Knoldus Blogs

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𝐆𝐨𝐨𝐠𝐥𝐞 𝐊𝐮𝐛𝐞𝐫𝐧𝐞𝐭𝐞𝐬 𝐄𝐧𝐠𝐢𝐧𝐞 (GKE) – Deploy an Application to the Cluster

September 18, 2021September 27, 2021Cloud, cluster, Kubernetes, Studio-DevOps, Tech Blogs, Web Applicationapplication, cluster, deployment, GKE, google, Google Kubernetes Engine, kubernetes

Reading Time: 3 minutes Introduction to Kubernetes Kubernetes is an open-source container orchestration platform (Originally developed by Google) designed to automate the deployment, scaling, and management of containerized applications. Kubernetes makes it easy to deploy and operate applications in a microservice architecture. What is GKE? Google Kubernetes Engine is a Management and orchestration way for Containers. The goal of GKE is to increase the potency of DevOps and development teams by comprising Continue Reading

Set-up Kafka Cluster On GCP

July 19, 2021July 19, 2021Apache Kafka, Cloud, cluster, Functional Programming, Java

Reading Time: 4 minutes In this article, we are going to create Kafka Clusters on the GCP platform. We can do it in various ways like uploading Kafka directory to GCP, creating multiple zookeepers, by creating multiple copies of the server.properties file, etc. But, In this article, we are doing it in a simpler way i.e. by Creating a Kafka Cluster (with replication). Let’s Start… What is GCP? GCP Continue Reading

Apache Cassandra: Back to Basics

June 30, 2021June 30, 2021Cassandra, cluster, Studio-Scala, Tech Blogsapache cassandra, clustering in cassandra, Partitioning in cassandra, ring topology

Reading Time: 5 minutes Apache Cassandra has made its mark in the world of NoSQL Databases. Its features like Partitioning, Clustering, and Ring topology make it unique.

Building Stateful Systems with Akka Cluster Sharding

February 17, 2021February 17, 2021Akka, akka-streams, cluster, Tech Blogs

Reading Time: 5 minutes This post was written in collaboration with Lightbend, a Knoldus’ Partner. Most microservices applications are stateless, which means they delegate persistence and consistency to a database or external storage. But sometimes there’s a benefit to keeping state inside the application. If you’ve worked with data storage systems long enough, you are bound to bump into the term “sharding“. Sharding is another word for partitioning and Continue Reading

How to audit DC/OS Services?

December 31, 2020December 31, 2020cluster, DCOS, Prometheus, Security, Security Audit, Studio-DevOps, Tech BlogsAudit, dc/os services, dcos-cluster

Reading Time: 4 minutes DC/OS is a distributed systems kernel that lets you manage multiple machines as if they were a single computer. Its included web interface facilitates user to interact with its services. Now, this is where it gets quite messy to keep track of the users who are interacting with the services running in the cluster. It is the responsibility of the cluster-admin to keep track and Continue Reading

Rebalancing in Akka Cluster Sharding

December 29, 2020December 29, 2020Akka, cluster, Lightbend, Reactive Architecture, Studio-ScalaAkka, akka-cluster-sharding, cluster sharding, Lightbend CoE

Reading Time: 4 minutes In this blog we will be discussing about one of the important feature of Akka Cluster Sharding which is Rebalancing. Before moving forward make sure you have some basic knowledge on Akka Cluster Sharding, if not then please read Introduction to Akka Cluster Sharding and Implementing Akka Cluster Sharding. Before directly diving into this amazing feature which akka sharding provides, lets first understand the need Continue Reading

Akka Cluster in use (Part 9): Effectively Resolving Split Brain Problem

July 26, 2020July 26, 2020Akka, cluster, Studio-Scalaakka-cluster, split-brain, split-brain-resolver

Reading Time: 7 minutes We can deal with cluster failures manually, as mentioned in our blog post Manually Healing an Akka Cluster. However, it requires a DevOps engineer to be available 24 x 7. This process is very expensive and can be very frustrating (sometimes). Hence, we really need a way via which we can resolve cluster failures in an automated fashion. This is where a Split Brain Resolver Continue Reading

Akka Cluster in use (Part 8): What is a Split Brain?

July 18, 2020July 18, 2020Akka, cluster, Studio-Scalaakka-cluster, akka-cluster-sharding

Reading Time: 5 minutes In our previous blog post, Manually Healing an Akka Cluster, we have already seen that if we do not handle the failures in an Akka Cluster carefully, then it can lead to disastrous situations like Split Brain. Hence, in this blog post we will learn more about the consequences of the Split Brain problem. What is Split Brain? Split Brain is a destructive condition of Continue Reading

Akka Cluster in use (Part 7): Manually Healing an Akka Cluster

June 27, 2020June 27, 2020Akka, clusterakka-cluster, akka-http-management, akka-management

Reading Time: 4 minutes In our previous blog post, Understanding Failures in Akka Cluster, we came to know how an Akka Cluster reacts in case of a failure and what are the reasons behind the failures. Now, whenever a failure will occur in an Akka Cluster, we would need a way to heal the cluster, so that we can restore it back to its normal working condition. Hence, in Continue Reading

Akka Cluster in use (Part 6): Understanding Failures in Akka Cluster

June 21, 2020June 21, 2020Akka, clusterakka-cluster, failure

Reading Time: 4 minutes Ideally we would never want our Akka Cluster(s) to fail. Instead we would like to keep them running in a perfect condition. But in real world failures are unavoidable and can be of many types. Like network failures, application failures, and many more. So let’s understand how an Akka Cluster reacts in case of a failure and what are the reasons behind the failures. Changes Continue Reading

What, Why, and How Cloudstate?

June 19, 2020June 19, 2020Cloudstate, cluster, Docker, Event Sourcing, Studio-Scalaakka-cluster, cloud computing, Introduction, lightbend, serverless, serverless computing, technology

Reading Time: 4 minutes This article talks about the Lightbend’s Cloudstate which is used for serverless computing.

Orchestration With Docker-Swarm

June 4, 2020June 4, 2020cluster, Docker, Studio-DevOps, Tech BlogsDevops, docker, docker service, docker-machine, docker-swarm, orchestration, swarm demo, Swarm-Architecture

Reading Time: 6 minutes The world is constantly being attracted towards containers and its orchestration especially in large and dynamic environments which has also led to the rising of various tools and platforms in trend.Yes, we will be looking at Docker-Swarm and some of its key components !!! As we all know that Docker is a major player in the world of containers and therefore in this blog, we Continue Reading

Akka Cluster in use (Part 5): Let’s stay in touch via Gossip

May 31, 2020May 31, 2020Akka, cluster, Tech Blogsakka-cluster

Reading Time: 3 minutes In our previous blog post, Managing an Akka Cluster, we learnt how to manage an Akka Cluster via Akka Management. In this blog post, we are going to learn, how the Node(s) within an Akka Cluster communicate with each other via Gossip Let’s Gossip A very popular way to transmit a message is via Gossip 😛 . As it doesn’t need much effort and also Continue Reading