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Docker Containers Running Slowly? Try These Tricks!

Have you been facing limitations with Docker containers because they are not delivering the expected performance? That happens in several instances. As much as the Docker App Containerization Tool can help you leverage business benefits in the form of easier transfer of applications as artefacts by converting them into packaged software, eliminating the “this works only on my device” issue, and thereby speeding up the processes by making them more convenient and flexible; everything can backfire if you are not using the tool right.

Just some technical ignorance on your part in deploying the Docker containers, and they will run very slowly. So, you cannot be sure that Docker App Containerization Tool is a guaranteed solution for all business development and operational requirements. However, some intelligible planning and precautionary measures during deployment can be a game-changer.

How to Speed Up Docker Containers for Better Performance?

Speeding up the Docker containers must always be a priority if you want better, faster, and scalable business operations. Moreover, you can easily achieve the speed and performance you expect. It’s just some small processes and practices, and they will do all the trick. So, why not try that?

However, before you can move on to trying the trick, it’s important that you get a better understanding of the Docker containers.

What Do You Need to Know About Containers?

One big mishap that happens when planning the deployment of Docker containers is having the wrong idea about what they actually are. You may think that containers are virtual machines. But that’s just a big misunderstanding.

You need to know that Containers are NOT Virtual Machines!

Virtual Machine is software build on your systems that represents a complete hardware system. You can call it hardware built upon software. They don’t have to depend on any host machine. They are independent units.

However, containers are an independent environment for different applications running on the same system. They depend on the host machine on which they are created. So, if a container is running on a Windows host, it will only be compatible with Windows.

Moreover, a virtual machine will need a complete operating system. However, in container environments, applications run with select OS components and thus you can run multiple workloads over a single operating system.

That’s where the real-world implication of the difference between virtual machines and containers lies. Now, the question here is, why do you need to know this difference?

Simple answer… So that you may successfully and efficiently meet your business requirements for the implementation of containers. You need to know what applications you want to run within the containers and then decide the host machines accordingly so that the applications are compatible with the containers.

The host dependency is also associated with the containers’ speed and performance. So, that’s where you need to do all the tricks. Let’s straight move to the tricks!

3 Ways You Can Enhance the Speed of Docker Containers

Chain the RUN Commands in a Single Statement

When you execute a RUN command on Docker Containers, different Docker Images and Layers are realized. For achieving speed in the runtime of containers, you need to keep these layers as less as possible.

Now, this requires an understanding of what these layers are, how they are created, and how they are stored.

A Docker Layer is basically a part of the Docker image that’s stored on the host file system in a container. The Host File is the place where all the RUN commands are stored and executed for building Docker images and layers to execute the required operation in the container.

The file has seven RUN commands, and the more the commands you use for creating the image, the slower the load time will become since the image size increases with each command. You know that a larger image will take longer to load.

That’s what you need to avoid, and a great trick is chaining all the RUN commands together. At this stage, you have to explore the && operator when writing the RUN commands.

The && operator will chain all the RUN commands together and convert them into a single command statement. That’s going to reduce the number and size of the Docker layers and do the trick for you to speed up and enhance Docker containers’ performance through faster image load time.

Leverage the Power of Multistage Build

A multistage build is another fantastic trick you can use to speed up the Docker containers. This will work on the same principles as chaining the RUN commands. With a multistage build, you can significantly reduce the size of a container image.

You have to use the FROM command here. The FROM statements will define the base layer of a Docker image and then create a unique name for every instruction in the FROM statement. So, you can simply use the created name for the subsequent stages in the Docker BUILD.

The benefit comes in the form that the named stages are discarded once they are used. So, the number of layers in the build is reduced, which reduces the image size, and thus the image load time.

With the reduced load time of the images, you can easily speed up the performance of Docker containers.

Preload Image Cache

Docker executes every RUN command through the Docker images. Now, when you want to execute a command, Docker will look through the entire files and databases to find the relevant images for executing the command. If it finds the image in the file, the execution will be really fast. However, if the image files are not available, Docker will access the internet, find the files and layers in the Docker Hub, download them, read them, and then execute your command.

That is going to take a significant amount of time, depending on the image size and the number of layers. An easy way to eliminate this hassle is to preload your Docker files’ images before you execute the commands.

Once the images are preloaded, they are already there for the containers to execute the commands, and you are able to reduce the load time and run time significantly.

Of course, preloading the images will be time-consuming. It will require a lot of planning on your part, but that’s a one time hassle that will save you from any delays and hassles in the future.

Ready to Speed Up the Containers?

Having a read of the abovementioned tricks, you can easily make out that the key is to keep the size of the image and the number of layers as low as you can.

The entire catch is in reducing the image load time, and once you are able to achieve that, you’re not going to face any speed issues with the Docker containers.

Hope these tricks help you out at best. If you are looking for more scalable Docker Solutions and Services, please feel free to contact us at any time, and we can help you immensely in leveraging the Docker Container Tool for its best capabilities!

Mitisha Agrawal


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Mitisha Agrawal

Mitisha Agrawal

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