---
approvers:
- bgrant0607
- brendandburns
- thockin
title: kubectl for Docker Users
---

In this doc, we introduce the Kubernetes command line for interacting with the api to docker-cli users. The tool, kubectl, is designed to be familiar to docker-cli users but there are a few necessary differences. Each section of this doc highlights a docker subcommand explains the kubectl equivalent.

* TOC
{:toc}

#### docker run

How do I run an nginx Deployment and expose it to the world? Checkout [kubectl run](/docs/user-guide/kubectl/{{page.version}}/#run).

With docker:

```shell
$ docker run -d --restart=always -e DOMAIN=cluster --name nginx-app -p 80:80 nginx
55c103fa129692154a7652490236fee9be47d70a8dd562281ae7d2f9a339a6db

$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
55c103fa1296        nginx               "nginx -g 'daemon of…"   9 seconds ago       Up 9 seconds        0.0.0.0:80->80/tcp   nginx-app
```

With kubectl:

```shell
# start the pod running nginx
$ kubectl run --image=nginx nginx-app --port=80 --env="DOMAIN=cluster"
deployment "nginx-app" created
```

`kubectl run` creates a Deployment named "nginx-app" on Kubernetes cluster >= v1.2. If you are running older versions, it creates replication controllers instead.
If you want to obtain the old behavior, use `--generator=run/v1` to create replication controllers. See [`kubectl run`](/docs/user-guide/kubectl/{{page.version}}/#run) for more details.
Note that `kubectl` commands will print the type and name of the resource created or mutated, which can then be used in subsequent commands. Now, we can expose a new Service with the deployment created above:

```shell
# expose a port through with a service
$ kubectl expose deployment nginx-app --port=80 --name=nginx-http
service "nginx-http" exposed
```

With kubectl, we create a [Deployment](/docs/concepts/workloads/controllers/deployment/) which will make sure that N pods are running nginx (where N is the number of replicas stated in the spec, which defaults to 1). We also create a [service](/docs/user-guide/services) with a selector that matches the Deployment's selector. See the [Quick start](/docs/user-guide/quick-start) for more information.

By default images are run in the background, similar to `docker run -d ...`, if you want to run things in the foreground, use:

```shell
kubectl run [-i] [--tty] --attach <name> --image=<image>
```

Unlike `docker run ...`, if `--attach` is specified, we attach to `stdin`, `stdout` and `stderr`, there is no ability to control which streams are attached (`docker -a ...`).
To detach from the container, you can type the escape sequence which is Ctrl+P
followed by Ctrl+Q.

Because we start a Deployment for your container, it will be restarted if you terminate the attached process (e.g. `ctrl-c`), this is different from `docker run -it`.
To destroy the Deployment (and its pods) you need to run `kubectl delete deployment <name>`.

#### docker ps

How do I list what is currently running? Checkout [kubectl get](/docs/user-guide/kubectl/{{page.version}}/#get).

With docker:

```shell
$ docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS                     PORTS                NAMES
14636241935f        ubuntu:16.04        "echo test"              5 seconds ago        Exited (0) 5 seconds ago                        cocky_fermi
55c103fa1296        nginx               "nginx -g 'daemon of…"   About a minute ago   Up About a minute          0.0.0.0:80->80/tcp   nginx-app
```

With kubectl:

```shell
$ kubectl get po -a
NAME                        READY     STATUS      RESTARTS   AGE
nginx-app-8df569cb7-4gd89   1/1       Running     0          3m
ubuntu                      0/1       Completed   0          20s
```

#### docker attach

How do I attach to a process that is already running in a container?  Checkout [kubectl attach](/docs/user-guide/kubectl/{{page.version}}/#attach).

With docker:

```shell
$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
55c103fa1296        nginx               "nginx -g 'daemon of…"   5 minutes ago       Up 5 minutes        0.0.0.0:80->80/tcp   nginx-app

$ docker attach 55c103fa1296
...
```

With kubectl:

```shell
$ kubectl get pods
NAME              READY     STATUS    RESTARTS   AGE
nginx-app-5jyvm   1/1       Running   0          10m

$ kubectl attach -it nginx-app-5jyvm
...
```

To detach from the container, you can type the escape sequence which is Ctrl+P
followed by Ctrl+Q.

#### docker exec

How do I execute a command in a container? Checkout [kubectl exec](/docs/user-guide/kubectl/{{page.version}}/#exec).

With docker:

```shell
$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
55c103fa1296        nginx               "nginx -g 'daemon of…"   6 minutes ago       Up 6 minutes        0.0.0.0:80->80/tcp   nginx-app

$ docker exec 55c103fa1296 cat /etc/hostname
55c103fa1296
```

With kubectl:

```shell
$ kubectl get po
NAME              READY     STATUS    RESTARTS   AGE
nginx-app-5jyvm   1/1       Running   0          10m

$ kubectl exec nginx-app-5jyvm -- cat /etc/hostname
nginx-app-5jyvm
```

What about interactive commands?


With docker:

```shell
$ docker exec -ti 55c103fa1296 /bin/sh
# exit
```

With kubectl:

```shell
$ kubectl exec -ti nginx-app-5jyvm -- /bin/sh      
# exit
```

For more information see [Getting a Shell to a Running Container](/docs/tasks/debug-application-cluster/get-shell-running-container/).

