kubernetes VS Apache ZooKeeper

Kubernetes and Helm for deployment

3 .Learn about containerization and orchestration tools such as kubernetes and docker

It is cross-platform and therefore able to be installed on any of Windows / Mac / Linux. This must be one of their advantages. Supposed that some files defining a virtual machine or a pod (of Kubernetes) for grouping ones are delievered, we can develop on the same virtual enviroment with defferent workstations.

Docker is a DevOps containerization service that separates your code from the infrastructure it depends on. Docker is often coupled with Kubernetes, which helps you rapidly deploy, scale and manage your containers. Together, they administer rapid software delivery and take care of its scaling.

Kubernetes is an Open Source container orchestration system. Kubernetes' API provides a uniform control layer for managing containerized services. There is a lot of great material available that explains what Kubernetes is. See Further Reading at the end for some suggestions.

If it's not something you can figure out from kubernetes.io, then its not something that you have to worry about being on the test.

Intermediate knowledge of Flux, Kustomize and K8s

There's been a highly annoying kubectl port-forward heisenbug open for several years which smells an awful lot like one of these dark Go network layer corners. You get a good connection establish and some data flows, but at some random point it decides to drop. It's not annoying enough for any wizards to fix.

https://github.com/kubernetes/kubernetes/issues/74551

Well, like I said, I'm building a harvester/k8s cluster. So, the idea being that if one of the machines is busy or goes down, an other part of the cluster can pick up the slack. Basically, the 'Voltron' of computing, many pcs come together to form a more 'powerful' system. I can do this with any pc, but minis are good for homelabbing because they're cheap, don't take that much space, aren't that power hungry, and they still are powerful enough to run 90% of anything I throw at it, that isn't graphic intensive.

You can install Kafka from https://kafka.apache.org/quickstart. Because Druid and Kafka both use Apache Zookeeper, I opted to use the Zookeeper deployment that comes with Druid, so didn’t start it with Kafka. Once running, I created two topics for me to post the data into, and for Druid to ingest from:

Please note that we use Zookeeper as the Governance Center.

Next, review deployment complexity such as DB-less versus database-backed deployments. For example, Kong does require running Cassandra or Postgres. Apigee requires Cassandra, Zookeeper, and Postgres to run, while other solutions like Express Gateway and Tyk only require Redis. Apache APISIX uses etcd as its data store, it stores and manages routing-related and plugin-related configurations in etcd in the Data Plane.

ZooKeeper, a system for coordinating distributed nodes, similar to Google's Chubby

ElasticJob achieves distributed coordination through ZooKeeper. In practical scenarios, users may start multiple jobs in the same project simultaneously, all of which use the same Apache Curator client. There are certain risks due to the nature of ZooKeeper and the callback method of Curator in a single event thread.

For now we just need to know that Kafka will be running n brokers acting as a cluster. The Kafka cluster will use Zookeeper to orchestrate the brokers.

We spin up a Zookeeper instance at port 2181 internally within the Docker network (i.e. not accessible from the host)

To solve this issue we can use a distributed system manager such as Zookeeper which can provide distributed synchronization. Zookeeper can maintain multiple ranges for our servers.

Support the deployment of the ZooKeeper cluster through Bitnami.