Docker-Compose部署nginx代理Tomcat集群,实现负载均衡

程序员文章站 2022-06-07 09:09:13

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1、安装docker-compose

curl -L https://github.com/docker/compose/releases/download/1.17.0-rc1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose

chmod 755 !$

大体步骤分为以下四步

下载所需的文件tomcat,jdk
编写dockerfile来布署tomcat与java环境，生成镜像文件
编写docker-compose.yml配置文件，启动所有容器服务
测试负载均衡

(一)具体配置文件如下

#整个目录结构

[aaa@qq.com java]# tree ./

./

├── docker-compose.yml

├── etc

│   └── localtime

├── nginx

│   └── nginx.conf

├── tomcat

│   ├── apache-tomcat-8.5.31.tar.gz

│   ├── Dockerfile

│   └── jdk-8u144-linux-x64.tar.gz

└── webserver

    ├── tomcatA
    
    │   └── index.jsp
    
    └── tomcatB
    
        └── index.jsp

6 directories, 8 files

#两个测试首页文件

[aaa@qq.com java]# cat webserver/tomcatA/index.jsp 

welcome to tomcat-A server

[aaa@qq.com java]# cat webserver/tomcatB/index.jsp 

welcome to tomcat-B server

#配置文件

[aaa@qq.com java]# cat docker-compose.yml 

version: "3"

services:

  nginx:

    image: nginx:1.14
    
    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-8.5.31/webapps/ROOT
    
      - ./etc/localtime:/etc/localtime

  tomcat2:

    hostname: tomcat2
    
    build: ./tomcat
    
    volumes:
    
      - ./webserver/tomcatB:/usr/local/apache-tomcat-8.5.31/webapps/ROOT
    
      - ./etc/localtime:/etc/localtime

#安装JAVA环境

[aaa@qq.com java]# cat tomcat/Dockerfile 

FROM centos

ADD jdk-8u144-linux-x64.tar.gz /usr/local

ENV JAVA_HOME /usr/local/jdk1.8.0_144

ADD apache-tomcat-8.5.31.tar.gz /usr/local

EXPOSE 8080

ENTRYPOINT ["/usr/local/apache-tomcat-8.5.31/bin/catalina.sh", "run"]

#nginx.conf配置文档

[aaa@qq.com nginx]# cat nginx.conf

user  nginx;

worker_processes  1;

error_log  /var/log/nginx/error.log warn;

pid        /var/run/nginx.pid;

events {

    worker_connections  1024;

}

http {

    include       /etc/nginx/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  /var/log/nginx/access.log  main;
    
    client_max_body_size 10m;
    
    sendfile        on;
    
    #tcp_nopush     on;
    
    keepalive_timeout  65;
    
    #gzip  on;

upstream tomcat_client {

         server tomcat1:8080 weight=1;
    
         server tomcat2:8080 weight=1;
    
    }
    
    server {
    
        server_name "";
    
        listen 80 default_server;
    
        listen [::]:80 default_server ipv6only=on;
    
        location / {
    
            proxy_pass http://tomcat_client;
    
            proxy_redirect default;
    
            proxy_set_header Host $host;
    
            proxy_set_header X-Real-IP $remote_addr;
    
        }
    
    }

}