Comments (7)
ravitri
commented on June 20, 2024
1
@damemi , @ingvagabund - In addition to the upgrades, the other scenarios I can think of which could possibly disrupt existing core workloads is node/machine replacements/addition/removal. For now, the worker and infra nodes are supported as part of this but in future will be extended to control plane too (subject to change). Another scenario can be a MachineConfig change to cause rolling reboot of nodes in the respective MachineConfigPool (triggered change which is not an upgrade).
Considering above scenarios as well, I think we might need to stretch openshift* namespace inclusion criteria further. WDYT?
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ingvagabund
commented on June 20, 2024
We might also introduce a new profile which will do this right before/after the upgrade if this is the only use case. Make it part of the upgrade itself (pre/post-upgrade steps).
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wking
commented on June 20, 2024
Descheduler is very polite by using the eviction API. We have efforts like openshift/origin#26160 underway to improve our PDB coverage. If folks using the eviction API can cause excessive disruption in the OpenShift core, that sounds like it's really a missing/miscongured PDB situation to me. I expect we have some bugs like that today. Hopefully openshift/origin#26160 turns them up, and we get them fixed. Once we get them fixed, can we pivot to having the descheduler cover the kube-system and openshift-* namespaces by default? Because "don't ask about evicting us, we don't handle that well" doesn't seem like a good long-term plan.
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openshift-bot
commented on June 20, 2024
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openshift-bot
commented on June 20, 2024
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openshift-bot
commented on June 20, 2024
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openshift-ci
commented on June 20, 2024
@openshift-bot: Closing this issue.
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Related Issues (20)
- "unknown conversion" with descheduler policy post-1.14 HOT 3
- Switch to actual upstream Descheduler policy HOT 5
- LowNodeUtilization "NumberOfNodes" not working HOT 4
- LowNodeUtilization: "TargetThreshold" params not translated correctly, overriden by "Threshold" values HOT 2
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- Operator should automatically exclude "openshift-*" namespaces HOT 9
- Descheduler should parse IMAGE env var for development
- Add the possibility to define nodeSelector+tolerations for the operator and KubeDeschedulers HOT 18
- Why is policy customization removed in 4.7? HOT 10
- [Release] Please prepare bundle for OCP 4.10
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- descheduler pod OOM on large clusters HOT 4
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