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Add feature flag support #339

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Add feature flag support #339

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kragniz
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@kragniz kragniz commented Apr 24, 2018

What this PR does / why we need it: adds support for generic feature flags

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #335

Special notes for your reviewer:

Release note:

Add support for feature flags

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kragniz
kragniz commented Apr 24, 2018
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pkg/util/feature/feature_gate.go
limitations under the License.
*/

// NOTE: this file is based off k8s.io/apiserver/pkg/util/feature
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I was originally making some changes here, but they ended up not being necessary. Can we just pull this straight from k8s.io/apiserver/pkg/util/feature?

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Yeah, and it looks like it's already in vendor/.

wallrj
wallrj approved these changes Apr 26, 2018
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Thanks @kragniz.

Looks like a good start.

  • Add a note about feature flags to the developer docs and maybe the user docs.
  • Enable the example feature flag in the E2E tests
  • Import rather than copy code from k8s.io/apiserver as you suggested.
  • Maybe quickly summarise what you were telling me about how kubeadm put feature flags in the API resources....so that I can enable features on a per-cluster basis...might we do that as well....or would that be equivalent to making an v2alpha1 API?

contrib/charts/navigator/values.yaml
@@ -6,6 +6,9 @@ createAPIService: true
rbac:
enabled: true

# A set of key=value pairs that describe feature gates for various features. Use --help to see available flags.
featureGates: ""
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Comma or space separated?

cmd/controller/app/options/options.go
@@ -66,6 +76,8 @@ func (s *ControllerOptions) AddFlags(fs *pflag.FlagSet) {
fs.DurationVar(&s.LeaderElectionRetryPeriod, "leader-election-retry-period", defaultLeaderElectionRetryPeriod, ""+
"The duration the clients should wait between attempting acquisition and renewal "+
"of a leadership. This is only applicable if leader election is enabled.")
fs.StringVar(&s.FeatureGatesString, "feature-gates", defaultFeatureGatesString, "A set of key=value pairs that describe feature gates for various features. "+
"Options are:\n"+strings.Join(features.KnownFeatures(&features.InitFeatureGates), "\n"))
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Comma or space separated?

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wallrj commented Apr 26, 2018

The output looks like this:

./navigator-controller_linux_amd64 --help

cert-manager is a Kubernetes addon to automate the management and issuance of
TLS certificates from various issuing sources.

It will ensure certificates are valid and up to date periodically, and attempt
to renew certificates at an appropriate time before expiry.

Usage:
  cert-manager-controller [flags]

Flags:
      --alsologtostderr                           log to standard error as well as files
      --feature-gates string                      A set of key=value pairs that describe feature gates for various features. Options are:
Example=true|false (ALPHA - default=false)
...

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@kragniz: PR needs rebase.

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Feature flag support
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