原精

.netcore 通过Flurl验证k8s内部访问与获取环境变量

7178人阅读 2020/4/14 10:52 总访问：3223937 评论：0 收藏：1 手机

分类: 容器编排

![Kubernetes](https://img.tnblog.net/arcimg/hb/4027cd04790f47abbb576c3daffe67f4.png "Kubernetes")


>#.netcore验证k8s内部访问与获取环境变量
[TOC]


 
创建k8s-name项目
------------
 
>#### 项目结构如下

![k8s-name的项目结构](https://img.tnblog.net/arcimg/hb/a679ae5d08e24eed948070f287b43ec7.png "k8s-name的项目结构")
 
>#### 实验过程


```flow
st=>start: k8s-demo项目为起始点|current
op=>operation: 请求ValuesController控制器Get接口|approved:>https://k8s-demo/Values[blank]
op1=>operation: 执行框2|
in=>inputoutput: 通过INameService接口去请求name-api数据|approved:>https://name-api/Values[blank]
cond=>condition: 请求结果
e=>operation: 报错|past
e2=>end: 返回结果|past
st->op->in->cond
cond(no)->e
cond(yes)->op1->e2
```

>#### 环境设置

安装 Flurl 相关包
```bash
dotnet add package Flurl --version 3.0.0-pre3
dotnet add package Flurl.Http --version 3.0.0-pre3
```

>#### 内容如下

 
**INameService.cs**
 
```csharp
public interface INameService
{
	Task<string> GetName();
}
```

 
**NameService.cs**
 
```csharp
public class NameService:INameService
{
	private readonly string _nameUrl = "http://name-api/name";

	public async Task<string> GetName()
	{
		return await _nameUrl.GetStringAsync();
	}
}
```

 
**Startup.cs**-->**ConfigureServices**
 
```csharp
public void ConfigureServices(IServiceCollection services)
{
	services.AddControllers();
	services.AddSingleton<INameService,NameService>();
}
```

 
**ValuesController.cs**
 
```csharp
[ApiController]
[Route("[controller]")]
public class ValuesController : ControllerBase
{
 private readonly INameService _nameService;
 public ValuesController(INameService nameService){
 _nameService = nameService;
 }

 [HttpGet]
 public async Task<ActionResult<string>> Get(){
 return "hello," + await _nameService.GetName();
 }
}
```

 
**Dockerfile**
 
```bash
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
WORKDIR /src
COPY . k8s-demo/
RUN pwd
RUN ls
RUN dotnet restore "k8s-demo/k8s-demo.csproj"
COPY . .
WORKDIR "/src/k8s-demo"
RUN pwd
RUN ls
RUN mkdir -p /app/build
RUN mkdir -p /app/publish
RUN dotnet build "k8s-demo.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "k8s-demo.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "k8s-demo.dll"]
```

 
**Deploy.yaml**
 
```bash
apiVersion: apps/v1
kind: Deployment
metadata:
 name: k8s-demo
 namespace: netcore
 labels:
 name: k8s-demo
spec:
 replicas: 2
 selector:
 matchLabels:
 name: k8s-demo
 template:
 metadata:
 labels:
 name: k8s-demo
 spec:
 containers:
 - name: k8s-demo
 image: aidasi/k8sdemoapi:latest
 ports:
 - containerPort: 80
 imagePullPolicy: Always

---

kind: Service
apiVersion: v1
metadata:
 name: k8s-demo
 namespace: netcore
spec:
 type: NodePort
 ports:
 - port: 80
 targetPort: 80
 selector:
 name: k8s-demo

```

 
创建name-api项目
------------
 
>#### 项目结构如下

![name-api的项目结构](https://img.tnblog.net/arcimg/hb/b99a4b0c61824eb8a3ab4e2c879e23aa.png "name-api的项目结构")


>#### 实验过程

```flow
st=>start: name-api项目为起始点|current
op=>inputoutput: 请求http://name-api/Values|approved:>https://name-api/Values[blank]
e=>operation: 请求结果|past
st->op->e
```

>#### 内容如下

 
**NameController.cs**
环境变量参考：https://kubernetes.io/zh/docs/concepts/services-networking/service/
 
```csharp
[ApiController]
[Route("[controller]")]
public class NameController : ControllerBase
{
 [HttpGet]
 public ActionResult<string> Get(){
 var host = Environment.GetEnvironmentVariable("NAME_API_SERVICE_HOST");
 if(string.IsNullOrEmpty(host))
 return "empty";
 return host;
 }
}
```

