Improve systemd integration

Hopefully this patch will fix all systemd-related problems:
- Proxy shell process (which converts signals to `rabbitmqtl stop`) will
  no longer be started under systemd. There is no need in it, as systemd
  unit already contains instructions for graceful shutdown.
- Ready notification for systemd will be sent with the help of `socat`,
  as `systemd-notify` is currently broken for non-root users. `socat` is
  the most lightweight way to do it (other options are using NIF or some
  external helper in Perl).
- epmd will not be able to interfere by sending it's own ready
  notifications.
- systemd journal will contain some additional messages about startup
  and shutdown sequence, just to be sure that everything is working
  correctly.

Fixes #664

1 files changed, 17 insertions, 0 deletions

diff --git a/docs/rabbitmq-server.service.example b/docs/rabbitmq-server.service.example
new file mode 100644
index 0000000000..5a8f1cd73e
--- /dev/null
+++ b/docs/rabbitmq-server.service.example
@@ -0,0 +1,17 @@
+# systemd unit example
+[Unit]
+Description=RabbitMQ broker
+After=syslog.target network.target
+
+[Service]
+Type=notify
+User=rabbitmq
+Group=rabbitmq
+NotifyAccess=all
+TimeoutStartSec=3600
+WorkingDirectory=/var/lib/rabbitmq
+ExecStart=/usr/lib/rabbitmq/bin/rabbitmq-server
+ExecStop=/usr/lib/rabbitmq/bin/rabbitmqctl stop
+
+[Install]
+WantedBy=multi-user.target