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 Unable to start Apache on a Plesk server: Unable to find IPv4 address of server.example.com

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Kuzma Ivanov
Updated
Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • Apache fails to start. One of the following error messages appears in the Apache error log file:

    • on CentOS/RHEL-based distributions: /var/log/httpd/error_log

    • on Debian/Ubuntu-based distributions: /var/log/apache2/error.log

    CONFIG_TEXT: (EAI 2)Name or service not known: AH01564: unable to find IPv4 address of "server.example.com"
    AH00016: Configuration Failed

    CONFIG_TEXT: (EAI 3)Temporary failure in name resolution: AH01564: unable to find IPv4 address of "ip-203-0-113-2"
    AH00016: Configuration Failed

  • The following email notification might be sent to Plesk administrator:

    CONFIG_TEXT: Unable to generate the web server configuration file on the host <server.example.com> because of the following errors: Template_Exception: Can not restart web server: file: /opt/psa/admin/plib/Service/Driver/Web/Server/Apache.php line: 109 code: 0

    CONFIG_TEXT: Unable to generate the web server configuration file on the host <server-hostname> because of the following errors:
    Template_Exception: Can not restart web server: Apache is down, start it instead of graceful Apache is down, start it instead of graceful

Cause

There is no IPv4 address specified in the /etc/hosts file for the server name configured in /etc/hostname file.

Resolution

  1. Log in to Plesk.

  2. Go to Tools & Settings > Server Settings.

  3. In the Full hostname field, set the server hostname.

  4. Click OK.

  5. Go to Tools & Settings > Services Management and make sure Web Server (Apache) is started.

 

Command-line instructions

 

  1. Connect to the Plesk server via SSH.

  2. Open the file /etc/hosts in a text editor. In this example, we are using the vi editor:

    # vi /etc/hosts

  3. Add a valid <IPv4 hostname> configuration:, for example:

    CONFIG_TEXT: 203.0.113.2 server.example.com

    • Server hostname can be edited in the file /etc/hostname or can be found with the command hostname.

  4. Reboot the server.

  5. Verify that Apache has been started:

    • on CentOS/RHEL-based distributions:

      # service httpd status

    • on Debian/Ubuntu-based distributions:

      # service apache2 status

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