Docker Import and Export


docker container export

This command is used to Export a container’s filesystem as a tar archive that can be shared across. To export the container, move the exported file to the target machine, and import that container.

Syntax

$ docker container export [OPTIONS] CONTAINER

Options

--output, -o: Write to a file, instead of STDOUT


Example


First, you need to create a  container. You'll be exporting them by name, so you need to know the names of those containers.

learning-ocean:~ gaurav$ docker container run -it ubuntu:14.04 bash
[email protected]013573bd0adb:/# apt-get update
Ign http://archive.ubuntu.com trusty InRelease
Get:1 http://security.ubuntu.com trusty-security InRelease [65.9 kB]
Get:2 http://archive.ubuntu.com trusty-updates InRelease [65.9 kB]
Get:3 https://esm.ubuntu.com trusty-infra-security InRelease           
Get:4 https://esm.ubuntu.com trusty-infra-updates InRelease  
Fetched 13.9 MB in 32s (428 kB/s)                                              
Reading package lists... Done   
[email protected]013573bd0adb:/#   


We will now install tree and git in the container-

root@013573bd0adb:/# apt-get install tree git -y

Come out from container using [CTRL+pq]

Now list the containers-

root@013573bd0adb:/# 
learning-ocean:~ gaurav$ docker container ls
CONTAINER ID  IMAGE         COMMAND         CREATED        STATUS             PORTS                      NAMES
013573bd0adb  ubuntu:14.04  "bash"          2 minutes ago  Up 2 minutes                                   nifty_hoover
learning-ocean:~ gaurav

Now, export the container-

learning-ocean:~ gaurav$ docker container export 01 -o myubuntu_free_git.tar

It can also be achieved using the below command-

learning-ocean:~ gaurav$ docker container export 01 > myubuntu_free_git1.tar


You can we have made two .tar files-

learning-ocean:test gaurav$ ls
myubuntu_free_git.tar	myubuntu_free_git1.tar




Importing a container


Like export, we can import the container with a single command. You must have the exported file to the target server.

Syntax

$ docker image file|URL|- [REPOSITORY[:TAG]]

Options

--output , -o: Write to a file, instead of STDOUT


Example


Lets list the images first-

learning-ocean:~ gaurav$ docker image ls
REPOSITORY           TAG                   IMAGE ID            CREATED           SIZE
ubuntu               14.04                 13b66b487594        3 months ago      197MB
learning-ocean:~ gaurav$ 


Importing the container image-

learning-ocean:~ gaurav$ docker image import myubuntu_free_git.tar myubuntu_free_git
sha256:aee602b47ab0aedc1da86543c14642a191701fa1b1e996a34a24400b9ef784a8
learning-ocean:~ gaurav$

Listing the images again-

learning-ocean:~ gaurav$ docker image ls

REPOSITORY             TAG            IMAGE ID       CREATED              SIZE
myubuntu_free_git      latest         aee602b47ab0   About a minute ago   215MB
ubuntu                 14.04          13b66b487594   3 months ago         197MB
learning-ocean:~ gaurav

As you can see we have the imported images as well.

Create a container out of the image and check if it has tree and git-

learning-ocean:~ gaurav$ docker container run -it myubuntu_free_git bash
root@b20fee9f36bf:/# cd /tmp/
root@b20fee9f36bf:/# tree --version 
tree v1.6.0 (c) 1996 - 2011 by Steve Baker, Thomas Moore, Francesc Rocher, Kyosuke Tokoro 
root@b20fee9f36bf:/tmp# git --version
git version 1.9.1
root@b20fee9f36bf:/tmp

This way you can import and export containers.