新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件
This commit is contained in:
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FROM mcr.microsoft.com/dotnet/core/sdk:3.1.301-alpine AS builder
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WORKDIR /src
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COPY src/TimecheckController.csproj .
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RUN dotnet restore
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COPY src/ .
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RUN dotnet publish -c Release -o /out TimecheckController.csproj
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# app image
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FROM mcr.microsoft.com/dotnet/core/runtime:3.1.5-alpine
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WORKDIR /app
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ENTRYPOINT ["dotnet", "TimecheckController.dll"]
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COPY --from=builder /out/ .
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## Credits
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https://radu-matei.com/blog/kubernetes-controller-csharp/
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https://github.com/engineerd/kubecontroller-csharp
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https://fearofoblivion.com/intro-to-kubernetes-custom-resource-definitions-or-crds
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using k8s;
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using k8s.Models;
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namespace TimecheckController.CustomResources
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{
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public class Timecheck : KubernetesObject
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{
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public V1ObjectMeta Metadata { get; set; }
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public TimecheckSpec Spec { get; set; }
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public class TimecheckSpec
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{
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public string Environment { get; set; }
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public int Interval { get; set; }
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}
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public struct Definition
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{
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public const string Group = "ch20.kiamol.net";
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public const string Version= "v1";
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public const string Plural = "timechecks";
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}
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}
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}
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using k8s;
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using k8s.Models;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using TimecheckController.CustomResources;
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namespace TimecheckController.Handlers
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{
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public class TimecheckAddedHandler
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{
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private readonly Kubernetes _kubernetes;
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public TimecheckAddedHandler(Kubernetes kubernetes)
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{
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_kubernetes = kubernetes;
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}
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public async Task HandleAsync(Timecheck timecheck)
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{
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await EnsureDeploymentAsync(timecheck);
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}
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private async Task EnsureDeploymentAsync(Timecheck timecheck)
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{
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var name = timecheck.Metadata.Name;
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var deployments = await _kubernetes.ListNamespacedDeploymentAsync(
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namespaceParameter: Program.NamespaceName,
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fieldSelector: $"metadata.name={name}");
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if (!deployments.Items.Any())
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{
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var deployment = new V1Deployment
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{
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Metadata = new V1ObjectMeta
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{
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Name = name,
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Labels = new Dictionary<string, string>()
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{
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{ "kiamol", "ch20" },
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}
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},
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Spec = new V1DeploymentSpec
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{
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Selector = new V1LabelSelector
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{
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MatchLabels = new Dictionary<string, string>()
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{
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{ "app", "timecheck"},
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{ "instance", name }
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}
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},
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Template = new V1PodTemplateSpec
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{
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Metadata = new V1ObjectMeta
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{
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Labels = new Dictionary<string, string>()
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{
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{ "app", "timecheck"},
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{ "instance", name }
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}
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},
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Spec = new V1PodSpec
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{
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AutomountServiceAccountToken = false,
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Containers = new List<V1Container>
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{
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new V1Container
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{
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Name = "tc",
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Image = "kiamol/ch07-timecheck",
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Env = new List<V1EnvVar>
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{
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new V1EnvVar
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{
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Name = "Application__Environment",
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Value = timecheck.Spec.Environment
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},
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new V1EnvVar
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{
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Name = "Timer__IntervalSeconds",
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Value = timecheck.Spec.Interval.ToString()
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}
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},
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VolumeMounts = new List<V1VolumeMount>
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{
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new V1VolumeMount
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{
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Name= "logs",
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MountPath = "/logs"
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}
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}
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},
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new V1Container
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{
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Name = "logger",
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Image = "kiamol/ch03-sleep",
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Command = new List<string>
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{
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"sh", "-c", "tail -f /logs-ro/timecheck.log"
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},
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VolumeMounts = new List<V1VolumeMount>
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{
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new V1VolumeMount
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{
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Name= "logs",
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MountPath = "/logs-ro",
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ReadOnlyProperty = true
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}
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}
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}
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},
