docker-compose搭建nginx负载均衡+JVM平台

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#nginx #tomcat #java #docker

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本文详细介绍如何在CentOS 8环境下搭建Tomcat集群，并通过Nginx实现负载均衡。内容涵盖准备工作、目录树建立、Docker Compose编排及负载均衡测试等关键步骤。

一、准备工作
1.下载文件 apache-tomcat-8.5.59.tar.gz jdk-8u271-linux-x64.tar.gz
2.开放80、8080端口并拉取相关镜像

[root@Centos8 ~]# docker pull centos:latest nginx:latest tomcat:latest

二、建立相关目录树

[root@Centos8 ~]# mkdir ~/jvm
[root@Centos8 ~]# cat > ~/jvm/docker-compose.yml << EOF
>version: "3"
>services:
>  nginx:
>    image: nginx:latest
>    restart: always
>    ports:
>      - 80:80
>    links:
>      -tomcat1:tomcat1
>      -tomcat2:tomcat2
>    volumes:
>      - ./webserver:/webserver
>      - ./nginx/nginx.conf:/etc/nginx/nginx.conf
>      - ./etc/localtime:/etc/localtime
>    depends_on:
>      - tomcat1
>      - tomcat2
>  tomcat1:
>    hostname: tomcat1
>    build: ./tomcat
>    volumes:
>      - ./webserver/tomcatA:/usr/local/apache-tomcat-8.5.59/webapps/ROOT
>      - ./etc/localtime:/etc/localtime
>  tomcat2:
>    hostname: tomcat2
>    build: ./tomcat
>    volumes:
>      - ./webserver/tomcatB:/usr/local/apache-tomcat-8.5.59/webapps/ROOT
>      - ./etc/localtime:/etc/localtime
>EOF
[root@Centos8 ~]# mkdir ~/jvm/etc
[root@Centos8 ~]# cp /etc/localtime ~/jvm/etc/
[root@Centos8 ~]# mkdir ~/jvm/nginx
[root@Centos8 ~]# cat > ~/jvm/nginx/nginx.conf << EOF
>worker_processes 1;
>events {
>    worker_connections 1024;
>}
>http {
>    upstream webserver  {         //开启负载均衡模块
>	 ip_hash;                     //固定ip负载
>    server   172.19.0.3:8080 weight=2;     //按权重均衡，地址为之后新建的两个tomcat容器ip
>	 server   172.19.0.4:8080 weight=8;
>    }
>    server {
>        listen   80;
>        server_name  127.0.0.1;        
>	     location / {
>             proxy_pass http://webserver;
>	     }
>     }
>}
>EOF
[root@Centos8 ~]# mkdir ~/jvm/tomcat
[root@Centos8 ~]# cat > ~/jvm/tomcat/Dockerfile << EOF
>FROM centos:latest
>ADD jdk-8u271-linux-x64.tar.gz /usr/local
>ENV JAVA_HOME /usr/local/jdk1.8.0_271
>ADD apache-tomcat-8.5.59.tar.gz /usr/local
>EXPOSE 8080
>ENTRYPOINT ["/usr/local/apache-tomcat-8.5.59/bin/catalina.sh","run"]
>EOF
[root@Centos8 ~]# mkdir ~/jvm/webserver
[root@Centos8 ~]# cat > ~/jvm/webserver/tomcatA/index.jsp << EOF
>This is tomcat-A server.
>EOF
[root@Centos8 ~]# cat > ~/jvm/webserver/tomcatB/index.jsp << EOF
>This is tomcat-B server.
>EOF

最终目录树如下：

[root@Centos8 jvm]# tree
.
├── docker-compose.yml
├── etc
│   └── localtime
├── nginx
│   └── nginx.conf
├── tomcat
│   ├── apache-tomcat-8.5.59.tar.gz
│   ├── Dockerfile
│   └── jdk-8u271-linux-x64.tar.gz
└── webserver
    ├── tomcatA
    │   └── index.jsp
    └── tomcatB
        └── index.jsp

三、docker-compose进行编排

[root@Centos8 jvm]# docker-compose up -d

查看容器启动情况

[root@Centos8 jvm]# docker-compose ps

包含jvm_nginx_1、jvm_tomcat1_1、jvm_tomcat2_1三个容器
查看容器ip

docker inspect | grep IPAddress jvm_tomcat1_1

四、测试负载均衡

[root@Centos8 jvm]# curl http://localhost