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gerrit.hackerspace.pl / hscloud / 793ca1b3b2c568d2165fefa1680247a1c72047d5
commit793ca1b3b2c568d2165fefa1680247a1c72047d5[log] [tgz]
authorSerge Bazanski <q3k@hackerspace.pl>Sun Mar 07 00:07:19 2021 +0000
committerSerge Bazanski <q3k@hackerspace.pl>Sun Mar 07 00:09:58 2021 +0000
tree13d8d1aefe9dcac3428768d742b0836d4fda71d1
parent3ba5c1b59112905a7736405414fc8bf0447b1006 [diff]
cluster/kube: limit OSDs in ceph-waw3 to 8GB RAM

Each OSD is connected to a 6TB drive, and with the good ol' 1TB storage
-> 1GB RAM rule of thumb for OSDs, we end up with 6GB. Or, to round up,
8GB.

I'm doing this because over the past few weeks OSDs in ceph-waw3 have
been using a _ton_ of RAM. This will probably not prevent that (and
instead they wil OOM more often :/), but it at will prevent us from
wasting resources (k0 started migrating pods to other nodes, and running
full nodes like that without an underlying request makes for a terrible
draining experience).

We need to get to the bottom of why this is happening in the first
place, though. Did this happen as we moved to containerd?

Followup: b.hswaw.net/29

Already deployed to production.

Change-Id: I98df63763c35017eb77595db7b9f2cce71756ed1
1 file changed
tree: 13d8d1aefe9dcac3428768d742b0836d4fda71d1
  1. app/
  2. bgpwtf/
  3. bzl/
  4. cluster/
  5. dc/
  6. devtools/
  7. doc/
  8. games/
  9. gcp/
  10. go/
  11. hswaw/
  12. kube/
  13. nix/
  14. ops/
  15. personal/
  16. third_party/
  17. tools/
  18. .bazelrc
  19. .gitignore
  20. BUILD
  21. ci_presubmit.sh
  22. COPYING
  23. default.nix
  24. env.fish
  25. env.sh
  26. hackdoc.toml
  27. OWNERS
  28. README.md
  29. shell.nix
  30. WORKSPACE
README.md

hscloud is the main monorepo of the Warsaw Hackerspace infrastructure code.

Any time you see a //path/like/this, it refers to the root of hscloud, ie. the path path/like/this in this repository. Perforce and/or Bazel users should feel right at home.

Viewing this documentation

For a pleaseant web viewing experience, see this documentation in hackdoc. This will allow you to read this markdown file (and others) in a pretty, linkable view.

Getting started

See //doc/codelabs for tutorials on how to use hscloud.

If you want to browse the source of hscloud in a web browser, use cs.hackerspace.pl.

If you want some other help, talk to q3k, informatic or your therapist.

Directory Structure

Directories you should care about:

  • app: external services that we host that are somewhat universal: matrix, covid-formity, etc.
  • bgpwtf: code related to our little ISP
  • cluster: code related to our Kubernetes cluster (k0.hswaw.net)
  • dc: code related to datacenter automation
  • devtools: code related to developer tooling, like gerrit or hackdoc
  • doc: high-level documentation that doesn't fit anywhere else, ie. codelabs
  • hswaw: Warsaw Hackerspace specific/internal services. The line between this and app is unfortunately blurry.
  • personal: user's personal (experimental) directories
  • kube, go: code specific to languages but general to the whole of hscloud

Licensing

Unless noted otherwise, code in hscloud is licensed under the BSD 0-clause license - see COPYING.