嵌套在LXC容器中的debootstrap由于设备而未能挂载proc。

Question

在amd64 LXC容器中运行的命令：

debootstrap --arch armhf --foreign --variant=buildd --components=main,restricted,universe,multiverse vivid /var/lib/schroot/chroots/vivid-armhf http://ports.ubuntu.com/ubuntu-ports

最终还是失败了：

W: Failure trying to run:  mount -t proc proc /proc
W: See //debootstrap/debootstrap.log for details

主机上的syslog有以下内容：

audit: type=1400 audit(1449495124.972:29): apparmor="DENIED" operation="mount" info="failed type match" error=-13 profile="lxc-container-default" name="/var/lib/schroot/chroots/vivid-armhf/proc/" pid=25739 comm="mount" fstype="proc" srcname="proc" flags="rw"
audit: type=1400 audit(1449495124.976:30): apparmor="DENIED" operation="mount" info="failed type match" error=-13 profile="lxc-container-default" name="/var/lib/schroot/chroots/vivid-armhf/proc/" pid=25739 comm="mount" fstype="proc" srcname="proc" flags="ro"

这真的是不可能的：

user@vm:~$ sudo chroot /var/lib/schroot/chroots/vivid-armhf
/usr/bin/groups: cannot find name for group ID 0
I have no name!@vm:/# mount -t proc proc /proc
mount: proc is write-protected, mounting read-only
mount: cannot mount proc read-only
I have no name!@vm:/#

需要向LXC容器配置中添加什么才能允许这样的挂载？

Answer 1

新概况：

sudo tee /etc/apparmor.d/lxc/lxc-default-with-proc-mounting <<EOM
profile lxc-default-with-proc-mounting flags=(attach_disconnected,mediate_deleted) {
  #include <abstractions/lxc/container-base>
  mount fstype=proc options=ro -> /**,
}
EOM

进入容器配置：

lxc.aa_profile = lxc-default-with-proc-mounting

重新加载配置文件：

sudo systemctl reload apparmor

重新启动容器。