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In-Depth Followup to the cPanel/WHM Admin Essentials 30-Minute Webinar

Discussion in 'cPanel Announcements' started by cPanelDavidG, Sep 13, 2010.

  1. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    We understand you may have questions that cannot be swiftly answered in just a minute during the Question and Answer session of the cPanel/WHM Admin Essentials 30-Minute Webinar. This forum thread is a venue where you can ask longer, more in-depth questions.
     
    #1 cPanelDavidG, Sep 13, 2010
  2. daniel_onnet

    daniel_onnet Registered

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    server load troubleshoot using sysstat


    If it's allright with you, I'll break this out into it's own thread and respond to this in a day or so; it's a pretty in-depth question (and a good one). Thanks!
     
    #2 daniel_onnet, Sep 15, 2010
    Last edited by a moderator: Sep 15, 2010
  3. free-admin

    free-admin Member

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    Os

    The best OS for you to use is the one you are most comfortable with. If you're very familiar with FreeBSD, then by all means use that. If you're more familiar with Linux, then it's probably your best choice. With that said, Linux (CentOS/RedHat) seems to be the most popular platform with cPanel/WHM, so that may factor into your decision (the more people that run software with a particular configuration, the larger your peer support pool).
     
    #3 free-admin, Sep 15, 2010
  4. Datcrack

    Datcrack Well-Known Member

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    How can we limit PHP Memory usage. Some scripts create a loop and eat up servers memory which causes swap and eventually high server load.
     
    #4 Datcrack, Sep 15, 2010
  5. BWS

    BWS Active Member

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    I've had some in-depth discussions this week about using cloudlinux (cloudlinux.com) to limit resources on a per account basis (almost like a VPS but at a cPanel account level). Is this recommended or do you have any views on it?

    Specifically this would be to stop one users processes overloading the system?
     
    #5 BWS, Sep 15, 2010
  6. Alejandro P

    Alejandro P Well-Known Member

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    Regarding a high WA, would spread accounts on additional disk reduce the server load?
     
    #6 Alejandro P, Sep 15, 2010
  7. agudiel

    agudiel Member

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    CPanel users

    Is there a way to create a limited CPanel user, with access only to email and ftp accounts but not to databases and content?
     
    #7 agudiel, Sep 15, 2010
    Last edited: Sep 15, 2010
  8. agudiel

    agudiel Member

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    I would suggest checking this on WHM:
    Main >> Service Configuration >> PHP Configuration Editor
    - max_execution_time and memory_limit
     
    #8 agudiel, Sep 15, 2010
  9. Metro2

    Metro2 Well-Known Member

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    IO Wait issues with user backups while WHM is running nightly backup

    In the webinar you mentioned I/O waits are one of the bigger issues in performance, and that's in the neighborhood of my question / concern.

    I have disabled (hidden) the Backup and Backup Wizard icons in all customer cPanels because of the fact that I have WHM set to run a nightly backup (to secondary hard drive in each server), and I'm concerned about users deciding to run their own Backup from cPanel at the same time that WHM nightly backups are already running from main disk to second disk.

    Obviously the nightly backup puts forth I/O load spike during that time all by itself, so the main question for me is:

    How safe is it to re-enable the Backup icons in cPanel for my customers, knowing that some of them with large accounts will tend to run their own Backup from cPanel at the same time while WHM is running it's nightly backups of their account at the same time?

    My secondary question to that would be; if I do enable to Backup icons and a large account user decides to run a full backup of their account while WHM is already in the process of backing up their account to the second drive, does WHM/cPanel already know how to intuitively balance that out or can that scenario cause a potential serious problem (in addition I/O "spike and crawl") , or is there a better way to avoid the clash between the two?

    I'm really sorry for the long question but I don't know how to put it into better words.

    Thanks for the Webinar this morning, greatly appreciated!
     
