Symptoms
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Apache fails to start. One of the following error messages appears in the Apache error log file:
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on CentOS/RHEL-based distributions:
/var/log/httpd/error_log -
on Debian/Ubuntu-based distributions:
/var/log/apache2/error.log
(EAI 2)Name or service not known: AH01564: unable to find IPv4 address of "server.example.com"
AH00016: Configuration Failed
(EAI 3)Temporary failure in name resolution: AH01564: unable to find IPv4 address of "ip-203-0-113-2"
AH00016: Configuration Failed -
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The following email notification might be sent to Plesk administrator:
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
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
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Go to Tools & Settings > Server Settings.
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In the Full hostname field, set the server hostname.
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Click OK.
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Go to Tools & Settings > Services Management and make sure Web Server (Apache) is started.
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Connect to the Plesk server via SSH.
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Open the file
/etc/hostsin a text editor. In this example, we are using the vi editor:# vi /etc/hosts
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Add a valid <IPv4 hostname> configuration:, for example:
203.0.113.2 server.example.com
- Server hostname can be edited in the file
/etc/hostnameor can be found with the commandhostname.
- Server hostname can be edited in the file
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Reboot the server.
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Verify that Apache has been started:
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on CentOS/RHEL-based distributions:
# service httpd status
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on Debian/Ubuntu-based distributions:
# service apache2 status
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