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Re: [libvirt] [PATCH v3 00/12] Add user namespace support for libvirt lxc



Am 11.06.2013 08:17, schrieb Gao feng:
:)
have fun with user namespace & libvirt.
And thanks for your test.

Found an nasty issue.
It looks like libvirt execs the lxc init within the wrong rootfs context.

My container's rootfs contains the script named /xxx.
If I try to use it as init, libvirt fails.

2013-06-13 13:18:04.499+0000: 1: error : lxcContainerChild:1941 : cannot find init path '/xxx' relative to container root: No such file or directory

It fails because it looks in the rootfs of the host.
If I create /xxx within my hostfs it works.

Nobody noticed so far because in 99.9% of all case you have /bin/bash, /sbin/init and friends in both filesystems.

---cut---
<domain type='lxc'>
  <name>c_test1</name>
  <memory>102400</memory>
  <os>
    <type>exe</type>
    <init>/xxx</init>
  </os>
  <idmap>
        <uid start='0' target='100000' count='100000'/>
        <gid start='0' target='100000' count='100000'/>
  </idmap>
  <devices>
        <console type='pty'/>
        <filesystem type='mount'>
          <source dir='/home/container/c_test1/rootfs/'/>
          <target dir='/'/>
        </filesystem>
        <filesystem type='ram'>
          <source usage='1024' />
          <target dir='/sys/fs/cgroup/systemd'/>
        </filesystem>
        <interface type='bridge'>
         <source bridge='br0'/>
         <mac address='52:54:00:be:49:be'/>
       </interface>
  </devices>
</domain>
---cut---

Thanks,
//richard


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