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1 .SIG Release: Deep Dive - LTS
Tim Pepper (VMware) - SIG chair; 1.12 release lead
2 .Agenda
● Brief overview of the Kubernetes
○ release process
○ release lifecycle
● Impacts of process/lifecycle on Kubernetes vendors,
distributors, and hosted service providers
● Discussion
3 .Release Process
Feature Discussion (per SIG): ongoing
Feature
Feature Freeze: week ~4 Definition
Feature 3 Month
Release Branch Creation: week ~7 Work Cycle
Code Slush / Freeze: week ~8
...bugs, testing, bugs, fixing, bugs, ...iterating Bug
Fixing
End Code Freeze: week ~12
Release: week ~13 Release
4 .Release Process
Feature Discussion (per SIG): ongoing Enhancements
Enhancements Feature
Feature Freeze: week ~4 Definition
3 Month
Release Branch Creation: week ~7 Coding
Cycle
Code Slush / Freeze: week ~8
...bugs, testing, bugs, fixing, bugs, ...iterating Bug
Fixing
End Code Freeze: week ~12
Release: week ~13 Release
5 . Release Lifecycle
ec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov De
3mo’s ~9mo’s
Feature Bug
Feature
Definition Work Fixing
1.10 1.10.x Patch Releases
K8S
Releases
6 . Release Lifecycle
ec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov De
3mo’s ~9mo’s
Feature Bug
Feature
Definition Work Fixing
1.10 1.10.x Patch Releases
3mo’s ~9mo’s
Feature Bug
Feature
Definition Work Fixing
1.11 1.11.x Patch Releases
K8S
Releases
7 . Release Lifecycle
ec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov De
3mo’s ~9mo’s
Feature Bug
Feature
Definition Work Fixing
1.10 1.10.x Patch Releases
3mo’s ~9mo’s
Feature Bug
Feature
Definition Work Fixing
1.11 1.11.x Patch Releases
3mo’s ~9mo’s
Feature Feature Bug
1.12
1.12.x Patch
K8s Definition Work Fixing
Releases
8 . Release Lifecycle
ec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov De
3mo’s ~9mo’s
Feature Bug
Feature
Definition Work Fixing
1.10 1.10.x Patch Releases
3mo’s ~9mo’s
Feature Bug
Feature
Definition Work Fixing
1.11 1.11.x Patch Releases
3mo’s ~9mo’s
Feature Feature Bug
1.12
1.12.x Patch
K8S Definition Work Fixing
3mo’s
Releases Feature
Definition
Feature
Work
Bug
Fixing
1.13
9 .Release Lifecycle
● Support: backporting critical fixes to a release branch
● 3 releases get support:
○ Latest stable is 1.12
○ ...therefore patch support today is for 1.12, 1.11, 1.10
● Yields approximately 9 months of support
● Must plan upgrades every 3-6 months
10 .What is LTS
● LTS == Long Term Support
● A documented support policy
● Identifies the length and type of support for releases, for example:
○ “security and bug fixes for 2 years”, or
○ “bug fixes for 1 year plus critical security fixes for 1 additional year”
● “Long” is typically > 1 year
○ Short Term Support (STS) streams are usually also present
○ “Short” is typically measured in months
11 .Possible benefits of LTS
● Users: longer production deployment, more time to transition onto and off of
a stable release, better cross-release compatibility
● Vendors: centralized, subject matter expert led bug and security fixes happen
once in upstream, instead of in parallel at each vendor
● Developers: added test coverage give early visibility to compatibility issues
12 .Possible risks, costs of LTS
● Human staffing
● Test matrix growth
● Added technical complexity of
○ Insuring API stability over longer timespans
○ Upgrading between more distant releases
13 .WG LTS Goals
● Collect stakeholder feedback, requirements on support
● Gauge stakeholder willingness and ability to commit sufficient
dev/maintenance resources expand support
● Establish:
○ Entry criteria to define a first release as LTS
○ Cadence, eg: one LTS per year
○ Support lifetime, eg: N months per LTS
○ Upgrade path, eg: from LTS N to LTS N+1
● Draft an LTS KEP and if deemed feasible…
return implementable LTS KEP to SIG Release to operationalize
14 .Many Vendors
Vendors 78 A vendor is an organization providing a Kubernetes distribution,
Products 89 hosted platform, or installer
Hosted Platforms 32
Distributions 49 A product is a distribution, hosted platform, or installer provided by
a vendor.
Certified Vendors 74
Certified Products 84 A distribution is software based on Kubernetes that can be
Certified Distributions 49 installed by an end user on to a public cloud or bare metal and
Certified Hosted 28 includes patches, additional software, or both.
Certified Installer 8
A hosted platform is a Kubernetes service provided and managed
1.7 Certifications 26 by a vendor.
1.8 Certifications 41
1.9 Certifications 42 An installer downloads and then installs vanilla upstream
1.10 Certifications 54 Kubernetes.
1.11 Certifications 43
1.12 Certifications 11
https://docs.google.com/spreadsheets/d/1LxSqBzjOxfGx3cmtZ4EbB_BGCxT_wlxW_xgHVVa23es/edit#gid=0
15 .Many Vendors in Asia
Baidu inwinStack
BoCloud JD.com
Caicloud Netease
CStack Qiniu
DaoCloud Tencent
eBaoTech TenxCloud
Hainan eKing Technology Wise2c
HarmonyCloud Woqutech
Huawei ZTE
Inspur
16 .Feedback Wanted
Is Kubernetes releasing too fast? Too slow?
Do we end-of-life releases too fast? Too slow?
What slows you from updating from 1.x to 1.(x+1)?
How much staffing do vendors have for internal patch support?
Vendors are stronger together on stable patch support (LTS)?
Can we improve cross-release and cross-vendor compatibility?
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