[lxc-devel] bugs with LXC container : mount and rmmod command

Daniel Lezcano daniel.lezcano at free.fr
Fri Jan 8 12:14:36 UTC 2010


Elias Olivares wrote:
> 
> 
> Hi ! 
> 
> I've found the way to reproduce the bug. 
> 
> Host name : debian 
> Guest container name : container 
> 
> You MUST create a dedicated partition to share your containers (an other partition than " / ") 

Thanks, I will check when I have time.



> Here the container is created in /mnt/vmr1/ : 
> 
> debian:# df 
> 
> /dev/hda1 7850996 2058732 5393452 28% / 
> tmpfs 253768 0 253768 0% /lib/init/rw 
> udev 10240 108 10132 2% /dev 
> tmpfs 253768 0 253768 0% /dev/shm 
> /dev/hdb1 4127076 552552 3364880 15% /mnt/vmr1 
> 
> Then enter into the container (lxc-console -n container) and stop cron, syslog, bind 9,ssh processes. 
> 
> container:~# ps aux 
> 
> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND 
> root 1 0.0 0.1 1984 692 ? Ss 11:10 0:00 init [2] 
> root 387 0.0 0.4 5884 2272 console Ss 11:10 0:00 /bin/login -- 
> root 388 0.0 0.1 1992 572 tty1 Ss+ 11:10 0:00 /sbin/getty 38400 tty1 
> root 389 0.0 0.1 1992 568 tty2 Ss+ 11:10 0:00 /sbin/getty 38400 tty2 
> root 390 0.0 0.1 1992 568 tty3 Ss+ 11:10 0:00 /sbin/getty 38400 tty3 
> root 392 0.0 0.5 4132 2680 console S 11:11 0:00 -bash 
> root 584 0.0 0.1 2644 956 console R+ 11:43 0:00 ps aux 
> 
> Then use the mount command : 
> 
> container:~# mount -o remount,ro / 
> 
> Return to the Host and try to create a file in /mnt/vmr1/ . The folder is set in "read only". 
> 
> I tried with the 0.6.4 version and I have the same problem. 
> 
> 
> Elias Olivares 
> 
> 
> ----- Mail Original ----- 
> De: "Elias Olivares" <eolivares at 1g6.biz> 
> À: "Daniel Lezcano" <daniel.lezcano at free.fr> 
> Cc: lxc-devel at lists.sourceforge.net 
> Envoyé: Mercredi 6 Janvier 2010 16:05:58 
> Objet: Re: [lxc-devel] bugs with LXC container : mount and rmmod command 
> 
> 
> Ok thanks for this advice. I can't try now but I will try tommorow ... 
> 
> Elias 
> 
> 
> ----- Mail Original ----- 
> De: "Daniel Lezcano" <daniel.lezcano at free.fr> 
> À: "Elias Olivares" <eolivares at 1g6.biz> 
> Cc: lxc-devel at lists.sourceforge.net 
> Envoyé: Mercredi 6 Janvier 2010 13:03:59 
> Objet: Re: [lxc-devel] bugs with LXC container : mount and rmmod command 
> 
> Elias Olivares wrote: 
>> Hi 
>>
>>
>> My Lxc configuration file : ( /var/lib/lxc/xxx.1g6.biz /config ) 
>>
>> lxc.utsname = xxx.1g6.biz 
>> lxc.tty = 4 
>> lxc.pts = 1024 
>> lxc.network.type = veth 
>> lxc.network.flags = up 
>> lxc.network.link = br0 
>> lxc.network.name = eth0 
>> lxc.network.mtu = 1500 
>> #lxc.mount = 
>> lxc.rootfs = /mnt/vmr1/xxx.1g6.biz 
>> 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 
>>
>> # lxc-version 
>> lxc version: 0.6.3 
> 
> There were some modifications with how the rootfs is mounted. 
> 
> Can you check against the 0.6.4 version ? 
> 
> wget http://lxc.sourceforge.net/download/lxc/lxc-0.6.4.tar.gz 
> tar xvzf lxc-0.6.4.tar.gz 
> cd lxc-0.6.4 
> ./configure --localstate=/var --prefix=/usr --libdir=/usr/lib64 (if you 
> are on a x86_64 arch). 
> make && sudo make install 
> 
> Or may be you can try with the latest git repository: 
> 
> git-clone git://lxc.git.sourceforge.net/gitroot/lxc/lxc 
> cd lxc 
> ./autogen.sh 
> ./configure --localstate=/var --prefix=/usr --libdir=/usr/lib64 (if you 
> are on a x86_64 arch). 
> make && sudo make install 
> 
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