Docker

Docker

Docker is a centralized platform for packaging, deploying, and running applications.Before Docker, many users faced the problem that a particular code was running in the developer’s system but not in the user’s system. Therefore, the main reason for developing Docker is to help developers easily develop applications, ship them into containers, and deploy them anywhere.

It is firstly released in March 2013. It is used in the deployment phase of the software development life cycle, that is why it can efficiently solve problems related to application deployment.

Advantage of Docker:

  • It provides lightweight virtualization.
  • It runs the container in seconds instead of minutes.
  • It does not require a full operating system to run the application.
  • It uses application dependencies to reduce the risk.
  • Docker allows you to use a remote repository to share your containers with others.
  • It provides continuous deployment and testing environment It uses less memory.
  • It uses less memory.

Disadvantages Of Docker :

  • It is difficult to manage large amounts of containers in Docker.
  • Some features such as container self-registration, container self-inspection, copying files from host to container, and more are missing in Docker.
  • Docker provides cross-platform compatibility. This means that if an application is designed to run in a Docker container on Windows, it may not run on Linux or vice versa.
  • It increases complexity due to an additional layer.

Read Also- What is HashiCorp Vault and how does it work?

Docker features:

Docker

1)Application Isolation:

Docker provides containers that are used to run applications in an isolated environment. Since each container is independent, Docker can execute any type of application.

warm is a clustering and scheduling tool for Docker containers. On the front end, it uses the Docker API, which helps us use various tools to control it.  It is a self-organizing group of engines that enables pluggable backends.

2)Increase in productivity:

It helps increase productivity by simplifying technical configuration and deploying applications faster. Furthermore, it not only provides an isolated environment to execute applications but also minimizes resources.

3)Has the ability to reduce the size:

Since it provides a smaller footprint of the OS via containers, Docker holds the capability to reduce the size of the development. 

4)Better software delivery:

Software delivery is considered more efficient with the help of containers. Containers are portable, self-contained and consist of an isolated disk volume. This isolated volume evolves alongside the container and is deployed in different environments

5)Rapid Scaling of system:

Containers require less computing hardware and get more work done. They allow data center operators to cram more workloads into less hardware, which means sharing hardware, resulting in lower costs.

6)Security Management:

It saves secrets in Swarm and chooses to grant access to certain secrets to services, including some important commands for the engine like secret inspect, secret create, etc.

Docker Architecture:

Docker

1)DockerHost:

Docker provides a complete environment to execute and run host applications. This includes the Docker daemon, images, containers, network, and storage. As mentioned earlier, the daemon is responsible for all container-related tasks and receives commands via CLI or REST API. It can also communicate with other daemons to manage their services.

2)DockerClient:

The Docker client uses commands and the REST API to communicate with the Docker daemon (server). When a client runs any docker command on the docker client terminal, the client terminal sends these docker commands to the Docker daemon.The Docker daemon receives these commands from the Docker client as commands and requests to the REST API.

3)Docker Registry :

Docker Registry manages and stores the Docker images.

There are two types of registries in Docker –

Pubic Registry – Public Registry is also called as Docker hub.

Private Registry – It is used to share images within the enterprise.

Before Docker, many users faced the problem that a particular code was running in the developer’s system but not in the user’s system. Therefore, the main reason for developing Docker is to help developers easily develop applications, ship them into containers, and deploy them anywhere.

It is used in the deployment phase of the software development life cycle, that is why it can efficiently solve the problems related to application deployment.

Hope you like this blog….
Mahesh Wabale
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