Problem with restarting Apache 2 [duplicate]

I'm trying to restart Apache 2:

sudo service apache2 restart

But get the below error:

* Restarting web server apache2 

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1.

Set the 'ServerName' directive globally to suppress this message

I've tried to change

sudo gedit /etc/apache2/httpd.conf

A blank file appears, and I'd added this:

ServerName localhost

But that error doesn't disappear!

How can I fix this problem?

Solution 1:

I found this: How do I restart/reload Apache when it can't determine the domain name?

Good news! Apache is restarting successfully. Apache just isn't sure where you want serve from, so it's choosing your localhost (127.0.0.1) by default. To prevent this message from appearing, clarify that you want to serve from localhost (127.0.0.1) by adding the following line into your /etc/apache2/apache2.conf file:

ServerName localhost

Solution 2:

Specifying ServerName localhost in your configuration files outside of the virtual host sections is the way to do this.

Other answers suggest that you should modify /etc/apache2/httpd.conf. This file gets overwritten when apache gets upgraded from apt. For Apache configuration that you don't want to get overwritten, you should create a new file. Here is the "Debian way" to make this configuration change:

# create the configuration file in the "available" section
echo "ServerName localhost" | sudo tee /etc/apache2/conf-available/servername.conf
# enable it by creating a symlink to it from the "enabled" section
sudo a2enconf servername
# restart the server
sudo service apache2 restart