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
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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 $serverport
ENTRYPOINT ["dotnet","ServerProvider.dll"]
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Program.cs改动
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public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseUrls($"http://*:{Environment.GetEnvironmentVariable("serverport")}")
.UseStartup
();
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ValuesController.cs改动
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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> Get()
{
return new string[] { "this is serverprovider's result" };
}
}
}
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ServerConsumer项目
新增Dockerfile
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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 $consumerport
ENTRYPOINT ["dotnet","ServerComsumer.dll"]
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Program.cs改动
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public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseUrls($"http://*:{Environment.GetEnvironmentVariable("consumerport")}")
.UseStartup();
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ValueController.cs改动
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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> Get()
{
return new string[] { "value1", "value2" };
}
// GET api/values/5
[HttpGet("{id}")]
public async Task> 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();
}
}
}
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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）：
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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
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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
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[root@cys-test-centos WebDocker]# docker-compose down
Removing c_consumer ... done
Removing c_provider ... done
Removing network webdocker_default
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7.查看生成的镜像
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[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
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镜像名为：webdocker_s_provider与webdocker_s_consumer
8.修改docker-compose.yml文件
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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
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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-machinehttps://www.cnblogs.com/chenyishi/p/10000693.html
