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I'm running Sidekiq 6.4.1 on an Ubuntu 20.04 system with Ruby 3.1.1 installed via Snap for a Rails 7 application.
Using this systemd template, I noticed something odd when deploying with Capistrano. When my cap script ran `sudo systemctl restart sidekiq`, the Sidekiq process would restart, briefly go active, then go inactive and stop running. I would need to SSH in and manually do a `systemctl restart sidekiq` in order to get the process back up and running.
With some experimentation, I found that changing the `Restart` configuration from `on-failure` to `always` seems to do the trick. Now, when the Sidekiq process goes inactive, it properly restarts and stays restarted.
I'm not 100% sure of the "why" behind what's going on, but this change seems to be effective and I have not noticed any side effects.
Documentation of previous behavior
Prior to deploy (process running)
```
root@stage-worker01:~# systemctl status sidekiq
● sidekiq.service - sidekiq
Loaded: loaded (/lib/systemd/system/sidekiq.service; enabled; vendor prese>
Active: active (running) since Thu 2022-03-24 16:34:32 UTC; 51s ago
Main PID: 118856 (bundle)
Tasks: 30 (limit: 1120)
Memory: 291.2M
CGroup: /system.slice/sidekiq.service
└─118856 sidekiq 6.4.1 staging [0 of 20 busy]
```
Immediately post deploy (process restarting)
```
root@stage-worker01:~# systemctl status sidekiq
● sidekiq.service - sidekiq
Loaded: loaded (/lib/systemd/system/sidekiq.service; enabled; vendor prese>
Active: activating (start) since Thu 2022-03-24 16:38:35 UTC; 9s ago
Main PID: 119572 (bundle)
Tasks: 0 (limit: 1120)
Memory: 43.4M
CGroup: /system.slice/sidekiq.service
‣ 119572 /var/www/sox/staging/shared/bundle/ruby/3.1.0/bin/sidekiq>
```
After deploy (process started)
```
Mar 24 16:38:35 stage-worker01.suggestionox.com systemd[1]: Starting sidekiq...
root@stage-worker01:~# systemctl status sidekiq
● sidekiq.service - sidekiq
Loaded: loaded (/lib/systemd/system/sidekiq.service; enabled; vendor prese>
Active: active (running) since Thu 2022-03-24 16:38:45 UTC; 3s ago
Main PID: 119572 (bundle)
Tasks: 0 (limit: 1120)
Memory: 43.4M
CGroup: /system.slice/sidekiq.service
‣ 119572 sidekiq 6.4.1 staging [0 of 20 busy]
Mar 24 16:38:35 stage-worker01.suggestionox.com systemd[1]: Starting sidekiq...
Mar 24 16:38:45 stage-worker01.suggestionox.com systemd[1]: Started sidekiq.
```
Failure (process inactive)
```
root@stage-worker01:~# systemctl status sidekiq
● sidekiq.service - sidekiq
Loaded: loaded (/lib/systemd/system/sidekiq.service; enabled; vendor prese>
Active: inactive (dead) since Thu 2022-03-24 16:38:56 UTC; 2s ago
Process: 119572 ExecStart=/usr/bin/env bundle exec sidekiq -e staging (code>
Main PID: 119572 (code=exited, status=0/SUCCESS)
Mar 24 16:38:35 stage-worker01.suggestionox.com systemd[1]: Starting sidekiq...
Mar 24 16:38:45 stage-worker01.suggestionox.com systemd[1]: Started sidekiq.
Mar 24 16:38:56 stage-worker01.suggestionox.com systemd[1]: sidekiq.service: Su>
```
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