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Systemd and D-Bus configuration
=======================
**Table of contents**
1. [Introduction](#introduction)
2. [Systemd configuration](#systemd-configuration)
3. [Dbus configuration](#dbus-configuration)
Introduction
------------
To run executable as a systemd service you may need some additional setup. For example, you may need explicitly allow the usage of your service. Following chapters contain template configurations.
Systemd configuration
---------------------------------------
Filename should use `.service` extension. It also must be placed in configuration directory (/etc/systemd/system in Ubuntu 18.04.1 LTS)
```
[Unit]
Description=nameOfService
[Service]
ExecStart=/path/to/executable
[Install]
WantedBy=multi-user.target
```
D-Bus configuration
------------------
Typical default D-Bus configuration does not allow to register services except explicitly allowed. To allow a service to register its D-Bus API, we must place an appropriate conf file in `/etc/dbus-1/system.d/` directory. The conf file name must be `<service-name>.conf`. I.e., full file path for Concatenator example from sdbus-c++ tutorial would be `/etc/dbus-1/system.d/org.sdbuscpp.concatenator.conf`. And here is template configuration to use its D-Bus interface under root:
```
<!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 own="org.sdbuscpp.concatenator"/>
<allow send_destination="org.sdbuscpp"/>
<allow send_interface="org.sdbuscpp.concatenator"/>
</policy>
</busconfig>
```
If you need access from other user then `root` should be substituted by desired username. Or you can simply use policy `<policy context="default">` like [conf file](/tests/integrationtests/files/org.sdbuscpp.integrationtests.conf) for sdbus-c++ integration tests is doing it. For more information refer to `man dbus-daemon`.
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