systemd unit files for multiple sidekiq workers

sidekiq.service

[Unit]
Description=Sidekiq workers
# start as many workers as you want here
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# ...

[Service]
Type=oneshot
ExecStart=/bin/true
RemainAfterExit=true

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[Unit]
Description=Sidekiq worker %I
# restarts/stops with sidekiq
PartOf=sidekiq.service
After=network.target

[Service]
# Run as a systemd notify service with watchdog support (sidekiq v6.0.6+)
Type=notify
WatchdogSec=5
# Modify to your application user/group/pwd
User=app
Group=app
UMask=0002
WorkingDirectory=/app
ExecStart=/app/bin/sidekiq -C config/sidekiq.yml -e production
# restart & stop send TERM to main process, wait up to 30 seconds, then KILL if still running
KillMode=mixed
TimeoutStopSec=30
# restart on non-zero exit or other failure after 5 seconds
Restart=on-failure
RestartSec=5
# don't create a new systemd.slice per instance
Slice=system.slice

This is out of date as of April 2023. -i is no longer a flag.
It looks like there is limited guidance other than ~ Sidekiq Pro or Foreman make it really easy.

This is out of date as of April 2023. -i is no longer a flag.

I've just removed -i. It was an old option required for sidekiq pro's reliable fetch, but is no longer used.

The rest of the example should work.

@sj26 very helpful thank you so much.