CKAD 2 | Multicontainer Pods

Logging

  • Check pod logs

kubectl logs podName

  • Check container logs in a pod

kubectl logs podName containerName

Monitoring

  • Check node resource

kubectl top nodes

  • Check pod resource

kubectl top pods

Probes

  • Readiness Probe

By leveraging readiness probes, Kubernetes can ensure that only healthy and fully operational containers receive traffic from services or other pods, preventing requests from being sent to containers that are still starting up or experiencing issues. Here’s a http readiness probe example,

spec -> containers ->

- readinessProbe:
    httpGet:
      path: /path
      port: portNum
    periodSeconds: periodValue
    initialDelaySeconds: delayValue

  • Liveness Probe

The liveness probe focuses on the ongoing health of a container, automatically restarting it if needed. Here’s a http liveness probe example,

spec -> containers ->

- livenessProbe:
    httpGet:
      path: /path
      port: portNum
    periodSeconds: periodValue
    initialDelaySeconds: delayValue

initContainers

Init containers are specialized containers that run before app containers in a Pod.

  • Configuration

spec -> initContainers -> 

- name: initContainerName
  image: initContainerImage
# The rest is similar to a normal container