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  1. #1
    Just Joined!
    Join Date
    Sep 2006
    Hyderabad, Pakistan

    Web Server Cluster

    I need to build a 3 node web server cluster to run a php application.
    Since the app requires users to login (which means a session state is to be maintained), I will be sharing sessions save path, I also need to share the application directory across 3 nodes.

    I having trouble deciding which cluster file system to select. Can anyone guide me here?

  2. #2
    Trusted Penguin Irithori's Avatar
    Join Date
    May 2009
    There is no need for a shared filesystem.
    In fact, this might be a SPOF in itself and will probably not scale too well.

    For a first step, you just need to make sure, that a user always connects to the same backend node.
    BalanceNG: The Software Load Balancer can do that via session persistence.

    As long as all nodes are up (and that hopefully means: a user always gets the same node), all is well.

    A step further is to use e.g. memcache for session storing:
    Enhance PHP session management

    You probably want to add at least two memcache servers and a adjusted timeout interval, etc to the session.save_path

    If you need something a little smarter than memcache, have a look at Redis

    And of course, it would make sense that balanceng is redundant.
    You must always face the curtain with a bow.

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