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Show HN: Retry a command with exponential backoff and jitter (+ Starlark exprs)

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72 points networked | 2 comments | 15 Nov 24 08:04 UTC | HN request time: 0.419s | source
1. westurner ◴[20 Nov 24 23:50 UTC] No.42199429[source]▶
Systemd does exponential retry but IDK about jitter?
replies(1): >>42200984 #
2. westurner ◴[21 Nov 24 04:03 UTC] No.42200984[source]▶
A systemd unit file with RestartMaxDelaySec= for exponential back off:

  [Unit]
  Description="test exponential retry"
  
  [Service]
  ExecStart=-/bin/sh -c "date -Is"
  Type=simple
  Restart=on-failure
  RestartSec=60ms
  RestartMaxDelaySec=¶
  RestartSteps=
  
  # StartLimitBurst=2
  # StartLimitIntervalSec=30
  
  # OnFailure=
   
  # TimeoutStartSec=
  # TimeoutStartFailureMode=
   
  # WatchdogSec=
   
  # RestartPreventExitStatus=
  # RestartForceExitStatus=
  
  # OOMPolicy=
   
  [Install]
  WantedBy=default.target
man systemd.service https://www.freedesktop.org/software/systemd/man/latest/syst...

man systemd.unit https://www.freedesktop.org/software/systemd/man/latest/syst...

man systemd.resource-control https://www.freedesktop.org/software/systemd/man/latest/syst...

man systemd.service > "Table 1. Exit causes and the effect of the Restart= settings" https://www.freedesktop.org/software/systemd/man/latest/syst...

"RFE: Exponentially increasing RestartSec=" https://github.com/systemd/systemd/issues/6129#issuecomment-...

"core: add RestartSteps= and RestartSecMax= to dynamically increase interval between auto restarts" https://github.com/systemd/systemd/pull/26902

> RestartSteps= accepts a positive integer as the number of steps to take to increase the interval between auto-restarts from RestartSec= to RestartMaxDelaySec=

/? RestartMaxDelaySec https://www.google.com/search?q=RestartMaxDelaySec

Is this where to add jitter?

"core/service: make restart delay increase more smoothly" https://github.com/systemd/systemd/pull/28266/files