Systemd Declaring a Service Dependency

Internal

• systemd

Overview

This example shows how to declare a dependency between httpd and network services - the system should not attempt to start httpd unless the network service are started, otherwise httpd won't find the network interfaces to bind to.

Procedure

Create a httpd systemd service configuration directory

/etc/systemd/system/httpd.service.d

Create a httpd systemd service configuration file that expresses the dependency

Create a /etc/systemd/system/httpd.service.d/http-extra.conf file with the following content:

[Unit]
Requires=network-online.target
After=network-online.target

For more details on the structure of a systemd unit file, see the [Unit] section of a unit file.