102 lines
3.1 KiB
Markdown
Executable File
102 lines
3.1 KiB
Markdown
Executable File
# Kubernetes
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## `kubectl` Command Reference
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### Get State of API Resources
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```bash
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kubectl api-resources
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```
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### Node Management
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- **Show all nodes:**
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```bash
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kubectl get node
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```
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### Namespace Management
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- **List all namespaces:**
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```bash
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kubectl get namespaces
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```
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```bash
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kubectl get ns
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```
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- **Create a custom namespace:**
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```bash
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kubectl create ns <namespace-name>
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```
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### Pod Management
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- **Get the list of pods in the default namespace:**
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```bash
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kubectl get pod
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```
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- **Get the list of pods in the default namespace with full information:**
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```bash
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kubectl get pod -o wide
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```
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- **Get the list of pods in a custom namespace with full information:**
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```bash
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kubectl get pod -o wide -n <name-space>
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```
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### Running a Pod
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- **Run a new pod:**
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```bash
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kubectl run <pod-name> <switch> {
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--image=<image-name>, # Specifies the container image to use
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--port=<portnumber>, # Specifies the port that the container exposes
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-n <namespace-name>, # Specifies the namespace
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--env="KEY=VALUE", # Sets environment variables in the container
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--command, # Treats the rest of the arguments as the command to run in the container
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--replicas=<number>, # Specifies the number of replicas for the deployment
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--labels="key=value,key2=value2", # Adds labels to the pod(s)
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--dry-run=client, # Prints the object that would be sent, without creating it
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--restart=<Always|OnFailure|Never>, # Determines the restart policy for the pod
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--overrides='<json>', # Provides a JSON override for the generated object
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--image-pull-policy=<policy>, # Specifies the image pull policy (Always, IfNotPresent, Never)
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--limits=cpu=<cpu>,memory=<memory>, # Specifies resource limits for the container
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--requests=cpu=<cpu>,memory=<memory> # Specifies resource requests for the container
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}
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```
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- *Example:*
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```bash
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kubectl run mypod --image=nginx --port=80 -n mynamespace \
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--env="ENV_VAR_NAME=VALUE" --command -- nginx -g "daemon off;" \
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--replicas=3 --labels="app=myapp,env=prod" --dry-run=client \
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--restart=Always --overrides='{"spec": {"containers": [{"name": "nginx", "image": "nginx"}]}}' \
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--image-pull-policy=IfNotPresent --limits=cpu=100m,memory=256Mi \
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--requests=cpu=50m,memory=128Mi
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```
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### Deleting a Pod
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- **Delete a pod in a custom namespace:**
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```bash
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kubectl delete pod -n <namespace-name> <pod-name>
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```
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### API Resource Documentation
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- **Get documentation of an API resource:**
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```bash
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kubectl explain <api-resource-name>
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```
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- *Example:*
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```bash
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kubectl explain pod
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```
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### Logging and Pod Information
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- **Get and follow logs of a pod (pod must be created and running):**
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```bash
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kubectl logs -f -n <namespace-name> <podname>
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```
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- **Get logs and state information of a pod (works at any time):**
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```bash
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kubectl describe pod -n <namespace-name> <podname>
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```
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### Apply Yaml File
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```bash
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kubectl apply -f <yaml-file> -n <namespace-name>
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``` |