![]() ![]() If you’re working with an image which is tagged with “latest”, that’s all the information you have apart from the image ID. You should avoid using the :latest tag when deploying containers in production, because this makes it hard to track which version of the image is running and hard to roll back. The Kubernetes docs are pretty clear on using Docker images with the :latest tag in production environments: Latest is Not Descriptive and Hard to Work With Team member pushes their version in the meanwhile. Any developer who does not provide an image tagĬan overwrite the :latest image without meaning to.Īlso, imagine the confusion which can be caused if you rely on :latest pointing to your most recent image, but another Imagine your image building scripts are a bit off, or used incorrectly. I’m weary of using latest on a team as I can see somebody forgetting to tag a build ![]() Latest is however the default value, which makes it both vulnerable to human mistakes and If you are not pushing it explicitly, the :latest tag will stay the same. $ docker build -t company/image_name:0.2. $ docker build -t company/image_name:0.1. If you push a new image with a tag which is neither empty nor ’latest’, :latest will notīe affected or created. So many people are not realizing that :latest is not dynamic $ docker build -t company/image_name:latest. Those two commands will both result in a new image being created and tagged as :latest: # those two are the same: It’s just the tag which is applied to an image by default which does not have a tag. Some people expect that :latest always points to the most-recently-pushed version of an image. ![]() The ’latest’ tag does not actually mean latest, it doesn’t mean anything Let’s go over the most frequent misconceptions and ways in which the :latest tag can cause suffering - and how to avoid the :latest pain. Latest is a proliferating ball of confusion that should be avoided like a ravine full of venomous snakesĭocker images tagged with :latest have caused many people a lot of trouble.īut what exactly is wrong with the :latest tag? Should you avoid it completely when working with Docker images? Loads a tarred repository from a file or the standard input streamīy using load you can import the image(s) in the same way they were originally created with the metadata from the Dockerfile, so you can directly run them with docker run.Do not run any container with the latest tag. ![]() what the CMD to run is.)ĭocker load creates potentially multiple images from a tarred repository (since docker save can save multiple images in a tarball). However, once those tarballs are produced, load/import are there to:ĭocker import creates one image from one tarball which is not even an image (just a filesystem you want to import as an image)Ĭreate an empty filesystem image and import the contents of theīy itself, this imported image will not be able to be run from docker run, since it has no metadata associated with it (e.g. It is often used when one wants to "flatten" an image, as illustrated in " Flatten a Docker container or image" from Thomas Uhrig: docker export | docker import - some-image-name:latest Docker save will indeed produce a tarball, but with all parent layers, and all tags + versions.ĭocker export does also produce a tarball, but without any layer/history. ![]()
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