Drop support for etcd2

[spiffxp]

Feature Description

• One-line feature description (can be used as a release note): Drop support for etcd2
• Primary contact (assignee): @spiffxp
• Responsible SIGs:
  • SIG API Machinery
  • SIG Release
  • SIG Testing
• Design proposal link (community repo): n/a
• Link to e2e and/or unit tests: n/a
• Reviewer(s) - (for LGTM) recommend having 2+ reviewers (at least one from code-area OWNERS file) agreed to review. Reviewers from multiple companies preferred:
  • TBD
• Approver (likely from SIG/area to which feature belongs):
  • SIG API Machinery: @lavalamp (or whomever they would like to delegate to)
  • SIG Release: @AishSundar (or whomever they would like to delegate to)
  • SIG Testing: @spiffxp
• Feature target (which target equals to which milestone):
  • Stable release target (1.13)

Context:

• Deprecation announcement in CHANGELOG-1.10.md: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.10.md#deprecations
• kubernetes-dev thread: https://groups.google.com/d/msg/kubernetes-dev/DoOl77xjpDA/uZFun65oBwAJ
• etcd v3 as storage backend for APIServer #44 - support for etcd3 was added in 1.5, made stable in 1.6
• Consider deprecating etcd2 kubernetes#44156 - umbrella issue to deprecate/drop etcd2 (note, I feel this is now out of date, and our deprecation has not been nearly as comprehensive, we will just be dropping etcd2 support)
• master blocking jobs should probably be on etcd3 test-infra#7602 - move all testing jobs to etcd3

I'm filing this as a feature issue to raise visibility, but this is intended to more or less be a turning of the crank that was set in motion last year.

/sig api-machinery
/sig release
/sig testing

[spiffxp]

/milestone v1.13

[spiffxp]

/stage stable

[kacole2]

this has been added to the 1.13 tracking sheet. thanks!

[AishSundar]

@spiffxp should we call this /kind feature considering its scope?

[justaugustus]

Yep.
/kind feature

[justaugustus]

Also, we need a SIG Release owner for this who isn't you, Aish. I think you'll be sufficiently busy with running the release. Maybe @tpepper or @dims ?

[dims]

Happy to chip in @justaugustus @AishSundar

[liggitt]

• test jobs have been updated
• kops updated to use etcd3
• etcd2 support has been removed from the apiserver

[spiffxp]

@liggitt @wojtek-t @dims @ixdy @xiang90 following up on kubernetes/kubernetes#69310 (comment)

I think we still have some more etcd2-related code to remove:

./third_party/forked/etcd221
./third_party/forked/etcd237

These are referenced in k/k:

cluster/images/etcd/migrate/rollback_v2.go
28:	oldwal "k8s.io/kubernetes/third_party/forked/etcd221/wal"
30:	// oldwal "k8s.io/kubernetes/third_party/forked/etcd237/wal"

cluster/images/etcd/migrate/BUILD
28:        "//third_party/forked/etcd221/wal:go_default_library",

And I believe we end up publishing

gcr.io/google_containers/etcd-amd64
gcr.io/google_containers/etcd-arm
gcr.io/google_containers/etcd-arm64
gcr.io/google_containers/etcd-ppc64le
gcr.io/google_containers/etcd-s390x

[tfogo]

Hi @spiffxp! Is there anywhere in the docs we'll need to update due to this?

[AishSundar]

@spiffxp do we want to include this in docs? if so can you point us to the PR plz/

[spiffxp]

docs: kubernetes/website#11414

[luxas]

This is now done as v1.13 has been released 👍.

[marpaia]

/milestone v1.14

[marpaia]

/milestone clear