[one-users] How use $UNAME

[Steven Timm]

We have been initializing Kerberos logins using opennebula 
contextualizaton on FermiCloud since the beginning.


The UNAME field automatically defined but not automatically passed to
contextualization scripts inside the VMs.

Here is a snippet of code that we use to do just that.

(The username is encoded as part of the context string in
base-64 so you have to parse it out).
----------------------------------------
   SUFFIX="@FNAL.GOV"
if [ $(which xpath) ] || yum install -y perl-XML-XPath; then
   USERNAME1=$(echo $CTX_USER | base64 -d | /usr/bin/xpath 
'/USER/NAME/text()')
else
   echo "This script ($0) needs xpath and YUM failed to install it via the 
perl-X
ML-XPath RPM"
   USERNAME1='MissingBINARYxpath'
fi

USERNAME2='gerard1'
mv /root/.k5login /root/k5login.old
echo $USERNAME1$SUFFIX > /root/.k5login
echo $USERNAME2$SUFFIX >> /root/.k5login

-----------------------

We pass this script as a contextualization file to
be used by the one-context rpm.

Also you have to add in the CONTEXT section of the template

   CTX_USER="$USER[TEMPLATE]",


Steve


On Thu, 24 Jul 2014, Alexandr Baranov wrote:

> 
> Hi,
> 
> I'm trying to setup kerberos login to log into VMs with kerberos username
> matching ONE username. I'm going to use UNAME variable and ONE documentation
> states it as pre-defined. So the question is: do I need to manually specify
> UNAME inside the VM template, or is it automatically defined and passed to
> contextualization scripts?
> 
> 
>

------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525
timm at fnal.gov  http://home.fnal.gov/~timm/
Fermilab Scientific Computing Division, Scientific Computing Services Quad.
Grid and Cloud Services Dept., Associate Dept. Head for Cloud Computing