kubernetes #workloads

Here is my raw notes when I was learning about kubernetes workloads. Basic kubernetes knowledge

deployment

• control what to deploy
• stateless
• scaling
• rolling updates and rollback

replicaset

• ensure number of pods

statefulset

• stateful for DB
• stateful network identities
• persistent storage per pod
• creation and deletion order

daemonset

• background service on every node
• for polling, logging, monitoring, network management, security agent
• do not use if
  • service needed on some nodes then use deployment with labels
  • scalability needed

job

• batch jobs
• runs till completion
• can retry

restartPolicy: never 
backoffLimit: 3 //retries

cronjob

• batch jobs on schedule
• concurrency policy
• eg running scripts, cleanups, log rotation

* * * * * command
min , hour, day of month, month , day of week , command to run

0 0 **** every day midnight 
0 9 ** 1 every monday 9am