Container Images Docker Creator

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Container Images Docker Creator is tool or software used to create, manage, and publish Docker container images, simplifying the packaging of applications and dependencies for modern software development and deployment.

A Docker image is a read-only template that contains a set of instructions for creating a container that can run on the Docker platform. It provides a convenient way to package up applications and preconfigured server environments, which you can use for your own private use or share publicly with other Docker users. Docker images are also the starting point for anyone using Docker for the first time.
So, in this introduction, we'll not only take you through the basics of Docker images, but also show you where to find ready-made, off-the-shelf images that will give you a head start in building your own containerized applications, tools, and services.
As a new Docker user, you'll also need to understand how to build your own custom images. So, we'll briefly cover how to create Docker images for deploying your code and assembling container-based services. But first let's look at the composition of a Docker image in more detail.

Anatomy of a Docker Image
A Docker image is made up of a collection of files that bundle together all the essentials – such as installations, application code, and dependencies – required to configure a fully operational container environment.

You can create a Docker image by using one of two methods:
Interactive:
By running a container from an existing Docker image, manually changing that container environment through a series of live steps, and saving the resulting state as a new image.
Dockerfile:
By constructing a plain-text file, known as a Dockerfile, which provides the specifications for creating a Docker image.

For now, though, let's focus on the most important Docker image concepts.

• Image Layers
  Each of the files that make up a Docker image is known as a layer. These layers form a series of intermediate images, built one on top of the other in stages, where each layer is dependent on the layer immediately below it. The hierarchy of your layers is key to efficient lifecycle management of your Docker images. Thus, you should organize layers that change most often as high up the stack as possible. This is because, when you make changes to a layer in your image, Docker not only rebuilds that particular layer, but all layers built from it. Therefore, a change to a layer at the top of a stack involves the least amount of computational work to rebuild the entire image.
• Container Layer
  Each time Docker launches a container from an image, it adds a thin writable layer, known as the container layer, which stores all changes to the container throughout its runtime. As this layer is the only difference between a live operational container and the source Docker image itself, any number of like-for-like containers can potentially share access to the same underlying image while maintaining their own individual state.
• Parent Image
  In most cases, the first layer of a Docker image is known as the parent image. It's the foundation upon which all other layers are built and provides the basic building blocks for your container environments. You can find a wide variety of ready-made images for use as your parent image on the public container registry Docker Hub. You can also find them on a small number of third-party services, such as the Google Container Registry. Alternatively, you can use one of your own existing images as the basis for creating new ones.
  A typical parent image may be a stripped-down Linux distribution or come with a preinstalled service, such as a database management system (DBMS) or a content management system (CMS).
• Base Image
  In simple terms, a base image is an empty first layer, which allows you to build your Docker images from scratch. Base images give you full control over the contents of images, but are generally intended for more advanced Docker users.
• Docker Manifest
  Together with a set of individual layer files, a Docker image also includes an additional file known as a manifest. This is essentially a description of the image in JSON format and comprises information such as image tags, a digital signature, and details on how to configure the container for different types of host platforms.