Raise scheduler/controller-manager replicas in multi-master #312
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
* Continue to ensure scheduler and controller-manager run at least two replicas to support performing kubectl edits on single-master clusters (no change) * For multi-master clusters, set scheduler / controller-manager replica count to the number of masters (e.g. a 3-master cluster previously used replicas:2, now replicas:3)
dghubble
force-pushed
the
scheduler-cm-replicas
branch
from
e8f8538
to
43fe78a
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Motivation:
kube-apiserverhas always been run as a DaemonSet across controllers to provide high availability, butschedulerandcontroller-managerwere always run with replicas 2 (sufficient to support kubectl edits of the control plane without downtime). But if a cluster is running multiple controller nodes, we might as well run a higher replica count, tending toward one per node (users are paying for the nodes either way).