K8s 內的網路檢測

因為在 Hyper-V 內建立一個 Ubuntu 20.04 VM 然後起一個 K8s Cluster 卻發現在 K8s 內的服務連不上 VM 內的服務, 以下是將檢測 K8s 網路的相關語法紀錄下來.

• 定義 pod 內容 k8s-chk.yml

  apiVersion: apps/v1
  kind: Deployment
  metadata:
      name: busybox
      namespace: default
  spec:
    replicas: 1
    selector:
      matchLabels:
        app: busybox
    template:
      metadata:
        labels:
          app: busybox
      spec:
        containers:
        - name: busybox
          image: progrium/busybox
          command:
            - sleep
            - "3600"
          imagePullPolicy: IfNotPresent

• 啟動檢測 pod

  kubectl apply -f k8s-chk.yml

  localadmin@iiidevops1:~/test$ kubectl apply -f k8s-chk.yml
  deployment.apps/busybox created

• 取得 pod name

  kubectl get pod | grep busybox

  localadmin@iiidevops1:~/test$ kubectl get pod | grep busybox
  busybox-5d5bd64f66-zlvls                1/1     Running   0          2m29s

• 安裝 curl

  kubectl exec -it busybox-5d5bd64f66-zlvls -- opkg-install curl

• 進行目標網址檢測

  kubectl exec -it busybox-5d5bd64f66-zlvls -- ping -c 5 172.16.0.171
  kubectl exec -it busybox-5d5bd64f66-zlvls -- traceroute 172.16.0.171
  kubectl exec -it busybox-5d5bd64f66-zlvls -- curl -k https://172.16.0.171:5443/

kubectl delete deploy busybox

localadmin@devops1:~/test$ kubectl delete deploy busybox
deployment.apps "busybox" deleted

• https://stackoverflow.com/questions/62847331/is-there-possible-to-install-curl-into-busybox-in-kubernetes-pod