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# Kubernetes Cheat Sheet
## kubectl CLI
### Context
| | |
|--------------------------------------|-----------------------------|
|`kubectl config current-context` |Get the current context |
|`kubectl config get-contexts` |List all context |
|`kubectl config use-context [contextName]`|Set the current context |
|`kubectl config delete-context [contextName]`|Delete a context from the config file|
### Namespace
| | |
|--------------------------------------|-----------------------------|
|`kubectl get namespace` |List all namespaces |
|`kubectl get ns` |Shortcut |
|`kubectl config set-context --current --namespace=[namespaceName]`|Set the current context to use a namespace|
|`kubectl create ns` |Create a namespace |
|`kubectl delete ns` |Delete a namespace |
|`kubectl get pods --all-namespaces` |List all pods in all namespaces|
### Misc.
| | |
|--------------------------------------|-----------------------------|
|`kubectl create -f [YAML file]` |Create an object using YAML |
---
### `kubectx`
- Separate program that acts as an alias for `kubectl config use-context`
- *Fast way to switch between clusters and namespaces in kubectl*
---
### Declarative vs Imperative
#### Declarative Example - YAML File
```yaml
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
type: front-end
spec:
containers:
name: nginx-container
image: nginx
```
#### Imperative Example - Series of commands
```sh
kubectl run mynginx --image=nginx --port=80
kubectl create deploy mynginx --image=nginx --port=80 --replicas=3
kubectl create service nodeport myservice --targetPort=8080
kubectl delete pod nginx
```
### Pod definition - required properties
- Root level required properties
- `apiVersion`
- Api version of the object
- `kind`
- type of object
- `metadata.name`
- unique name for the object
- `metadata.namespace`
- scoped environment name (will default to current)
- `spec`
- object specifications or desired state
---
### Namespace Example
Namespace definition:
```yaml
apiVersion: v1
kind: Namespace
metadata:
name: prod
```
Pod definition:
```yaml
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
namespace: prod
spec:
containers:
- name: nginx-container
- image: nginx
```
---
### Other kinds of YAML definitions
#### NetworkPolicy Example
```yaml
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
namespace: clientb
name: deny-from-other-namespaces
spec:
podSelector:
matchLabels:
ingress:
- from:
- podSelector: {}
```
#### ResourceQuota Example
```yaml
apiVersion: v1
kind: ResourceQuota
metadata:
name: compute-quota
namespace: prod
spec:
hard:
pods: "10"
limits.cpu: "5"
limits.memory: 10Gi
```
|
