Applicable to:
- Plesk for Linux
Symptoms
Plesk installation or update fails with the following error message:
CONFIG_TEXT: ...
Trying to resolve hostname ‘localhost.localdomain’ and validate its IP address…
Unable to resolve host name.
Please specify the host name in the /etc/hosts file or specify DNS configuration in the /etc/resolv.conf on your system.
ERROR while trying to check the hostname
....
Cause
Misconfiguration of the /etc/hosts
file or invalid PTR record.
Resolution
-
Connect to the server via SSH
-
Back up the current
/etc/hosts
file:# cp -a /etc/hosts{,.backup}
-
Edit the
/etc/hosts
file as follows:Note: The second line starting with
::1
should be added only if the system has IPv6. This can be verified with the following command:ip -6 a
CONFIG_TEXT: 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
203.0.113.2 plesk.example.com hostWhere:
-
203.0.113.2
is the main IP address
-plesk.example.com
is the hostname: How to change or get the server hostname on Plesk server -
Make sure that the main IP address has a valid PTR record resolving to a valid FQDN hostname:
# dig +short -x 203.0.113.2
plesk.example.com.
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