I have used SeeFusion to monitor ColdFusion requests. Is there a similar tool that would allow me to monitor Apache httpd requests in real time? We have a server that was fast and responsive for months, but suddenly today, it is using 80% cpu instead of 1%, I have no idea where to start to figure out what is bogging it down. Asked by Robert Louis Murphy Look at Apache’s mod_status: http://httpd.apache.org/docs/2.0/mod/mod_status.html Answered by KM01 [...]

Just got a new VPS with two IPs. I’m getting a tonne of requests from multiple different client IPs for a single path on one of the IPs, almost one per second. The path is “/lzb/gz.php”. Any ideas what this is? And should I be concerned? Should I request a new IP from my VPS provider, or just hope the volume dies down over time? FYI I’m running nginx as a reverse proxy to apache2. [...]

Well someone is requesting some URL’s with really strange hex codes. How can I find out what they are up to. The problem is I don’t even know what code that is, it’s not a hex code. How can I find out what’s going on here? If it’s definitely not something you’d expect for your application it is entirely possible someone is doing Something Nasty ™. Google the URL (or an interesting part of it) [...]

In order to perform realistic tests for a new backend server, I’d like to process all Apache requests twice. So simply handle all the live requests with the old server, as it’s done right now, but then also ‘duplicate’ the requests to a different virtual host, where the new backend is deployed, which will process the request and log the response. What’s the best / most simple way to achieve this in Apache? (the backend [...]

I am pretty new to the whole linux web servers so please bare with me. Is it possible to know if a php file on my server is being accessed by a user? Is there a command I can use through ssh that will list every IP addresses and which page they’re requesting? My ultimate goal is to run a cron job to exec a specific php file if it’s not already being accessed by [...]

Some DNS services offer to host your DNS for free with a limit like ’50,000 DNS queries a month’. Does each website visit trigger a lookup? What volume of traffic can be served with 50,000 requests per month? What is the time frame they are talking about? Second, Minute, Hour, Day, Month, Year? Does each website visit trigger a lookup? Yes and no. Every time someone hits your site a DNS lookup is necessary for [...]