sort + groupby fanciness by @klausenbusk.

Fix #392

Jan Alexander Steffens (heftig) authored May 20, 2021 and Kristian Klausen committed Sep 27, 2021

- Allow killing of any cgroup if swap is about to run out. When swap is
  at least 90% full, oomd will kill a cgroup, tending to kill the cgroup
  with the highest swap usage.
- Allow killing cgroups of logged in users under severe memory pressure.
  When a cgroup is stalled waiting for memory at least 60% of the time,
  for at least 30 seconds, oomd will attempt to kill it or one of its
  descendant cgroups.

It has been applied upstream[1] and released with smartmontools 7.2[2].

[1] https://github.com/smartmontools/smartmontools/commit/61bc85ecadf9e5596b140380fed701a674e38a1b
[2] https://github.com/smartmontools/smartmontools/releases/tag/RELEASE_7_2

This reverts commit b4c97002.

It was removed in:
d9fdafb0 ("Use archlinux-contrib over git submodule")
c380c429 ("Remove old task to symlink checkservices to /usr/local/bin")

Leonidas Spyropoulos authored Apr 23, 2021 and Kristian Klausen committed Jul 30, 2021

This is shared between common and install_arch roles

Closed: #288

Signed-off-by: Leonidas Spyropoulos <artafinde@gmail.com>

Benedict Baskar authored Jul 24, 2021 and Kristian Klausen committed Jul 28, 2021

Fix #376

It's been running out of swap during borg-backup and seems to get good
compression ratios; try upping the zram size to 100% of RAM (from 50%).

When both zswap and zram are active, zswap sits in front of zram and
treats it as a backing store. We just want to use zram and not zswap
disguising itself as such; disable the latter so we can enjoy useful
zramctl statistics.

Implemented as tmpfiles.d/zram.conf which disables zswap at runtime.

Restarting swap.target doesn't apply configuration changes; instead we
can restart systemd-zram-setup@zram0 which seems to do what we wanted.

Without hostname the role does not run.

Kristian Klausen authored May 09, 2021 and Jelle van der Waa committed Jun 06, 2021

zram-generator defaults to 50% of the ram where systemd-swap defaults to
25% of the ram.

[1] https://lists.archlinux.org/pipermail/arch-dev-public/2021-May/030429.html

Leonidas Spyropoulos authored Apr 08, 2021 and Jelle van der Waa committed May 01, 2021

Kernel's OOM killer is often too slow, as a result system ends up
thrashing heavily. Have a user-space oom killer helps.

Using default settings as described in
https://www.freedesktop.org/software/systemd/man/oomd.conf.html

Closes: #306

Signed-off-by: Leonidas Spyropoulos <artafinde@gmail.com>

yaml: truthy value should be one of [false, true] (truthy)
yaml: wrong indentation: expected 4 but found 2 (indentation)
yaml: too few spaces before comment (comments)
yaml: missing starting space in comment (comments)
yaml: too many blank lines (1 > 0) (empty-lines)
yaml: too many spaces after colon (colons)
yaml: comment not indented like content (comments-indentation)
yaml: no new line character at the end of file (new-line-at-end-of-file)
load-failure: Failed to load or parse file
parser-error: couldn't resolve module/action 'hosts'. This often indicates a misspelling, missing collection, or incorrect module path.

It should also be installed before installing any packages with Ansible.

They were apparently controversial and more research is needed.

Kristian Klausen authored Oct 21, 2020 and Sven-Hendrik Haase committed Oct 22, 2020

Fix #155

Ansible's hostname supports setting the hostname with hostnamectl, which
makes our systems after the removal of inetutils legacy free.

This is needed for the role to work in containers. The option will also
be applied upstream, see the upstream ticket:
https://github.com/smartmontools/smartmontools/issues/62

Jelle van der Waa authored Aug 16, 2020 and Sven-Hendrik Haase committed Aug 27, 2020

Prefer using our maintained version of checkservices from the contrib
repository hosted on our Gitlab repository. This has the benefit of
getting rid of a submodule which isn't cloned by default.

This will move the audit messages from dmesg and reduce the duplication
in the journal.

roles/common: Replace Seblu's submodule with a submodule pointing to our contrib repository on Arch Linux's github.