Runpod•7mo ago•

2 replies

Unable to Mount tmpfs Filesystem as Root in Container Environment

Issue Description

When attempting to mount a

tmpfs

tmpfs

filesystem to the directory

./mem_disk

./mem_disk

as the

root

root

user inside a container, the operation fails with a "permission denied" error.

Command Executed:

mount -t tmpfs -o size=100G tmpfs ./mem_disk

mount -t tmpfs -o size=100G tmpfs ./mem_disk

Error Output:

mount: /workspace/akide/code/UniWorld-V1/mem_disk: permission denied.

mount: /workspace/akide/code/UniWorld-V1/mem_disk: permission denied.

Troubleshooting Steps Already Taken

1. Verified User Permissions: Confirmed the operation is run as

root

root

(no need for

sudo

sudo

).
2. Checked Mount Point:
- Created

./mem_disk

./mem_disk

directory (via

mkdir -p ./mem_disk

mkdir -p ./mem_disk

).
- Set ownership to

root:root

root:root

and permissions to

(via

chown root:root ./mem_disk

chown root:root ./mem_disk

and

chmod 755 ./mem_disk

chmod 755 ./mem_disk

).
- Checked for special attributes (e.g.,

immutable

immutable

flag) with

lsattr

lsattr

; none were found.
3. Simplified Mount Command: Tested without

size=100G

size=100G

(e.g.,

mount -t tmpfs tmpfs ./mem_disk

mount -t tmpfs tmpfs ./mem_disk

), but the same error occurred.
4. Checked Kernel Support: On the host,

grep TMPFS /boot/config-$(uname -r)

grep TMPFS /boot/config-$(uname -r)

returned

CONFIG_TMPFS=y

CONFIG_TMPFS=y

, confirming

tmpfs

tmpfs

is supported.

Suspected Cause

The container environment likely restricts

mount

mount

operations via security policies (e.g., lack of

--privileged

--privileged

mode in Docker). Containerized

root

root

users do not have full host

root

root

privileges by default, and

mount

mount

requires

CAP_SYS_ADMIN

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

tmpfs

mounting.
2. Providing steps to enable

mount

mount

permissions (e.g., adjusting Docker run flags or container security settings).
3. Alternatives if

tmpfs

tmpfs

mounting is restricted (e.g., using host-mounted tmpfs or alternative in-memory storage).

Additional Context:
- Container ID:

f695a62601b9

f695a62601b9

Runpod•7mo ago•

2 replies

Akide_Liu

Unable to Mount tmpfs Filesystem as Root in Container Environment

Issue Description

When attempting to mount a

tmpfs

tmpfs

filesystem to the directory

./mem_disk

./mem_disk

as the

root

root

user inside a container, the operation fails with a "permission denied" error.

Command Executed:

mount -t tmpfs -o size=100G tmpfs ./mem_disk

mount -t tmpfs -o size=100G tmpfs ./mem_disk

Error Output:

mount: /workspace/akide/code/UniWorld-V1/mem_disk: permission denied.

mount: /workspace/akide/code/UniWorld-V1/mem_disk: permission denied.

Troubleshooting Steps Already Taken

1. Verified User Permissions: Confirmed the operation is run as

root

root

(no need for

sudo

sudo

).
2. Checked Mount Point:
- Created

./mem_disk

./mem_disk

directory (via

mkdir -p ./mem_disk

mkdir -p ./mem_disk

).
- Set ownership to

root:root

root:root

and permissions to

(via

chown root:root ./mem_disk

chown root:root ./mem_disk

and

chmod 755 ./mem_disk

chmod 755 ./mem_disk

).
- Checked for special attributes (e.g.,

immutable

immutable

flag) with

lsattr

lsattr

; none were found.
3. Simplified Mount Command: Tested without

size=100G

size=100G

(e.g.,

mount -t tmpfs tmpfs ./mem_disk

mount -t tmpfs tmpfs ./mem_disk

), but the same error occurred.
4. Checked Kernel Support: On the host,

grep TMPFS /boot/config-$(uname -r)

grep TMPFS /boot/config-$(uname -r)

returned

CONFIG_TMPFS=y

CONFIG_TMPFS=y

, confirming

tmpfs

tmpfs

is supported.

Suspected Cause

The container environment likely restricts

mount

mount

operations via security policies (e.g., lack of

--privileged

--privileged

mode in Docker). Containerized

root

root

users do not have full host

root

root

privileges by default, and

mount

mount

requires

CAP_SYS_ADMIN

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

tmpfs

mounting.
2. Providing steps to enable

mount

mount

permissions (e.g., adjusting Docker run flags or container security settings).
3. Alternatives if

tmpfs

tmpfs

mounting is restricted (e.g., using host-mounted tmpfs or alternative in-memory storage).

Additional Context:
- Container ID:

f695a62601b9

f695a62601b9

Unable to Mount tmpfs Filesystem as Root in Container Environment

Issue Description

Troubleshooting Steps Already Taken

Suspected Cause

Request

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Unable to Mount tmpfs Filesystem as Root in Container Environment

Issue Description

Troubleshooting Steps Already Taken

Suspected Cause

Request

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