Unable to see the contents in the docker container

Question

I am newbie to docker and trying to explore the features of docker. I created a container and stored some data on it and pushed it onto my docker account.

But, when I am pulling the same container I am not able to see the data which I stored in the container. Why my data is not available?

Where has my data gone?

UPDATE

I performed following steps:

ubuntu@domU-12-31-39-0A-11-9F:~$ sudo docker run -i -t ubuntu /bin/bash

Unable to find image 'ubuntu' locally Pulling repository ubuntu

xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete xxxxxxxxxxxx: Download complete

root@xxxxxxxxxxxx:

Here I did the changes and then I commited the container

ubuntu@domU-12-31-39-07-76-B4:~$ sudo docker commit xxxxxxxxxxxx ubuntu 0fd6b6b8acd3dc49947611e61077600a93a6285ebdcf45f1a8f73b4a26274fee

ubuntu@domU-12-31-39-07-76-B4:~$ sudo docker push myrepositoryname/ubuntu The push refers to a repository [myrepositoryname/ubuntu] (len: 1) Sending image list

Please login prior to push: Username: xxxx Password: Email: xxxxxxxx Login Succeeded The push refers to a repository [myrepositoryname/ubuntu] (len: 1) Sending image list Pushing repository myrepositoryname/ubuntu (1 tags) 511136ea3c5a: Image already pushed, skipping Image xxxxxxxxxxxx already pushed, skipping Image xxxxxxxxxxxx already pushed, skipping Image xxxxxxxxxxxx already pushed, skipping Pushing tag for rev [xxxxxxxxxxxx] on {https:// repository name}

After it I checked in my docker account, the image got pushed. After that I created a new account and pulled the image (I made the image public). But,I am not getting my data

ubuntu@domU-12-31-39-14-1D-8F:~$ sudo docker login

Username: xxxx Password: Email: xxxxxxxxxxxx Account created. Please use the confirmation link we sent to your e-mail to activate it.

ubuntu@domU-12-31-39-14-1D-8F:~$ sudo docker login

Username (xxxx): xxxxx

Login Succeeded

ubuntu@domU-12-31-39-14-1D-8F:~$ sudo docker pull myrepositoryname/ubuntu

Pulling repository myrepositoryname/ubuntu 6d38862b09be: Download complete 511136ea3c5a: Download complete 6170bb7b0ad1: Download complete 9cd978db300e: Download complete

ubuntu@domU-12-31-39-14-1D-8F:~$ sudo docker run -i -t myrepositoryname/ubuntu /bin/bash

root@7b7cc51fbd90:/# cd home/ root@7b7cc51fbd90:/home# ls

I stored my data in /home path but when I am checking there is no data

Answer 1

Did you create an image?

When you docker run an image (with n file layers, see http://docs.docker.io/en/latest/terms/layer/ ) you create an n+1 'th file layer on top of that. That is where you stored your data in. If you docker stop your container, that data remains in that layer, and when you re- docker start your container the data is still there.

However, if you docker run your image again, you make a different container which does not have that data.

Now, you want to send your data to the index (your Docker account). You can only send images, not containers, and the image you used does not contain this data. Therefore, you need to docker commit your container to a new image, and the you can docker push the resulting image. docker pull ing that should give you a startable image containing the data.