there are some situations, when after incorrectly finished vm migration in opennebula. there are two last history reasons as 'none' (0) and this causes that opennebula does not allow next live migration. this is first try to catch the problem early and not at the migration moment.

one-check-double-none.sh

#!/bin/bash

[ "$DEBUG" = "YES" ] \
	&& set -x

qverbose ()
{
	[ "$VERBOSE" = "YES" ] \
	&& return 0 || return 1
}

list_running_vmids ()
{ # none
	onevm list --xml \
	| xmlstarlet sel -t -m '/VM_POOL/VM' -v 'ID' -n
}

get_vmid_history_count ()
{ # 1: vmid
	onevm show --xml $1 \
	| xmlstarlet sel -t -m '/VM/HISTORY_RECORDS/HISTORY' -v 'SEQ' -n \
	| grep -v '^$' \
	| tail -n 1
}

get_vmid_history_last_two_reasons ()
{ # 1: vmid
	onevm show --xml $1 | xmlstarlet sel -t -m '/VM/HISTORY_RECORDS/HISTORY' -v 'REASON' -n | grep -v '^$' | tail -n 2
}

list_running_vmids | while read vmid
do
	[ -n "$vmid" ] || continue

	qverbose \
	&& echo "# $vmid"

	last_vm_history_record=""
	last_vm_history_record=$( get_vmid_history_count "$vmid" )

	# list last two history reasons for vm, get rid of the none/0 states
	# if there is nothing left, last two were none/0 and this looks like a problem
	non_none_reasons=""
	if [ "$last_vm_history_record" -gt "1" ]
	then
		non_none_reasons=$( get_vmid_history_last_two_reasons $vmid | grep -v '^0$' )
		if [ -z "$non_none_reasons" ]
		then
			echo "ERROR: there is double-none in history for vmid $vmid" >&2
		else
			echo "OK: vmid $vmid is ok"
		fi
	else
		echo "OK: vmid $vmid is ok, has short history"
	fi
done