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Merge pull request #85735 from nh2/journald-storage-limit-logs

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journald service docs: Add helpful comments about the journal getting full
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Florian Klink 2020-04-23 13:35:12 +02:00 committed by GitHub
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nixos/modules/system/boot/systemd.nix
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@ -593,6 +593,9 @@ in
each other's limit. The value may be specified in the following
units: s, min, h, ms, us. To turn off any kind of rate limiting,
set either value to 0.
See <option>services.journald.rateLimitBurst</option> for important
considerations when setting this value.
'';
};
@ -604,6 +607,19 @@ in
interval) that is applied to all messages generated on the system.
This rate limiting is applied per-service, so that two services
which log do not interfere with each other's limit.
Note that the effective rate limit is multiplied by a factor derived
from the available free disk space for the journal as described on
<link xlink:href="https://www.freedesktop.org/software/systemd/man/journald.conf.html">
journald.conf(5)</link>.
Note that the total amount of logs stored is limited by journald settings
such as <literal>SystemMaxUse</literal>, which defaults to a 4 GB cap.
It is thus recommended to compute what period of time that you will be
able to store logs for when an application logs at full burst rate.
With default settings for log lines that are 100 Bytes long, this can
amount to just a few hours.
'';
};