Article ID: 111672, created on Jul 20, 2011, last review on Aug 12, 2014

  • Applies to:
  • Virtuozzo containers for Linux 4.6

Symptoms

When migrating a container to the Parallels Virtuozzo Containers 4.6 node with a CentOS 5.6 host OS, there is an error about insufficient CPU capabilities:
[src@06:07:44][~]# vzmigrate --online --remove-area no root@10.55.65.170 101
root@10.55.65.170's password:
Connection to destination node (10.55.65.170) is successfully established
Moving/copying CT#101 -> CT#101, [], [] ...
Checking external bind mounts
Check cluster ID
Checking keep dir for private area copy
Checking SLM-only mode
Checking CPT image version for online migration
Checking capabilities for online migration
vztestcaps : Error: IPv6 not loaded on destination node
/usr/libexec/vztestcaps exited with code 1
Insufficient cpu capabilities on destination node
In case of insufficient cpu capabilities you can use '-f' option
to force migration, but in this case some applications such as java can fail after migration.
Can't move/copy CT#101 -> CT#101, [], [] : Insufficient cpu capabilities on destination node

Resolution

Follow these steps to resolve the issue:
  1. Check that the IPv6 module is loaded on the destination node:
    [dst@18:02:26][~]# lsmod | grep ipv6
    ipv6 463420 1 cnic
    xfrm_nalgo 43268 1 ipv6
  2. Make sure that IPv6 is enabled in /etc/vz/vz.conf:
    [dst@23:07:39][~]# grep -i IPv6 /etc/vz/vz.conf
    ## IPV6 support
    IPV6=yes
  3. Make sure that the IPv6 module is not disabled in /etc/modprobe.conf.
    The CentOS 5.6 installer disables the module and it does not work even though it is loaded.
    Example of a config. with IPv6 disabled:
    [dst@01:09:26][~]# cat /etc/modprobe.conf
    alias scsi_hostadapter ata_piix
    options ip_conntrack ip_conntrack_disable_ve0=1
    options ipv6 disable=1
    Remove the line to enable the IPv6 module:
    [dst@01:09:28][~]# cat /etc/modprobe.conf
    alias scsi_hostadapter ata_piix
    options ip_conntrack ip_conntrack_disable_ve0=1


    If you need to enable IPv6 for RHEL or CentOS 6, please check #116250.

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