Run a Docker Image as a Container

Question

I built a docker image from a dockerfile. I see the image was built successfully, but what do I do with it? Shouldn't it be able to run as a container?

New to docker so probably a misunderstanding on my end, any help would be great.

Answer 1

The specific way to run it depends on whether you gave the image a tag/name or not.

$ docker images
root@dockertest:~# docker images
REPOSITORY          TAG                 ID                  CREATED             SIZE
ubuntu              12.04               8dbd9e392a96        4 months ago        131.5 MB (virtual 131.5 MB)

With a name (let's use ubuntu):

$ docker run -i -t ubuntu:12.04 /bin/bash

Without a name, just using the ID:

$ docker run -i -t 8dbd9e392a96 /bin/bash

Please see https://docs.docker.com/engine/reference/run/ for more information.

Answer 2

Do following steps :

1. $ docker images

   you will get list of all local docker images with tags specified.

2. $ docker run image_name:tag_name

   If you didn't specify tag_name it will automatically run image with 'latest' tag.

   Instead of image_name you can also specify Image Id (no tag_name).

Answer 3

• To list the docker images

$ docker images

• If your application wants to run in with port 80 and you can expose a different port to bind locally say 8080

$ docker run -d --restart=always -p 8080:80 image_name:version

Answer 4

You can see your availables images using

docker images

Then you can run in detached mode so your terminal is still usable, you have severals option to run it using repository name ( with or without tag ) or image id

docker run -d repository
docker run -d repository:tag
docker run -d image_id

Then you can check your container is running using

docker ps

docker ps give you a container id, you can use it or just the 2/3 firsts character to go into your container using

docker exec -it container_id /bin/bash

and you can stop it using docker stop container_id and docker rm container_id

You can also run your container with -rm arguments so if you stop your container it will be automatically removed.

Answer 5

Get the name or id of the image you would like to run, with this command: docker images

The docker run command is used in the following way:

docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

Below I have included the dispatch, name, publish, volume and restart options before specifying the image name or id:

docker run -d --name  container-name -p localhost:80:80 -v $HOME/myContainer/configDir:/myImage/configDir --restart=always image-name

--detach , -d Run container in background and print container ID --name Assign a name to the container --publish , -p Publish a container’s port(s) to the host --volume , -v Bind mount a volume --restart Restart policy to apply when a container exits

For more information please check out the official docker run reference

Answer 6

Here is an example to run a webdev service in docker.
The image's name is morrisjobke/webdav. You can pull it from dockerhub.

After you run this images,you can then access the WebDAV instance at http://localhost:8888/webdav. Internally the folder /var/webdav is used as WebDAV root.

You can run this container in following way: $ docker run -d -e USERNAME=test -e PASSWORD=test -p 8888:80 morrisjobke/webdav

Answer 7

I had the same problem. I ran my docker and it created a container with a specific CONTAINER_ID and I wanted to work with the same container:

first run your docker:

$docker run -it -p 8888:8888 -p 6006:6006 -v ~/:/host waleedka/modern-deep-learning

Then list all container you have made:

$sudo docker ps -a

and select the container you want to work with (mine is 167ddd6d7f15)

$sudo docker start -ai 167ddd6d7f15

Answer 8

Since you have created an image from the docker-file,the image currently is not in active state. In order to work you need to run this image inside a container.

$ docker images command describes how many images are currently available in the local repository. and

docker ps -a 

shows how many containers are currently available i.e list of active and exited container

There are two ways to run the image in the container

$ docker run [OPTIONS] IMAGE[:TAG|@DIGEST] [COMMAND] [ARG...]

in detached mode

-d=false: Detached mode: Run container in the background, print new container id

in interactive mode

-i :Keep STDIN open even if not attached

Here is the docker run command

$ docker run image_name:tag_name

for more clarification on docker run you can visit https://docs.docker.com/engine/reference/run/

it's the best material to understand docker.