A tool to restart a Docker container with a newer version of the image

repull

A tool to restart a Docker container with a newer version of an image used by the container

Often you may need to pull a newer version of an image to re-create an existing container, and you don't care much about the checkpoints because the application is stateless.

The usual way of doing that is to use

docker pull repo/app
docker kill containerId
docker rm containerId 
docker run --name xyz --link -v ... -p ... etc

This is quite tedious and requires to remember all the command line options that were used to start the container. With k8s or docker-compose it is possible to solve that, but for vanilla Docker containers it could be tricky.

repull simplifies it to the point of repull <containerid> <containername>....

It will

  1. iterate over the list of passed container ids or names
  2. fetch the description of the container
  3. identify the image used in the container
  4. lookup the information about the authentication in ~/.docker/config.json
  5. pull the new version of the image, if available for the current tag.
  6. kill the existing container
  7. remove the existing container
  8. start the new container with the newest image available preserving all configuration/startup options
  9. repeat for all images passed in the arguments.

Usage

./repull -h
Usage of ./repull:
  -v    verbose
Owner
Eugene
Eugene
https://github.com/jdevelop/repull
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Comments
  • build with latest docker api, fix go get issue

    build with latest docker api, fix go get issue

    • Fixes build issue with rename of Sirupsen/logrus → sirupsen/logrus
    • update docker api to v20
    • update remaining deps with go get -u all
    • improve call to containerWait() to wait on success & err
    • replace containerKill with containerStop

    BEFORE

    Go get was failing

    go get .
go get: github.com/Sirupsen/logrus@none updating to
        github.com/Sirupsen/[email protected]: parsing go.mod:
        module declares its path as: github.com/sirupsen/logrus
                but was required as: github.com/Sirupsen/logrus

    AFTER

    go get .
# success!

    Testing

    unit suite

    $ go test .
ok      github.com/jdevelop/repull      0.063s

    e2e

    $ docker restart watchtower
$ pi@pi4plus:~/src/repull $ go run . -v watchtower
DEBU[0000] inspecting container 9c1e389a60bfb5550f6df1e52305ff43aeb3681e1d941b0560aed94444a97d1c 
DEBU[0000] pulling a new image for container 9c1e389a60bfb5550f6df1e52305ff43aeb3681e1d941b0560aed94444a97d1c : [/watchtower] 
DEBU[0000] pulling image containrrr/watchtower          
INFO[0000] using default tag: latest                    
INFO[0001] received image id: sha256:3283e0b5be326d77ff4f4e8b7a91d46aaa1d511c74877b5a32f161548812d00c 
DEBU[0001] stopping container 9c1e389a60bfb5550f6df1e52305ff43aeb3681e1d941b0560aed94444a97d1c : [/watchtower] 
DEBU[0002] removing container 9c1e389a60bfb5550f6df1e52305ff43aeb3681e1d941b0560aed94444a97d1c : [/watchtower] 
DEBU[0002] replacing image containrrr/watchtower with sha256:3283e0b5be326d77ff4f4e8b7a91d46aaa1d511c74877b5a32f161548812d00c 
INFO[0003] started container f54560e7cd1369e26049dbc5564244cad9603b68c7ea079da65d64ef0c1ae20b
  • Dockerfile for repull – add install and run via docker (no go needed)

    Dockerfile for repull – add install and run via docker (no go needed)

    • add a docker file to allow users to install / run from docker
    • updated readme with docker & golang install steps
    • docker image is only 9.2MB

    Bugs / Issues

    • the cli interface is clumsy needing docker socket & config.json mount.

    Building

    # build
docker build . -t jdevelop/repull
# test run
docker run      \
   -v /var/run/docker.sock:/var/run/docker.sock\
   -v $HOME/.docker/config.json:/.docker/config.json   \
   jdevelop/repull -h
# push to docker hub
docker push jdevelop/repull

    Testing

    e2e

    $  docker run      -v /var/run/docker.sock:/var/run/docker.sock  -v$HOME/.docker/config.json:/.docker/config.json   tonymet/repull watchtower
time="2021-08-29T18:50:48Z" level=info msg="using default tag: latest\n"
time="2021-08-29T18:50:49Z" level=info msg="received image id: sha256:3283e0b5be326d77ff4f4e8b7a91d46aaa1d511c74877b5a32f161548812d00c"
time="2021-08-29T18:50:49Z" level=info msg="started container 42c9e474d38b00abaeffb3290955de6520877f8df8561bbb372916c1fbc02509

    check image size = 9.2MB

    $ docker images |head
REPOSITORY              TAG           IMAGE ID       CREATED         SIZE
repull                  latest        dd34402d5857   17 hours ago    9.19MB
  • Implement the flag `-p` to print the docker command line that was used to create a container.

    Implement the flag `-p` to print the docker command line that was used to create a container.

    The flag -p shall instruct repull to generate the command line for docker command that will create the container with the same mount points, network configuration and links to other containers, as appropriate,

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