K8s cheatsheet
=========

#### Show stuff

        kubectl get pods
        kubectl get pods node1
        kubectl get pods -o wide
        kubectl get pods bee -o wide
        kubectl get all
        kubectl get deployments

#### Create an NGINX Pod

- `kubectl run nginx --image=nginx`
- `kubectl run nginx --image=nginx --dry-run=client -o yaml`
- `kubectl run nginx --image=nginx --labels="tier=web"`

###### Deployment

- `kubectl create deployment --image=nginx nginx`
- `kubectl create deployment --image=nginx nginx --dry-run=client -o yaml`
- `kubectl create deployment nginx --image=nginx --replicas=4`
- `kubectl scale deployment nginx --replicas=4`
- `kubectl create deployment --image=nginx nginx --dry-run=client -o yaml > nginx-deployment.yaml`
- `kubectl create deployment --image=nginx nginx --replicas=4 --dry-run=client -o yaml > nginx-deployment.yaml`
- `kubectl create deployment --image=mojojo/secret secret` #this creates a deployment based on that image and names the deployment `secret`

###### Service

ClusterIP

- `kubectl expose pod redis --port=6379 --name redis-service --dry-run=client -o yaml`
- `kubectl create service clusterip redis --tcp=6379:6379 --dry-run=client -o yaml `
- `kubectl create service clusterip secret --tcp=8080:8080` #this creates a service named secret. It will automatically connect to the deployment named `secret`.

NodePort

- `kubectl expose pod nginx --type=NodePort --port=80 --name=nginx-service --dry-run=client -o yaml`
- `kubectl create service nodeport nginx --tcp=80:80 --node-port=30080 --dry-run=client -o yaml`

Loadbalancer

- `kubectl create service loadbalancer foo --tcp=8765:9376 --dry-run=client -o yaml`
- `kubectl expose deployment example --port=8765 --target-port=9376 --name=example-service --type=LoadBalancer`

###### Labels

- `kubectl get deployments.apps --show-labels`

###### Apply stuff from a file

- kubectl create -f nginx-deployment.yaml

##### Imperative commands

- `--dry-run=client allows you to preview the object that would be sent to your cluster without really submitting it.`
- `-o yaml: This will output the resource definition in YAML format on screen.`

###### Namespace

- `kubectl create namespace foonamespace`
- Can do most of the above commands in a different namespace by appending `--namespace=newnsname` to them. i.e. `kubectl get deployments --namespace=dev`.
- `kubectl get all -A` gets all resources in all namespaces