Know Docker And How It Works
Is it Docker?
Docker is an open platform for upgrading, shipping, and running programs. Docker allows us to separate the program from the infrastructure to be able to send programs quickly. With Docker, we can take care of infrastructure the same way we take care of programs (infrastructure with code). By leveraging the Docker methodology for fast transport, testing, and implementation of code, we can substantially reduce the delay between writing code and running it in production.
Docker is considered one of the Containers. A container is a standard unit of software that packages code and all its dependencies so that programs run quickly and reliably from one computing environment to another.
Containers versus Virtual Machines
Containers and virtual machines have a similarity in closing resources. The difference is that the container virtualizes the operating mechanism while the virtual machine virtualizes the hardware.
A container is an abstraction in a program structure that packages code and dependencies together. Multiple containers can run on the same machine and use the same OS kernel as the host OS. Containers take up less space than virtual machines.
While a virtual machine is an abstraction of hardware that allows one physical server to become many virtual servers. The hypervisor allows multiple virtual machines to run on a single machine. Each virtual machine includes a complete copy of the operating mechanism, programs, binaries, and required libraries, taking up several tens of GB of space. Virtual machines can also be slow to boot.
Docker provides the power to package and run programs in an isolated environment called a container. Its isolation and security allow us to run containers simultaneously. A lightweight container that contains everything needed to run a program, so it doesn't depend on libraries that reside on the host OS.
Docker provides the tools and the base for managing container life transitions.
Improve programs and their components using containers.
Containers become units for sharing and testing programs.
Deploy the program to the production environment as a container. Containers play the same role, whether it's on-premises, production environments, or in the cloud.
When to Use Docker?
Docker streamlines the upgrade life transition by enabling us to work in a standard environment using local containers that provide programs and services. Containers are really good for continuous integration and continuous delivery (CI/CD) work lines.
Example of a Docker usage scenario:
- Developers improve programs locally and share their work using Docker.
- Developers use Docker to send it to the test environment and run both tests automatically.
- When a developer finds a bug, the developer can make improvements in the upgrade environment and send it back to the test environment for testing and validation.
- When the test is complete, it sends the Docker image to the production environment.