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Thread: HA limitations?

  1. Question HA limitations?

    Hi, are there any limitation of using SLES for Vmware and HA extension?

    Situation would be:

    - two Sles for vmware Apache servers in active passive HA configuration
    - hosting on multi node ESXi cluster

    One machine will be mainly locked on 4 nodes of primary site, second on 4 nodes of secondary site, but I need possibility to move nodes all over ESXi cluster (drs) without downtime.

    HA Apache cluster should be possible to automatically switch to second node in case of first node failure.

    Is this possible?

    thanks

  2. #2

    Re:HA limitations?

    klemenvi Wrote in message:

    > Hi, are there any limitation of using SLES for Vmware and HA extension?
    >
    > Situation would be:
    >
    > - two Sles for vmware Apache servers in active passive HA configuration
    > - hosting on multi node ESXi cluster
    >
    > One machine will be mainly locked on 4 nodes of primary site, second on
    > 4 nodes of secondary site, but I need possibility to move nodes all over
    > ESXi cluster (drs) without downtime.
    >
    > HA Apache cluster should be possible to automatically switch to second
    > node in case of first node failure.
    >
    > Is this possible?


    I was originally going to say that I didn't think the SUSE Linux
    Enterprise (SLE) High Availability Extension (HAE) was compatible
    with SLES for VMware but after a bit of research now I'm not so
    sure as scripts for monitoring VMware are included[1].

    There is an interesting question about support however since SLE
    HAE is supported by SUSE whilst SLES for VMware is supported by
    VMware.

    HTH.

    [1] https://www.suse.com/products/highav...eatures/flexib
    le_policy-driven_clustering.html
    --
    Simon
    SUSE Knowledge Partner

    ----Android NewsGroup Reader----
    http://www.piaohong.tk/newsgroup

  3. Re: HA limitations?

    Quote Originally Posted by smflood View Post
    klemenvi Wrote in message:

    > Hi, are there any limitation of using SLES for Vmware and HA extension?
    >
    > Situation would be:
    >
    > - two Sles for vmware Apache servers in active passive HA configuration
    > - hosting on multi node ESXi cluster
    >
    > One machine will be mainly locked on 4 nodes of primary site, second on
    > 4 nodes of secondary site, but I need possibility to move nodes all over
    > ESXi cluster (drs) without downtime.
    >
    > HA Apache cluster should be possible to automatically switch to second
    > node in case of first node failure.
    >
    > Is this possible?


    I was originally going to say that I didn't think the SUSE Linux
    Enterprise (SLE) High Availability Extension (HAE) was compatible
    with SLES for VMware but after a bit of research now I'm not so
    sure as scripts for monitoring VMware are included[1].

    There is an interesting question about support however since SLE
    HAE is supported by SUSE whilst SLES for VMware is supported by
    VMware.

    HTH.

    [1] https://www.suse.com/products/highav...eatures/flexib
    le_policy-driven_clustering.html
    --
    Simon
    SUSE Knowledge Partner

    ----Android NewsGroup Reader----
    http://www.piaohong.tk/newsgroup
    If you think that SLESforVMware can be a problem I can use standard SLES. Have you seen or even more such scenario in production?

    thanks

  4. #4
    David Gersic NNTP User

    Re: HA limitations?

    On Sat, 14 Dec 2013 13:04:01 +0000, klemenvi wrote:

    > Hi, are there any limitation of using SLES for Vmware and HA extension?


    None that I know of. I'm not sure what the point is of using SLES/HAE and
    VMWare, though.


    > Situation would be:
    >
    > - two Sles for vmware Apache servers in active passive HA configuration
    > - hosting on multi node ESXi cluster
    >
    > One machine will be mainly locked on 4 nodes of primary site, second on
    > 4 nodes of secondary site, but I need possibility to move nodes all over
    > ESXi cluster (drs) without downtime.


    Wouldn't this be handled by VMWare?


    --
    --------------------------------------------------------------------------
    David Gersic dgersic_@_niu.edu
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  5. Re: HA limitations?

    If I have two Apache servers in HA, I can manage (software patching...) inactive node, then switch (without down time) and manage first node...
    If my primary site failed it will automatically switch to node on other site (without down time)...


    What do you recommend for high available Apache cluster in virtual environment?

  6. Re: HA limitations?

    Hi klemenvi,
    Quote Originally Posted by klemenvi View Post
    What do you recommend for high available Apache cluster in virtual environment?
    how about an active/active Apache cluster (in terms of "running on separate VMs", but no special cluster management to relocate httpd) with some load-sharing front-end, i.e. iptables' cluster module?

    Seems like much less hassle than creating a complete HA setup.

    Regards,
    Jens
    From the times when today's "old school" was "new school"

    If you find this post helpful and are logged into the web interface, show your appreciation and click on the star below...

  7. #7
    David Gersic NNTP User

    Re: HA limitations?

    On Mon, 16 Dec 2013 19:04:01 +0000, klemenvi wrote:

    > If I have two Apache servers in HA, I can manage (software patching...)
    > inactive node, then switch (without down time) and manage first node...


    Sure, that makes sense.


    > If my primary site failed it will automatically switch to node on other
    > site (without down time)...


    You could do this in SLES/HAE with the relatively new multi-site support.
    Or you could do it at the VM level, using VMWare's tools.


    > What do you recommend for high available Apache cluster in virtual
    > environment?


    SLES/HAE doesn't really know or care if it's running on physical or
    virtual hosts. VMs and HA are different tools that can both solve many
    similar problems.



    --
    --------------------------------------------------------------------------
    David Gersic dgersic_@_niu.edu
    Knowledge Partner http://forums.netiq.com

    Please post questions in the forums. No support provided via email.
    If you find this post helpful, please click on the star below.

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