Go bindings to systemd. The project has several packages:
activation- for writing and using socket activation from Go
daemon- for notifying systemd of service status changes
dbus- for starting/stopping/inspecting running services and units
journal- for writing to systemd's logging service, journald
sdjournal- for reading from journald by wrapping its C API
login1- for integration with the systemd logind API
machine1- for registering machines/containers with systemd
unit- for (de)serialization and comparison of unit files
An example HTTP server using socket activation can be quickly set up by following this README on a Linux machine running systemd:
systemd Service Notification
daemon package is an implementation of the sd_notify protocol. It can be used to inform systemd of service start-up completion, watchdog events, and other status changes.
dbus package connects to the systemd D-Bus API and lets you start, stop and introspect systemd units. The API docs are here:
/etc/dbus-1/system-local.conf that looks like this:
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd"> <busconfig> <policy user="root"> <allow eavesdrop="true"/> <allow eavesdrop="true" send_destination="*"/> </policy> </busconfig>
Writing to the Journal
Using the pure-Go
journal package you can submit journal entries directly to systemd's journal, taking advantage of features like indexed key/value pairs for each log entry.
Reading from the Journal
sdjournal package provides read access to the journal by wrapping around journald's native C API; consequently it requires cgo and the journal headers to be available.
login1 package provides functions to integrate with the systemd logind API.
machine1 package allows interaction with the systemd machined D-Bus API.
unit package provides various functions for working with systemd unit files.