微服务实践k8s&dapr开发部署实验（1）服务调用
前置条件
- 安装docker与dapr: 手把手教你学Dapr - 3. 使用Dapr运行第一个.Net程序
- 安装k8s
dapr 自托管模式运行
新建一个webapi无权限项目
launchSettings.json中applicationUrl端口改成5001，如下：
"applicationUrl": "http://localhost:5001"
//WeatherForecastController.cs更改如下
using Microsoft.AspNetCore.Mvc;
namespace backend.Controllers
{
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
private static readonly string[] Summaries = new[]
{
"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
};
private readonly ILogger<WeatherForecastController> _logger;
public WeatherForecastController(ILogger<WeatherForecastController> logger)
{
_logger = logger;
}
[HttpGet(Name = "GetWeatherForecast")]
public IEnumerable<WeatherForecast> Get()
{
return Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
TemperatureC = Random.Shared.Next(-20, 55),
Summary = Summaries[Random.Shared.Next(Summaries.Length)]
})
.ToArray();
}
[HttpPost(Name = "Hello")]
public object SayHello()
{
return new { message = "Hello" }; //这里返回必须是json对象，如果为字符串，则在daprClient.InvokeMethodAsync调用时会出错
}
}
}
到backend目录运行运行下面命令：
dapr run --app-id backend --app-port 5001 dotnet run
然后运行：
dapr invoke --app-id backend --method WeatherForecast
dapr invoke --app-id backend --method WeatherForecast --verb GET
显示下图表示运行成功
dapr服务调用
新建一个名为front的weiapi无权限项目
launchSettings.json中applicationUrl端口改成5002，如下：
"applicationUrl": "http://localhost:5002"
添加nuget包：Dapr.Client
修改WeatherForecastController.cs如下：
using Dapr.Client;
using Microsoft.AspNetCore.Mvc;
namespace front.Controllers
{
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
[HttpPost(Name = "Hello")]
public async Task<string> HelloAsync()
{
var appId = "backend";
var methodName = "WeatherForecast";
using (var daprClient = new DaprClientBuilder().Build())
{
try
{
var result = await daprClient.InvokeMethodAsync<object>(HttpMethod.Post, appId, methodName);
Console.WriteLine(result);
return result.ToString();
}
catch (Exception ex)
{
Console.WriteLine($"An exception occurred while invoking method: '{methodName}' on app-id: '{appId}'");
Console.WriteLine(ex.ToString());
}
}
return "Error!";
}
}
}
访问http://http://localhost:5002/swagger/页面运行如下就成功了
k8s&dapr模式运行
Dapr uninstall --all
dapr init -k
新增docker支持
添加backend的k8s配置文件dapr-backend.yaml
kind: Deployment
apiVersion: apps/v1
metadata:
name: dapr-deploy-backend
labels:
service: backend
spec:
replicas: 2
selector:
matchLabels:
service: backend
template:
metadata:
labels:
service: backend
annotations:
dapr.io/enabled: "true"
dapr.io/app-id: "backend" #这里要注意app-id要与front调用的名称要一致
dapr.io/app-port: "8080"
#dapr.io/config: "dapr-config"
spec:
containers:
- name: daprbackend
image: daprbackend
imagePullPolicy: Never
ports:
- name: http
containerPort: 8080
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: daprbackend
labels:
service: backend
spec:
type: NodePort
ports:
- port: 80
targetPort: 8080
nodePort: 30003
protocol: TCP
name: http
- port: 50001
targetPort: 50001
nodePort: 30042
protocol: TCP
name: dapr-grpc
selector:
service: backend
添加backend的k8s配置文件dapr-backend.yaml
kind: Deployment
apiVersion: apps/v1
metadata:
name: dapr-deploy-front
labels:
service: front
spec:
replicas: 1
selector:
matchLabels:
service: front
template:
metadata:
labels:
service: front
annotations:
dapr.io/enabled: "true"
dapr.io/app-id: "front"
dapr.io/app-port: "8080"
#dapr.io/config: "dapr-config"
spec:
containers:
- name: daprfrontend
image: daprfrontend
imagePullPolicy: Never
ports:
- name: http
containerPort: 8080
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: daprfrontend
labels:
service: front
spec:
type: NodePort
ports:
- port: 80
targetPort: 8080
nodePort: 30002
protocol: TCP
name: http
- port: 50001
targetPort: 50001
nodePort: 30041
protocol: TCP
name: dapr-grpc
selector:
service: front
启动批处理文件start-all.bat
docker build -t daprbackend -f backend/Dockerfile .
docker build -t daprfrontend -f front/Dockerfile .
Dapr uninstall --all
dapr init -k
kubectl apply -f k8s/dapr-backend.yaml
kubectl apply -f k8s/dapr-front.yaml
pause
停止批处理文件stop-all.bat
kubectl delete -f ./k8s/dapr-front.yaml
kubectl delete -f ./k8s/dapr-backend.yaml
Dapr uninstall --all
pause
运行成功验证
访问http://localhost:30002/swagger/index.html
显示如下说明已经成功
项目源码下载
常用命令
dapr uninstall
Dapr uninstall --all
dapr init
dapr init -k
dapr run --app-id myapp --dapr-http-port 3500 --dapr-grpc-port 50001 -- dotnet run #运行.net项目
dapr run --app-id backend --app-port 5001 dotnet run
dapr invoke --app-id backend --method WeatherForecast #调用接口
dapr invoke --app-id backend --method WeatherForecast --verb GET
