Add Redis Install doc

Containerization & Orchestration/Kubernetes/3-Commands.md

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+# Kubernetes
+
+## `kubectl` Command Reference
+
+### Get State of API Resources
+```bash
+kubectl api-resources
+```
+
+### Node Management
+- **Show all nodes:**
+  ```bash
+  kubectl get node
+  ```
+
+### Namespace Management
+- **List all namespaces:**
+  ```bash
+  kubectl get namespaces
+  ```
+  ```bash
+  kubectl get ns
+  ```
+- **Create a custom namespace:**
+  ```bash
+  kubectl create ns <namespace-name>
+  ```
+
+### Pod Management
+- **Get the list of pods in the default namespace:**
+  ```bash
+  kubectl get pod
+  ```
+- **Get the list of pods in the default namespace with full information:**
+  ```bash
+  kubectl get pod -o wide
+  ```
+- **Get the list of pods in a custom namespace with full information:**
+  ```bash
+  kubectl get pod -o wide -n <name-space>
+  ```
+
+### Running a Pod
+- **Run a new pod:**
+  ```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
+    }
+  ```
+  - *Example:*
+    ```bash
+      kubectl run mypod --image=nginx --port=80 -n mynamespace \
+      --env="ENV_VAR_NAME=VALUE" --command -- nginx -g "daemon off;" \
+      --replicas=3 --labels="app=myapp,env=prod" --dry-run=client \
+      --restart=Always --overrides='{"spec": {"containers": [{"name": "nginx", "image": "nginx"}]}}' \
+      --image-pull-policy=IfNotPresent --limits=cpu=100m,memory=256Mi \
+      --requests=cpu=50m,memory=128Mi
+    ```
+
+
+### Deleting a Pod
+- **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:**
+  ```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):**
+  ```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>
+  ```
+
+### Apply Yaml File
+```bash
+kubectl apply -f <yaml-file> -n <namespace-name>
+```