CentOS下Docker與.netcore(三）之三劍客之一Docker-Compose

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1.什麼是Docker-Compose 上一章我們講了通過Dockerfile創建鏡像，這在一個小項目中是沒問題的，但如果在一個包含多個項目的情況下，我們每次部署都需要執行多次創建鏡像與運行容器的命令，這樣就比較麻煩，為瞭解決這種情況，Docker-Compose出現了。Docker-Compose ...

1.什麼是Docker-Compose

上一章我們講了通過Dockerfile創建鏡像，這在一個小項目中是沒問題的，但如果在一個包含多個項目的情況下，我們每次部署都需要執行多次創建鏡像與運行容器的命令，這樣就比較麻煩，為瞭解決這種情況，Docker-Compose出現了。Docker-Compose主要就是為瞭解決在一臺伺服器創建鏡像與運行容器複雜的問題，有了Docker-Compose我們就可以通過一條命令，生成多鏡像與運行容器。

2.Docker-Compose安裝

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

查看安裝是否成功

3.創建兩個.netcore項目，不啟用https

ServerProvider項目

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改動

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseUrls($"http://*:{Environment.GetEnvironmentVariable("serverport")}")
                .UseStartup<Startup>();

ValuesController.cs改動

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項目

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改動

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseUrls($"http://*:{Environment.GetEnvironmentVariable("consumerport")}")
                .UseStartup<Startup>();

ValueController.cs改動

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編排文件

內容如下（docker-compose的配置請見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文件所在目錄，運行docker-compose

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

運行成功，狀態如下：

5.另起一個命令視窗，測試介面

[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"]

以上是通過docker-compose 新建鏡像，並運行容器，如果鏡像已存在，則可以去掉構建的過程，我們稍微對docker-compose文件做一下調整

6.在上面步驟的前提下，先CtrlC停止容器，然後docker-compsoe down刪除容器

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

7.查看生成的鏡像

[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

鏡像名為：webdocker_s_provider與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.驗證介面

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

到此Docker-Compose介紹完畢，下一章講Docker三劍客之Docker-machine

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