Completek8s Classroomnotes 05/Aug/2023

Restrictions for Kubernetes Pods in terms of Resources

• Refer Here for Resource Management in K8s for Pods and containers
• Lets create a pod spec which specifies
  • minimum 100 MiB RAM to Jenkins container
  • maximum 256 MiB RAM to Jenkins container
  • Refer Here for the spec
    
    
• Lets create jenkins pod with same restrictions as above plus maximum cpu of 0.05
  • Refer Here for the changes
• Pod specification is all about containers, but in reality we might need to control Pods not containers, We have other kuberenetes resources such as
  • Replica Sets
  • Deployments
  • Daemonsets
  • Statefulsets etc
  • Job
  • CronJob
• Pods in k8s have
  • containers
  • ephemeralContainers
  • initContainers
• Experiment: Refer Here to run a disaster.yaml file which contains 3 types of containers (note: this is not the way it is supposed to be)
• Pod never starts:

---
apiVersion: v1
kind: Pod
metadata:
  name: actvity1
spec:
  containers:
    - name: jenkins
      image: jenkins/jenkins:lts-jdk11
  initContainers:
    - name: jenkinsi
      image: jenkins/jenkins:lts-jdk11

* Refer Here for the changes
* When init container completes then containers start

* Refer Here for the changes done

* Refer Here for init containers

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