Public bug reported:
I have a directory with a minimal Xenial installation, which I want to
share among several containers. I also have a directory with just Apache
and its dependencies installed.
systemd-nspawn has an option --overlay to "Combine multiple directory
trees into one overlay file system and mount it into the container."
Neither `systemd-nspawn --overlay=/path/to/xenial:/path/to/apache -D
/path/to/container` nor `systemd-nspawn
--overlay=/path/to/xenial:/path/to/apache:/path/to/container -D
/path/to/container` works as expected.
Both report an error "Directory /path/to/container doesn't look like it
has an OS tree. Refusing.". Of course, it doesn't have an OS tree, this
is what the base overlays are for.
Looking at the source code, creating a subdirectory
/path/to/container/usr works around this. But now it complains about
"Failed to create directory /path/to/container/sys/fs/selinux: Read-only
file system" twice, then about a missing timezone, and finally aborts
with
Creating mount point for overlay /path/to/container/path/to/apache
failed: No such file or directory
Doing this manually instead, works fine:
mount -t overlay -o
lowerdir=/path/to/apache:/path/to/xenial,upperdir=/path/to/container,workdir=/path/to/workdir
none /path/to/container
systemd-nspawn -D /path/to/container
1)
Description: Ubuntu 16.04 LTS
Release: 16.04
2)
systemd-container:
Installed: 229-4ubuntu6
Candidate: 229-4ubuntu6
Version table:
*** 229-4ubuntu6 500
500 http://de.archive.ubuntu.com/ubuntu xenial-updates/universe amd64
Packages
100 /var/lib/dpkg/status
229-4ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
3)
I expect systemd-nspawn to mount an overlayfs with the provided directories and
then start the container with all the directories combined.
4)
systemd-nspawn complains
- Directory /path/to/container doesn't look like it has an OS tree.
Refusing.
and after working around this (among other irrelevant error messages)
- Creating mount point for overlay /path/to/container/path/to/apache
failed: No such file or directory
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1594849
Title:
systemd-nspawn: option --overlay not working
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