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Apache won’t start – Name or service not known: mod_unique_id

Minor cause of frustration when you are installing Apache on a server that some one else has configured, is that if they have not setup the hosts file correctly apache will refuse to start.

The error is in /var/log/apache2/error_log and looks like below:

Name or service not known: mod_unique_id: unable to find IPv4 address of WebServer

This can be easily fixed by formatting your /etc/hosts file correctly as below (This example uses the hostname “WebServer” replace that with the hostname of your machine)

# /etc/hosts: Local Host Database

# IPv4 and IPv6 localhost aliases	WebServer.core.lan WebServer localhost
::1		WebServer.core.lan WebServer localhost

Thats it, apache will start as normal now

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