Day 02 - Sarmila

Namespaces

• Namespace is a logical separation of resources within the cluster
• Namespaces was introduced to overcome 2 problems, 1.To avoid problems while using the shared resources by diff applications 2.To restrict access over resources
• Pods will come under namespaces
• When pods are under a namespace ,namespace will be true

• When pods are under a worker node, namespace will be false

• Any namespace will be classified under one of the below category,
  System - Created by Kubernetes
  Public - Common resources
  Default - When no namespace is provided
  Admin - For admin roles

• When namespace is deleted, all respective pods will get deleted

Accessing resources:

• Create- create/ create -f yaml
• Read- get/ get -f yaml
• Update- edit / apply -f yaml
• Delete- delete / delete -f yaml

Debugging/Troubleshooting strategies

• Logs
• attach
• Exec
• Port forward
• copy
• auth

Deployment in Kubernetes:
1.Replication - controls number of replications without writing many yaml files
2.Controller - controls replication
3.Versioning - controls the version
4.Rollout - To roll out the changes(Recreate - Delete and create all the container and Rolling update)
5.RollBack - To roll back to the older version