# kubectl

kubectl is the main command line tool for k8s. See [reference](https://kubernetes.io/docs/reference/kubectl/conventions/)

## Raw commands

Sometimes it's handy to just run a container without all the yaml mess.

### Running a container

```sh
kubectl run --image=IMAGE name
```

### apply is not always the answer

Even if you see `kubectl apply` everywhere sometimes it's handy to use dedicated commands

For example, `kubectl create` is used to create a ressource and will throw an error if a ressource already exists.

#### Imperative commands quick reference

Do not forget that `--dry-run=client` can be usefull

##### Create a simple pod

```sh
kubectl run nginx --image=nginx
```

##### Create a deployement

```sh
kubectl create deployment --image=nginx nginx
```

**Gotcha**, deployement do not have a `--replicas` option, you need to use `kubctl scale` after deployement creation

### Generating a manifests, blazzing fast way

```sh
kubectl run app --image=app --dry-run=client -o yaml
```

```sh
kubectl create deployment --image=redis redis --dry-run=client -o yaml
```

Of course, if you need to write it into a file

```sh
kubectl create deployment --image=redis redis --dry-run=client -o yaml > deploy-manifest.yml
```

### Switching namespaces contexts

```sh
kubectl config set-config $(kubectl config current-context) --namespace=target
```