sysfs is remounted as read-only in RHEL6

Solution Unverified - Updated -

Issue

  • sysfs is remounted as read-only.
  • /sys is remounted as read-only.
  • When writing to /sys, it prompts "Read-only file system".
# echo never > /sys/kernel/mm/transparent_hugepage/defrag
-bash: /sys/kernel/mm/transparent_hugepage/defrag: Read-only file system

Environment

  • Red Hat Enterprise Linux 6
  • Docker

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