:: [DNG] To docker or not to docker?
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Autor: Alessandro Vesely
Data:  
Para: Devuan users
Assunto: [DNG] To docker or not to docker?
Hi all,

I happily arrived till here without ever using docker. Now I'd want to install
a package whose installation howto starts like so:

     The easiest way to install Grist is as a container. We will describe
     how using Docker, but there are many other tools and services for
     running containers.


Hm...

I installed docker and tried to run it. (I use -----begin---- and
-----end----- markers for clarity.)

-----begin-----
ale@pcale:~$ docker run hello-world
docker: permission denied while trying to connect to the Docker daemon socket
at unix:///var/run/docker.sock: Post
"http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/create": dial unix
/var/run/docker.sock: connect: permission denied.
-----end-----

Allright, then sudo:

-----begin-----
ale@pcale:~$ sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
c1ec31eb5944: Pull complete
Digest: sha256:5b3cc85e16e3058003c13b7821318369dad01dac3dbb877aac3c28182255c724
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
  1. The Docker client contacted the Docker daemon.
  2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
     (amd64)
  3. The Docker daemon created a new container from that image which runs the
     executable that produces the output you are currently reading.
  4. The Docker daemon streamed that output to the Docker client, which sent it
     to your terminal.


To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/

For more examples and ideas, visit:
https://docs.docker.com/get-started/
-----end-----

Compare that behavior with the following one:

-----begin-----
ale@pcale:~$ sudo pip3 install oletools
error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
     python3-xyz, where xyz is the package you are trying to
     install.


     If you wish to install a non-Debian-packaged Python package,
     create a virtual environment using python3 -m venv path/to/venv.
     Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
     sure you have python3-full installed.


     If you wish to install a non-Debian packaged Python application,
     it may be easiest to use pipx install xyz, which will manage a
     virtual environment for you. Make sure you have pipx installed.


     See /usr/share/doc/python3.11/README.venv for more information.


note: If you believe this is a mistake, please contact your Python installation
or OS distribution provider. You can override this, at the risk of breaking
your Python installation or OS, by passing --break-system-packages.
hint: See PEP 668 for the detailed specification.
-----end-----


Is someone using docker? How do you prevent breaking the environment?

Meanwhile, I'll look for methods to dedockerize grist.


Best
Ale
--