为Pod挂载独立公网EIP

自动分配EIP

指定EIP实例

您可以通过指定EIP实例ID的方式绑定已有的EIP。Pod Annotation不会对EIP实例配置进行修改，仅将EIP绑定到指定的Pod。

在ack-extend-network-controller中启用

通过Annotation为指定Pod创建和关联EIP

通过指定Pod中的Annotation可以创建或关联EIP到此Pod中。关于Annotation的详细信息，请参见下文常见问题。

1. 创建应用，并为指定Pod创建和关联EIP。

   无状态应用

   使用如下示例创建一个Deployment控制器，为每个Pod自动分配一个EIP实例，实例带宽为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创建成功后，执行以下命令，访问Pod同名的资源podeips.alibabacloud.com，跟踪分配的EIP信息。

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

   预期输出：

   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

   有状态应用

   使用如下示例创建一个StatefulSet资源，创建两个Pod，并为每个Pod自动分配一个EIP实例，并设置回收策略为Pod删除10分钟后删除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创建成功后，执行以下命令访问Pod同名的资源podeips.alibabacloud.com，跟踪分配的EIP信息。

   kubectl get podeip -n <namespace> -o yaml

   预期输出：

   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: ""

   此有状态应用的Pod删除后，PodEIP CR会保留10分钟后再删除，在此期间创建的同名称Pod，将继续使用相应的EIP。

2. 验证配置。

   当Pod变成Running状态之后，可以观察部署后的Pod中Annotations k8s.aliyun.com/allocated-eipAddress的值来查看它分配到的关联EIP地址，通过该EIP即可访问到Pod。

   

在Terway中启用

为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
...

为Pod配置init Container

为Pod配置init Container，在init Container中检查EIP是否已经分配成功。您可以参考以下示例配置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