When attempting to manage iscsi-scstd using a systemd service file,
systemd warns:
PIDFile= references a path below legacy directory /var/run/, [...]
Change the pidfile path to be under /run instead.
/run has been in use as a replacement for /var/run for many years now
(the original Debian proposal is from 2011). Most distributions symlink
/var/run to /run, which means that this change should not have any
adverse side effects for the vast majority of users.
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