Study at Cambridge
About the University
Research at Cambridge

IT Services

Department of Engineering

Log in with Raven
  • Home
  • About
    • IT Strategy
  • Services
    • Administrative and information systems
    • Audio-visual facilities
    • Central Computing System
    • Desktop services
    • Network and telephones
    • Printing services
    • Projects and system development
    • Server room facilities for research
    • User accounts and passwords
  • Support
    • IT Helpdesk
    • Computing help web pages
    • Divisional and research support
    • IT Administration
  • News
  • Blogs
  • People
  • Contact us
Home / Blogs / Problems creating VMs with virt-manager on Centos 7.1

Problems creating VMs with virt-manager on Centos 7.1

July 21, 2015 By John Sloan Leave a Comment

This seems to have developed a couple of unhelpful quirks.

 

The first problem is that the default disk image file seems now to be qcow2, and there is no way to change this from the creation wizard.   The second problem is that it no longer names the disc image file after the name of the server being created – instead choosing to call them ‘rhel7.0.qcow2’ instead.  That’s not very helpful.

 

It is possible to work around these – by creating the storage beforehand (pick details instead of new, navigate to storage tab) and then using that to create the new VM, but it’s an unhelpful change of behaviour.

 

I get pushing qcow2 as a default, but not as the only option.   I guess many people create their vms more from the command line, so the wizard doesn’t get much love, but losing functionality in this way is disappointing.

Update 28/7

It seems that they have also changed the default cache option away from ‘none’ which makes you domains non-migratable!  This is a serious pain.

Update 26/8

I’ve now found the preference in virt-manager which lets you pick ‘raw’ as the default disc device for new systems.  It still wants to call them all rhel7.0.img and won’t let you customise it though, which is unhelpful.  At least when creating them by hand in the storage tab it defaults to raw.  Small mercies.

Leave a Reply Cancel reply

You must be logged in to post a comment.

IT Helpdesk

E-mail: helpdesk@eng.cam.ac.uk
Tel: 32686

  • Helpdesk enquiry form
  • Network connection request form
  • Feedback form

Recent news

AV Upgrades in LT0

September 29, 2016

AV Upgrade in Boardroom

September 1, 2016

AV Upgrades for Lent Term

January 12, 2016

ITX AV Expo 2015

November 3, 2015

LR4 AV System Upgrade

October 21, 2015

More News...

Recent blog posts

PaperCut Popup setup on Mac

October 25, 2017 By Anna Langley

AV Updates- Easter 2017

April 20, 2017 By Gavin MacKenzie

Security Awareness

June 14, 2016 By Caroline Blackmun

IMAP Issue still affects Outlook 2016

November 11, 2015 By Eleanor Blair

iscsi/CHAP notes

September 15, 2015 By John Sloan

More Blog Posts...

Contact

Engineering Department
Trumpington Street
Cambridge CB2 1PZ
United Kingdom (map)
Tel: +44 1223 748203
Fax: +44 1223 332662
E-mail: comp-admin@eng.cam.ac.uk

Information provided by:
webadmin@eng.cam.ac.uk

Privacy policy

Services

  • Administrative and information systems
  • Audio-visual facilities and support
  • Desktop services
  • Network and telephones
  • Linux System
  • Projects and system development
  • Server room facilities for research groups
  • User accounts and passwords

Support

  • IT Helpdesk
  • Computing help web pages
  • Divisional and research support
  • IT administration


© 2014 University of Cambridge

University A-Z
Contact the University
Freedom of information

About the University

How the University and Colleges work
Visiting the University
Maps
News
Jobs
Giving to Cambridge
Global Cambridge