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Kubernetes Vs Docker swarm

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Introduction

Managing the containerized apps is something that is becoming an extreme need and in fact a challenge for a lot of organizations. The fact is selecting a platform that can effectively manage them without creating further troubles is not at all an easy approach. There are many businesses which are struggling a lot in this matter. Well, the markets these days are flooded with some of the best container application management and scaling systems. This really doesn’t mean that they all can be put equal. Of course, they are different and there are certain factors that actually put them separate from one another. You might have no idea but the Kubernetes and Dockers warn are widely used. However, there are a lot of users who often get confused when it comes to selecting one among them. This post is a comparative study of Kubernetes and Docker swarm and you will find a lot of useful information about Kubernetes vs. Docker swarm in the below listed paragraphs.

Enthusiastic about exploring the skill set of Kubernetes? Then, have a look at the Kubernetes Training together additional knowledge. 

Swarm Vs Kubernetes

Kubernetes Overview

Kubernetes is basically an open-source platform that has excellent applications for automating the scaling, deployment, as well as managing the applications placed in the containers. This platform was actually introduced by the search engine Giant Google through a popular cluster management system. 

Related Page: Overview of Kubernetes

Kubernetes Architecture

The best thing about the Kubernetes is nothing but it’s the architecture that attracted the attention of a very large number of experts towards it. Because it was largely based on Borg, the management of all the applications could be done in a short span of time. When it comes to cluster, users can find a very large number of components associated with the same. A few of the components include 

  • Controller Manager
  • API Server
  • Etcd
  • Kubelet
  • Scheduler

Useful components 

These components are responsible for performing different tasks based on a number of factors. The Controller manager is responsible for moving the workloads up and down. Generally, it is opted for matching the desired state with the current state.  The API server on the other side is generally regarded as one of the strongest hubs for managing various tasks and plays a significant role in the utilization of master node. In addition to this, it is also responsible for enabling the communication among the other components which are a part of the cluster. The configuration data is stored by the etcd. The pod specifications are controlled and received from the other servers by the Kubelet. Placing the component which is useful for a specific node is done by the scheduler. In addition to this, there is another special component called as aster.  It is nothing but the aster node which is responsible for placing the workloads in the nodes.

Components of Kubernetes Vs Docker Swarm

Important facts and terms associated with Kubernetes

In Kubernetes there are a lot of things that are important for the users and the learners to understand in order to get the results in their favor. Understanding them is not at all a big deal. The following are some of them to let you keep up the pace simply. 

  • Deployments
  • Pods
  • Labels
  • Services

There is always a need for the creation of some strong pods. In addition to this, they are also required to be managed. These pods are generally regarded as Deployments. These deployments can be used in a conjunction with other components depending on their availability with the network. The pods are nothing but actually a group of containers that generally run on the same node as the master node. There are a lot of resources that can be shared and some of the best examples include that kernel, file systems, as well as the sharing of the IP address. There are some pairs which are attached to the objects and users are free to utilize them for the purpose of updating and searching a number of other objects in a single search. Such pairs are generally regarded as Labels. There are a lot of requests that are made among the different pods and they can easily be considered by the services. A special DNS server could be assigned for this task depending on the complexity of the services. They can be called as the new face of the existing file system. 

Related Page: Kubernetes Deployment Vs Kubernetes Services

Docker Swarm Overview

It is basically an approach that is useful for enabling the users to deploy and manage the containers very easily in a special mode known as swarm mode. There is a Docker engine deployed on different nodes and its prime task is to maintain the orchestration environment. With the help of some special features, it is possible to maintain cluster management. There are nodes which are tagged as worker nodes. They generally execute and receive tasks from the other nodes known as manager nodes. All the services are specified declaratively. This is because there are certain special tasks that can only be run in the swarm nodes. It is possible to duplicate the services so that they can be run on more than one node at the same time. In this model, server has to make sit sure that the services remain available to all the users without any error.

Related Page: Orchestration in the Docker

Architecture of the Docker Swarm

The architecture generally consists of a group of managers and workers. The desired state of the services running in the environment can be specified by the user anytime. this is one of the best thing about the Docker Swarm. The concerned task is largely based on the YAML files.

Architecture of Docker Swarm

Important facts and terms associated with Docker Swarm

Just like Kubernetes, Docker Swarm also has some of the key terms associated with it. It is always beneficial to understand them to get the things done in a rightful manner. These terms are spotlighted below to enable you to keep up the pace simply with them.

  • Manager Node
  • Service
  • Node
  • Worker Node
  • Swarm
  • Task

The service definitions are generally received by the Manager nodes. The source of the same is users. After processing the concerned information, they process the information among different work nodes. Under special cases, it is possible to deploy the manager nodes to work on behalf of the worker nodes. There are situations when there is a need to create replicas of the files or the information. The same task is handled by the Service in Docker Swarm. Node is the sub-division of the swarm and they can be combined to define the specific actions of the work going on. The manager mode distributes the tasks to the worker node and they are responsible for processing the same. Swarm is generally a group of nodes that is responsible for the processing of tasks. They can be in the public cloud environments. Lastly, a task can be defined as the smallest part of a service.

Check Out Kubernetes Tutorials

Features of Kubernetes and Docker Swarm

  • In the Kubernetes environment, it is possible to deploy the applications through a combination of pods as well as the services. Generally, a pod is defined as a cluster of any size that contains the containers and is the smallest action taken for a deployment process. On the other side, applications can be deployed as services in the Docker environment.
  • In Docker, all the important tasks are defined by the YAML files which is not applicable in case of Kubernetes
  • The tasks are generally distributed in the data centers in case of Docker while the deployment has multiple replicas across the nodes used

Application scalability

  • Generally, the pods define the application tier in the Kubernetes. The application can only be scaled when the same is fully managed by the deployment. On the other side, there is no such restriction like this in the Docker Swarm.
  • The scaling can be automated or it can be manual in Kubernetes and the same is also possible in case of Docker
  • The vertically integrated applications cannot be run in the Docker while Kubernetes can easily run the same without any restriction.

Load balancing

  • The services can be utilized in case of Kubernetes for exposing the pods and it is also possible to deploy them as a load-balancer. However, it is to be done only inside a cluster associated with the task. For load balancing, ingress can be used. In the Docker environment, it is actually done through a DNS component which is present in the Swarm mode. In this, the users specifies the services that run on the port

Application scaling

  • A number of pods are required in case of Kubernetes when it comes to auto-scaling. On the other side, Docker can perform the same task through a limited number of pods. However, they are not directly available. It is necessary to declare the service for each pod.
  • Upon up and down scaling the Swarm manager can automatically remove or adopt the important tasks which in not possible in case of Kubernetes

This is a comparative study of both Docker Swarm and Kubernetes. Both have their own pros and cons associated with them. It is actually nothing but the features that put them separate from one another. There are some features that can directly be accessed within the Kubernetes environment. However, the same features need some extra time in Docker but the results of both these platforms are appreciable for the long run.