I recently had a side conversation about including a Prometheus endpoint in the sidecar project, which would query virtual tables exclusively. Is it reasonable to require running the sidecar in addition to Cassandra when deploying on K8? My container knowledge is pretty limited.
If that's not a problem, I think it shouldn't be too hard to add, it's just a matter of someone finding the time. On Thu, Sep 19, 2019 at 1:39 PM Dimo Velev <dimo.ve...@gmail.com> wrote: > Hi, > > A docker image for Cassandra would be the first step in the right > direction. What one would really want is a kubernetes Operator that can > deploy, upgrade, etc. a Cassandra cluster ( > https://kubernetes.io/docs/concepts/extend-kubernetes/operator). > > A base image with placeholders would be neat for people to quickly start > using Cassandra. We have built our own image (actually a few of them over > the time) and also use it e.g. for cqlsh (docker run -it —rm —entrypoint > cqlsh <image> —help). What one would probably do in the end is building > their own image based on the official one adding a layer with the > configuration file, certificates, etc (or mounting them from a configmap in > kubernetes). > > Some things to consider for the image: > • Special care must be taken to make the image usable in OpenShift as it > does not run the processes in the containers as root. > • Logging should be changed to stdout so that it is easier to use and > automatically picked up by log indexers of kubernetes clusters. > • As for metrics, exposing Prometheus endpoint with them would be great as > this makes scraping them just a matter of meta configuration of the pods > (telling Prometheus the actual endpoint to scrape) > • I had issues with Cassandra binding on the wrong IP in a container > > Would be happy to help with the image part / testing on OpenShift. > > Cheers, > Dimo > > > On 19. Sep 2019, at 18:32, Nate McCall <zznat...@gmail.com> wrote: > > > > Hi Cyril, > > Thanks for bringing this topic up. I think it would be a good idea for us > > to have an "official" docker file in the source tree. > > > > There are, however, some caveats: > > > https://issues.apache.org/jira/browse/LEGAL-270?focusedCommentId=15524446&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-15524446 > > > > As long as we could adhere to those guidelines (which I don't see as > hard) > > we could do this. > > > > In looking through your specific image (thanks for posting this, btw), I > > would personally prefer something with a lot fewer dependencies > (basically > > from just our source tree) and a lot more replacement properties > available > > for config files. > > > > Curious what other folks think? > > > > Cheers, > > -Nate > > > >> On Wed, Sep 18, 2019 at 6:43 AM Cyril Scetbon <cyril.scet...@free.fr> > wrote: > >> > >> Hey guys, > >> > >> I heard that at the last summit there were discussions about providing > an > >> official docker image to run Cassandra on Kubernetes. Is it something > that > >> you’ve started to work on ? We have our own at > >> https://github.com/Orange-OpenSource/cassandra-image < > >> https://github.com/Orange-OpenSource/cassandra-image> but I think > >> providing an official image makes sense. As long as we can easily do > >> everything we do today. We could also collaborate. > >> > >> Thank you > >> — > >> Cyril Scetbon > >> > >> >
