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Love them or hate them, containers have become part of the infrastructure running just about everything. From Kubernetes to Docker, almost everyone has their version of containers. The most commonly used is still Docker.

IronWorker was among the very first to combine serverless management with containers. In this article we will give a high-level overview of what a Docker image is, and how IronWorker uses them.

Table of Contents

Related Article: How to create a Docker container

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To start, we need to have an understanding of the Docker nomenclature and environment. There is still not a clear consensus on terms in regards to containers. What Docker calls one thing, Google calls another, and so on. We will only focus on Docker here. (for more on Docker vs Kubernetes, read here).

Docker has three main components that we should know about in relation to IronWorker:

1. Docker file
2. Docker image
3. Docker container

1) Docker File

Let’s keep it simple. Docker files are configuration files that “tell” Docker images what to install, update, etc. Basically the Docker file says what to build that will be the Docker image. These files have everything to eventually build a container. The types of files include dependencies, application code, installations, and everything else that is needed to execute effectively.

2) Docker Image

A Docker image is the set of processes outlined in the Docker file. It is helpful to think of these as templates created by the Docker files. These are arranged in layers automatically. Each layer is dependent on the layer below it. Each layer then becomes more abstracted than the layer below.

By abstracting the actual “instructions” (remember the Docker files?), an environment that can function with its resources isolated is created. While virtual machines relied on calling OS level resources, containers have eliminated this. In turn, this creates a lightweight and highly scalable system. IronWorker takes these images and begins the process of creating and orchestrating complete containers.

You can create a docker image by using an existing image and updating its file components for the present container. You can also create the docker image from scratch through the use of a Dockerfile you construct.

What exactly is the difference between a Docker image and a Docker container? Let’s see.

3) Docker Containers

Finally we come to the containers. To simplify, we can say that when a Docker image is instantiated it becomes a container. By creating an instance that draws on system resources like memory, the container begins to carry out whatever processes are together within the container.

In other words, a Docker image runs the code in the Docker container. Everything that’s needed to perform a complete task is in the image, but it becomes functional once it is executed within a container. The image may be used once or multiple times.

While separate image layers may have different purposes, Docker containers are formed to carry out single, specific tasks. That is one reason why typically a Docker image has several layers of files that perform different jobs. They work together to achieve the primary objective of the Docker container.

To make this distinction even more clear, we can use an example from nature. Think of a bee vs. a beehive. In the community of the hive, individual workers-- bees -- carry out asynchronous tasks to achieve a single goal. In short, containers are packages which hold all of the required dependencies to run an application.

After the container has been run, the Docker image is inert and inactive. This is because Docker image has carried out its purpose and now serves only as a meta reference.

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IronWorker and Docker

So, you have your containers configured and everything is ready to go. What next? Docker containers can function on their own. However, things like scaling workloads is much faster, more reliable, and easier with an orchestrator. Dicom viewer for mac. This improves the efficiency of Docker deployment as well as giving organizations room to grow their processes.

IronWorker is one such container orchestrator, with some unique properties. IronWorker is a hosted solution that offers a number of flexible options to optimize your background job processing -- take a look at the potential on the IronWorker website.

An orchestrator adds another layer of abstraction to implementing and running containers. This has become known as “serverless” in recent years. While there is no such thing as a truly serverless, the term simply means there is no server management involved. By this point in the configuration, we have likely all but forgot about our original Docker image.

Download iterm for mac. Why does it benefit you to partner with an outside team to handle serverless applications? It reduces the time burden on developers and allows organizations to make better use of their own skilled professionals.

Forgetting about managing a server to react to spikes in traffic or other processing needs greatly simplifies a developer’s job. Tasks and other processes are scaled automatically. At the same time this allows for detailed analytics. Because the containers are managed by IronWorker, whether they are short lived or take days, the jobs are completed with minimal developer input after the initial setup.

What about migrating to other clouds or on-premise?

Traditionally, containers have been cloud based. As new options develop beyond just Amazon Web Services, the need to deploy flexible tools increases. Obviously devops changes frequently. Sometimes it even changes daily.

One of the key benefits to IronWorker is that exporting your settings (as Docker images) and continuing on, either redundantly or in new iterations, in varying environments is the easiest in the marketplace. This includes deploying fully on-premise. This ability to maintain freedom from vendor lock-in and future needs is what separates IronWorker from the rest.

Continue Learning About Docker Containers

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