Le mar. 4 févr. 2020 à 16:13, Daniel Walsh <dwalsh@redhat.com> a écrit :

On 2/4/20 9:04 AM, Laurent Pellegrino wrote:

I don't know about internals so it may not apply but regarding the use case I described briefly, I know what pod to update and what new image to use. Also, the image is available at the time the update must be performed.

Taking Kubernetes as an example [1], from a CLI point of view, I would see something like this:

> podman rolling-update PODNAME --image=IMAGE:TAG

Sure but you could script up the same thing.

podman pull images related to pod.

Then stop/destroy the pod/containers. Recreate the pod/containers.

I am not against your idea, but it brings in the Human element, I want to automate this process which is why I suggested a cron job.

In your case the admin needs to realize that one of the containers in the Pod uses an image that has been updated, and now triggers the service.

I would prefer to just have the system figure out whether an update is needed.
The main point is about updating the service/pod without an outage.

[1] https://kubernetes.io/docs/tasks/run-application/rolling-update-replication-controller/#updating-the-container-image
Le mar. 4 févr. 2020 à 14:46, Daniel Walsh <dwalsh@redhat.com> a écrit :
On 2/4/20 7:28 AM, Laurent Pellegrino wrote:

Thanks for the information.

Just to understand, why are you considering a periodic job?

We don't know when the image that the container is based on will be updated. So checking once a day seems like a reasonable thing to do. How else would you suggest we do this?
> This however would not maintain the the connections.

OK, so for now, the only solution seems to deploy a proxy that supports dynamic configurations with no restarts?

Le lun. 3 févr. 2020 à 19:28, Daniel Walsh <dwalsh@redhat.com> a écrit :

On 2/1/20 3:28 AM, laurent.pellegrino@gmail.com wrote:
> Hi there!
>
> I discovered Podman recently and started to use it as a great alternative to Docker.
>
> My question is about application updates. Let's say you have a pod running and you want to update the code for the app in that pod. Is there a simple manner to manage something similar to a Kubernetes rolling update? By rolling update, I mean performing an update with no service interruptions (i.e. starting a new pod running the new app version, switch the network traffic to the new pod and terminate the old pod).
>
> Kind Regards,
>
> Laurent Pellegrino
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We are actually investigating this workflow. But have not taken as far
as you want. The idea would be to be running a container, and then have
a job start periodically that would see if their was an update to the
image that the container was running on. It would pull the image down
and restart the container service, which would destroy the old container
and create a new container with the same params. This however would not
maintain the the connections.
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