CODEWITHSUNDEEP
dockerimagereplacecontainersupgrade
koayst
koayst

Reputation: 2125

Upgrade a Python module in existing Docker image

I pull a docker image and when I run it, I realized that one of the python libraries is an old version.

Can I create a Dockerfile by building on top on this existing image and then upgrade that library to latest version ?

What will be the Dockfile ?

Upvotes: 0

Views: 2273

Answers (1)

danijeljw-RPC
danijeljw-RPC

Reputation: 355

You can upgrade an existing Docker Image using a Dockerfile.

Create a file called requirements.txt and on each line put the name of the packages you wish to upgrade, even if it's just the one:

requirements.txt
Flask
gunicorn
Pillow

Then create another file called Dockerfile with no extension in the same directory:

Dockerfile
FROM python:3.8
COPY ./requirements.txt /tmp/requirements.txt
RUN pip install -r /tmp/requirements.txt

You can generate a Docker Image from this by using the command:

docker build --rm --no-cache --tag <tag>:<version> .

Replace <tag> with your new Docker Image name, and replace <version> with the version you want to assign it. If you are calling the Docker Image koaystCustomPyTool and want to omit the version, write the command like this:

docker build --rm --no-cache --tag koaystCustomPyTool .

Now when you run docker images you will see an output similar to this:

REPOSITORY           TAG       IMAGE ID       CREATED        SIZE
koaystCustomPyTool   latest    536d44c69a88   1 minute ago   275MB

If you need to provide a custom command to execute the Docker Image when you run it, add a line at the end of the Dockerfile like this:

CMD ["gunicorn", "-w", "2", "-b", ":8080", "poker.main:app"]

Here I have separated each command into it's own string value surrounded by double quotes " and wraped in square brackets [ and ].

Upvotes: 2

Related Questions