{% assign platform = include.platform %}

{% comment %}

Include a chunk of this file, using variables already set in the file
where you want to reuse the chunk.

Usage: {% include kubernetes-mac-win.md platform="mac" %}

{% endcomment %}

{% if platform == "mac" %}
  {% assign product = "Docker Desktop for Mac" %}

  {% capture min-version %}{{ product }} 18.06.0-ce-mac70 CE{% endcapture %}

  {% capture version-caveat %}
  **Kubernetes is only available in {{ min-version }} and higher.**
  {% endcapture %}

  {% capture local-kubectl-warning %}
> If you independently installed the Kubernetes CLI, `kubectl`, make sure that
> it is pointing to `docker-desktop` and not some other context such as
> `minikube` or a GKE cluster. Run: `kubectl config use-context docker-desktop`.
> If you experience conflicts with an existing `kubectl` installation, remove `/usr/local/bin/kubectl`.

  {% endcapture %}

  {% assign kubectl-path = "/usr/local/bin/kubectl" %}

{% elsif platform == "windows" %}
  {% assign product = "Docker Desktop for Windows" %}

  {% capture min-version %}{{ product }} 18.06.0-ce-win70 CE{% endcapture %}

  {% capture version-caveat %}
  **Kubernetes is only available in {{ min-version }} and higher.**
  {% endcapture %}

  {% capture local-kubectl-warning %}
  If you installed `kubectl` by another method, and experience conflicts, remove it.
  {% endcapture %}

  {% assign kubectl-path = "C:\>Program Files\Docker\Docker\Resources\bin\kubectl.exe" %}

{% endif %}

Docker Desktop includes a standalone Kubernetes server and client,
as well as Docker CLI integration. The Kubernetes server runs locally within
your Docker instance, is not configurable, and is a single-node cluster.

The Kubernetes server runs within a Docker container on your local system, and
is only for local testing. When Kubernetes support is enabled, you can deploy
your workloads, in parallel, on Kubernetes, Swarm, and as standalone containers.
Enabling or disabling the Kubernetes server does not affect your other
workloads.

See [{{ product }} > Getting started](/docker-for-{{ platform }}/#kubernetes) to
enable Kubernetes and begin testing the deployment of your workloads on
Kubernetes.

{{ kubectl-warning }}

## Use Docker commands

You can deploy a stack on Kubernetes with `docker stack deploy`, the
`docker-compose.yml` file, and the name of the stack.

```bash
docker stack deploy --compose-file /path/to/docker-compose.yml mystack
docker stack services mystack
```

You can see the service deployed with the `kubectl get services` command.

### Specify a namespace

By default, the `default` namespace is used. You can specify a namespace with
the `--namespace` flag.

```bash
docker stack deploy --namespace my-app --compose-file /path/to/docker-compose.yml mystack
```

Run `kubectl get services -n my-app` to see only the services deployed in the
`my-app` namespace.

### Override the default orchestrator

While testing Kubernetes, you may want to deploy some workloads in swarm mode.
Use the `DOCKER_STACK_ORCHESTRATOR` variable to override the default orchestrator for
a given terminal session or a single Docker command. This variable can be unset
(the default, in which case Kubernetes is the orchestrator) or set to `swarm` or
`kubernetes`. The following command overrides the orchestrator for a single
deployment, by setting the variable{% if platform == "mac"" %}
at the start of the command itself.

```bash
DOCKER_STACK_ORCHESTRATOR=swarm docker stack deploy --compose-file /path/to/docker-compose.yml mystack
```{% elsif platform == "windows" %}
before running the command.

```shell
set DOCKER_STACK_ORCHESTRATOR=swarm
docker stack deploy --compose-file /path/to/docker-compose.yml mystack
```

{% endif %}

Alternatively, the `--orchestrator` flag may be set to `swarm` or `kubernetes`
when deploying to override the default orchestrator for that deployment.

```bash
docker stack deploy --orchestrator swarm --compose-file /path/to/docker-compose.yml mystack
```

> **Note**
>
> Deploying the same app in Kubernetes and swarm mode may lead to conflicts with
> ports and service names.

## Use the kubectl command

The {{ platform }} Kubernetes integration provides the Kubernetes CLI command
at `{{ kubectl-path }}`. This location may not be in your shell's `PATH`
variable, so you may need to type the full path of the command or add it to
the `PATH`. For more information about `kubectl`, see the
[official `kubectl` documentation](https://kubernetes.io/docs/reference/kubectl/overview/).
You can test the command by listing the available nodes:

```bash
kubectl get nodes

NAME                 STATUS    ROLES     AGE       VERSION
docker-desktop       Ready     master    3h        v1.8.2
```

## Example app

Docker has created the following demo app that you can deploy to swarm mode or
to Kubernetes using the `docker stack deploy` command.

```yaml
version: "{{ site.compose_file_v3 }}"

services:
  web:
    image: dockersamples/k8s-wordsmith-web
    ports:
     - "80:80"

  words:
    image: dockersamples/k8s-wordsmith-api
    deploy:
      replicas: 5
      endpoint_mode: dnsrr
      resources:
        limits:
          memory: 50M
        reservations:
          memory: 50M

  db:
    image: dockersamples/k8s-wordsmith-db
```

If you already have a Kubernetes YAML file, you can deploy it using the
`kubectl` command.
