CentOS下Docker与.netcore(三）之 三剑客之一Docker-Compose

1.什么是docker-compose

我们讲了通过dockerfile创建镜像，这在一个小项目中是没问题的，但如果在一个包含多个项目的情况下，我们每次部署都需要执行多次创建镜像与运行容器的命令，这样就比较麻烦，为了解决这种情况，docker-compose出现了。docker-compose主要就是为了解决在一台服务器创建镜像与运行容器复杂的问题，有了docker-compose我们就可以通过一条命令，生成多镜像与运行容器。

2.docker-compose安装

sudo curl -l "https://github.com/docker/compose/releases/download/1.23.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

查看安装是否成功

3.创建两个.netcore项目，不启用https

serverprovider项目

新增dockerfile

from microsoft/dotnet:2.1-aspnetcore-runtime
maintainer yishi.chen

label description="this is a serverprovider website"
label version="1.0"

arg serverport

workdir /app
copy bin/release/netcoreapp2.1/publish/ .
expose $serverport
entrypoint ["dotnet","serverprovider.dll"]

program.cs改动

        public static iwebhostbuilder createwebhostbuilder(string[] args) =>
            webhost.createdefaultbuilder(args)
                .useurls($"http://*:{environment.getenvironmentvariable("serverport")}")
                .usestartup<startup>();

valuescontroller.cs改动

using system;
using system.collections.generic;
using system.linq;
using system.threading.tasks;
using microsoft.aspnetcore.mvc;

namespace serverprovider.controllers
{
    [route("api/[controller]")]
    [apicontroller]
    public class valuescontroller : controllerbase
    {
        // get api/values
        [httpget]
        public actionresult<ienumerable<string>> get()
        {
            return new string[] { "this is serverprovider's result" };
        }

    }
}

serverconsumer项目

新增dockerfile

from microsoft/dotnet:2.1-aspnetcore-runtime
maintainer yishi.chen

label description="this is a serverconsumer website"
label version="1.0"

arg consumerport

workdir /app
copy bin/release/netcoreapp2.1/publish/ .
expose $consumerport
entrypoint ["dotnet","servercomsumer.dll"]

program.cs改动

        public static iwebhostbuilder createwebhostbuilder(string[] args) =>
            webhost.createdefaultbuilder(args)
                .useurls($"http://*:{environment.getenvironmentvariable("consumerport")}")
                .usestartup<startup>();

valuecontroller.cs改动

using system;
using system.collections.generic;
using system.linq;
using system.net.http;
using system.net.http.headers;
using system.threading.tasks;
using microsoft.aspnetcore.mvc;

namespace servercomsumer.controllers
{
    [route("api/[controller]")]
    [apicontroller]
    public class valuescontroller : controllerbase
    {
        // get api/values
        [httpget]
        public actionresult<ienumerable<string>> get()
        {
            return new string[] { "value1", "value2" };
        }

        // get api/values/5
        [httpget("{id}")]
        public async task<actionresult<string>> get(int id)
        {
            var httpclient = new httpclient();
            httpclient.defaultrequestheaders.accept.add(new mediatypewithqualityheadervalue("application/json"));
            return await httpclient.getasync(environment.getenvironmentvariable("serverurl")).result.content.readasstringasync();
        }
    }
}

新建docker-compose.yml编排文件

内容如下（docker-compose的配置请见）：

version: '3'
services:
  s_provider:
    build:
      context: ./serverprovider/
      dockerfile: dockerfile
      args:
        serverport: 1000
    ports:
      - "1000:1000"
    environment:
      serverport: 1000
    container_name: c_provider
  s_consumer:
    build:
      context: ./servercomsumer/
      dockerfile: dockerfile
      args:
        consumerport: 2000
    ports:
      - "2000:2000"
    links:
      - s_provider:s_provider
    environment:
      consumerport: 2000
      serverurl: http://s_provider:1000/api/values/
    container_name: c_consumer

 4.定位到docker-compose文件所在目录，运行docker-compose

[root@cys-test-centos webdocker]# docker-compose up

运行成功，状态如下：

5.另起一个命令窗口，测试接口

[root@cys-test-centos ~]# curl http://localhost:1000/api/values
["this is serverprovider's result"]

root@cys-test-centos ~]# curl http://localhost:2000/api/values
["value1","value2"]

[root@cys-test-centos ~]# curl http://localhost:2000/api/values/1
["this is serverprovider's result"]

以上是通过docker-compose 新建镜像，并运行容器，如果镜像已存在，则可以去掉构建的过程，我们稍微对docker-compose文件做一下调整

6.在上面步骤的前提下，先ctrlc停止容器，然后docker-compsoe down删除容器

[root@cys-test-centos webdocker]# docker-compose down
removing c_consumer ... done
removing c_provider ... done
removing network webdocker_default

7.查看生成的镜像

[root@cys-test-centos webdocker]# docker images
repository             tag                      image id            created             size
webdocker_s_consumer   latest                   cc95654856e1        17 minutes ago      253mb
webdocker_s_provider   latest                   5b744758b56b        17 minutes ago      253mb
microsoft/dotnet       2.1-aspnetcore-runtime   db366d73508b        4 days ago          253mb

镜像名为：webdocker_s_provider与webdocker_s_consumer

8.修改docker-compose.yml文件

version: '3'
services:
  s_provider:
    image: webdocker_s_provider
    ports:
      - "1000:1000"
    environment:
      serverport: 1000
    container_name: c_provider
  s_consumer:
    image: webdocker_s_consumer
    ports:
      - "2000:2000"
    links:
      - s_provider:s_provider
    environment:
      consumerport: 2000
      serverurl: http://s_provider:1000/api/values/
    container_name: c_consumer

9.验证接口

[root@cys-test-centos ~]# curl http://localhost:2000/api/values/1
["this is serverprovider's result"]

 

到此docker-compose介绍完毕，下一章讲docker三剑客之docker-machine