[jonfw]

One thing I didn’t notice- what impact to the bottom line does kubernetes or docker bring?

I love shiny tools and containers as much as anybody, but “this thing is shiny and new age” isn’t a great pitch. Your team needs to have problems that kubernetes can solve.

If you don’t spend that much time on deployments, if outages don’t cost you much money- it is probably not worth it.

When I hear 200/k a year as revenue generating- I hear that this is something that should be limped along as cheap as possible, not that this is something that should be invested into and modernized.

[the__alchemist]

I had the same reaction. I would look more favorably on a company that doesn't use Docker or Kubernetes. These tools, by default make things complicated and slower, so there needs to be a positive benefit for their use case that balances this.

It makes me wonder whether OP's desired for testing and CI is for a specific reason, (e.g. targeted test on certain algorithms, CI/CD to replace manual QC steps etc), or if it's for less-practical reasons.

[sepositus]

> These tools, by default make things complicated and slower, so there needs to be a positive benefit for their use case that balances this.

I'm confused by this reasoning. How does Docker make things slower by default? Why would you look favorably on a company that doesn't use it?

  make
  scp mybin [e-mail]/deploy
  ssh [e-mail] -c 'systemctl restart myservice'

Or

  docker build
  docker push myimage@latest
  ssh [e-mail] -c 'docker-compose up'

At least with the second one, you have automatic artifact tracking for easier rollbacks.

[the__alchemist]

I would rather run software directly than wrap it in something, (and in this case, the wrapper isn't thin!) unless there are complex system dependencies. And that may be a smell of its own. Depends on the application.

[sepositus]

But that's a personal preference. I was asking how Docker makes things slower by default? Like, the act of using Docker means software delivery will necessarily slow down.

[flowerbreeze]

Adding an additional layer also means that layer needs to be managed at all times, and additional setup is required to use it. This starts at installing docker related tooling, having to do extra work to access logs inside containers, additional infrastructure management/maintenance (eg private repository), Docker compatibility between versions (it's not very good at maintaining that) etc.

The build/deployment time difference is maybe the least relevant, but also there most of the time, because Docker performs more work than simple zip+scp and an scp copy of the version to archive somewhere. Docker needs to copy far more than just the application files. Avoiding an extra copy of 100MB data (OS + required env) during deployment, if application files are only ~1-2MB tends to add quite a few seconds to the process, although how much it matters depends on network speed of course. For example on my modest connection it'd be ~8-10 seconds vs <1 second.

There are of course great reasons to use Docker such as a larger team that needs a common environment setup or when using languages that don't have great dependency management system (eg they have non-transferrable builds between systems), but it is something "extra" to maintain.

[sepositus]

Sure, in the grand scheme of things, though, I wouldn't argue that seconds is a legitimate slow down. I just really struggle to buy into the argument that "non-Docker" is superior and that introducing Docker is a problem. It's _another_ way to do deployments, and it's not strictly worse. There are tradeoffs on both sides, although I would argue Docker has far fewer than just using systemctl and SSH.

> Adding an additional layer also means that layer needs to be managed at all times, and additional setup is required to use it. This starts at installing docker related tooling, having to do extra work to access logs inside containers, additional infrastructure management/maintenance (eg private repository), Docker compatibility between versions (it's not very good at maintaining that) etc

Docker is available on every major distribution. Installing it once takes seconds. Accessing logs (docker logs mycontainer) takes just as long as systemctl (journalctl -u myservice). Maintaining a registry is optional, there are dozens of one-click SaaS services you can use you instantly get a registry, many of them free. Besides, I would consider the registry to have significantly more time-savings benefits due to being able to properly track builds.

> Docker needs to copy far more than just the application files. Avoiding an extra copy of 100MB data (OS + required env) during deployment

This is only partially true. Images are layered, and if the last thing you do is copy your binary to the image (default Docker practice), than it's possible for it to be exactly the same time as it's only downloading one new layer (the size of the application). Only on brand new machines (an irrelevant category to consider) is it fully true.