website/content/en/docs/reference/command-line-tools-reference/feature-gates/ReadOnlyAPIDataVolumes.md

title	content_type	_build	stages	removed
ReadOnlyAPIDataVolumes	feature_gate	list render never false	stage defaultValue fromVersion toVersion beta true 1.8 1.9 stage fromVersion toVersion stable 1.10 1.10	true

Set configMap, secret, downwardAPI and projected {{< glossary_tooltip term_id="volume" text="volumes" >}} to be mounted read-only.

Since Kubernetes v1.10, these volume types are always read-only and you cannot opt out.