Description of problem:
apt-cacher-ng service can’t start because of there’s no /var/run/apt-cacher-ng directory.
As the /var/run is a runtime dir, I have to add following line into [Service] Section to make it running.
Version-Release number of selected component (if applicable):
Just install and then try start the service.
Steps to Reproduce:
1. yum install apt-cacher-ng
2. systemctl start apt-cacher-ng
3. systemctl status apt-cacher-ng
apt-cacher-ng failed to start
apt-cacher-ng started as a systemd monitored service