Public bug reported:
I'm on Ubuntu 14.04.3 LTS, and recently upgraded to docker.io
1.6.2~dfsg1-1ubuntu4~14.04.1. This package provides the file
/etc/init/docker.conf, which includes this:
pre-start script
# Cleanup any stale mounts left from previous shutdown
# see https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1404300
grep "mapper/docker" /proc/mounts | awk '{ print $2 }' | \
xargs -r umount || true
end script
My host's root filesystem is on an LVM volume named "docker1-root", and
so /proc/mounts includes the line
/dev/mapper/docker1-root / ext4 rw,relatime,errors=remount-
ro,data=ordered 0 0
Thus running the docker.io pre-start script causes the root filesystem
to be remounted read-only.
** Affects: docker.io (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1511784
Title:
Starting docker.io remounts root filesystem read-only
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