    #9 Metro2, Sep 15, 2010
  10. Mario-cPanel

    Mario-cPanel Administrator
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    Keep the questions coming

    We appreciate all the questions that are coming in, we will also be posting the recording of the webinar along with presentation slides to the webinar section

    We will be working on getting through your questions asap, keep the questions coming in.
     
    #10 Mario-cPanel, Sep 15, 2010
  11. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    PHP offers a means of limiting how much memory can be consumed via the memory_limit setting that can be accessed via WHM's PHP Configuration Editor (WHM -> Service Configuration -> PHP Configuration Editor). This is defaulted to 32M.
     
    #11 cPanelDavidG, Sep 15, 2010
  12. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    At this time, we do not yet support CloudLinux (a CentOS-based distribution). You can view a list of supported distros at System Requirements - cPanel Inc. - as a result, we do not currently recommend CloudLinux. However, many of our customers do use CloudLinux, including its ability to limit a user's ability to consume server resources, successfully with cPanel/WHM.
     
    #12 cPanelDavidG, Sep 15, 2010
  13. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    High WA essentially reflects that processes are waiting to use some Input/Output (IO) resource. Almost always on a web hosting server this will be the Hard Disk, the slowest IO resource on a contemporary server.

    There are scenarios where spreading accounts across multiple disks would reduce IO wait, and others where it would not. This is why analysis of the processes or scripts causing the high IO wait is important.

    For example, if there are many scripts reading a flat-file database contained within their home directory, then having multiple home mount points across multiple physical hard disks can reduce load caused by IO wait since you're essentially spreading the IO requests across multiple physical disks.

    However, if IO wait is being caused by reading data from a centralized resource like the Mailman archives on /usr or MySQL databases on /var, then having multiple home mount points does nothing to alleviate the situation since the IO wait is not being caused by anything reading from or writing to the home mount points.
     
    #13 cPanelDavidG, Sep 15, 2010
  14. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    You can remove functionality of the cPanel interface from specific cPanel users by using Feature Manager. First, go to WHM -> Packages -> Feature Manager and create a new "Feature List." Then edit your Feature List, unchecking anything you do not want to offer (e.g. the MySQL icons). You can then apply this to an existing hosting package by editing it, or create a new hosting package and setting the "Feature List" setting for that package to be the Feature List you created. You would then assign this package to the cPanel user.

    The WHM interface does not provide a means of assigning a Feature List directly to a cPanel user, that is why the Feature List must be assigned to a Package, then a Package assigned to that user.
     
    #14 cPanelDavidG, Sep 15, 2010
  15. daniel_onnet

    daniel_onnet Registered

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    I am fine by it. Go ahead. However, please advice the new thread and where to find it in this forum as I am new here. Thanks.
     
    #15 daniel_onnet, Sep 16, 2010
  16. alankru

    alankru Member

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    Please could you tell me when the recording of this webinar will be available? I missed it unfortunately, but I really want to catch up on this topic.

    Thanks!
     
    #16 alankru, Sep 29, 2010
  17. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    You can watch the webinar via: http://go.cpanel.net/adminessentials
     
    #17 cPanelDavidG, Sep 29, 2010
  18. agudiel

    agudiel Member

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    Hi,

    I just found a BUG in this option. When I remove features like phpMyAdmin, the Icon for phpMyAdmin disapears from the account's C-Panel but if you know the path (3rdparty/phpMyAdmin/index.php) you can access it anyway. How can I make sure it's safe to use the features option to remove access to certain features for an account?

    Tnx.
     
    #18 agudiel, Nov 2, 2010
  19. cPanelDavidG

    cPanelDavidG Technical Product Specialist

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    Are there any features that do not have a path of 3rdparty/ (phpMyAdmin and phpPgAdmin have this) that you are able to reproduce this on?

    I have filed a report on 3rdparty/ since I was able to reproduce that issue, but not for cPanel features that do not rely on 3rd party apps.
     
    #19 cPanelDavidG, Nov 3, 2010
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