[Planetlab-users] "sudo" and "su" not working on some nodes

[Vamsi Kambhampati]

Hi,
  I have been trying to install additional packages on "dplanet1.uoc.edu" and "dplanet2.uoc.edu", but both "su" and "sudo" fail to work on these machines. Does anyone have an idea on why that is so (is it a site-wide restriction from uoc.edu?). 

In the past, I encountered a few machines that had similar problems with "su". When I logged into those machines, I noticed that I can sudo and then set the suid bit on su and my install scripts works. However, on "dplanet1.uoc.edu" and "dplanet2.uoc.edu" both these commands fail.

Output:
>>>>>>>>>>>>>>>>>>
[colostate_epiphany at dplanet1 ~]$ su -c 'yum -y --nogpgcheck install gcc gcc-c++ make'
su: cannot set groups: Protocol not supported

[colostate_epiphany at dplanet1 ~]$ sudo
sudo: must be setuid root
<<<<<<<<<<<<<<<<<<<<<

Thanks,
--Vamsi