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Nils
Asked: 2015-05-07 07:36:09 +0800 CST

Why do I not get a console for my CentOS6 PV DomU on CentOS6XEN4 Dom0?

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I am currently in the process of migrating from SLES11 SP3 as Dom0 - running the "old" xend/xm-stack to CentOS6 XEN4 running the "new" xl-stack.

I stumbled across a strange problem: After pygrub starts up I can see the correct boot line. But: then I get this:

xenconsole: Could not open tty `': No such file or directory
  libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: console child [0] exited with error status 2

That message is repeated another time, leaving me on the console of the Dom0 with a DomU in the state "running" doing nothing. I have to kill the DomU with "xl destroy" to get back into a defined state.

On the web I found nothing useful on the topic. The CentOS6 XEN4 Wiki does only seem to cover xend/xm.

When doing the same procedure with a PV CentOS 5 DomU the DomU starts up without modification.

centos6

2 Answers

  1. If you ssh into your Dom0 (Xen Core).. Su to root... . then do a 'xm list' first is your Centos domU vm running? or is it powered off by defualt.

    If it is you can do a 'xm start xxxxx' where xxxxx is the name that was shown in the 'xm list'

    Then wait a couple of seconds and try 'xm console xxxxx' where again xxxxx is the name of the vm your trying to console into..

    Barring that try updating the dom0 XEN Core.. with '# yum update' '# yum upgrade' to pull down any updates or fixes for XEN. or with "sudo" priviledges..

    Then 'reboot' the server and see what happes... I had a similar issue with a VM a while back. some times you may have to put a delay in its startup script for that VM. So that the server has time to settle down before launching the VM's. Expecially if you have too many VM's and a low ram / slow hard disk access server.. Mine is running on a Intel NUC Dual Core, with 8 G Ram / 7200 RPM 2.5" Drive.. I still had to throttle the VM's startups... (Only part is at the second forgot how.. think I had to edit each vm config / ini file for that)...

    Hope this helps... David. Just another comm guy on the big web of a net.

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  2. Best Answer

    xenconsoled was not running. After starting it, the problem was gone. Why it was not running is a different question...

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