Hi,
I’m using an LXC to build up a rootfs for another target, and am unable to
mount a squashfs image:
root@cd-build-dev-385:~# mount -t squashfs -r myproject.squashfs mnt
ioctl: LOOP_SET_STATUS: Operation not permitted
root@cd-build-dev-385:~#
If I instead use ‘unsquashfs’, I get into device creation errors:
root@cd-build-dev-385:~# unsquashfs -x myproject.squashfs
Parallel unsquashfs: Using 4 processors
13529 inodes (15282 blocks) to write
[|
] 21/15282 0%
create_inode: failed to create character device squashfs-root/dev/console,
because Operation not permitted
create_inode: failed to create character device squashfs-root/dev/null, because
Operation not permitted
create_inode: failed to create character device squashfs-root/dev/ptmx, because
Operation not permitted
create_inode: failed to create character device squashfs-root/dev/urandom,
because Operation not permitted
create_inode: failed to create character device squashfs-root/dev/zero, because
Operation not permitted
I assume the two issues are related, assuming that creation of device nodes
within an unprivileged container is prohibited. In my case I’m less concerned
about security, and am using containers more for encapsulation.
Is there a configuration override that will allow dynamic device creation
within a container, or another way of going about this? I know that I can add
device nodes externally using ‘lxc device add …’ and have used it for creating
loopback devices, but that’s static.
Environment:
host: Ubuntu 14.04
LXC:
ben@ben-sc:~$ dpkg -l | grep lx[cd]
ii liblxc1
2.0.7-0ubuntu1~14.04.1skyport1 amd64 Linux Containers
userspace tools (library)
ii lxc-common
2.0.7-0ubuntu1~14.04.1skyport1 amd64 Linux Containers
userspace tools (common tools)
ii lxcfs
2.0.6-0ubuntu1~14.04.1 amd64 FUSE based filesystem
for LXC
ii lxd
2.0.9-0ubuntu1~14.04.1 amd64 Container hypervisor
based on LXC - daemon
ii lxd-client
2.0.9-0ubuntu1~14.04.1 amd64 Container hypervisor
based on LXC - client
Note that I’ve built the LXC libraries from source, but based on the current
‘ubuntu-trusty-backports’ .deb packages.
regards,
Ben
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