Improve apiserver backend service zone spanning on GCP #504
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
dghubble
changed the title
* google_compute_backend_services use nested blocks to define backends (instance groups heterogeneous controllers) * Use Terraform v0.12.x dynamic blocks so the apiserver backend service can refer to (up to zone-many) controller instance groups * Previously, with Terraform v0.11.x, the apiserver backend service had to list a fixed set of backends to span controller nodes across zones in multi-controller setups. 3 backends were used because each GCP region offered at least 3 zones. Single-controller clusters had the cosmetic ugliness of unused instance groups * Allow controllers to span more than 3 zones if avilable in a region (e.g. currently only us-central1, with 4 zones) Related: * https://www.terraform.io/docs/providers/google/r/compute_backend_service.html * https://www.terraform.io/docs/configuration/expressions.html#dynamic-blocks
dghubble
force-pushed
the
improve-gcp-zone-spanning
branch
from
bd0116f to
3fcb04f
Compare
dghubble
added a commit
that referenced
this pull request
Jul 20, 2019
* Intended as part of #504 improvement * Single controller clusters only require one controller instance group (previously created zone-many) * Multi-controller clusters must "wrap" controllers over zonal heterogeneous instance groups. For example, 5 controllers over 3 zones (no change)
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Outdated suggestions cannot be applied.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.
GCP region offered at least 3 zones. Single-controller clusters had the cosmetic ugliness of unused instance groups
Related: