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Hi all, I have a few high level questions with regards to this setup and i hope you gurus can enlightened me. I have 2 nodes (A and B). With ...
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  1. #1
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    Linux HA clustering


    Hi all,

    I have a few high level questions with regards to this setup and i hope you gurus can enlightened me.

    I have 2 nodes (A and B).

    With Linux HA,

    q1) Do i still need to sync data/applications between this 2 nodes or will it be sync automatically ?

    e.g i got an app (myprog) running in background, if node A fail, node B will takeover by starting the app (myprog) on node B itself, but myprog must 1st exists in node B isn'it it ?

    q2) I believe HA depends heavily on the heartbeat daemon, so therefore, if these related processes went down, won't my HA fail ?

    where is these daemons installed ? on both node A and B ?

    q3) I have read about certain apps would still need to be manually restarted or configured in a HA environment (warm standby)

    I can't really picture out what kind of apps would require so in a HA environment ? (database?)

    From what i see, if i have 2 sets of similar apps on both A and B, if A goes down, the apps will be start on B and that's it. (why would it still need any manual intervention ?)

    Regards,
    Noob

  2. #2
    Linux Guru Lakshmipathi's Avatar
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    Whats the software you are using to achieve HA?If you haven't decided on it checkout GlusterFS - AFR setup.

    HTH
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  3. #3
    Linux Newbie
    Join Date
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    Quote Originally Posted by javanoob View Post
    Hi all,

    I have a few high level questions with regards to this setup and i hope you gurus can enlightened me.

    I have 2 nodes (A and B).

    With Linux HA,

    q1) Do i still need to sync data/applications between this 2 nodes or will it be sync automatically ?

    e.g i got an app (myprog) running in background, if node A fail, node B will takeover by starting the app (myprog) on node B itself, but myprog must 1st exists in node B isn'it it ?

    q2) I believe HA depends heavily on the heartbeat daemon, so therefore, if these related processes went down, won't my HA fail ?

    where is these daemons installed ? on both node A and B ?

    q3) I have read about certain apps would still need to be manually restarted or configured in a HA environment (warm standby)

    I can't really picture out what kind of apps would require so in a HA environment ? (database?)

    From what i see, if i have 2 sets of similar apps on both A and B, if A goes down, the apps will be start on B and that's it. (why would it still need any manual intervention ?)

    Regards,
    Noob
    I would suggest that you have a look at this guide to get an idea of a practical example of Linux HA.

    I didn't write it by the way, but I did help with some of the (poor) load testing.

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