#### docker logs

How do I follow stdout/stderr of a running process? Checkout [kubectl logs](/docs/user-guide/kubectl/{{page.version}}/#logs).


With docker:

```shell
$ docker logs -f a9e
192.168.9.1 - - [14/Jul/2015:01:04:02 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.35.0" "-"
192.168.9.1 - - [14/Jul/2015:01:04:03 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.35.0" "-"
```

With kubectl:

```shell
$ kubectl logs -f nginx-app-zibvs
10.240.63.110 - - [14/Jul/2015:01:09:01 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.26.0" "-"
10.240.63.110 - - [14/Jul/2015:01:09:02 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.26.0" "-"
```

Now's a good time to mention slight difference between pods and containers; by default pods will not terminate if their processes exit. Instead it will restart the process. This is similar to the docker run option `--restart=always` with one major difference. In docker, the output for each invocation of the process is concatenated, but for Kubernetes, each invocation is separate. To see the output from a previous run in Kubernetes, do this:

```shell
$ kubectl logs --previous nginx-app-zibvs
10.240.63.110 - - [14/Jul/2015:01:09:01 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.26.0" "-"
10.240.63.110 - - [14/Jul/2015:01:09:02 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.26.0" "-"
```

See [Logging and Monitoring Cluster Activity](/docs/concepts/cluster-administration/logging/) for more information.

#### docker stop and docker rm

How do I stop and delete a running process? Checkout [kubectl delete](/docs/user-guide/kubectl/{{page.version}}/#delete).

With docker:

```shell
$ docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS                         NAMES
a9ec34d98787        nginx               "nginx -g 'daemon of"  22 hours ago        Up 22 hours         0.0.0.0:80->80/tcp, 443/tcp   nginx-app

$ docker stop a9ec34d98787
a9ec34d98787

$ docker rm a9ec34d98787
a9ec34d98787
```

With kubectl:

```shell
$ kubectl get deployment nginx-app
NAME        DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-app   1         1         1            1           2m

$ kubectl get po -l run=nginx-app
NAME                         READY     STATUS    RESTARTS   AGE
nginx-app-2883164633-aklf7   1/1       Running   0          2m

$ kubectl delete deployment nginx-app
deployment "nginx-app" deleted

$ kubectl get po -l run=nginx-app
# Return nothing
```

Notice that we don't delete the pod directly. With kubectl we want to delete the Deployment that owns the pod. If we delete the pod directly, the Deployment will recreate the pod.

#### docker login

There is no direct analog of `docker login` in kubectl. If you are interested in using Kubernetes with a private registry, see [Using a Private Registry](/docs/concepts/containers/images/#using-a-private-registry).

#### docker version

How do I get the version of my client and server? Checkout [kubectl version](/docs/user-guide/kubectl/{{page.version}}/#version).

With docker:

```shell
$ docker version
Client version: 1.7.0
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 0baf609
OS/Arch (client): linux/amd64
Server version: 1.7.0
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 0baf609
OS/Arch (server): linux/amd64
```

With kubectl:

```shell
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.9+a3d1dfa6f4335", GitCommit:"9b77fed11a9843ce3780f70dd251e92901c43072", GitTreeState:"dirty", BuildDate:"2017-08-29T20:32:58Z", OpenPaasKubernetesVersion:"v1.03.02", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.9+a3d1dfa6f4335", GitCommit:"9b77fed11a9843ce3780f70dd251e92901c43072", GitTreeState:"dirty", BuildDate:"2017-08-29T20:32:58Z", OpenPaasKubernetesVersion:"v1.03.02", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}
```

#### docker info

How do I get miscellaneous info about my environment and configuration? Checkout [kubectl cluster-info](/docs/user-guide/kubectl/{{page.version}}/#cluster-info).

With docker:

```shell
$ docker info
Containers: 40
Images: 168
Storage Driver: aufs
 Root Dir: /usr/local/google/docker/aufs
 Backing Filesystem: extfs
 Dirs: 248
 Dirperm1 Supported: false
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.13.0-53-generic
Operating System: Ubuntu 14.04.2 LTS
CPUs: 12
Total Memory: 31.32 GiB
Name: k8s-is-fun.mtv.corp.google.com
ID: ADUV:GCYR:B3VJ:HMPO:LNPQ:KD5S:YKFQ:76VN:IANZ:7TFV:ZBF4:BYJO
WARNING: No swap limit support
```

With kubectl:

```shell
$ kubectl cluster-info
Kubernetes master is running at https://108.59.85.141
KubeDNS is running at https://108.59.85.141/api/v1/namespaces/kube-system/services/kube-dns/proxy
kubernetes-dashboard is running at https://108.59.85.141/api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy
Grafana is running at https://108.59.85.141/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
Heapster is running at https://108.59.85.141/api/v1/namespaces/kube-system/services/monitoring-heapster/proxy
InfluxDB is running at https://108.59.85.141/api/v1/namespaces/kube-system/services/monitoring-influxdb/proxy
```
