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AppArmor 错误：在更新版本的 libvirt (1.2.12) 上启动 lxc 后出现“无效的 VM 定义”

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AppArmor 错误：在更新版本的 libvirt (1.2.12) 上启动 lxc 后出现“无效的 VM 定义”

我正在尝试在较新版本的 libvirtd 上启动 LXC，但启动失败并出现以下错误：

$ virsh -c lxc: start textlxc
error: Failed to start domain testlxc
error: internal error: cannot load AppArmor profile 'libvirt-dfb2c573-05cb-4ca3-9e46-bea6cebf0f9f'

错误消息/var/log/libvirt/libvirtd.log

2015-06-23 12:13:12.306+0000: 14141: error : virCommandWait:2532 : internal error: Child process (/usr/lib/libvirt/virt-aa-helper -p 0 -c -u libvirt-dfb2c573-05cb-4ca3-9e46-bea6cebf0f9f) unexpected exit status 1: virt-aa-helper: error: /proc/meminfo
virt-aa-helper: error: skipped restricted file
virt-aa-helper: error: invalid VM definition

2015-06-23 12:13:12.306+0000: 14141: error : AppArmorGenSecurityLabel:468 : internal error: cannot load AppArmor profile 'libvirt-dfb2c573-05cb-4ca3-9e46-bea6cebf0f9f'

这是我的测试lxc.xml文件

<domain type='lxc'>
  <name>testlxc</name>
  <uuid>dfb2c573-05cb-4ca3-9e46-bea6cebf0f9f</uuid>
  <memory unit='KiB'>4048292</memory>
  <currentMemory unit='KiB'>4048292</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='x86_64'>exe</type>
    <init>/sbin/init</init>
  </os>
  <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' accessmode='passthrough'>
      <source dir='/var/lib/libvirt/filesystems/testlxc'/>
      <target dir='/'/>
    </filesystem>
    <filesystem type='mount' accessmode='passthrough'>
      <source dir='/var/lib/libvirt/filesystems/testlxc-data'/>
      <target dir='/mnt/data'/>
    </filesystem>
    <filesystem type='mount' accessmode='passthrough'>
      <source dir='/var/run/testlxc/lxc'/>
      <target dir='/mnt/run'/>
    </filesystem>
    <filesystem type='mount' accessmode='passthrough'>
      <source dir='/proc/meminfo'/>
      <target dir='/proc/meminfo'/>
    </filesystem>
    <console type='pty' tty='/dev/pts/1'>
      <source path='/dev/pts/1'/>
      <target type='lxc' port='0'/>
      <alias name='console0'/>
    </console>
  </devices>
</domain>

运行的Libvirt版本是1.2.12，之前我曾在1.2.2版本上成功运行过lxc。

$ libvirtd --version
libvirtd (libvirt) 1.2.12

答案1

我已将问题追溯到virt-aa-helper实用程序中的域 XML 验证。该实用程序应该根据需要生成 apparmor 配置文件。失败的不是 XML 结构，但报告的错误似乎表明情况确实如此。LXC容器virDomainDefParseXML中的函数函数内的逻辑验证domain_conf.c已损坏。

我不太熟悉 libvirt 代码，无法修改这个共享区域 —— 我可能破坏了其他东西，但以下补丁似乎有效：

if (!(flags & VIR_DOMAIN_DEF_PARSE_SKIP_OSTYPE_CHECKS)) {
    /* If the logic here seems fairly arbitrary, that's because it is :)
     * This is duplicating how the code worked before
     * CapabilitiesDomainDataLookup was added. We can simplify this,
     * but it would take a bit of work because the test suite fails
     * in numerous minor ways. */
    bool use_virttype = ((def->os.arch == VIR_ARCH_NONE) ||
        !def->os.machine);
    virCapsDomainDataPtr capsdata = NULL;

读书

if (!(flags & VIR_DOMAIN_DEF_PARSE_SKIP_OSTYPE_CHECKS)) {
    /* If the logic here seems fairly arbitrary, that's because it is :)
     * This is duplicating how the code worked before
     * CapabilitiesDomainDataLookup was added. We can simplify this,
     * but it would take a bit of work because the test suite fails
     * in numerous minor ways. */
    bool use_virttype = (def->os.type != VIR_DOMAIN_OS_TYPE_EXE) &&
        ((def->os.arch == VIR_ARCH_NONE) ||
          !def->os.machine);
    virCapsDomainDataPtr capsdata = NULL;

不幸的是，我找不到不重新编译就能解决这个问题的方法。如果你使用的是 64 位机器，你可以从下载我本地构建的软件包此链接（抱歉，我的微软账户）。

笔记：要查看您是否受到此错误的影响，请在命令提示符中输入以下内容（复制自此论坛帖子)：

$ export VM=foo ; virsh -c lxc:// dumpxml $VM |\
   sudo /usr/lib/libvirt/virt-aa-helper -c \
   -u libvirt-`virsh -c lxc:// domuuid $VM`

失败的 lxc 容器的名称在哪里foo。如果您看到输出

virt-aa-helper: error: could not parse XML
virt-aa-helper: error: could not get VM definition

那么很可能是同一个错误。

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