Container Service for Kubernetes：為Pod掛載獨立公網EIP

自動分配EIP

指定EIP執行個體

您可以通過指定EIP執行個體ID的方式綁定已有的EIP。Pod Annotation不會對EIP執行個體配置進行修改，僅將EIP綁定到指定的Pod。

在ack-extend-network-controller中啟用

通過Annotation為指定Pod建立和關聯EIP

通過指定Pod中的Annotation可以建立或關聯EIP到此Pod中。關於Annotation的詳細資料，請參見下文常見問題。

1. 建立應用，並為指定Pod建立和關聯EIP。

   無狀態應用

   使用如下樣本建立一個Deployment控制器，為每個Pod自動分配一個EIP執行個體，執行個體頻寬為5 Mbps。

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: example
     labels:
       app: example
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: example
     template:
       metadata:
         labels:
           app: example
         annotations:
           k8s.aliyun.com/pod-with-eip: "true"
           k8s.aliyun.com/eip-bandwidth: "5"
       spec:
         readinessGates:
         - conditionType: "k8s.aliyun.com/eip"
         containers:
         - name: example
           image: nginx

   Pod建立成功後，執行以下命令，訪問Pod同名的資源podeips.alibabacloud.com，跟蹤分配的EIP資訊。

   kubectl get podeip -n <namespace> <podname>  -o yaml

   預期輸出：

   apiVersion: alibabacloud.com/v1beta1
   kind: PodEIP
   metadata:
     creationTimestamp: "2023-12-15T04:25:37Z"
     finalizers:
     - podeip-controller.alibabacloud.com/finalizer
     generation: 1
     name: example-xxx
     namespace: default
     resourceVersion: "222800"
     uid: 43xxx-f1xx-4xxx-b3xx-969faxxx
   spec:
     allocationID: eip-2ze2qe8zsxxx
     allocationType:
       releaseStrategy: Follow
       type: Auto
   status:
     eipAddress: 39.102.XX.XX
     internetChargeType: PayByTraffic
     isp: BGP
     networkInterfaceID: eni-2zeagv8f3xxxx
     podLastSeen: "2023-12-15T05:18:47Z"
     privateIPAddress: 192.168.XX.XX
     resourceGroupID: rg-acfmwxxxxxsq
     status: InUse

   有狀態應用

   使用如下樣本建立一個StatefulSet資源，建立兩個Pod，並為每個Pod自動分配一個EIP執行個體，並設定回收策略為Pod刪除10分鐘後刪除PodEIP。

   apiVersion: apps/v1
   kind: StatefulSet
   metadata:
     name: example
     labels:
       app: example
   spec:
     serviceName: "example"
     replicas: 2
     selector:
       matchLabels:
         app: example
     template:
       metadata:
         labels:
           app: example
         annotations:
           k8s.aliyun.com/pod-with-eip: "true"
           k8s.aliyun.com/pod-eip-release-strategy: "10m"
       spec:
         containers:
         - name: example
           image: nginx

