scubakiz/nginxcolordemo

镜像概述

本镜像基于 https://hub.docker.com/r/nginxinc/ingress-demo%EF%BC%8C%E5%9C%A8%E5%B1%95%E7%A4%BA%E5%AE%B9%E5%99%A8%E4%B8%BB%E6%9C%BA%E5%90%8D/IP%E7%9A%84%E5%9F%BA%E7%A1%80%E4%B8%8A%E5%A2%9E%E5%8A%A0%E9%A2%9C%E8%89%B2%E5%92%8C%E5%9B%BE%E5%83%8F%E5%8F%98%E4%BD%93%EF%BC%8C%E9%A1%B5%E9%9D%A2%E6%AF%8F3%E7%A7%92%E8%87%AA%E5%8A%A8%E5%88%B7%E6%96%B0%EF%BC%8C%E4%BE%BF%E4%BA%8E%E5%AE%9E%E6%97%B6%E8%A7%82%E5%AF%9F%E9%83%A8%E7%BD%B2%E5%8F%98%E5%8C%96%E3%80%82

核心功能

1. 展示容器相关信息（节点IP、名称、命名空间等）
2. 支持不同颜色标签的镜像变体（如red、green）
3. 通过Kubernetes Downward API注入Pod信息到环境变量
4. 页面自动刷新，适配培训场景的可视化需求

使用场景

适用于Kubernetes培训课程，用于可视化演示以下场景：

• 部署滚动更新
• 部署回滚操作
• ReplicaSets管理
• 金丝雀部署验证

配置说明

通过Kubernetes Downward API传递Pod信息到容器环境变量，示例部署配置如下：

yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ngcolor
spec:
  replicas: 5
  selector:
    matchLabels:
       target: ngcolor
  template:
    metadata:
      name: ngcolor
      labels:
        target: ngcolor
    spec:
      nodeSelector:
        kubernetes.io/os: linux
      containers:
      - name: nginxcolordemo
        image: localhost:7000/nginxcolordemo:red
        ports:
        - containerPort: 80
          protocol: TCP
        # 传递主机IP以便在页面显示
        env:
        - name: NODE_IP
          valueFrom:
            fieldRef:
              fieldPath: status.hostIP
        - name: NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        - name: POD_SERVICE_ACCOUNT
          valueFrom:
            fieldRef:
              fieldPath: spec.serviceAccountName 
        - name: POD_CPU_REQUEST
          valueFrom:
            resourceFieldRef:
              containerName: nginxcolordemo
              resource: requests.cpu
        - name: POD_CPU_LIMIT
          valueFrom:
            resourceFieldRef:
              containerName: nginxcolordemo
              resource: limits.cpu
        - name: POD_MEM_REQUEST
          valueFrom:
            resourceFieldRef:
              containerName: nginxcolordemo
              resource: requests.memory
        - name: POD_MEM_LIMIT
          valueFrom:
            resourceFieldRef:
              containerName: nginxcolordemo
              resource: limits.memory 
        imagePullPolicy: Always
     
---          
apiVersion: v1
kind: Service
metadata:
  name: ngcolor
spec:
  ports:
    - port: 8080
      targetPort: 80
  selector:
    target: ngcolor
  type: LoadBalancer

部署操作示例

更新部署（更换颜色镜像）

bash
kubectl set image deployment.v1.apps/ngcolor nginxcolordemo=scubakiz/nginxcolordemo:green --record

查看滚动更新状态

bash
kubectl rollout status deployment.v1.apps/ngcolor -w

查看ReplicaSets

bash
kubectl get rs

回滚部署

bash
kubectl rollout undo deployment.v1.apps/ngcolor 
kubectl rollout status deployment.v1.apps/ngcolor -w