I lose my data when the container exits

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You need to commit the changes you make to the container and then run it. Try this:

sudo docker pull ubuntu

sudo docker run ubuntu apt-get install -y ping

Then get the container id using this command:

sudo docker ps -l

Commit changes to the container:

sudo docker commit <container_id> iman/ping

Then run the container:

sudo docker run iman/ping ping www.google.com

This should work.

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