How can I use a local image as the base image with a dockerfile

Question

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

User · Answer

You can have - characters in your images. Assume you have a local image (not a local registry) named centos-base-image with tag 7.3.1611.

docker version 
      Client:
       Version:         1.12.6
       API version:     1.24
       Package version: docker-common-1.12.6-16.el7.centos.x86_64
       Go version:      go1.7.4

      Server:
       Version:         1.12.6
       API version:     1.24
       Package version: docker-common-1.12.6-16.el7.centos.x86_64
       Go version:      go1.7.4

docker images
 REPOSITORY            TAG
 centos-base-image     7.3.1611

Dockerfile

FROM centos-base-image:7.3.1611
RUN yum -y install epel-release libaio bc flex

Result

Sending build context to Docker daemon 315.9 MB
Step 1 : FROM centos-base-image:7.3.1611
  ---> c4d84e86782e
Step 2 : RUN yum -y install epel-release libaio bc flex
  ---> Running in 36d8abd0dad9
...

In the example above FROM is fetching your local image, you can provide additional instructions to fetch an image from your custom registry (e.g. FROM localhost:5000/my-image:with.tag). See https://docs.docker.com/engine/reference/commandline/pull/#pull-from-a-different-registry and https://docs.docker.com/registry/#tldr

Finally, if your image is not being resolved when providing a name, try adding a tag to the image when you create it

This GitHub thread describes a similar issue of not finding local images by name.

By omitting a specific tag, docker will look for an image tagged "latest", so either create an image with the :latest tag, or change your FROM

User · Answer

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

User · Answer

Verified  it works well in Docker 1 7 0  Don t specify --pull true when running the docker build command From this thread on reference locally-built image using FROM at dockerfile   If you want use the local image as the base image  pass without the option --pull true --pull true will always attempt to pull a newer version of the image

User · Answer

Remember to put not only the tag but also the repository in which that tag is  this way   docker images REPOSITORY                                TAG                       IMAGE ID            CREATED             SIZE elixir                                    1 7-centos7 3             e15e6bf57262        20 hours ago        925MB   You should reference it this way   elixir 1 7-centos7 3

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

Examples related to docker