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/tmp on tmpfs, /var/tmp on disk

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This commit is contained in:
Casper V. Kristensen 2024-04-03 00:23:45 +02:00
parent 3ac3ee16b7
commit b67b843c13
1 changed files with 9 additions and 14 deletions
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23
modules/base/impermanence.nix
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@ -15,25 +15,11 @@
impermanence.nixosModules.impermanence impermanence.nixosModules.impermanence
]; ];
# We *don't* want to use tmpfs for /tmp in case we have to put big files
# there. Instead, we mount it to the disk and instruct systemd to clean it on
# boot.
# TODO: There might be a way to configure /tmp to be in-memory storage until
# it gets too big.
boot.tmp.cleanOnBoot = true;
# Each module will configure the paths they need persisted. Here we define # Each module will configure the paths they need persisted. Here we define
# some general system paths that don't really fit anywhere else. # some general system paths that don't really fit anywhere else.
environment.persistence."/nix/persist" = { environment.persistence."/nix/persist" = {
hideMounts = true; hideMounts = true;
directories = [ directories = [
# See comment above for /tmp
{
directory = "/tmp";
user = "root";
group = "root";
mode = "1777";
}
# The uid and gid maps for entities without a static id is saved in # The uid and gid maps for entities without a static id is saved in
# /var/lib/nixos. Persist to ensure they aren't changed between reboots. # /var/lib/nixos. Persist to ensure they aren't changed between reboots.
{ {
@ -55,6 +41,15 @@
group = "root"; group = "root";
mode = "0755"; mode = "0755";
} }
# /var/tmp is meant for temporary files that are preserved across
# reboots. Some programs might store files too big for in-memory /tmp
# there. Files older than 10 days are cleaned by systemd.
{
directory = "/var/tmp";
user = "root";
group = "root";
mode = "1777";
}
]; ];
files = [ files = [
"/etc/machine-id" # needed for /var/log "/etc/machine-id" # needed for /var/log