add-sidecar.yaml

apiVersion: v1
kind: Pod
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","kind":"Pod","metadata":{"annotations":{},"name":"counter","namespace":"default"},"spec":{"containers":[{"args":["/bin/sh","-c","i=0; while true; do\n  echo \"$(date) INFO $i\" \u003e\u003e /var/log/legacy-app.log;\n  i=$((i+1));\n  sleep 1;\ndone      \n"],"image":"busybox:1.28","name":"count","volumeMounts":[{"mountPath":"/var/log","name":"varlog"}]}],"volumes":[{"emptyDir":{},"name":"varlog"}]}}
  creationTimestamp: "2023-10-10T12:07:21Z"
  name: counter
  namespace: default
  resourceVersion: "25549830"
  uid: a27088ac-1fef-46b4-a12f-7618f9ddaceb
spec:
  containers:
  - args:
    - /bin/sh
    - -c
    - "i=0; while true; do\n  echo \"$(date) INFO $i\" >> /var/log/legacy-app.log;\n
      \ i=$((i+1));\n  sleep 1;\ndone      \n"
    image: busybox:1.28
    imagePullPolicy: IfNotPresent
    name: count
    resources: {}
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
    - mountPath: /var/log
      name: varlog
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: kube-api-access-wwbz9
      readOnly: true
  - name: sidecar
    image: busybox
    args: [/bin/sh, -c, 'tail -n+1 -f /var/log/legacy-app.log']
    volumeMounts:
    - name: varlog
      mountPath: /var/log
  dnsPolicy: ClusterFirst
  enableServiceLinks: true
  nodeName: node-1
  preemptionPolicy: PreemptLowerPriority
  priority: 0
  restartPolicy: Always
  schedulerName: default-scheduler
  securityContext: {}
  serviceAccount: default
  serviceAccountName: default
  terminationGracePeriodSeconds: 30
  tolerations:
  - effect: NoExecute
    key: node.kubernetes.io/not-ready
    operator: Exists
    tolerationSeconds: 300
  - effect: NoExecute
    key: node.kubernetes.io/unreachable
    operator: Exists
    tolerationSeconds: 300
  volumes:
  - emptyDir: {}
    name: varlog
  - name: kube-api-access-wwbz9
    projected:
      defaultMode: 420
      sources:
      - serviceAccountToken:
          expirationSeconds: 3607
          path: token
      - configMap:
          items:
          - key: ca.crt
            path: ca.crt
          name: kube-root-ca.crt
      - downwardAPI:
          items:
          - fieldRef:
              apiVersion: v1
              fieldPath: metadata.namespace
            path: namespace