Re: [Xen-users] Install blktap2 kernel module on CentOS 6

[Kim Larry <relip@xxxxxx>]

For those who are stuck with this problem: I just compiled blktap-dkms source package from Ubuntu packages with patch for VM_RESERVED (not necessary if kernel version is lower than 3.7) and it just works fine. 

Larry

2013ë 10ì 26ì ìì 01:21ì "Kim Larry" <relip@xxxxxx> ìì:

Hi, 

I'm currently stuck with creating VM which cannot boot with disk using blktap2 driver. I've been searching nearly a whole week and I couldn't get a answer. When creating vm with blktap2, it keep shows a error: 

 libxl: debug: libxl_device.c:200:disk_try_backend: Disk vdev=xvda, backend tap unsuitable because blktap not available. 

VM configuration (XML):

<domain type='xen'>

  <name>test</name>

  <uuid>fed10f30-077d-4d2a-87aa-ccc76c290426</uuid>

  <memory unit='KiB'>524288</memory>

  <currentMemory unit='KiB'>524288</currentMemory>

  <vcpu placement='static'>1</vcpu>

  <os>

    <type>linux</type>

    <kernel>/xen/boot/vmlinuz-3.9.9</kernel>

    <initrd>/xen/boot/initramfs-3.9.9.img</initrd>

    <cmdline>root=/dev/xvda selinux=0</cmdline>

  </os>

  <clock offset='utc' adjustment='reset'/>

  <on_poweroff>destroy</on_poweroff>

  <on_reboot>restart</on_reboot>

  <on_crash>destroy</on_crash>

  <devices>

    <disk type='file' device='disk'>

      <source file='/xen/data/fed10f30-077d-4d2a-87aa-ccc76c290426/fed10f30-077d-4d2a-87aa-ccc76c290426.img'/>

      <driver name="tap2" type="raw" />

      <target dev='xvda' bus='xen'/>

    </disk>

    <interface type='bridge'>

      <mac address='00:16:3e:24:bd:8d'/>

      <source bridge='virbr0'/>

      <ip address='10.0.1.123'/>

      <script path='/etc/xen/scripts/vif-bridge'/>

    </interface>

    <console type='pty'>

      <target type='xen' port='0'/>

    </console>

  </devices>

</domain>

 

I believe loading blktap2 kernel module can solve this problem which I can't find it from major repository(CentOS repo, epel, etc..). Ubuntu and Debian have blktap-dkms package, is there no such package like blktap-dkms for CentOS? Already looked into xen source and found out tools/blktap2 directory but it doesn't contain kernel module. 

Xen version is 4.2.3 which is provided by http://xen.crc.id.au/ on CentOS 6.4. 

Larry

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