So I have been working with the OVM CLI lately to try and fill in some holes in my knowledge and provide for some easily reproducible procedures, usually around consistency of the environment when performing frequent tear downs and upgrades. So expect to see more OVM related scripts going forward.
Today we are going over a fairly simple script. I like to use all lower case in my VM naming conventions. So I wrote up a little script to check every name in the environment and then rename it if it is not already lower case. Then once I completed this I decided to change it to be a toggle, so that those of you who prefer upper case would not feel left out. Basically what we are doing, is simply performing a few calls to the ovmcli to collect the information necessary to make our changes. Then we perform the changes via a separate call. Prior to making the edit call, we compare the actual value with the requested value in order to see if it is already what we wanted.
I have built a few parameters into the script, we can select the case, upper or lower, we can also select the OVM 3.x Manager Server, and the username and port. The username and port are built with default values of admin and 10000.
Please keep in mind that this script will make multiple SSH connections to the ovmcli, as such you will want to use keys to streamline this authentication. I have an article covering that here.
Name : changecase-vmname.sh
Version : 1.0.1
MD5 : 5006c9ff20b3301e66ac503f417b98ee
SHA256 : bfff98b74c54f1fec3ec540a22ca4b1377c9f4b25e0b90ddbb722eeb64bf6bc8
URL : http://source.allanglesit.net/pub/changecase-vmname.sh
#!/bin/bash
# chkconfig:
# description:
#
#: Script Name : changecase-vmname.sh
#: Version : 1.0
#: Author : Matthew Mattoon - http://blog.allanglesit.com
#: Date Created : January 26, 2013
#: Date Updated : February 20, 2013
#: Description : Changes case of all Oracle VM 3.x VMs to either upper or lower case.
#: Examples : changecase-vmname.sh -c CASE -m OVMMANAGER -p PORT -u USER
#: : changecase-vmname.sh -c lower -m ovmserver.localdomain
usage()
{
cat << EOF
usage: $0 options
This script allows you to change case on all OVM 3.x VMs to either uppercase or lowercase.
OPTIONS:
-h Show this message
-c The preferred case for all VMs (required). upper or lower
-m OVM 3.x Manager Server (required).
-p OVM 3.x Manager Port (default: 10000).
-u OVM 3.x Manager User (default: admin).
EOF
}
while getopts "hc:m:pu" OPTION
do
case $OPTION in
h) usage; exit 1;;
c) case=$OPTARG;;
m) ovmmgr=$OPTARG;;
p) ovmport=$OPTARG;;
u) ovmuser=$OPTARG;;
?) usage; exit 1;;
esac
done
if [[ -z $case ]] || [[ -z $ovmmgr ]]
then
usage
exit 1
fi
if [ $case != "lower" -a $case != "l" -a $case != "upper" -a $case != "u" ]
then
usage
exit 1
fi
if [[ -z $ovmuser ]]
then
ovmuser=admin
fi
if [[ -z $ovmport ]]
then
ovmport=10000
fi
if [ $case = "lower" -o $case = "l" ]
then
trcase="'[:upper:]' '[:lower:]'"
fi
if [ $case = "upper" -o $case = "u" ]
then
trcase="'[:lower:]' '[:upper:]'"
fi
for i in `ssh -p $ovmport $ovmuser@$ovmmgr "list vm" | grep -v 'OVM>\|Command:\|Status:\|Time:\|Data:' | sed 's/ /:/g'`
do
id=`echo $i | cut -d ":" -f 3`
echo -n "Examining $id... "
vmname=`ssh -p $ovmport $ovmuser@$ovmmgr "show vm id=$id" | grep -v 'OVM>\|Command:\|Status:\|Time:\|Data:' | grep "Name" | sed 's/ = /=/' | cut -d = -f 2`
newvmname=`echo $vmname | tr $trcase`
if [ $vmname != $newvmname ]
then
echo "Renaming $vmname to $newvmname"
ssh -p $ovmport $ovmuser@$ovmmgr edit vm id=$id name="$newvmname" | grep "Status:"
else
echo "Rename not required"
fi
done
