JiscMail Logo
Email discussion lists for the UK Education and Research communities

Help for TB-SUPPORT Archives


TB-SUPPORT Archives

TB-SUPPORT Archives


TB-SUPPORT@JISCMAIL.AC.UK


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

TB-SUPPORT Home

TB-SUPPORT Home

TB-SUPPORT  December 2018

TB-SUPPORT December 2018

Options

Subscribe or Unsubscribe

Subscribe or Unsubscribe

Log In

Log In

Get Password

Get Password

Subject:

Re: Building Singularity Containers

From:

Alessandra Forti <[log in to unmask]>

Reply-To:

Testbed Support for GridPP member institutes <[log in to unmask]>

Date:

Thu, 6 Dec 2018 14:05:49 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (154 lines)

On 06/12/2018 14:03, Alessandra Forti wrote:
> Hi Gareth,
>
> On 06/12/2018 13:40, Gareth Roy wrote:
>> Hi,
>>
>> So having now fallen down the rabbit hole of singularity again (it's 
>> been a while since I dived into the docs), has anyone got experience 
>> with Singularity 3.0?
>>
>> It appears to be a complete re-write in go and has a number of 
>> differences to the 2.X version we've been using on the grid (I'm 
>> assuming as it's the commercial offering). Site is here:
>>
>> https://www.sylabs.io/docs/
>>
>> rather than:
>>
>> https://singularity.lbl.gov/
>>
>> The page which is very shiny, has some slightly disturbing text for 
>> the way we use containers on the Grid at the moment, for instance 
>> rpm's appear to be only for the pro version as does 
>> streamlined/preferred security updates....and the image format has 
>> changed again with the selling point that it's a single monolithic 
>> entity rather than cached layers or a simple directory -
>>
>>   "Singularity can take any OCI compatible format and encapsulate it 
>> into a “Singularity Image Format” (SIF) package. This package now 
>> becomes the runtime format for the container. No more tarballs. No 
>> more root owned layers or daemons, this is the runtime executable 
>> format!"
> nothing has changed from this point of view. Even before the rpms 
> circulating weren't produced by the singularity team. WLCG has 
> produced rpms for the past year. The image if you build it like I 
> built it in my other reply is monolythic, it has always been 
> singularity selling point to run as an unprivileged monolitic 
> executable. That is why we adopted it on the grid.
or unpacked in CVMFS as it happens.
>
> If anything the fact that they are more OCI compatible it is a good 
> thing. It means there will be less problems for the users when they 
> build for example on docker and use the image with singularity.
>>  From the docs it looks like you can still us a "sandbox" mode in 
>> which the container  is in a directory, but this seems to be assumed 
>> to be for development etc.
> I don't think anything has changed much for sandboxing. Though I don't 
> think anyone has tried yet. I'm waiting for some more ironing out of 
> problems after the complete rewrite.
>
> cheers
> alessandra
>>
>> Does anyone have any experience with this version, or how compatible 
>> it is with how we do things?
>>
>> Thanks,
>>
>> Gareth
>>
>>
>>
>> On 06/12/2018, 12:12, "Testbed Support for GridPP member institutes 
>> on behalf of Waugh, Ben" <[log in to unmask] on behalf of 
>> [log in to unmask]> wrote:
>>
>>      Hi Chris,
>>           I went to a talk recently by someone who had been trying 
>> out Singularity
>>      and was similarly confused to start with. I think root (or sudo) 
>> access
>>      is needed in order to create a container, but that it can then 
>> be run
>>      without root access. So a user who is not trusted by you, but 
>> has root
>>      access on e.g. their own laptop, can create an image and run it 
>> on your
>>      system.
>>           Cheers,
>>      Ben
>>           On 06/12/2018 12:04, Chris Brew - UKRI STFC wrote:
>>      > Hi All,
>>      >
>>      > As is often the case, I am confused. Specifically today, I am 
>> confused about about Singularity Containers.
>>      >
>>      > A bit of background; I’ve been getting several requests in 
>> from different people saying “I want version X.Y.Z of 
>> root|Python|gcc|whatever, and your version of CentOS/SL only has 
>> A.B.C”. Now there are various ways of satisfying people 
>> (/cvmfs/software.cern.ch is a very good resource) but this sounded 
>> like an ideal use case for containers.
>>      >
>>      > I’ve gone off and looked at the Singularity documentation and 
>> although it makes a big thing of “Untrusted images from untrusted 
>> users” all the example commands for building images start with ‘sudo 
>> singularity…’
>>      >
>>      > So, can users build their own images without sudo or is their 
>> definition of an “untrusted” user different to mine?
>>      >
>>      > The second related thing I’m confused about is the different 
>> image formats, I cannot seem to find a comparison between them with 
>> pros and cons. And on that is there a specific issue with images that 
>> need loopback devices?
>>      >
>>      > Yours,
>>      > Chris.
>>      >
>>      > --
>>      > Dr Chris Brew
>>      > Scientific Computing Manager
>>      > Particle Physics Department
>>      > UKRI - STFC - Rutherford Appleton Laboratory
>>      > Harwell Oxford,
>>      > Didcot
>>      > OX11 0QX
>>      > +44 1235 446326
>>      >
>>      >
>>      > 
>> ########################################################################
>>      >
>>      > To unsubscribe from the TB-SUPPORT list, click the following 
>> link:
>>      > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=TB-SUPPORT&A=1
>>      >
>>           --
>>      Dr Ben Waugh                                   Tel. +44 (0)20 
>> 7679 7223
>>      Computing and IT Manager                       Internal: 37223
>>      Dept of Physics and Astronomy
>>      University College London
>>      London WC1E 6BT
>> ########################################################################
>>           To unsubscribe from the TB-SUPPORT list, click the 
>> following link:
>> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=TB-SUPPORT&A=1
>>
>>
>> ########################################################################
>>
>> To unsubscribe from the TB-SUPPORT list, click the following link:
>> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=TB-SUPPORT&A=1
>

-- 
Respect is a rational process. \\//
For Ur-Fascism, disagreement is treason. (U. Eco)

########################################################################

To unsubscribe from the TB-SUPPORT list, click the following link:
https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=TB-SUPPORT&A=1

Top of Message | Previous Page | Permalink

JiscMail Tools


RSS Feeds and Sharing


Advanced Options


Archives

December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
May 2018
April 2018
March 2018
February 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006
April 2006
March 2006
February 2006
January 2006
December 2005
November 2005
October 2005
September 2005
August 2005
July 2005
June 2005
May 2005
April 2005
March 2005
February 2005
January 2005
December 2004
November 2004
October 2004
September 2004
August 2004
July 2004
June 2004
May 2004
April 2004
March 2004
February 2004
January 2004
December 2003
November 2003
October 2003
September 2003
August 2003
July 2003
June 2003
May 2003
April 2003
March 2003
February 2003
January 2003
December 2002
November 2002
October 2002
September 2002
August 2002
July 2002
June 2002
May 2002
April 2002
March 2002
February 2002
January 2002


JiscMail is a Jisc service.

View our service policies at https://www.jiscmail.ac.uk/policyandsecurity/ and Jisc's privacy policy at https://www.jisc.ac.uk/website/privacy-notice

Secured by F-Secure Anti-Virus CataList Email List Search Powered by the LISTSERV Email List Manager