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Questions tagged [analysis]

59 questions
29
votes
7 answers

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 questions I have to ask the user? Edit: By…
splattne
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4 answers

Debian - Port 80 is blocked, but I don't know by what

I can't make lighttpd listen to port 80. ~# /etc/init.d/lighttpd start Starting web server: lighttpd2013-03-16 23:15:02: (network.c.379) can't bind to port: 80 Address already in use failed! Actually I have apache2 installed on my server, too…
Lama
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10
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2 answers

How to determine which file/inode occupies a given sector

I received messages in /var/log/kern.log that indicate drive failure. The messages occured while copying my $HOME between drives (ext4 -> ext3): [ 5733.186033] sd 4:0:0:0: [sdb] Unhandled sense code [ 5733.186038] sd 4:0:0:0: [sdb] Result:…
krlmlr
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8
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2 answers

Tracking Apache by VirtualHost

I have an apache webserver running many VirtualHosts. Recently it has been bogging down and becoming unresponsive, and I'm wondering how I can determine which VirtualHosts are causing most of the issue. We have had occasions in the past where a bug…
Brent
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7
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2 answers

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 walk-through, of the Red Hat Crash Utility Usage…
Aaron
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6
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5 answers

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 is: Do you know any (perhaps more "modern") tools…
Palmin
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6
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1 answer

Analyze HTTP logs, looking for iOS

I am currently using AWStats to analyze the apache logs for a server that redirects links, etc from iOS apps to the app store (so we can track clickthrough). In AWStats, however, all of this traffic is grouped into 'Mac OS X' in the Operating…
zib_redlektab
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5
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3 answers

Are there useful static analysis tools for databases?

Is there a popular tool for examining the configuration and schema of a database for dubious fields, relationships and configuration, similar to how static analysis tools like lint will flag dubious lines of code? (I'm not sure that this is…
jldugger
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3 answers

How can I calculate how much a high volume site would save with cloud computing Vs. traditional hosting?

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 using a cloud computing service like Amazon EC3…
MikeN
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3 answers

"group by count" for IPs in text file in linux

I've got a huge textfile which contains IP addresses: 123.33.22.33 221.23.128.2 123.33.22.33 92.222.192.12 92.222.192.12 123.33.22.33 I can sort it to: 123.33.22.33 123.33.22.33 123.33.22.33 221.23.128.2 92.222.192.12 92.222.192.12 and see (with…
cherouvim
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11 answers

Open Source Linux network analyzer

Open Source Linux network analyzer Which are there? What features do they offer?
Martin K.
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4
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3 answers

What tool can be used to splice together log files from different sources?

I am trying to analyze a series of application requests. There are web logs, application server logs and data server logs, all with slightly different timestamps on each line. I'd like to splice them together to see the various logs in the order…
Rog
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3 answers

nfs file access statistics

For a Linux NFSv3 server, is there any way to see statistics on actual file access? In other words, I would like to see a timestamped log of every file read or written. Motivation: I have several NFS servers that are slated to be replaced by some…
Matt
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2 answers

Bayesian / learning log analyzer?

Are there any log analyzers that are using Bayesian algorithms or other learning algorithms? I found btail but the version number (0.2) doesn't give a good outlook.
raspi
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3 answers

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 line drawn on when to crossover? Or is it?
squillman
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