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Tuesday, October 18, 2022

[FIXED] How can I use a local image as the base image with a dockerfile?

 October 18, 2022     docker     No comments   

Issue

I'm working on a dockerfile. I just realised that I've been using FROM with indexed images all along.

So I wonder:

  • How can I use one of my local (custom) images as my base (FROM) image without pushing it to the index?

Solution

You can use it without doing anything special. If you have a local image called blah you can do FROM blah. If you do FROM blah in your Dockerfile, but don't have a local image called blah, then Docker will try to pull it from the registry.

In other words, if a Dockerfile does FROM ubuntu, but you have a local image called ubuntu different from the official one, your image will override it.



Answered By - jpetazzo
Answer Checked By - Katrina (PHPFixing Volunteer)
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