Summary of Common KUBECTL commands

Command KUBECTLKUBECTL output format

• Show pod for more information
  kubectl get pod <pod-name> -o wide
• Show pod details in YAML format
  kubectl get pod <pod-name> -o yaml

Kubectl Operation Example 1. Create a Resource object

• Create service and RC at once based on Yaml configuration file
  kubectl create -f my-service.yaml -f my-rc.yaml
• <directory>create operations based on the definition of all. Yaml,. yml,. json files in the directory
  kubectl create -f <directory>

2. View Resource Objects

• View All Pod Listings
  kubectl get pods
• View RC and Service lists
  kubectl get rc,service

3. Describe the resource object

• Show Node's details
  kubectl describe nodes <node-name>
• Show pod Details
  kubectl describe pods/<pod-name>
• Display information for pods managed by RC
  kubectl describe pods <rc-name>

4. Delete a Resource object

• Delete pod based on the name of the POD.YAML definition
  kubectl delete -f pod.yaml
• Remove all pods and service that contain a label
  kubectl delete pods,services -l name=<label-name>
• Delete all Pods
  kubectl delete pods --all

5. Command to execute a container

• The data command to execute the pod, which is performed by default with the first container in the pod
  kubectl exec <pod-name> data
• Specify a container in the pod to execute the data command
  kubectl exec <pod-name> -c <container-name> data
• Use bash to get a TTY for a container in the pod, equivalent to the login container
  kubectl exec -it <pod-name> -c <container-name> bash

6.Pod expansion and contraction capacity

• Perform an operation that expands the capacity of the indent pod
  kubectl scale rc redis --replicas=3

  We need to confirm that the number of replicas defined in the RC configuration file, when we execute the above command result is greater than the number of replicas, then we execute the command equivalent to the expansion operation, conversely, we can understand that the amount we fill is the number of pods we need. It is important to note that when we need to do a permanent expansion, don't forget to modify the number of replicas in the RC configuration file.

7.Pod Roll-up upgrade

• Perform a rolling upgrade operation
  kubectl rolling-update redis -f redis-rc.update.yaml

  It is important to note that when we rolling-update need to prepare a new RC configuration file and a Configmap configuration file before executing the command, the RC configuration file needs to specify the name of the image to be used after the upgrade, or you can kubeclt rolling-update redis --image=redis-2.0 upgrade directly by specifying the image name directly.

Source: https://www.cnblogs.com/Cherry-Linux/p/7866427.html

Summary of Common KUBECTL commands