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How to tell Docker to pull latest image for "sub-image"? – PHP Versions

Example from my PHP Dockerfile:

# Install composer
COPY --from=composer:latest /usr/bin/composer /usr/bin/composer

With that, I would expect to have the latest composer version in my container. But I have some old versions. When I do docker images I see that my composer:latest image is outdated:

composer                              latest                 8f2928e1f548   8 months ago     176MB

So what I do is:

docker-compose pull --include-deps
docker-compose up -d --build --remove-orphans

But, it only pulls the base images, not the ones I rely on via --from.

Is there some option I oversee? Or should I just require some specific version like :2.0.13? I’ve seen some blog posts about the :latest tag being not what it suggests to be.

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2

Answers


  1. 0

    The problem with :latest tag is that it doesn’t really mean that you are pulling the last update of that image, just the one they tagged as :latest.

    Many times it’s some versions outdated but it may be the last stable image, so it’s not a bad idea to use latest if you don’t have any preference on the version of the image.

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  2. 0

    First of all, you should understand that --include-deps works only for images that you set in the depends_on directive. Not for multistage.

    For your case, you probably should build your image without cache.

    docker build --pull --no-cache --tag myimage:version . before push to a repository
    or if you use build in your docker-compose file

    docker-compose build --no-cache --pull

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