Yes, you can mix the approaches together. For instance, you can package in docker image: karaf runtime + cellar + your apps and then you mix Kubernetes with Cellar. It's the presentation I did while ago at ApacheCon.
Regards JB On Tue, Oct 4, 2022 at 7:12 AM Ephemeris Lappis <[email protected]> wrote: > > Hello. > > Thanks for your explanations. > > I understand that your 3rd choice is the only one to get multiple active > and synchronized instances. But can't I run them as PODs inside a > Kubernetes namespace, using deployments of an image based on > Karaf+Cellar, and then using the Jolokia API, for example, to deploy and > update my applications as features, targeting any one of the scaled > instances, and let Cellar synchronizing the other instances ? > > We already use Jolokia this way via Ansible playbooks to deploy > applications, as profiles instead of features, on Fuse clusters... > > Thanks again. > > Regards. > > Ephemeris Lappis > > Le 03/10/2022 à 18:36, Jean-Baptiste Onofré a écrit : > > Hi, > > > > In order: > > > > 1. Karaf HA Lock: you have one active, other instances are passive > > 2. Kubernetes: you can orchestrate start/stop of the Karaf docker > > image, but Kubernetes doesn't sync Karaf instances state (like config, > > feature installed, etc) > > 3. Cellar: sync Karaf instances together (you install one feature on > > one Karaf instance, the feature will be installed on other Karaf > > instances in the cluster) > > > > Regards > > JB > > > > On Mon, Oct 3, 2022 at 5:44 PM Ephemeris Lappis > > <[email protected]> wrote: > >> Hello. > >> > >> I've just looked at the presentation of Cellar. If I understand it > >> well, this presentation says that Cellar's main goal is for "big > >> clusters", allowing automatic synchronization between Karaf instances. > >> It seems to be really nice in the presentation :) ! > >> > >> On the other hand, the basic lock mechanism only provides an > >> active/passive solution. > >> > >> What should I prefer if my need is to provide both failover and load > >> balancing over a limited number of active instances, and not a "big > >> cluster". Today we use 6 Fuse Karaf instances distributed on 3 VM. Is > >> Cellar the right way, or did I miss something in the presentation ? > >> > >> Another thing : for other kinds of applications my customer manages > >> several Kubernetes clusters. So I suppose that if a containerized > >> solution is preferred, it should be running on Kubernetes, since all > >> the existing DevOps tooling is already based on it. > >> > >> The presentation focuses on Mesos/Marathon but also says that > >> Kubernetes is also an alternative solution. Right ? In this case, what > >> is the preferred way to package and deploy Karaf : just create a > >> custom Karaf+Cellar image (the same way the presentation shows), and > >> then create a Kubernetes deployment with the needed sizing and scaled > >> replicas ? > >> > >> Some examples perhaps ? > >> > >> Thanks in advance for your help. > >> > >> Regards. > > -- > Cet e-mail a été vérifié par le logiciel antivirus d'Avast. > www.avast.com
