When building container images, ensure they’re compatible with restricted Kubernetes security contexts. Use numeric UIDs instead of symbolic usernames, and test compatibility with the following security constraints:
securityContext:
runAsNonRoot: true
allowPrivilegeEscalation: false
capabilities:
drop:
- ALL
This approach prevents privilege escalation attacks and follows the principle of least privilege. For example, in a Dockerfile, prefer USER 1000 over USER jovyan to ensure compatibility with security contexts that enforce non-root execution. This practice enhances security in various Kubernetes environments, including those that don’t automatically apply these restrictions.
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