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  • Robert Stigsson 47 posts 158 karma points
    May 18, 2016 @ 12:07
    Robert Stigsson
    0

    Azure + Umbraco + Slot Swapping and Auto Scale

    Hi!

    I'm pretty sure I've read something about this before, but I really can't find anything about it.

    This is our procedure when updating:

    • Deploy to the Swap-slot
    • Swap the deployment slot with the production slot

    The problem is that after we swapped, the application takes extremly long time until it works "normal" again (20-30 minutes). After the swap we can see that ApplicationStart is called, and Umbraco indexes up everything from the beginning. Are there any better ways to do this?

    The same problem (ApplicationStart) is happening when we start a new instance. So when the site is slow and we auto-scale another instance, it takes 20-30 minutes before it even helps the site. Are there any good ways to solve this problem?

    Best regards,

    Robert

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  • Jason Elkin 38 posts 351 karma points MVP 3x c-trib
    May 18, 2016 @ 23:08
    Jason Elkin
    0

    Hi Robert,

    I think that Azure's auto swap feature can be configured to "warm up" the site before sending traffic to it.

    https://azure.microsoft.com/en-gb/documentation/articles/web-sites-staged-publishing/#configure-auto-swap-for-your-web-app

    20 minutes for startup is pretty extreme. I presume that CPU is at 100% during that time - have you done any tracing to see what's taking so long?

    Jas

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