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  1. #1
    Join Date
    Aug 2004
    Location
    Panama City, FL
    Posts
    223

    Troubleshooting a Linux-based server...

    So... I've been trying to pick up knowledge about running a server by the best means possible: running a server...

    I've picked up some m4d 5ki115 about some things, but find many gaps in my knowledge...

    When I have a problem, I turn to google, WHT, a couple of other resources... And I usually find some great help... especially here, and I'm not just trying to stroke the collective WHT ego - this really is the best website and community I've found for hosting related things...

    So when my server went unresponsive today, and I had to do a hard reboot (i.e. cut power off...) - once I got back in, I've been trying to figure out what caused the unresponsiveness...

    TOP doesn't really show anything I'm worried about, although I do have a load of .06 where I normally have more like .01-.03, but I've seen it higher... you know, when someone actually uses something on the server... heh.

    Bah. I'm talkative, sorry - what I'm trying to get at... Instead of asking for specifica ideas and help on this specific issue, I'd rather ask for pointers to some good sites that discuss things like how to tell WTF caused the server to go down (i.e. probably tutorials on where common logs are, and what some of that stuff means)..

    In other words, I'm not asking for fish, to abuse the old cliche-- I'm asking you to point me towards some websites that might help me learn how to fish...

    The sites I've found on my on and through WHT have been great - lots of tutorials that have taught me a lot I didn't know... I'm hoping I've missed some out there...

  2. #2
    Join Date
    May 2003
    Location
    Florida
    Posts
    877
    Hi. Check out http://www.eth0.us/

  3. #3
    Join Date
    Mar 2003
    Location
    Canada
    Posts
    8,910
    Quote Originally Posted by Dacsoft
    Hi. Check out http://www.eth0.us/
    http://www.eth0.us is a great resource!
    Patrick William | RACK911 Labs | Software Security Auditing
    400+ Vulnerabilities Found - Quote @ https://www.RACK911Labs.com

    www.HostingSecList.com - Security notices for the hosting community.

  4. #4
    Join Date
    Mar 2004
    Posts
    295
    /var/log/
    /var/log/messages
    use less /var/log/messages or nano it and use ctrl+w to search for something such as restart, this is the point where syslogd restarts.
    Around that point you may find what caused the crash.

  5. #5
    Join Date
    Mar 2003
    Location
    California USA
    Posts
    13,293
    what os is it?
    Steven Ciaburri | Industry's Best Server Management - Rack911.com
    Software Auditing - 400+ Vulnerabilities Found - Quote @ https://www.RACK911Labs.com
    Fully Managed Dedicated Servers (Las Vegas, New York City, & Amsterdam) (AS62710)
    FreeBSD & Linux Server Management, Security Auditing, Server Optimization, PCI Compliance

  6. #6
    Join Date
    Aug 2004
    Location
    Panama City, FL
    Posts
    223
    D'oh! I missed the reply notice for the thread... Thank you for the replies, sorry I'm just seeing this. D'oh!!

    Dacsoft: Cool resource, thanks!

    TDK-Kevin: That's one of those bits of info that's so basic, and I haven't run across it anywhere before... Awesome. Thank you.

    Wow. I've just spent a fun hour poking through system messages... That's not sarcasm, by the way...

    I spotted my restart, but there wasn't anything unusual happening anywhere previous to that (i.e. for the prior, say, 10 hours or so...)

    Steven: Fedora. Which version? Uhm........ I read somewhere that you can look in /etc/redhat-release for helpful info... well.. I have fedora-release, says "Core 2"... I'm used to seeing version numbers with more digits- you know, "Windows XP" was 5.1.2600, IIRC... Not sure how to get which precise version I'm running. heh.

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