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Showing content from https://github.com/coreos/go-systemd below:

coreos/go-systemd: Go bindings to systemd socket activation, journal, D-Bus, and unit files

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:

https://github.com/coreos/go-systemd/tree/main/examples/activation/httpserver

The 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.

The dbus package connects to the systemd D-Bus API and lets you start, stop and introspect systemd units. API documentation is available online.

Create /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>

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.

The 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.

The login1 package provides functions to integrate with the systemd logind API.

The machine1 package allows interaction with the systemd machined D-Bus API.

The unit package provides various functions for working with systemd unit files.

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