With the previous way systemd services were exported, you had to enable every single process one by one to get the service operational.
Consider the following Procfile:
web: bundle exec thin start
worker: bundle exec worker start
Exported with:
foreman export systemd /usr/lib/systemd/system -a myapp -c worker=3
You will have to perform the following to start the service:
systemctl enable myapp-web-1.service
systemctl enable myapp-worker-1.service
systemctl enable myapp-worker-2.service
systemctl enable myapp-worker-3.service
systemctl enable myapp-web.target
systemctl enable myapp-worker.target
systemctl start myapp.target
Thats 7 commands, and you have to know the names of each service. Nasty.
With the changes here, you will have to perform the following:
systemctl enable myapp.target
systemctl start myapp.target
You can also `systemctl start myapp.target` without enabling as well. Previously if you tried to start `myapp.target` without enabling each individual process it would not work.
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Additionally, this change also adds the dependency to 'multi-user.target' (the default behavior for all services). This will properly shut down (or start) the app when the system changes runlevels. The previous method did not do this.
http://0pointer.de/blog/projects/systemd.html
This adds support for exporting systemd targets and services. The
structure is based on the existing upstart support.
Quality is draft and expected to refine in the coming weeks.
One Foremanism that is not respected by these export templates is the
usual log output location, instead stdout and stderr go to syslog.
Since signals will no longer be handled once foreman goes into
`terminate_gracefully`, default signal handlers are restored so as
not to cause it to get stuck in an unTERMable state.
This necessitates not using the process group for signalling
except as a last resort, as foreman itself will receive the signals
it sends. This splits `killall` into two methods, one which
signals only processes foreman itself has started, and one which
signals all processes in the process group to try to clean up
more aggressively, and then reworks `terminate_gracefully` to use
them.
Some processes close their output channels and IO.select keeps
returning them as "readable", while IO#gets returns nil on them, thus
spending a lot of CPU looping through the same reader continuously
Foreman should be the process leader before killing processes using
his process group id.
Before that foreman was broken when it was not spawned from a shell.
This fixes the stdout code to ensure that empty lines are outputted.
Many times, these blank lines are intentional, so foreman should not
suppress them.
This fixes#286
It's better to not force the use of a package manager. Better to add it
to the global RUBYOPT if needed. Also, this fixes a dependency issue
when using the .deb package (rubygems1.9.1 is not required, and should
not be).
Patrick Hemmer