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