DOCKER SWARM AND KUBERNETES

Docker Swarm and Kubernetes
29- MARCH-2024

INTRODUCTION

Docker is a tool that's positioned between developers and operational personnel. Developers can hand over to the operation team an application for testing, staging, or production. Docker Swarm is for natively managing a cluster of Docker Engines called a swarm. Kubernetes is a powerful and widely used open-source platform for managing containerized workloads and services.

What is Docker Swarm?

A Docker Swarm is a container orchestration tool running the Docker application. Swarm mode is an advanced feature for managing a cluster of Docker daemons. Use the Docker Engine CLI to create a swarm of Docker Engines where you can deploy application services. The activities of the cluster are controlled by a swarm manager, and machines that join the cluster are referred to as nodes.

A Docker Swarm is a group of either physical or virtual machines that are running the Docker application and that have been configured to join together in a cluster.

Docker Swarm has two types of services: replicated and global.

What is Docker Swarm used for?

In a Docker Swarm, there are many nodes and at least one manager node to manage all these worker nodes' resources efficiently and ensure that the cluster operates without any error.

Instead of handling differentiation between nodes at deployment time, the Docker Engine handles any specialization at runtime. You can deploy both kinds of nodes, manager and workers, using the Docker Engine.

Docker Engine uses a declarative approach to let you define the desired state of the various service in your application stack. You can declare the number of tasks you want to run.

You can expose the ports for services to an external load balancer.

What is Kubernetes?

Kubernetes is a powerful and widely used open-source platform for managing and it is a portable and extensible platform that facilitates declarative configuration and automation. Its services, support, and tools are widely available and have rapid growing ecosystem.

What is Kubernetes used for?

Containers are an excellent way to bundle and run your applications but they require management. Kubernetes is the de-facto standard for container management. It provides services like deploying, scaling, and managing containerized applications.

It makes it easy to scale up or down your application as needed. It enables high availability by automatically, restarting containers that fail, rescheduling containers on other nodes if a nodes go down.

Kubernetes uses a declarative approach to configuration.

Kubernetes automates many tasks such as rolling our updates, scaling and self-healing. It eliminates manual intervention, reducing likelihood of human error.

Kubernetes is portable platform that runs on any clouds or hybrid environment. It has a large and rapidly growing ecosystem with many tools and services available.

Kubernetes provides built-in mechanisms for ensuring that applications are always available. It provides a flexible platform for deploying and managing applications.

Comparison:

Docker Swarm emphasizes simplicity, making it user-friendly, particularly for Docker-savvy individuals. Its architecture, featuring manager and worker nodes, is straightforward. Scaling entails horizontal service replication, offering basic scalability. While it ensures high availability through service duplication, it may lack some advanced fault tolerance features found in Kubernetes. Nevertheless, its integration with the broader Docker ecosystem makes it ideal for smaller deployments or Docker-centric organizations.

In contrast, Kubernetes offers robustness and scalability, managing containerized workloads across nodes. It provides advanced features such as automatic scaling and extensive fault tolerance. Its architecture is more intricate, necessitating a deeper understanding for setup and management. However, with its expansive ecosystem and community support, Kubernetes excels in handling complex, scalable deployments.

Conclusion :

Kubernetes and Docker are considered to be best-in-class tools and two are the most popular container orchestration solutions. Kubernetes is a container orchestration system that manages multiple containers. Docker Swarm does not manage any containers but instead is a cluster manager for Docker containers. Kubernetes offers more advanced scaling tools than Docker. Compared to Docker Swarm, Kubernetes has more complex installation and require manual effort. It doesn't provide automatic scaling.

Docker Swarm has a high availability as you can easily duplicate the microservices in Docker Swarm and has faster deployment time. Kubernetes is by nature highly available, fault tolerant, and self healing. It also provides automatic scaling and can replace faulty pods.

SOURCE URL-https://docs.docker.com/engine/swarm/

https://www.sumologic.com/blog/kubernetes-vs-docker/

https://www.sentinelone.com/cybersecurity-101/what-is-kubernetes/?utm_source=gdn-paid&utm_medium=paid-display&utm_campaign=can-pmax-cloud-launch-ppc&utm_term=&campaign_id=20183238684&ad_id=&gad_source=1&gclid=CjwKCAiAgeeqBhBAEiwAoDDhnzfOJmjosmi3mmeQSAJPJmrti0Ia6S1rdS0EC4KD7813qkV17lCwUxoCAdkQAvD_BwE

https://www.knowledgehut.com/blog/devops/docker-swarm-vs-kubernetes#:~:text=The%20main%20difference%20is%20that,whereas%20Docker%20Swarm%20does%20not.

https://circleci.com/blog/docker-swarm-vs-kubernetes/

            Sahil Hantaal
             Id:C0883928