On Mon, Jun 10, 2013 at 09:07:08AM +0800, Gao feng wrote:
On 06/09/2013 08:14 PM, pr.G wrote:
Hello.
Is it possible to start container via libvirt_lxc without mounting /sys inside container?
When I start container via lxc-start and do not add mount point to config, then /sys inside container is empty.
When I do it via virsh -c lxc:// container.xml, then /sys contains sysfs of the host and /sys on host becomes remounting read-only.
how can it be true? Can you post your /proc/mounts on host and container?
Am I doing something wrong or is this feature of libvirt_lxc?
Absolutely it's not a feature.
Thanks!
Thanks for the quick reply. I was surprised too. I didn't post /proc/mounts to container.
On Mon, Jun 10, 2013 at 09:29:32AM +0400, свящ. Георгий Гольцов wrote: libvirt_lxc did it for me. I read http://libvirt.org/drvlxc.html about Filesystem mounts: " In the absence of any explicit configuration, the container will inherit the host OS filesystem mounts. A number of mount points will be made read only, or re-mounted with new instances to provide container specific data. The following special mounts are setup by libvirt * /dev a new "tmpfs" pre-populated with authorized device nodes * /dev/pts a new private "devpts" instance for console devices * /sys the host "sysfs" instance remounted read-only * /proc a new instance of the "proc" filesystem * /proc/sys the host "/proc/sys" bind-mounted read-only * /sys/fs/selinux the host "selinux" instance remounted read-only * /sys/fs/cgroup/NNNN the host cgroups controllers bind-mounted to * only expose the sub-tree associated with the container * /proc/meminfo a FUSE backed file reflecting memory limits of the * container " Can I disable this behavior? How do I specify an explicit configuration? Thanks. my container.xml: (The entire xml file is shown in the my original post)
... <devices> <emulator>/usr/lib/libvirt/libvirt_lxc</emulator> <filesystem type='mount'> <source dir='/var/lxc/ns1/rootfs'/> <target dir='/'/> </filesystem> ... </device> ...
Thanks.
root@host:~# uname -a Linux host 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2+deb7u2 x86_64 GNU/Linux
root@host:~# cat /etc/os-release PRETTY_NAME="Debian GNU/Linux 7.0 (wheezy)" ...
root@host:~# dpkg -l | grep libvirt ii libvirt-bin 0.9.12-11 amd64 programs for the libvirt library ii libvirt0 0.9.12-11 amd64 library for interfacing with different virtualization systems
container.xml: <domain type='lxc'> <name>ns1</name> <memory>524288</memory> <os> <type>exe</type> <init>/sbin/init</init> </os> <vcpu>1</vcpu> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/lib/libvirt/libvirt_lxc</emulator> <filesystem type='mount'> <source dir='/var/lxc/ns1/rootfs'/> <target dir='/'/> </filesystem> <interface type='bridge'> <source bridge='br0'/> <mac address='52:54:00:de:74:06'/> </interface> <console type='pty' /> </devices> </domain>
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