Kubernetes init containers (initContainers)

• https://kubernetes.io/docs/concepts/workloads/pods/init-containers/#init-containers-in-use

apiVersion: v1
kind: Pod
metadata:
 name: myapp-pod
 labels:
   app: myapp
spec:
 containers:
 - name: myapp-container
   image: busybox:1.28
   command: ['sh', '-c', 'echo The app is running! && sleep 3600']
 initContainers:
 - name: init-myservice
   image: busybox:1.28
   command: ['sh', '-c', "until nslookup myservice.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo  waiting for myservice; sleep 2; done"]
 - name: init-mydb
   image: busybox:1.28
   command: ['sh', '-c', "until nslookup mydb.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).svc.cluster.local; do echo waiting for mydb; sleep 2; done"]

Examples

 initContainers:
    - name: myname
      image: public.ecr.aws/aws-cli/aws-cli
      command: ["aws", "s3", "sync", "s3://mybucket", "/yourdir"]
      volumeMounts:
        - name: yourdir
          mountPath: "/yourdir"

Related

• kubectl get pod your-pod-name --template '{{.status.initContainerStatuses}}'
• init:, Init:0/1
• args:
• Elasticsearch: sysctl -w vm.max_map_count=262144
• Redis_values.yml
• aws-node
• restartPolicy

See also

• Kubernetes init containers: kubectl get pods, Init: (Init:ErrImagePull, Init:CrashLoopBackOff, Init:ImagePullBackOff), initContainers:
• Sidecar, Kubernetes Sidecar Containers, Sidecar (Kubernetes), Sidecar container
• kind: Pod: spec.containers, spec.initContainers, spec.volumes, spec.securityContext