How do I see which web server software I'm running?

Linode Staff

I have a website running but I'm not sure which web server software is being used. How can I find out?

1 Reply

You can start by seeing which process is listening on the common web ports (80 and 443) using the command ss and filtering the results with grep:

ss -plunt | grep ':80\|:443'

Here's how the output of that command looks like on a Linode that is running Apache on ports 80 and 443:

[email protected]:~# ss -plunt | grep ':80\|:443'
tcp     LISTEN   0        128                    *:443                 *:*       users:(("apache2",pid=32035,fd=6),("apache2",pid=32034,fd=6),("apache2",pid=32033,fd=6),("apache2",pid=32032,fd=6),("apache2",pid=32024,fd=6),("apache2",pid=32022,fd=6),("apache2",pid=32014,fd=6),("apache2",pid=31992,fd=6),("apache2",pid=31991,fd=6),("apache2",pid=31979,fd=6),("apache2",pid=16365,fd=6))
tcp     LISTEN   0        128                    *:80                  *:*       users:(("apache2",pid=32035,fd=4),("apache2",pid=32034,fd=4),("apache2",pid=32033,fd=4),("apache2",pid=32032,fd=4),("apache2",pid=32024,fd=4),("apache2",pid=32022,fd=4),("apache2",pid=32014,fd=4),("apache2",pid=31992,fd=4),("apache2",pid=31991,fd=4),("apache2",pid=31979,fd=4),("apache2",pid=16365,fd=4))

To see which version of Apache is being used, run:

apache2 -v

Note that in some systems, Apache runs as "httpd". In that case, to find out the version you can run:

httpd -v

If the web server is Nginx, run the following command to get its version:

nginx -v

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