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core: add RestartRandomizedDelaySec= service option

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We already support exponential backoff for automatic restarts via
RestartSec=/RestartSteps=/RestartMaxDelaySec=, but there is no way to
randomize the restart delay. When many instances of a service fail at
the same time (e.g. because a shared resource briefly went away) they
are all restarted in lockstep, creating a thundering herd problem.

So this commit adds a simple `RestartRandomizedDelaySec=` service
option which is similar to the timer `RandomizedDelaySec=` and
adds a randomized restart delay.
This commit is contained in:
Michael Vogt
2026-06-20 12:31:28 +02:00
committed by Lennart Poettering
parent 23b0bd230b
commit 046de3caea
10 changed files with 134 additions and 3 deletions
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src/shared/bus-unit-util.c
+1
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@@ -2695,6 +2695,7 @@ static const BusProperty service_properties[] = {
{ "GuessMainPID", bus_append_parse_boolean },
{ "RestartSec", bus_append_parse_sec_rename },
{ "RestartMaxDelaySec", bus_append_parse_sec_rename },
{ "RestartRandomizedDelaySec", bus_append_parse_sec_rename },
{ "TimeoutStartSec", bus_append_parse_sec_rename },
{ "TimeoutStopSec", bus_append_parse_sec_rename },
{ "TimeoutAbortSec", bus_append_parse_sec_rename },
src/shared/varlink-io.systemd.Unit.c
+2
View File
@@ -1429,6 +1429,8 @@ static SD_VARLINK_DEFINE_STRUCT_TYPE(
SD_VARLINK_DEFINE_FIELD(RestartSteps, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man/"PROJECT_VERSION_STR"/systemd.service.html#RestartMaxDelaySec="),
SD_VARLINK_DEFINE_FIELD(RestartMaxDelayUSec, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man/"PROJECT_VERSION_STR"/systemd.service.html#RestartRandomizedDelaySec="),
SD_VARLINK_DEFINE_FIELD(RestartRandomizedDelayUSec, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man/"PROJECT_VERSION_STR"/systemd.service.html#TimeoutStartSec="),
SD_VARLINK_DEFINE_FIELD(TimeoutStartUSec, SD_VARLINK_INT, SD_VARLINK_NULLABLE),
SD_VARLINK_FIELD_COMMENT("https://www.freedesktop.org/software/systemd/man/"PROJECT_VERSION_STR"/systemd.service.html#TimeoutStopSec="),