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jaygooby
Asked: 2017-11-21 04:41:27 +0800 CST

Mounted device showing in df and /etc/mtab but missing from /proc/mounts and /proc/self/mounts. Why?

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I have an ec2 instance that is booted from an ebs snapshot. The boot device is /dev/sda1. When I call mount, df -h or cat /etc/fstab I can see the device:

$ mount
/dev/sda1 on / type ext3 (rw)

$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              50G   20G   28G  43% /

$ cat /etc/mtab
/dev/sda1 / ext3 rw 0 0

But when I cat /proc/mounts and cat /proc/self/mounts /dev/sda1 is missing. Why would this be?

This isn't causing me a problem, and the instance is running fine, it just means I can't use a monit update, because that's checking for mounted filesystems via /proc/self/mounts and complains that /dev/sda1 is missing (when it obviously isn't), and I'd like to understand why.

mount

0 Answers