RHEL Universal Base Image

[Richard Powell]

Has anyone in the Singularity group investigated RHEL UBI for use with Singularity containers?
https://www.redhat.com/en/blog/introducing-red-hat-universal-base-image

[David Godlove]

Just looked at it.  Wow!  This fills a big gap.

Looks like their registry is OCI compliant so the following works out of the box:

vagrant@vagrant:~$ singularity pull docker://registry.access.redhat.com/ubi8/ubi:latest

INFO:    Starting build...

Getting image source signatures

Copying blob sha256:787f47dbeaac926cc8c927a48e8a84fc97e05fbd1c08a4c9c4ddcaddfd87e2f7

 67.66 MiB / ? [-----=----------------------------------------------------] 11s

Copying blob sha256:6a5240d60dc4e1ade0d103badb2a897e8103ebf0ebe08350cd582bbc9671cc7a

 1.45 KiB / ? [-----------------------------------------=------------------] 0s

Copying config sha256:c7ecba346988e47e2a78ecaf25f7cbe834f161ffd9d7c807600cb297f157ee06

 1.98 KiB / 1.98 KiB [======================================================] 0s

Writing manifest to image destination

Storing signatures

INFO:    Creating SIF file...

INFO:    Build complete: ubi_latest.sif

vagrant@vagrant:~$ singularity shell ubi_latest.sif

Singularity ubi_latest.sif:~> cat /etc/redhat-release

Red Hat Enterprise Linux release 8.0 (Ootpa)

Would be interested to know about use cases.

On Fri, May 10, 2019 at 6:17 AM Richard Powell <blacksbu...@gmail.com> wrote:

Has anyone in the Singularity group investigated RHEL UBI for use with Singularity containers?
https://www.redhat.com/en/blog/introducing-red-hat-universal-base-image

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[Hugo R Hernandez]

Cool!

First check... partially work - well, haven't check anything about RHEL8 so could be errors due to CentOS7 vs RHEL8:

[me@host ~] singularity run /singularity/test/ubi_latest.sif cat /etc/redhat-release

Red Hat Enterprise Linux release 8.0 (Ootpa)

[me@host ~] singularity shell /singularity/test/ubi_latest.sif

bash: hostname: command not found  <<<< definitions on my .bashrc to use hostname...

Singularity ubi_latest.sif:~> hostname

bash: hostname: command not found

bash: hostname: command not found

Singularity ubi_latest.sif:~> ip addr show

bash: ip: command not found

bash: hostname: command not found

Our team started discussion about the arriving of RHEL8 then CentOS8... a good test could be via Singularity!

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[Richard Powell]

Our company is heavy on RHEL and we have a group designing an app on our RHEL cluster.  They need to deliver the app to a customer and I had steered them to CentOS Singularity container.  We may now see Singularity/UBI as a better fit.

 I've been test RHEL8 beta as our next gen cluster OS.  I suspected Red Hat was sitting on the release until IBM deal was a go.  Within 24 hrs of DOJ approval, it was released.  I'll have opportunity to test this RHEL8/UBI as well.

Keep me posted on any findings and I'll do the same.

Richard

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