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

[Elias Olivares]

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 " / ") 

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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