add securityContext and /proc/1/root tips for ephemeral containers#3334
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…ral containers Two additions to the Troubleshooting Volume Mounts section, sourced from customer feedback (ticket #8947): - Pods enforcing runAsNonRoot: wolfi-base runs as root by default and will fail with CreateContainerConfigError unless the ephemeral container patch includes a matching securityContext. - Accessing the target container filesystem without volumeMounts: /proc/1/root/ traverses the target container's full mount namespace (overlay + Kubernetes volumes), provided the ephemeral container runs as the same UID. Explicit volumeMounts remain the fallback when security policies block /proc access. Both points verified against a live k3d cluster. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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s-stumbo
approved these changes
May 18, 2026
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Two additions to the Troubleshooting Volume Mounts section, sourced from customer feedback (ticket 8947):
Pods enforcing
runAsNonRoot: wolfi-base runs as root by default and will fail withCreateContainerConfigErrorunless the ephemeral container patch includes a matching securityContext.Accessing the target container filesystem without
volumeMounts: /proc/1/root/ traverses the target container's full mount namespace (overlay + Kubernetes volumes), provided the ephemeral container runs as the same UID. Explicit volumeMounts remain the fallback when security policies block /proc access.Both points verified against a live k3d cluster:
runAsNonRoot: true (no runAsUser) and confirmed ephemeral wolfi-base container fails withCreateContainerConfigErrorsecurityContext: {runAsUser: 65532, runAsNonRoot: true}to the patch and confirmed container startsemptyDirvolume at/var/logand file at/tmp(overlay); confirmed both accessible via/proc/1/root/from ephemeral container without volumeMounts/var/login ephemeral container is empty without explicitvolumeMounts