat8_2/conf/

diff /application/tomcat/conf/server.xml ./server.xml

22c22

Server port=”8005” shutdown=”SHUTDOWN”

---

Server port=”8012” shutdown=”SHUTDOWN”

69c69

    Connector port=”8080” protocol=”HTTP/1.1”

---

    Connector port=”8082” protocol=”HTTP/1.1”

123c123

      Host name=”localhost”  appBase=”webapps”

---

      Host name=”localhost”  appBase=”/web/www/bbs”

创建站点目录

mkdir /web/www/{www,bbs}/ROOT -p

echo “hello”/web/www/www/ROOT/index.jsp

echo “world”/web/www/bbs/ROOT/index.html

启动多实例

/application/tomcat8_1/bin/startup.sh

/application/tomcat8_2/bin/startup.sh

04

配置nginx

vim /application/nginx/conf/nginx.conf

#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;

upstream web_pools {

        server 127.0.0.1:8081;

        server 127.0.0.1:8082;

        }

    server {

        listen       80;

        server_name  localhost;

        location / {

            root   html;

            index  index.jsp index.html index.htm;

            proxy_pass http://web_pools;

        }

     }

}

查检语法与启动nginx服务

/application/nginx/sbin/nginx -t

/application/nginx/sbin/nginx

05

测试负载均衡效果

for i in echo {1..6};do curl 192.168.1.129;done

hello

world

hello

world

hello

world

表明负载均衡配置已经实现