If we ask what is Docker there could be many answers to, because Docker is a company and it has products with name Docker itself. Here in this article if we Docker it would be related to the Docker container tool or program.
It’s often seen that the project that we have created on our local system and environment works fine, but when it deploys or run on other systems it shows some issues, because the other system may not contain some dependencies or tools that your system had, to resolve such problems we use containers program.
What are Containers?
Containers are special programs that can isolate processes in it. They can assign resources to the project and hold all the dependencies at once. With the help of container, we can pack our complete project include all dependencies such as libraries APIs, etc in one package.
Advantages of Containers:
- With containers, we can isolated processes.
- With two containers in the same system can run side by side without interfacing each other processes.
- We can manually configure the process of one container to communicate with other containers process explicitly.
- Different containers in the same system will shear the same hardware, but processing of each will be individual.
What is Docker?
Docker is a company which has a product called Docker container. Docker is a software development platform similar to a virtual machine which is basically used to create, deploy and run applications in a containerized environment. As we know that containers help the developer to create an environment which holds the project itself along with its all dependencies so it could be deployed on any platform and work same as it was working on the developer local system.
Containers give assurance to the developer, that the project was created work same as it was in developer system and there is no need to make any other changes in that project to make it run on other systems.
Up to some extent, we can compare a Docker with Virtual machine which makes the code platform-independent.
The most important thing, Docker is an open-source software which means anyone is free to use docker to create their own project, but there are many premium other premium Docker features which are paid.
Where to use Docker
Docker is mostly used as one of the DevOps tools, in DevOps (Developers, Operations) culture we often require containers so developers can work on isolated projects and no conflict arise when they share the same system.
With the help of Docker, developers can write their individual codes, without concerning about system collapsing two processes.
Some Main Features of Docker:
Docker is one of the popular virtualization technologies for software delivery and deployment. Here are some main features of Docker.
1. Easy to Use
Docker provides a virtualization interface, that makes Docker not to completely dependent on command lines. With its virtualization interface, docker is very easy to use if we compare it with other virtualization tools such as vagrant, Kubernetes etc.
2. Open Source technology
It is an open-source tool so anyone can use it for their own project and would not need any license or confirmation from Docker developers.
3. Scaling Applications
With docker, we can work with different containers which directly run on Docker host with Linux native programs. Before docker, most of the maintenance cost went to hardware to scaling up the application, with the Docker there is less workload on the hardware and makes different containers to run on shared memory saved the maintenance cost and increase the scalability of the applications.
4. Application Delivery
With Docker containers, delivery of application has become more convenient. As containers are portable and make the application platform-independent. Container contains project as well as all its dependencies so it could be work any platform.
A docker can contain many containers at once and give control to the user how he wants to manipulate all the containers, user can manipulate containers accordingly which provide more flexibility to use a docker container.
Docker uses the microservices architecture in which the application is divided into many micro sub-processes. The main advantage of microservices architecture, even a process get failed it would not create any effect on other processes of containers.