Unable to start Bind9 service on Plesk server: include directives are deprecated

Symptoms

• Unable to start Bind9 service with the following error message:

  Dec 09 09:15:25 servername systemd[1]: /etc/systemd/system/bind9.service:1: .include directives are deprecated, and support for them will be removed in a future version of systemd.

• The following include statement can be found in Bind9 service config:

  # cat /etc/systemd/system/bind9.service
  .include /lib/systemd/system/bind9.service
  [Service]
  EnvironmentFile=-/etc/default/bind9.systemd
  ...

Cause

Misconfiguration of Bind9 service.

Resolution

1. Connect to the server via SSH.

2. Remove line with .include statement from /etc/systemd/system/bind9.service file using any text editor like vi.

3. Restart services:

   # systemctl daemon-reload

   # systemctl restart bind9