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

[Elias Olivares]

Hi ! 

To reproduce the "mount bug" : 

You have stop some services inside the container (cron,syslog,bind9) : 

dns:~# ps xua 
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND 
root 1 0.0 0.0 1984 696 ? Ss 19:03 0:00 init [2] 
root 349 0.0 0.0 3040 984 ? Ss 19:03 0:00 /sbin/syslogd 
root 358 0.0 0.0 1648 404 ? Ss 19:03 0:00 /sbin/klogd -x 
bind 375 0.2 0.0 108284 17524 ? Ssl 19:03 0:00 /usr/sbin/named -u bind 
root 396 0.0 0.0 5276 976 ? Ss 19:03 0:00 /usr/sbin/sshd 
root 420 0.0 0.0 2384 804 ? Ss 19:03 0:00 /usr/sbin/cron 
root 438 0.0 0.0 6028 2912 console Ss 19:03 0:00 /bin/login -- 
root 439 0.0 0.0 1992 568 tty1 Ss+ 19:03 0:00 /sbin/getty 38400 tty1 linux 
root 440 0.0 0.0 1992 572 tty2 Ss+ 19:03 0:00 /sbin/getty 38400 tty2 linux 
root 441 0.0 0.0 1992 572 tty3 Ss+ 19:03 0:00 /sbin/getty 38400 tty3 linux 
root 442 0.0 0.0 1992 572 tty4 Ss+ 19:03 0:00 /sbin/getty 38400 tty4 linux 
root 443 0.7 0.0 4132 2652 console S 19:03 0:00 -bash 
root 456 0.0 0.0 2644 948 console R+ 19:04 0:00 ps xua 
dns:~# mount -o remount,ro / 
mount: / is busy 
dns:~# /etc/init.d/sysklogd stop 
Stopping system log daemon.... 
dns:~# /etc/init.d/cron stop 
Stopping periodic command scheduler: crond. 
dns:~# /etc/init.d/bind9 stop 
Stopping domain name service...: bind9 waiting for pid 375 to die. 
dns:~# mount -o remount,ro / 

Regards, 

Elias Olivares 


----- Mail Original ----- 
De: "Elias Olivares" <eolivares at 1g6.biz> 
À: lxc-devel at lists.sourceforge.net 
Envoyé: Mardi 5 Janvier 2010 15:34:53 
Objet: [lxc-devel] bugs with LXC container : mount and rmmod command 


Hello, 

My company is looking for migrate from OpenVz to LXC container tools but we have found some isolation problems. 

I've created a dedicated partition to share my containers in : /mnt/vmr1/ 

I've created a container with an debian debootstrap there : /mnt/vmr1/debiandebootstrap 

Then I enter into a container (lxc-console -n debiandebootstrap) and I use this specific mount command : " mount -o remount,ro / " . 

When I return to the Host , /mnt/vmr1/ is set in "read only". The mount command ran in the guest has interacted with the host. 

I have the same problem with "rmmod" command. When I try to remove some module in the guest container it remove it on the Host machine. 

Someone can help me ? 

Regards, 

Elias Olivares 





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