Helm 3: Navigating to Distant Shores (KubeCon EU 2019)

@bridgetkromhout @jldeen#kubecon@bridgetkromhout @jldeen#kubecon
Helm 3
to Distant Shores
Navigating

Bridget Kromhout Jessica Deen

Outline
1.why Helm?
2.v3 overview
3.breaking changes
4.new features
5.what’s next?

Spoilers
1.why Helm?
2.v3 overview
3.breaking changes
4.new features
5.what’s next?

consistent development repeatable deployment
containers solve problems

containers solve problemsdon’t
all

containers need orchestrating

“Kubernetes is an open-source
platform designed to automate
deploying, scaling, and operating
application containers."
Initial release: 7 June 2014
enter: k8s

Image credit: James Ernest
managing your apps

Find, share, and use software built for k8s
Manage complexity Easy updates
Simple sharing Rollbacks

Manage complexity
Charts can describe complex apps;
provide repeatable app installs, and
serve as a single point of authority

Easy updates
Take the pain out of updates with
in-place upgrades and custom hooks

Simple sharing
Charts are easy to version, share,
and host on public or private servers

Rollbacks
Use helm rollback to roll back to an
older version of a release with ease

v3 overview
- based on community best practices
- dramatic simplification
- architectural changes (security as priority)

Simpler, more secure, production use cases

Major refactor needed
Helm is almost as old as k8s
Predating CRDs and k8s RBAC!

Replacing custom APIs for charts and deployments
with secrets
making Helm more k8s-native

Inheriting security controls from kubeconfig
Using k8s RBAC to limit access & resources

Farewell, Tiller
- simpler & more flexible architecture, security, &
upgrades
- now using Kubernetes API directly
- rendering Charts client-side; storing in release
- lowering the barrier of entry for contributors

CLI changes
helm delete ——-> helm uninstall
helm inspect ——-> helm show
helm fetch ——-> helm pull
--purge is now default (to override: helm uninstall --
keep-history)

Warning! Breaking Changes!
(see https://github.com/helm/helm/blob/master/
CONTRIBUTING.md#semantic-versioning for
context)

Namespaces changes
- defaulting to a single namespace for a release
and objects (no longer using the tiller namespace)
- creating resources in the same namespace as the
release
- this is why you can’t upgrade a helm 2 release
with helm 3 (migration story is in progress!)

Chart dependency management
- Old style: requirements.yaml and requirements.lock
- New style: Chart.yaml and Chart.lock
(breaking change if you use helm dependency
subcommands)

--generate-name
- Old style: auto-generated unless overridden
- New style: error unless auto-generation requested

Adventure! Excitement! Features!

- iterating on Helm Chart Repository API
- working towards compat with OCI standard
(eventually: pluggable auth! novel artifact types!
host on ACR!)

Lua, in lieu of go templates (optionally)
Helm 2: late-binding error from k8s with a failed
release.
Helm 3: “Can I actually create these resources?”
could have a pre-install hook, see if “can I?” is true
or “Do these CRDs exist? If yes, don’t create
them.”

Library chart support
- shared by other charts
- does not create any release artifacts of its own
- A library chart’s templates can only
declare define elements
- allows simpler code reuse

@bridgetkromhout @jldeen#kubecon@bridgetkromhout #kubecon
Demo time!

the future
“What’s next?”
Jed Bartlet, The West Wing

Helm 3 alpha releases
alpha.1: tillerless, library charts, secrets storage
backend, beginning OCI groundwork (chart
commands)
alpha.2: Lua, XDG, start OCI integration (package,
install, dependency update)
alpha.3: refactoring upgrade logic (maybe with
server-side apply, 3-way diffs, etc), plugins written
in Lua

get involved!
- deep dive at 16:45 today in Hall 8.0 D4
- https://v3.helm.sh/docs/faq/
- helm.sh for community calls
- feedback on the alpha release (on new use
cases & workflows)

CFP till 31 May!
11-12 September 2019, in Amsterdam
https://helm.sh/blog/helm-summit-eu-2019/

To learn more…
Cloud Native Tooling
deislabs.io
Demo code
github.com/jldeen/helm3-demo
AKS docs
docs.microsoft.com/azure/aks
Microsoft Learn
aka.ms/k8slearning

Cloud Native Tooling
deislabs.io
Demo code
github.com/jldeen/helm3-demo
AKS docs
docs.microsoft.com/azure/aks
Microsoft Learn
aka.ms/k8slearning
Thanks!

Helm 3: Navigating to Distant Shores (KubeCon EU 2019)

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