Services and daemons

[rpjday]

Along with socket-mode, a socket keyword also has an attribute of “listen-stream”. https://github.com/snapcore/snapcraft/blob/main/snapcraft/projects.py#L161-L165

[picchietti]

@degville

install-mode Defines whether a freshly installed daemon is started automatically, or whether startup control is deferred to the snap. The snap could then use snapctl with a hook, for instance, or another management agent. Can be enable (default) or disable.

I found out something about install-mode today that isn’t documented here. If you have a service (oneshot, simple, etc), and install-mode is disable, then disabling and re-enabling the snap will cause those install-mode disabled services to be disabled again. This is somewhat counter-intuitive to the name “install-mode” because it triggers outside of an install.

So the relevant commands to reproduce this are:

sudo snap install mySnap
snap services mySnap # install-mode disabled services are disabled
sudo snap start --enable mySnap # manually enable services (maybe your snap uses snapctl instead)
snap services mySnap # install-mode disabled services are enabled
snap disable mySnap
snap services mySnap # all services are disabled
snap enable mySnap
snap services mySnap # only non install-mode disabled services are enabled