Unable to Mount tmpfs Filesystem as Root in Container Environment
Issue Description
When attempting to mount a
Command Executed:
Error Output:
Troubleshooting Steps Already Taken 1. Verified User Permissions: Confirmed the operation is run as
2. Checked Mount Point:
- Created
- Set ownership to
- Checked for special attributes (e.g.,
3. Simplified Mount Command: Tested without
4. Checked Kernel Support: On the host,
Suspected Cause The container environment likely restricts
Request Please assist with:
1. Confirming if the container is running with sufficient privileges to allow
2. Providing steps to enable
3. Alternatives if
Additional Context:
- Container ID:
tmpfs filesystem to the directory ./mem_disk as the root user inside a container, the operation fails with a "permission denied" error.Command Executed:
Error Output:
Troubleshooting Steps Already Taken 1. Verified User Permissions: Confirmed the operation is run as
root (no need for sudo).2. Checked Mount Point:
- Created
./mem_disk directory (via mkdir -p ./mem_disk).- Set ownership to
root:root and permissions to 755 (via chown root:root ./mem_disk and chmod 755 ./mem_disk).- Checked for special attributes (e.g.,
immutable flag) with lsattr; none were found.3. Simplified Mount Command: Tested without
size=100G (e.g., mount -t tmpfs tmpfs ./mem_disk), but the same error occurred.4. Checked Kernel Support: On the host,
grep TMPFS /boot/config-$(uname -r) returned CONFIG_TMPFS=y, confirming tmpfs is supported.Suspected Cause The container environment likely restricts
mount operations via security policies (e.g., lack of --privileged mode in Docker). Containerized root users do not have full host root privileges by default, and mount requires CAP_SYS_ADMIN capabilities, which may be blocked.Request Please assist with:
1. Confirming if the container is running with sufficient privileges to allow
tmpfs mounting.2. Providing steps to enable
mount permissions (e.g., adjusting Docker run flags or container security settings).3. Alternatives if
tmpfs mounting is restricted (e.g., using host-mounted tmpfs or alternative in-memory storage).Additional Context:
- Container ID:
f695a62601b91 Reply
Unknown User•4mo ago
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