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Thread: is this normal?

  1. #1
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    is this normal?

    I have a website that is really popular pretty recently. The server keeps crashing and then not coming back up. I have SIM that reboots the machine when it hits a load of 45.

    My server will go down and be down for the whole day... No matter how many time I get my datacenter to reboot, it'll be down all day.

    The server is a dual core opteron 170 with 2 gigs of ram. Maybe the server cant handle the load but is it normal that the server would just stop working all day?
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  2. #2
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    I think it may be a DDOS attack. How many connections per IP is normal?
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  3. #3
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    Is this normal? Definitely not.
    Have you made any changes to the site, recently? What type of site are you running? MySQL?
    It certainly shouldn't take all day to reboot your server.
    Have you addressed this with your DC techs? Have you had your admin look at this?
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  4. #4
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    That admins took a look at it and said to watch: netstat -plan | grep :80 | awk '{print $5}' | cut -d: -f 1| sort | uniq -c | sort -n

    As they think it may be a DDOS attack. I notice nothing too bad. (5) connections from one ip - 10 connections.

    They also said it might be bad RAM, and they're checking into it.
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  5. #5
    Have you checked the logs? Start with /var/log/messages
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  6. #6
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    What is the load like when it crashes? Also what does just

    netstat -anpl |grep :80 |wc -l

    show? That will show the total number of web connections, it still may be a DDOS if it is lots of ips with a few connections.

    The other possibility is the hardware, hopefully they will run memtester/badblocks/etc to see if the hardware is bad. As SJR said check /var/log/messages and see if you get any errors.

    Finally look in top and see if the load is perhaps IOwait or if not what is causing it.
    John W, CISSP, C|EH
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  7. #7
    It could be hardware failure.
    I would advise to check the log.
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  8. #8
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    I know it may sound silly, but every time the server crashes, is it the same legnth of time that it has been on? I would then suspect a bad or intermitten shortting power supply. (yes i've seen it happen before)

  9. #9
    what about your dns... make sure it is ok..

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