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

CentOS下Docker与.netcore(一) 之 安装 

CentOS下Docker与.netcore(二) 之 Dockerfile

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

CentOS下Docker与.netcore(四）之 三剑客之一Docker-machine+jenkins简单自动化部署

CentOS下Docker与.netcore(五）之 三剑客之一Docker-swarm集群 

1.什么是Docker-Compose

上一章我们讲了通过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https://www.cnblogs.com/chenyishi/p/9965479.html）：

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