"Using Docker Swarm when running Zookeeper"? about zookeeper-docker HOT 5 CLOSED

Is there any update on this? I'm keen to run a zookeeper ensemble across a Docker Swarm. It's unclear how to set the required variables (ZOO_MY_ID, ZOO_SERVERS) when deploying a stack either globally or using replicas. Any feedback would be much appreciated.

from zookeeper-docker.

The solution for dynamic scaling will be pretty complicated. You would have to use Consul as a service registry and Consul Template to change Zookeeper configuration when new container is added or an existing container removed. And then you also have to restart all your Zookepers because prior to version 3.5 it doesn't support dynamic reconfiguration.

A similar solution for scaling Nginx is described in this article.

But it general it seems like dynamic scaling isn't that useful for Zookeeper for several reasons

1. It doesn't scale for writing. In fact addind new nodes increase reliability at the cost of write speed.
2. Usually you decide how many node failures you'd like to tolerate in advance. And often it's no use of running more than 5 nodes.

from zookeeper-docker.

I guess that's what folks from Bandsintown did in their fork.

from zookeeper-docker.

Implementing dynamic scaling has become a bit easier with the introduction of the 3.5.3-beta tag. Because starting from 3.5 Zookeeper now supports dynamic reconfiguration.

from zookeeper-docker.

Closing it because the issue seems to be inactive for quite some time now.

from zookeeper-docker.