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.
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