Docker install and upgrade guide – CentOS and Ubuntu

knowledgepill.it

15 points·lukasbar··6 comments

> CentOS 7.1+ 64 bit version

good luck on CentOS 8. docker does not maintain el8 rpms, and installing the most recent offering from Docker requires that you work around several package conflict issues.

in the end it just didn't feel good, and i ended up going down the (clearly recommended) podman route instead. however, rootless podman containers have their own gotchas...

i kind of wish i'd installed debian on my homeserver instead. :)

Thanks for this comment, I’m so glad now I switched to Debian-based for my home server now as it’s essentially just docker+mdadm machine.

Where does the requirements of 4GB RAM per worker come from? That doesn’t seem right.

It’s fine, depending on what you plan to deploy. The how thing comes of as a bit disconnected, Docker doesn’t have worker or management node. I think this is part of some Docker Swarm thingy, but fails to make that clear.

The minimum requirements are absurd considering 2017 forum recommendations of 512MB[0], it runs just fine in 1-2GB of ram (depending on what's in the containers).. but the free disk space is low (images alone exceed this pretty quickly). The "must OSes" are inaccurate.. maybe article related (but Ubuntu 20 was out when this was written).. considering the basic content in this is almost identical to Docker's documentation[1][2] including line break positions in the commands.. I'm not sure what the value add of this is?

[0]: https://forums.docker.com/t/minimum-hardware-requirement-to-... [1]: https://docs.docker.com/engine/install/ubuntu/ [2]: https://docs.docker.com/engine/install/centos/

Docker also maintains an endpoint you can curl

curl -L https://get.docker.com | bash

does most of the repo / ppa adding for you

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