BIND fails to start on Plesk server with Debian 9: couldn’t mkdir ‘//run’: Permission denied

Symptoms

• Plesk is installed on Debian 9:

  # plesk version
  Product version: Plesk Onyx 17.8.11 Update #14
  Update date: 2018/07/21 05:16
  Build date: 2018/07/03 10:11
  OS version: Debian 9.5

• BIND9 service unable to start with the following errors in the file /var/log/syslog:

  named[18893]: couldn't mkdir '//run': Permission denied
   named[18893]: could not create //run/named/session.key 
   named[18893]: failed to generate session key for dynamic DNS: permission denied

Cause

Incorrect configuration of the service bind9 in the file /lib/systemd/system/bind9.service.

Resolution

1. Connect to the server via using SSH.

2. Backup the original file:

   # cp /lib/systemd/system/bind9.service /lib/systemd/system/bind9.service.backup

3. Download the default version of the file /lib/systemd/system/bind9.service and unpack it:

   # wget https://plesk.zendesk.com/hc/article_attachments/360032575953/bind9.tar.gz
   # tar -xf bind9.tar.gz

4. Move to the unpacked file to the required directory:

   # mv -f bind9.service /lib/systemd/system/

5. Ensure that the the directory for the session key is exists:

   # mkdir -p /var/named/run-root/run/named
   # chown -R bind:bind /var/named/run-root/run

6. Reload the systemd configuration and start BIND:

   # systemctl daemon-reload
   # systemctl start bind9