• Good example multi-container pod definition file: ``` apiVersion: v1 kind: Pod metadata: name: yellow spec: containers:
    • name: lemon image: busybox command:
      • sleep
      • “1000”
    • name: gold image: redis ```
  • An example command to inspect a container’s logs within a pod: 
    kubectl -n elastic-stack logs kibana
  • Go through this documentation to add a side car container: https://kubernetes.io/docs/tasks/access-application-cluster/communicate-containers-same-pod-shared-volume/
  • A good manifestation file surrounding the elastic-stack
  • Good video on the Kubernetes Stack and the Kibana Dashboard.
  • To check the containers that running under a pod, run kubectl describe pod <pod_name>
  • Example container create: 
    kubectl run yellow --image=busybox --dry-run=client -o yaml
  • Then edit the file that is generated. ``` apiVersion: v1 kind: Pod metadata: name: yellow spec: containers:
    • name: lemon image: busybox command:
      • sleep
      • “1000”
    • name: gold image: redis ```
  • Can also do the sleep command like the above using the following: ``` apiVersion: v1 kind: Pod metadata: name: yellow spec: containers:
    • name: lemon image: busybox command: [“sleep”, “1000”]
    • name: gold image: redis ```
  • Then create the pod with kubectl create -f yellow.yaml.
  • Firstly, explore the namespace kubectl get pods -n elastic-stack
  • Check logs with kubectl logs pod <app_name> -n <namespace>
    • These logs are also stored in the pod as well: 
      kubectl -n <namespace> exec -it <pod_name> -- cat <log_location_of_container>
  • How to edit a pod for sidecar: 
    kubectl edit pod <pod_name>
  • Then add an image under spec: –> containers: ``` spec: containers:
    • image: kodekloud/filebeat-configured name: sidecar volumeMounts:
      • mountPath: /var/log/event-simulator/ name: log-volume ```
  • Save and quit. Take the temp file that is created and then run the following to recreate the pod with the additional container added: 
    kubectl replace --force -f /tmp/kubectl-edit-234235234.yaml`

Updated: