What is Kubernetes?
Kubernetes is an open-source container management software developed in the Google platform. It helps you to manage a containerized application in various types of physical, virtual, and cloud environments.
It is a highly flexible container tool to deliver even complex applications. Applications 'run on clusters of hundreds to thousands of individual servers." It also allows you to manage your containerized application more efficiently.
In this tutorial, you will learn:
- What is Kubernetes?
- What is Docker?
- Features of Kubernetes
- Features of Docker
- Kubernetes vs. Docker Swarm
- Advantages of Kubernetes
- Advantages of Docker
- Disadvantages of Kubernetes
- Disadvantages of Docker
What is Docker?
Docker is an open-source lightweight containerization technology. It has gained widespread popularity in the cloud and application packaging world. It allows you to automate the deployment of applications in lightweight and portable containers.
It is computer software used for Virtualization. It also allows you to run multiple Operating systems on the same host. Virtualization in Docker is performed on the system-level in what is popularly called Docker containers.
Features of Kubernetes
Here are the essential features of Kubernetes:
- Offers automated scheduling
- Self-Healing capabilities
- Automated rollouts & rollback
- Horizontal Scaling & Load Balancing
- Provides a higher density of resource utilization
- Offers enterprise-ready features
- Application-centric management
- Auto-scalable infrastructure
- You can create predictable infrastructure
- Provides declarative configuration
- Deploy and update software at scale
- Offers environment consistency for development, testing, and production
Features of Docker
Here are the essential features of Docker:
- Isolated environments for managing your applications
- Easy Modeling
- Version control
- Placement/Affinity
- Application Agility
- Developer Productivity
- Operational Efficiencies
Kubernetes vs. Docker Swarm
| Parameters | Docker Swarm | Kubernetes |
| Developed by | Docker Inc | |
| Year Released | 2013 | 2014 |
| Scaling | No Autoscaling | Auto-scaling |
| Cluster Setup | Setting up the cluster is challenging & complicated. Cluster Strength is stronger. | Setting up the cluster is simple. Requires only two commands. Cluster Strength not as strong |
| Installation | Easy & fast | Complicated & time-consuming. |
| Data volume | Shares storage volumes between multiple containers in the same Pod. | Shares storage volumes with any other container |
| Support for logging and monitoring tool | Allows you to use a 3rd party tool like ELK. | It offers an in-built tool for logging and monitoring. |
| Load balancing | Does auto load-balancing | Manually configure your load balancing settings |
| Scalability | Scaling up is faster than K8S. But, it's cluster strength is not as robust. | Scaling up is slow compared to docker. However, guarantees stronger cluster state Load balancing needs manual service configuration. |
| Updates | Agent update can be performed in place. | A cluster can be upgraded in place. |
| Optimized For | Optimized for a single large cluster | Optimized for multiple smaller clusters of SDLC |
| Tolerance ratio | High fault tolerance | Low fault tolerance |
| Node Support | Supports 2000 > nodes | Supports up to 5000 nodes |
| Container Limit | Limited to 95000 container | Limited to 300000 containers |
| Public cloud service provider | Azure only. | Google, Azure, and AWS. |
| Slave | Worker | Nodes |
| Compatibility | Less extensive and customizable | More comprehensive and highly customizable |
| Community | An active user base which regularly updates the software. | Offers strong support from open source communities and big companies like Google, Amazon, Microsoft, and IBM |
| Large clusters | Speed is considered for the strong cluster states. | Offers container deployment and scaling, even in large clusters without considering the speed. |
| Companies using | Spotify, Pinterest, eBay, Twitter, etc. | 9GAG, Intuit, Buffer, Evernote, etc. |
| Github starts | 53.8 k | 54.1 k |
| Github forks | 15.5 k | 18.7 k |
Advantages of Kubernetes
Here, are pros/ benefits of using Kubernetes.
- Easy organization of service with pods
- It is developed by Google, who bring years of valuable industry experience to the table
- Largest community among container orchestration tools.
- Offers a variety of storage options, including on-premises SANs and public clouds.
- Adheres to the principals of immutable infrastructure
Advantages of Docker
Here, are significant cons/ benefits of using Docker container:
- Offers an efficient and easier initial set up
- Integrates and works with existing Docker tools
- Allows you to describe your application lifecycle in detail
- Docker allows the user to track their container versions with ease to examine discrepancies between prior versions.
- Simples configuration, interact with Docker Compose.
- Docker offers a quick-paced environment that boots up a virtual machine and lets an app run in a virtual environment quickly.
- Documentation provides every bit of information.
- Provides simple and fast configuration to boost your business
- Ensures that application is isolated
Disadvantages of Kubernetes
Here, are cons/ drawbacks of using Kubernetes container:
- Migrating to stateless requires many efforts
- Limited functionality according to the availability in the Docker API.
- Highly complex Installation/configuration process
- Not compatible existing Docker CLI and Compose tools
- Complicated manual cluster deployment and automatic horizontal scaling set up
Disadvantages of Docker
Here, are important cons/drawbacks of Docker container:
- Doesn't provide a storage option
- Offer a poor monitoring option.
- No automatic rescheduling of inactive Nodes
- Complicated automatic horizontal scaling set up
- All the actions have to be performed in CLI.
- Basic infrastructure handling
- Manual handling multiple instances
- Need support for other tools for production aspects - monitoring, healing, scaling
- Complicated manual cluster deployment
- No support of health-checks
Summary:
- Kubernetes is an open-source container management software developed in the Google platform.
- Docker is an open-source lightweight containerization technology.
- Kubernetes offers a feature of automated scheduling.
- Docker offers an isolated environment for managing your applications.
- Docker Swarm is developed by Docker Inc whereas Kubernetes is developed by Google.
- Kubernetes offers the Largest community among container orchestration tools.
- Docker offers an efficient and easier initial set up.
- The biggest drawback of Kubernetes is that it has a highly complex Installation/configuration process.
- The biggest drawback of Kubernetes is that it doesn't provide any storage option.
