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How can I use grep to find the most frequently recurring errors in my log file?
I’ve got a PHP application that is generating large amounts of warnings and notices in the log file.. I’m fixing these one at a time. I would like to be able to fix the most frequently occurring first...
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Open Source Linux network analyzer
Open Source Linux network analyzer Which are there? What features do they offer? What exactly do you need? wireshark – network sniffer/analyzer iftop – bandwidth usage darkstat – traffic analyzer nmap...
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How can I calculate how much a high volume site would save with cloud...
How can I calculate the required bandwith and cost of hosting a site that would have around 3 million unique visitors per year? I wanted to come up with an estimate of how much cost could be saved by...
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Web statistics software with custom event markers?
Is there a web statistics service or software that allows inserting custom events into the graphs for quick reference? I would like to be able to insert an event like “on March 3rd, we changed the...
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Linux kernel crash dump analysis: Guidelines
Note: 2.6+ Kernel Or older 2.4 Question: Generic suggested guidelines with regards to Linux kernel crash dump analysis Skills required, i.e. Kernel compilation skills etc Suggestions: Detailed...
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Why to use a commercial packet/protocol analyzer vs. WireShark?
I have never worked in an “enterprise” infrastructure group but have been responsible for small networks. WireShark (Ethereal back in the day) always worked for me in those situations. Where is the...
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Is there a good alternative to analog for web server log analysis?
I have been using Analog to analyze the logs of our Apache web server. While analog is quite powerful, I find it quite tedious to set it up correctly to get the information that you want. My question...
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Logging employee web visits – free tracking and reporting tools
Given the appropriate security policies, disclaimers, etc. by the employer, admins typically need tools to record and report on how the internet connection is being used by its employees. In the past,...
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What is a good sendmail log analyzer?
We had a recent event where one of two servers running sendmail stopped sending mail, and built up a 7000 message queue before we noticed / fixed it. It’s fixed now, but we don’t know why it failed,...
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How to diagnose a Windows blue screen?
Sometimes I have to answer support calls responding to PC crashes with blue screens. How can I effectively narrow down the problem giving the information on that screen? What are the most important...
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