[lxc-users] Unavailable loop devices

Serge Hallyn serge.hallyn at ubuntu.com
Tue May 6 15:22:17 UTC 2014 

Quoting Michael H. Warfield (mhw at WittsEnd.com):
> On Tue, 2014-05-06 at 14:59 +0000, Serge Hallyn wrote:
> > Nak.  Not until we hear more from Seth about his devloop or
> > namespaced devtmpfs.  Although a commented-out pair of lines
> > with an explanation above it would be ok.
> 
> Concur.  And you and I both know, from what Greg K-H has said face to
> face with all of us present, that they'll be singing Jingle Bells in

Curses, now i have jingle bells in my head.

> Hades before we get namespaced devtmpfs.  Not saying it's impossible but
> I'm not holding my breath.  He said "not no, hell no".  I am looking
> forward to this devloop thing though.
> 
> Regards,
> Mike
> 
> > Quoting CDR (venefax at gmail.com):
> > > Dear Mike
> > > It does work indeed.
> > > I suggest that the developers add these two lines to the sample configuration.
> > > Yours
> > > Philip
> > > 
> > > On Tue, May 6, 2014 at 9:28 AM, Michael H. Warfield <mhw at wittsend.com> wrote:
> > > > On Tue, 2014-05-06 at 06:25 -0400, CDR wrote:
> > > >> Dear Friends
> > > >
> > > >> I succesfully created a SLES 11 SP3 container, but when I try to do this
> > > >
> > > >> mount -o loop /images/SLE-11-SP3-SDK-DVD-x86_64-GM-DVD1.iso /media
> > > >
> > > >> mount: Could not find any loop device. Maybe this kernel does not know
> > > >>        about the loop device? (If so, recompile or `modprobe loop'.)
> > > >
> > > > Add the following to your container configuration file:
> > > >
> > > > lxc.cgroup.devices.allow = c 10:137 rwm # loop-control
> > > > lxc.cgroup.devices.allow = b 7:* rwm    # loop*
> > > >
> > > > Then make sure you have the following devices in your container /dev
> > > > directory...
> > > >
> > > > brw-rw----. 1 root disk  7,   0 May  2 13:03 /dev/loop0
> > > > brw-rw----. 1 root disk  7,   1 May  2 13:03 /dev/loop1
> > > > brw-rw----. 1 root disk  7,   2 May  2 13:03 /dev/loop2
> > > > brw-rw----. 1 root disk  7,   3 May  2 13:03 /dev/loop3
> > > > crw-------. 1 root root 10, 237 May  2 13:03 /dev/loop-control
> > > >
> > > > Regards,
> > > > Mike
> > > >
> > > >> My host is Fedora 20 and the LXC version is
> > > >
> > > >> rpm -qa | grep lxc
> > > >> libvirt-daemon-lxc-1.1.3.4-4.fc20.x86_64
> > > >> libvirt-daemon-driver-lxc-1.1.3.4-4.fc20.x86_64
> > > >> lxc-devel-1.0.0-1.fc20.x86_64
> > > >> lxc-debuginfo-1.0.0-1.fc20.x86_64
> > > >> lxc-libs-1.0.0-1.fc20.x86_64
> > > >> lxc-1.0.0-1.fc20.x86_64
> > > >
> > > >> the configuration is:
> > > >>
> > > >> lxc.start.auto = 0
> > > >> lxc.start.delay = 5
> > > >> lxc.start.order = 10
> > > >>
> > > >> # When using LXC with apparmor, uncomment the next line to run unconfined:
> > > >> #lxc.aa_profile = unconfined
> > > >>
> > > >> lxc.cgroup.devices.deny = a
> > > >> # /dev/null and zero
> > > >> lxc.cgroup.devices.allow = c 1:3 rwm
> > > >> lxc.cgroup.devices.allow = c 1:5 rwm
> > > >> # consoles
> > > >> lxc.cgroup.devices.allow = c 5:1 rwm
> > > >> lxc.cgroup.devices.allow = c 5:0 rwm
> > > >> lxc.cgroup.devices.allow = c 4:0 rwm
> > > >> lxc.cgroup.devices.allow = c 4:1 rwm
> > > >> # /dev/{,u}random
> > > >> lxc.cgroup.devices.allow = c 1:9 rwm
> > > >> lxc.cgroup.devices.allow = c 1:8 rwm
> > > >> lxc.cgroup.devices.allow = c 136:* rwm
> > > >> lxc.cgroup.devices.allow = c 5:2 rwm
> > > >> # rtc
> > > >> lxc.cgroup.devices.allow = c 254:0 rwm
> > > >>
> > > >> # mounts point
> > > >> lxc.mount.entry = proc proc proc nodev,noexec,nosuid 0 0
> > > >> lxc.mount.entry = sysfs sys sysfs defaults  0 0
> > > >> lxc.mount.entry = /images  /var/lib/lxc/utel-kde/rootfs/images none bind 0 0
> > > >>
> > > >>
> > > >> lxc.network.type=macvlan
> > > >> lxc.network.macvlan.mode=bridge
> > > >> lxc.network.link=eth1
> > > >> lxc.network.flags=up
> > > >> lxc.network.hwaddr = e2:91:a8:17:97:e4
> > > >> lxc.network.ipv4 = 0.0.0.0/21
> > > >>
> > > >>
> > > >> How do make the kernel loop module available for the container?
> > > >>
> > > >> Yours
> > > >> Philip
> > > >> _______________________________________________
> > > >> lxc-users mailing list
> > > >> lxc-users at lists.linuxcontainers.org
> > > >> http://lists.linuxcontainers.org/listinfo/lxc-users
> > > >
> > > > --
> > > > Michael H. Warfield (AI4NB) | (770) 978-7061 |  mhw at WittsEnd.com
> > > >    /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
> > > >    NIC whois: MHW9          | An optimist believes we live in the best of all
> > > >  PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!
> > > >
> > > >
> > > > _______________________________________________
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> 
> -- 
> Michael H. Warfield (AI4NB) | (770) 978-7061 |  mhw at WittsEnd.com
>    /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
>    NIC whois: MHW9          | An optimist believes we live in the best of all
>  PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!
> 



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