Re: Apache cluster?

From: Chris St. Pierre (stpierre_at_NebrWesleyan.edu)
Date: 11/18/05

  • Next message: Magnus Andersen: "Re: Apache cluster?" 
    Date: Fri, 18 Nov 2005 13:12:26 -0600 (CST)
To: General Red Hat Linux discussion list <redhat-list@redhat.com>

    GFS is kind of overkill if there's no dynamic content, and I've not
    heard good things about its stability, either.

    By "dynamic content," I mean anything like a database backend. The
    setup I described below depends on the web servers never needing to
    alter the content they serve. If users can add content -- comments,
    orders, anything -- then you'll need a writable mount, in which case
    you'll need to look into MySQL Cluster, Oracle RAC, or something like
    that.

    To do a DNS round-robin, I think you'd just create an alias to both
    boxes, something like this:

    box1 IN A 192.168.0.1
    box2 IN A 192.168.0.2
    www IN CNAME box1.example.com
    www IN CNAME box2.example.com

    _I THINK_. Check with your local DNS/Bind expert first. :)

    Chris St. Pierre
    Unix Systems Administrator
    Nebraska Wesleyan University

    On Fri, 18 Nov 2005, Dominik Schmid wrote:

    > Have a look at gfs from redhat:
    > http://www.redhat.com/en_us/USA/home/solutions/gfs/
    >
    >> Chris,
    >>
    >> What do you consider dynamic content? And how do I do a DNS round-robin?
    >>
    >> Thanks,
    >> Magnus
    >>
    >> On 11/18/05, Chris St. Pierre <stpierre@nebrwesleyan.edu> wrote:
    >>
    >>
    >> >Magnus--
    >> >
    >> >If you've only got apache running, with no dynamic content, you can
    >> >try mounting the MSA500 read-only on both boxes and do a DNS
    >> >round-robin between them. That'll get you load balancing. For
    >> >failover, look into Linux-HA; this would be a really simple setup,
    >> >because the heartbeat would just need to bring up a virtual interface
    >> >on the box that remains alive.
    >> >
    >> >If you have dynamic content, then it becomes orders of magnitude more
    >> >difficult because you can't (or can, but don't want to) mount the same
    >> >block device by two different boxes _except_ as read-only.
    >> >
    >> >Chris St. Pierre
    >> >Unix Systems Administrator
    >> >Nebraska Wesleyan University
    >> >
    >> >On Fri, 18 Nov 2005, Magnus Andersen wrote:
    >> >
    >> >
    >> >
    >> > >Hi All,
    >> > >
    >> > >I have 2 HP DL380s and a MSA500 array that I would like to set up in a
    >> > >clustered configuration. I want the cluster to be acting both load
    >> > >
    >> > >
    >> >balancing
    >> >
    >> >
    >> > >and failover for Apache. I looked into RH Cluster Suite, but it looks to
    >> > >
    >> > >
    >> >me
    >> >
    >> >
    >> > >like I have to have an additional couple of servers to make it load
    >> > >
    >> > >
    >> >balance.
    >> >
    >> >
    >> > >Have anyone done this or know of some software that will do it?
    >> > >
    >> > >Thanks,
    >> > >
    >> > >--
    >> > >Magnus Andersen
    >> > >Systems Administrator / Oracle DBA
    >> > >Walker & Associates, Inc.
    >> > >--
    >> > >redhat-list mailing list
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    >>
    >>
    >> --
    >> Magnus Andersen
    >> Systems Administrator / Oracle DBA
    >> Walker & Associates, Inc.
    >>
    >>
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