Specifying hostname

[Zhe Wang]

Hi everyone,

Is there a way that I can specify the hostname of the resource I want to reserve? I tried to use <hostname> tag in a request Rspec. It seemed not working.

I also noticed that on some exogeni machine, the hostname is the client id. Is that true? Is that true for all exogeni machines? Is that also true for some instageni machines?

Thank you

Joe

[Niky Riga]

Yep the hostname of the VM should be the client id.

At IG this is universally true, at EG this is true for most of the images,
and in particular the default one.

Cheers,
Niky

Zhe Wang

June 3, 2014 at 6:57 PM

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[Zhe (Joe) Wang]

Thank you, Niky.

I tried it on some IG machines. The hostnames seem to be client_id+slice_name+"ch-geni-net"+AM domainname. i.e.:

VM.Joe-testing.ch-geni-net.instageni.clemson.edu

VM-0.Joe-testing.ch-geni-net.instageni.illinois.edu

VM-1.Joe-testing.ch-geni-net.instageni.gpolab.bbn.com

VM-2.Joe-testing.ch-geni-net.instageni.northwestern.edu

Is there anyway I can specify the hostname, such as "VM", like what EG machines do?

Thank you

Joe

[Divyashri Bhat]

Hi Joe,

Here is a small postboot script I use to extract the hostname and slicename in InstaGENI and then change the hostname.

#!/bin/bash

read -r slice1 </var/emulab/boot/nickname

slicename=$(echo $slice1 | cut -f2 -d.)

host1=$(hostname)

host=$(echo $host1 | cut -f1 -d.)

slice=`ruby -e "print '$slicename'[/[^+]*$/]"`

echo $host > /etc/hostname

/bin/hostname -F /etc/hostname

In the example you specified above, running the script here would give you a hostname as "vm" for VM.Joe-testing.ch-geni-net.instageni.clemson.edu

The hostnames are slightly different between the control and data plane interfaces. More details can be found here:

Ref: https://groups.google.com/d/topic/protogeni-users/qayXU23_mDc/discussion

Hope this helps.

Regards,

Divyashri Bhat

Graduate Student

University of Massachusetts, Amherst

E-mail: divyash...@gmail.com

[Zhe Wang]

Thank you very much, Divya.