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

2018-11-22 14:05 716 查看

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

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