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Basic Kubectl Commands

Some of the basic kubectl commands apply to all k8s objects
  • used to group objects in the cluster
  • each namespace acts like a folder holding a set of objects
  • kubectl works with the default namespace by default
  • —namespace can be passed to specify a different one
  • can be used to change the default namespace, manage different clusters or different users for authenticating to them
  • To change the namespace to abc, run: $ kubectl config set-context my-context --namespace=abc
  • This command just creates a context. To run it, use: $ kubectl config use-context my-context
  • This records the change in the kubectl config file while is usually located at $HOME/.kube/config. This file also stores information related to finding and authenticating to the cluster.
Viewing Kubernetes API Objects
  • Everything is represented by a RESTful resource, called objects.
  • Each object has a unique HTTP endpoint scoped using namespaces.
  • kubectl uses these endpoints to fetch the objects
  • Viewing resources in the current namespace: kubectl get <resource-name>
  • Viewing a specific resource: kubectl get <resource-name> <object-name> Use describe instead of `get`` for more detailed information about the object
  • To get more info than normally displayed, use -o wide flag
  • To get raw JSON or YAML objects from the API server, use -o json-o yaml.
Creating, Updating, and Destroying Kubernetes Objects
  • k8s objects are represented using YAML or JSON files (each object has its own JSON/YAML file?)
  • used to manipulate objects on the server
  • To create an object described using obj.yamlkubectl apply -f obj.yaml K8s automatically infers the type, it doesn’t need to be specified.
Labeling and Annotating Objects
  • used to tag objects
  • kubectl label/annotate pods bar color=red adds the color=red label to a pod called bar.
  • To remove a label: kubectl label pods bar -color
Debugging Commands
To see logs for a container: kubectl logs <pod-name>
  • Use -c to choose a particular container
  • Use -f to stream logs to terminal
  • kubectl exec -it <pod-name> — bash provides an interactive shell within the container.


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