 
**Dockerfile**
 
```bash
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
WORKDIR /src
COPY . name-api/
RUN dotnet restore "name-api/name-api.csproj"
COPY . .
WORKDIR "/src/name-api"
RUN mkdir -p /app/build
RUN mkdir -p /app/publish
RUN dotnet build "name-api.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "name-api.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "name-api.dll"]
```

 
**Deploy.yaml**
 
```bash
apiVersion: apps/v1
kind: Deployment
metadata:
 name: name-api
 namespace: netcore
 labels:
 name: name-api
spec:
 replicas: 2
 selector:
 matchLabels:
 name: name-api
 template:
 metadata:
 labels:
 name: name-api
 spec:
 containers:
 - name: name-api
 image: aidasi/name-api:v1
 ports:
 - containerPort: 80
 imagePullPolicy: Always

---

kind: Service
apiVersion: v1
metadata:
 name: name-api
 namespace: netcore
spec:
 type: NodePort
 ports:
 - port: 80
 targetPort: 80
 selector:
 name: name-api


```

 
发布k8s-name与name-api项目
------------
 

>#### 发布k8s-name项目到 aidasi/k8sdemoapi:v2

 
1. 通过 **Xftp** 上传项目
 
![Xftp](https://img.tnblog.net/arcimg/hb/faae58d1f623449e8fa0048849fe96d0.png "Xftp")


 
2. 到指定目录下生成项目
 
![项目截图](https://img.tnblog.net/arcimg/hb/0413434b4979436c81a6070f23091a48.png "项目截图")

`docker build -t aidasi/k8sdemoapi:v2 .`

![项目build](https://img.tnblog.net/arcimg/hb/ee1bb199ecb74959b12377b8499470be.png "项目build")
 

>#### 发布name-api项目到 aidasi/name-api:v1

 
同理
 

`docker build -t aidasi/name-api:v1 .`
 
![name-api的发布](https://img.tnblog.net/arcimg/hb/7ac8775af5904494bf302074d8f0a8ef.png "name-api的发布")

 
>#### 查看所有镜像结果

 

![查看所有镜像](https://img.tnblog.net/arcimg/hb/ebc08eca6e854b409f1cdf0fa6b30924.png "查看所有镜像")

 
>#### 上传所有镜像

 

`docker push aidasi/name-api:v1`
`docker push aidasi/k8sdemoapi:v2`
 
![](https://img.tnblog.net/arcimg/hb/2b9ec61182f24eb5b02d14d48bdd786f.png)
 

![Hub查看](https://img.tnblog.net/arcimg/hb/97a781eac4f046aeac4fc39ed03ced4e.png "Hub查看")


 
部署项目
------------
 
>#### 部署name-api项目到k8s中

`kubectl apply -f deploy.yaml`
 
![](https://img.tnblog.net/arcimg/hb/dd88bfd959e84ca887c2f2996a8dbcd4.png)

 
>#### 接下来把k8s-demo从v1更新到v2

`kubectl apply -f deploy.yaml`
 
![](https://img.tnblog.net/arcimg/hb/83181d8f35954b5a9ae618c4c2bdb966.png)

>#### 测试一下

`kubectl proxy`

![](https://img.tnblog.net/arcimg/hb/711284140c23466bbc4e758eef6b8275.png)

 
![](https://img.tnblog.net/arcimg/hb/9f214484c75f47cfac2d098d7b068e85.png)

>为什么这里是empty呢？
我当时写代码的时候把环境变量 Name_API_SERVICE_HOST 写错成 Name_API_SERVICE_HOST 了
但我已经在代码中做好修改了
所以大家访问的结果应该是
hello,(Pod ip)

>Hub已经更新了，请大家放心


 
>#### 扩展进入pod指令
`kubectl -n netcore exec -it name-api-d47996547-hcpdj -c name-api -- sh`
 
![](https://img.tnblog.net/arcimg/hb/c852f78adea044e1a3c94e7c40a517ae.png)

 
靓仔，给个关注嘛！！！

欢迎加群讨论技术，1群：677373950(满了，可以加，但通过不了)，2群：656732739

👈{{preArticle.title}}

👉{{nextArticle.title}}

评价

尘叶心繁

这一世以无限游戏为使命！

博主信息

排名

文章

粉丝

文章类别

.net后台框架 185篇

linux 18篇

linux中cve 1篇

windows中cve 0篇

资源分享 10篇

Win32 3篇

前端 28篇

传说中的c 5篇

Xamarin 9篇

docker 15篇

容器编排 101篇

grpc 4篇

Go 15篇

yaml模板 1篇

理论 2篇

.netcore 通过Flurl验证k8s内部访问与获取环境变量

{{titleitem}} {{titleitem}}

{{titleitem}} {{titleitem}}