Wednesday, 2021-01-20

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kklimonda_magnum provides a way to upgrade kubernetes version, but what about OS releases? from documentation, for fedora atomic it was possible to use ostree_* labels to upgrade nodes, but I don't see anything similar for fedora coreos, and upgrading cluster using a template with different image doesn't seem to be rebuilding/replacing servers10:51
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kklimonda_ok, so this actually mostly works with fedora coreos (modulo uncordon service)11:54
kklimonda_well, ostree_* method as opposed to server rebuild/replace11:54
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kklimonda_so I have a follow-up question: documentation mentions that simple upgrades using new image are supported, but the commit that adds this documentation does not actually seem to be adding support for replacing images in heat stack13:11
kklimonda_this doesn't let me cordon and drain nodes before instance is rebuilt using new image apparently, so the ostree_* seems to be a cleaner approach.. but that will leave me with old images that can't really be deleted because some instances still use them (even though they've been upgraded to newer image internally)13:16
kklimonda_that also doesn't handle resizing cluster, and new nodes are left with old system version (because they were spawned from old image, and rpm-ostree/reboot is not part of the installation process)13:17
kklimonda_is there any discussion regarding how to proceed with that feature forward? is rebuild limitation inherent to heat and something that can't be fixed? if so, is there a consensus that "in-place" upgrades are the way forward, and it's guaranteed that instances won't be rebuilt in the future? Then what's left is some work to upgrade system during resizing and reboot the instance.13:20
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