   Pod建立成功後，執行以下命令訪問Pod同名的資源podeips.alibabacloud.com，跟蹤分配的EIP資訊。

   kubectl get podeip -n <namespace> -o yaml

   預期輸出：

   apiVersion: v1
   items:
   - apiVersion: alibabacloud.com/v1beta1
     kind: PodEIP
     metadata:
       creationTimestamp: "2023-12-15T03:28:01Z"
       finalizers
       - podeip-controller.alibabacloud.com/finalizer
       generation: 1
       name: example-0
       namespace: default
       resourceVersion: "227221"
       uid: 79954xx-17xx-4dxx-b7xx-15b84xxx
     spec:
       allocationID: eip-2ze08metxxx
       allocationType:
         releaseAfter: 10m
         releaseStrategy: TTL
         type: Auto
     status:
       eipAddress: 39.105.XX.XX
       internetChargeType: PayByTraffic
       isp: BGP
       networkInterfaceID: eni-2ze4tkg4xxx
       podLastSeen: "2023-12-15T05:31:34Z"
       privateIPAddress: 192.168.XX.XX
       resourceGroupID: rg-acfmwxxx
       status: InUse
   - apiVersion: alibabacloud.com/v1beta1
     kind: PodEIP
     metadata:
       creationTimestamp: "2023-12-15T03:28:03Z"
       finalizers:
       - podeip-controller.alibabacloud.com/finalizer
       generation: 1
       name: example-1
       namespace: default
       resourceVersion: "227222"
       uid: 1339xxxe7-97xx-46xx-9bxx-537690xxx
     spec:
       allocationID: eip-2zetwhffqxxx
       allocationType:
         releaseAfter: 10m
         releaseStrategy: TTL
         type: Auto
     status:
       eipAddress: 39.105.XX.XX
       internetChargeType: PayByTraffic
       isp: BGP
       networkInterfaceID: eni-2zeagv8f3wxxx
       podLastSeen: "2023-12-15T05:31:34Z"
       privateIPAddress: 192.168.XX.XX
       resourceGroupID: rg-acfmwqnwxxx
       status: InUse
   - apiVersion: alibabacloud.com/v1beta1
     kind: PodEIP
     metadata:
       creationTimestamp: "2023-12-15T04:25:37Z"
       finalizers:
       - podeip-controller.alibabacloud.com/finalizer
       generation: 1
       name: example-5bxxx-9xx
       namespace: default
       resourceVersion: "227220"
       uid: 43cdfxxx-f1xx-42xx-b3xx-969fxxx
     spec:
       allocationID: eip-2ze2qe8zsmnxxx
       allocationType:
         releaseStrategy: Follow
         type: Auto
     status:
       eipAddress: 39.102.XX.XX
       internetChargeType: PayByTraffic
       isp: BGP
       networkInterfaceID: eni-2zeagv8f3wxxx
       podLastSeen: "2023-12-15T05:31:34Z"
       privateIPAddress: 192.168.XX.XX
       publicIpAddressPoolID: pippool-2ze498cxxx
       resourceGroupID: rg-acfmwqnxxx
       status: InUse
   kind: List
   metadata:
     resourceVersion: ""

   此有狀態應用的Pod刪除後，PodEIP CR會保留10分鐘後再刪除，在此期間建立的同名稱Pod，將繼續使用相應的EIP。

2. 驗證配置。

   當Pod變成Running狀態之後，可以觀察部署後的Pod中Annotations k8s.aliyun.com/allocated-eipAddress的值來查看它分配到的關聯EIP地址，通過該EIP即可訪問到Pod。

   

在Terway中啟用

為Pod配置Readiness gates

kind: Pod
...
spec:
  readinessGates:
  - conditionType: "k8s.aliyun.com/eip"
status:
  conditions:
  - lastProbeTime: "2022-12-12T03:45:48Z"
    lastTransitionTime: "2022-12-12T03:45:48Z"
    reason: Associate eip succeed
    status: "True"
    type: k8s.aliyun.com/eip
...

為Pod配置init Container

為Pod配置init Container，在init Container中檢查EIP是否已經分配成功。您可以參考以下樣本配置init Container。

apiVersion: v1
kind: Pod
metadata:
  name: example
  annotations:
    k8s.aliyun.com/pod-with-eip: "true"
spec:
  containers:
  - name: example
    image: busybox:1.28
    command: ['sh', '-c', 'echo The app is running! && sleep 3600']
  initContainers:
  - name: init
    image: busybox:1.28
    command: ['timeout', '-t' ,'60', 'sh','-c', "until grep -E '^k8s.aliyun.com\\/allocated-eipAddress=\\S?[0-9]+\\S?' /etc/podinfo/annotations; do echo waiting for annotations; sleep 2; done"]
    volumeMounts:
      - name: podinfo
        mountPath: /etc/podinfo
  volumes:
    - name: podinfo
      downwardAPI:
        items:
          - path: "labels"
            fieldRef:
              fieldPath: metadata.labels
          - path: "annotations"
            fieldRef:
              fieldPath: metadata.annotations