Today, I am going to discuss What is a Container? and in the coming blogs, we will discuss Docker.
A container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. A Docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.
Containers are an abstraction at the app layer that packages code and dependencies together. Multiple containers can run on the same machine and share the OS kernel with other containers, each running as isolated processes in userspace.
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Why we use the container?
Instead of virtualizing the hardware stack as with the virtual machine’s approach, container virtualizes the operating system level, with multiple containers running on the top of OS Kernal directly. This means containers are far more lightweight than VMs. It takes up less space than VMs (container images are typically tens of MBs in size), can handle more applications and require fewer VMs and Operating systems. Virtual Machines, on the other hand, are heavy in weight.
Quick Migration between environments.
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Containers give developers the ability to create predictable environments that are isolated from other applications. The container can also include software dependencies needed by the application, such as the specific version of programming languages runtime and other software libraries. Containers and virtual machines have similar resources isolation and allocation benefits but functionality differently because containers virtualize the OS instead of hardware. Containers are more portable and efficient. In the next topic, we are going to discuss docker.
Next tip for the topic remembers 3 things in Docker.
Builder Tech image uses to build container.
Engine Divide big application into small.
Orchestration Tech used to manage many containers.
If you like this blog, What is a Container?