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#+TITLE: Syncthing Service Conflict Issue
#+DATE: 2026-01-21
* Problem
archsetup enables the system service:
#+begin_src bash
systemctl enable "syncthing@$username.service"
#+end_src
However, the user service can also get enabled (either by default or manually):
#+begin_src bash
systemctl --user enable syncthing.service
#+end_src
When BOTH services are enabled, they fight over the same lock file:
=~/.local/state/syncthing/syncthing.lock=
This causes one or both to fail with:
: Failed to acquire lock: is another Syncthing instance already running?
* Symptoms
- Syncthing fails to start or keeps crashing
- Lock file errors in journalctl
- Two syncthing processes running with different parent services
- Config changes don't persist (one service overwrites the other)
* Recommendation
Standardize on ONE service type. Options:
** Option A: User Service (recommended for desktops)
Runs when user logs in. Cleaner for desktop use.
Change archsetup from:
#+begin_src bash
systemctl enable "syncthing@$username.service"
#+end_src
To:
#+begin_src bash
# Enable user service (requires user session)
sudo -u "$username" systemctl --user enable syncthing.service
#+end_src
Note: User services require lingering or an active session:
#+begin_src bash
loginctl enable-linger "$username"
#+end_src
** Option B: System Service (recommended for headless/servers)
Runs at boot without user login. Better for servers.
Keep current archsetup config, but ensure user service is disabled:
#+begin_src bash
systemctl enable "syncthing@$username.service"
# Explicitly disable user service to prevent conflicts
sudo -u "$username" systemctl --user disable syncthing.service 2>/dev/null || true
#+end_src
* Resolution on ratio (2026-01-21)
Disabled system service, kept user service:
#+begin_src bash
sudo systemctl stop syncthing@cjennings.service
sudo systemctl disable syncthing@cjennings.service
systemctl --user enable syncthing.service
systemctl --user start syncthing.service
#+end_src
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