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Containerization & Orchestration/Kubernetes/3-Commands.md
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# Kubernetes
## `kubectl` Command Reference
### Get State of API Resources
# Kubernetes Command Reference
This document provides a reference for common `kubectl` commands used for managing Kubernetes clusters. Use the examples and explanations below to help manage nodes, namespaces, pods, deployments, and more.
## Table of Contents
- [Kubernetes Command Reference](#kubernetes-command-reference)
- [Table of Contents](#table-of-contents)
- [General Commands](#general-commands)
- [Node Management](#node-management)
- [Namespace Management](#namespace-management)
- [Pod Management](#pod-management)
- [Listing Pods](#listing-pods)
- [Running a Pod](#running-a-pod)
- [Deleting a Pod](#deleting-a-pod)
- [API Resources and Documentation](#api-resources-and-documentation)
- [Logs and Pod Information](#logs-and-pod-information)
- [Applying YAML Files](#applying-yaml-files)
- [Managing Nodes and Labels](#managing-nodes-and-labels)
- [Viewing Cluster Resources](#viewing-cluster-resources)
- [ReplicaSet and Deployment Management](#replicaset-and-deployment-management)
- [Additional Information](#additional-information)
---
## General Commands
- **List API Resources**
```bash
kubectl api-resources
```
### Node Management
- **Show all nodes:**
---
## Node Management
- **Show all nodes**
```bash
kubectl get node
```
### Namespace Management
- **List all namespaces:**
- **Set a label on a node**
```bash
kubectl label nodes <node-name> kubernetes.io/<label-key>=<label-value>
```
---
## Namespace Management
- **List all namespaces**
```bash
kubectl get namespaces
```
```bash
# or the abbreviated version:
kubectl get ns
```
- **Create a custom namespace:**
- **Create a custom namespace**
```bash
kubectl create ns <namespace-name>
```
### Pod Management
- **Get the list of pods in the default namespace:**
---
## Pod Management
### Listing Pods
- **List pods in the default namespace**
```bash
kubectl get pod
```
- **Get the list of pods in the default namespace with full information:**
- **List pods with detailed information (wide output) in the default namespace**
```bash
kubectl get pod -o wide
```
- **Get the list of pods in a custom namespace with full information:**
- **List pods with detailed information in a specific namespace**
```bash
kubectl get pod -o wide -n <name-space>
kubectl get pod -o wide -n <namespace-name>
```
### Running a Pod
- **Run a new pod:**
- **Run a new pod**
Use the following command structure to run a pod with various options:
```bash
kubectl run <pod-name> <switch> {
--image=<image-name>, # Specifies the container image to use
--port=<portnumber>, # Specifies the port that the container exposes
-n <namespace-name>, # Specifies the namespace
--env="KEY=VALUE", # Sets environment variables in the container
--command, # Treats the rest of the arguments as the command to run in the container
--replicas=<number>, # Specifies the number of replicas for the deployment
--labels="key=value,key2=value2", # Adds labels to the pod(s)
--dry-run=client, # Prints the object that would be sent, without creating it
--restart=<Always|OnFailure|Never>, # Determines the restart policy for the pod
--overrides='<json>', # Provides a JSON override for the generated object
--image-pull-policy=<policy>, # Specifies the image pull policy (Always, IfNotPresent, Never)
--limits=cpu=<cpu>,memory=<memory>, # Specifies resource limits for the container
--requests=cpu=<cpu>,memory=<memory> # Specifies resource requests for the container
--image=<image-name>, # Container image to use
--port=<port-number>, # Port that the container exposes
-n <namespace-name>, # Namespace in which to run the pod
--env="KEY=VALUE", # Environment variables for the container
--command, # Treat the following arguments as the command
--replicas=<number>, # Number of pod replicas to create
--labels="key=value,key2=value2", # Labels to assign to the pod(s)
--dry-run=client, # Print the object without creating it
--restart=<Always|OnFailure|Never>, # Pod restart policy
--overrides='<json>', # JSON override for the generated object
--image-pull-policy=<policy>, # Image pull policy (Always, IfNotPresent, Never)
--limits=cpu=<cpu>,memory=<memory>, # Resource limits for the container
--requests=cpu=<cpu>,memory=<memory> # Resource requests for the container
}
```
- *Example:*
- **Example:**
```bash
kubectl run mypod --image=nginx --port=80 -n mynamespace \
--env="ENV_VAR_NAME=VALUE" --command -- nginx -g "daemon off;" \
@@ -69,34 +126,118 @@ kubectl api-resources
--requests=cpu=50m,memory=128Mi
```
### Deleting a Pod
- **Delete a pod in a custom namespace:**
- **Delete a pod in a custom namespace**
```bash
kubectl delete pod -n <namespace-name> <pod-name>
```
### API Resource Documentation
- **Get documentation of an API resource:**
---
## API Resources and Documentation
- **Get documentation for an API resource**
```bash
kubectl explain <api-resource-name>
```
- *Example:*
```bash
kubectl explain pod
```
### Logging and Pod Information
- **Get and follow logs of a pod (pod must be created and running):**
---
## Logs and Pod Information
- **Stream logs for a running pod**
```bash
kubectl logs -f -n <namespace-name> <podname>
```
- **Get logs and state information of a pod (works at any time):**
```bash
kubectl describe pod -n <namespace-name> <podname>
kubectl logs -f -n <namespace-name> <pod-name>
```
### Apply Yaml File
- **Get detailed state and log information for a pod**
```bash
kubectl describe pod -n <namespace-name> <pod-name>
```
---
## Applying YAML Files
- **Apply configuration from a YAML file to a specific namespace**
```bash
kubectl apply -f <yaml-file> -n <namespace-name>
```
---
## Managing Nodes and Labels
- **Label a node with a custom key-value pair**
```bash
kubectl label nodes <node-name> kubernetes.io/<label-key>=<label-value>
```
---
## Viewing Cluster Resources
- **Display all resources loaded in a namespace**
```bash
kubectl get all -n <namespace-name>
```
- **Display replica sets, pods, and deployments in a specific namespace**
```bash
kubectl get rs,pod,deployment -n <namespace-name>
```
---
## ReplicaSet and Deployment Management
- **Scale a ReplicaSet**
```bash
kubectl scale rs <replicaset-name> -n <namespace-name> --replicas=<count>
```
- **View rollout history of a deployment**
```bash
kubectl rollout history deployment -n <namespace-name> <deployment-name>
```
- **View details of a specific revision in a deployment's rollout history**
```bash
kubectl rollout history deployment -n <namespace-name> <deployment-name> --revision <number>
```
- **Roll back a deployment to a specific revision**
```bash
kubectl rollout undo deployment -n <namespace-name> <deployment-name> --to-revision=<number>
```
> **Note:** The command for rolling back to a specific revision is `kubectl rollout undo` rather than using `--to-revision` with `kubectl rollout history`.
---
## Additional Information
- **Static Manifest Files**
All YAML files located under `/etc/kubernetes/manifests/` are automatically loaded after a server reboot.
---