vzcptcheck - show/test CPT properties
This low-level utility is used by vzmigrate
(8) to check if a container
can be succesfully restored on a destination system before performing live
migration. Currently, it is able to check CPT version and CPU flags
There are two modes of operation: to show a property and to test a property.
Showing mode is invoked if a property specified with no arguments; testing
mode requires one or many arguments after a property name. Generally, one runs
on one node to get a property, and on the other node to
check for the property.
Note that this utility does not guarantee that migration will succeed even if
all tests are passed. It merely gives a way to prevent migration which will
To get CPT version number, run vzcptcheck version on the source node.
Then, to check if this version number is supported, run vzcptcheck version
num on the destination node.
caps ctid capnum
To get CPU capabilities number, run vzcptcheck caps on the destination
node. Then, to check if a running CT can be live migrated to a node with such
a CPU, run vzcptcheck caps ctid capnum on the source node. To
check if a suspended container can be migrated (i.e. it can be restored on the
destination node), use the form without ctid: vzcptcheck caps
In showing mode, returns 0
upon success, or 1
in case of an error.
In testing mode, returns 0
if migration is possible (test passed),
in case of an error, or 2
if migration is not possible (test
To check if a CT 123 can be migrated to $DEST, run the following commands on the
source node. Note that error checking is omitted for brevity.
echo Got CPT version: $VERSION
ssh root@$DEST vzcptcheck version $VERSION
echo Version check result: $?
CAPS=$(ssh root@$DEST vzcptcheck caps)
echo Got caps: $CAPS
vzcptcheck caps $VEID $CAPS
echo Caps check result: $?
If both tests pass, you should get 0 as a result for both checks.
Copyright (C) 2013-2015, Parallels, Inc. Licensed under GNU GPL v2.