How to save and restore your docker image locally?
Every been in a situation where you have no access to an artifactory to store and retrieve docker images from? Maybe for those classified projects for which you cannot afford to have logic or code stored online? This blog post shows you how you can save your images locally, and also restore them.
In order to save a docker image locally, you will need to use the docker save command. This will generate a tarball the image that you specify. See below.
mukul@mukul-dev-vm:~$ docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
qca-python latest f6d5713920ab 21 hours ago 1.03GB
old-db latest c2cf969a8e83 43 hours ago 297MB
postgres <none> 131ab388dac1 8 days ago 200MB
jenkins-blueocean latest 7dfc5120d1b3 2 weeks ago 1.09GB
python 3 1b33974176a3 3 weeks ago 886MB
python latest 1b33974176a3 3 weeks ago 886MB
jenkins/jenkins 2.289.3-lts-jdk11 ea470c80c15d 3 weeks ago 680MB
testbed_ui_app_dev latest 875e9ba5520a 6 weeks ago 769MB
qca-schema-db latest 6df2ee35b15b 6 weeks ago 297MB
mumanika/test_machine 1 d481f0b6c1cc 8 weeks ago 466MB
postgres 9.6 3bd014396ae0 2 months ago 200MB
hello-world latest d1165f221234 5 months ago 13.3kB
centos centos8 300e315adb2f 8 months ago 209MB
ruby 2.2 6c8e6f9667b2 3 years ago 715MB
ruby 2.2.5-slim 2ddf5f283a22 4 years ago 270MB
mukul@mukul-dev-vm:~$ docker save mumanika/test_machine > test-save.tarIf you want to restore this image on a machine that is isolated from the internet, you will need to transfer this tar file to that machine and then run the following command.
meukul@mukul-dev-vm:~$ docker load -i test-save.tar
66edeb4546d5: Loading layer [==================================================>] 261.5MB/261.5MB
538d04b00012: Loading layer [==================================================>] 1.536kB/1.536kB
7eee7994848d: Loading layer [==================================================>] 334.3kB/334.3kB
d99130ae9368: Loading layer [==================================================>] 194kB/194kB
Loaded image: mumanika/test_machine:1Reference Documentation: https://docs.docker.com/engine/reference/commandline/save/
Simple, right? Hope this helps! ☺️