For the OP - IBM appears to have some relevant info in their CEPH docs: 

https://www.ibm.com/docs/en/storage-ceph/5?topic=cluster-performing-disconnected-installation


Questions: 

Is it possible to reset “container_image” after the cluster has been deployed? 

sudo ceph config dump |grep container_image
global                                                        basic     
container_image                        
quay.io/ceph/ceph@sha256:aca35483144ab3548a7f670db9b79772e6fc51167246421c66c0bd56a6585468
  * 


And, can it be set using just the repo name (quay.io/ceph/ceph:v18.2.1)  or is 
it going to, under the covers, change it over to the Image ID 
(quay.io/ceph/ceph@sha256:aca3548 <http://quay.io/ceph/ceph@sha256:aca3548>…)


Questionable Use Case — having a cephadmin managed cluster that has more than 
one architecture — in my case, arm64 and amd64. Maybe not best practice for 
production, but possibly useful for dev/test and/or migration from one 
architecture to another. 



> On Jan 25, 2024, at 1:46 PM, Kai Stian Olstad <ceph+l...@olstad.com> wrote:
> 
> On 25.01.2024 18:19, Marc wrote:
>> More and more I am annoyed with the 'dumb' design decisions of redhat. Just 
>> now I have an issue on an 'air gapped' vm that I am unable to start a 
>> docker/podman container because it tries to contact the repository to update 
>> the image and instead of using the on disk image it just fails. (Not to 
>> mention the %$#$%#$ that design containers to download stuff from the 
>> internet on startup)
>> I was wondering if this is also an issue with ceph-admin. Is there an issue 
>> with starting containers when container image repositories are not available 
>> or when there is no internet connection.
> 
> Of course cephadm will fail if the container registry is not available 
> avaiable and the image isn't pulled locally.
> 
> But you don't need to use the official registry, so using it air-gaped is not 
> a problem.
> Just download the images you need to your local registry and specify it, some 
> details are here
> https://docs.ceph.com/en/reef/cephadm/install/#deployment-in-an-isolated-environment
> 
> The containers themself don't need to download anything at start.
> 
> 
> -- 
> Kai Stian Olstad
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