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Volumes = new List<V1Volume>
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{
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new V1Volume
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{
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Name = "logs",
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EmptyDir = new V1EmptyDirVolumeSource()
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}
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}
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}
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}
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}
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};
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await _kubernetes.CreateNamespacedDeploymentAsync(deployment, Program.NamespaceName);
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Console.WriteLine($"** Created Deployment: {name}, in namespace: {Program.NamespaceName}");
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}
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else
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{
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Console.WriteLine($"** Deployment exists: {name}, in namespace: {Program.NamespaceName}");
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}
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}
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}
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}
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using k8s;
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using System;
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using System.Linq;
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using System.Threading.Tasks;
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using TimecheckController.CustomResources;
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namespace TimecheckController.Handlers
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{
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class TimecheckDeletedHandler
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{
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private readonly Kubernetes _kubernetes;
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public TimecheckDeletedHandler(Kubernetes kubernetes)
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{
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_kubernetes = kubernetes;
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}
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public async Task HandleAsync(Timecheck timecheck)
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{
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await DeleteDeploymentAsync(timecheck);
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}
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private async Task DeleteDeploymentAsync(Timecheck timecheck)
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{
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var name = timecheck.Metadata.Name;
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var deployments = await _kubernetes.ListNamespacedDeploymentAsync(
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namespaceParameter: Program.NamespaceName,
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fieldSelector: $"metadata.name={name}");
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if (deployments.Items.Any())
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{
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await _kubernetes.DeleteNamespacedDeploymentAsync(name, Program.NamespaceName);
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Console.WriteLine($"** Deleted Deployment: {name}, in namespace: {Program.NamespaceName}");
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}
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else
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{
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Console.WriteLine($"** No Deployment to delete: {name}, in namespace: {Program.NamespaceName}");
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}
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}
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}
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}
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using k8s;
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using TimecheckController.CustomResources;
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using TimecheckController.Handlers;
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namespace TimecheckController
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{
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class Program
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{
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private static ManualResetEvent _ResetEvent = new ManualResetEvent(false);
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private static Kubernetes _Client;
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static async Task Main(string[] args)
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{
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KubernetesClientConfiguration config;
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if (KubernetesClientConfiguration.IsInCluster())
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{
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config = KubernetesClientConfiguration.InClusterConfig();
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}
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else
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{
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config = new KubernetesClientConfiguration { Host = "http://localhost:8001" };
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}
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_Client = new Kubernetes(config);
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var result = await _Client.ListNamespacedCustomObjectWithHttpMessagesAsync(
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group: Timecheck.Definition.Group,
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version: Timecheck.Definition.Version,
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plural: Timecheck.Definition.Plural,
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namespaceParameter: "default",
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watch: true);
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using (result.Watch<Timecheck, object>(async (type, item) => await Handle(type, item)))
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{
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Console.WriteLine("* Watching for custom object events");
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_ResetEvent.WaitOne();
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}
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}
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public static async Task Handle(WatchEventType type, Timecheck timecheck)
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{
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switch (type)
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{
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case WatchEventType.Added:
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await new TimecheckAddedHandler(_Client).HandleAsync(timecheck);
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Console.WriteLine($"* Handled event: {type}, for Timecheck: {timecheck.Metadata.Name}");
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break;
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case WatchEventType.Deleted:
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await new TimecheckDeletedHandler(_Client).HandleAsync(timecheck);
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Console.WriteLine($"* Handled event: {type}, for Timecheck: {timecheck.Metadata.Name}");
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break;
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default:
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Console.WriteLine($"* Ignored event: {type}, for Timecheck: {timecheck.Metadata.Name}");
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break;
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}
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}
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// TODO - move to config:
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public const string NamespaceName = "default";
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}
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}
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@@ -0,0 +1,12 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>netcoreapp3.1</TargetFramework>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="KubernetesClient" Version="2.0.26" />
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</ItemGroup>
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</Project>
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@@ -0,0 +1,25 @@
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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 16
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VisualStudioVersion = 16.0.30309.148
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TimecheckController", "TimecheckController.csproj", "{D92E46DD-C089-48E5-8B94-371EC9A27704}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{D92E46DD-C089-48E5-8B94-371EC9A27704}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{D92E46DD-C089-48E5-8B94-371EC9A27704}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{D92E46DD-C089-48E5-8B94-371EC9A27704}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{D92E46DD-C089-48E5-8B94-371EC9A27704}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {BB8F2AD8-5410-4F5E-AFC6-D8AA6BCDAAC4}
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EndGlobalSection
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EndGlobal
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