By changing the Dockerfile to the following one, the final size of our image is 22.4 MB. If we run the container, we can

Lazy evaluation is a programming technique that allows our program to delay the expensive operations (e.g. a web request, a computationally heavy calculation) as much as possible.

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e of the most popular machine learning library in Python. NumPy is generally used for scientific computation. TensorFlow and other libraries use NumPy within for performing multiple operations on Tensors. Array interface is the best and the most prominent feature of NumPy.

Let’s start with an example in which we build a React application and we want to dockerize it. After running the npx command and creating the Dockerfile, we have a file structure like the one in Picture 1.

Still, other new users seem perplexed by Parler’s onboarding process, which entails a CAPTCHA test — a standard bot detection tool that many users apparently found suspicious. Others find the site’s design to be confounding since it looks and functions so differently than Facebook. Parler lacks groups and pages, for instance, and its search functionality is limited to usernames and hashtags. Some Facebook group members seemingly confused the act of joining the Facebook group for signing up to Parler.

By changing the Dockerfile to the following one, the final size of our image is 91.5 MB. Keep in mind that the image from the previous stage (lines 1–4) is not automatically deleted, Docker keeps it in cache to run faster if we use the same stage in another build, so it has to be deleted manually .

Lazy evaluation is a programming technique that allows our program to delay the expensive operations (e.g. a web request, a computationally heavy calculation) as much as possible.

Now we have a Dockerfile with two stages: in the first one we compile the project and in the second one we deploy the application on the web server. However, a Node container is not the best option to serve web pages (HTML, CSS and JavaScript files, images, etc.), the best option would be to use a server like Nginx or Apache. In this case I will use Nginx.

“I’ll not be sending my ID to them,” another member replied. “I joined a few weeks ago and it’s not user friendly at all. I’m tired of Facebook and can’t believe Parler can’t do better.”

“You have to be a verified user before you can send a direct message to a friend,” one Facebook group member wrote. “Getting verified requires you [to] send them a copy of your ID. Not comfortable with them having my ID and thinking about deleting account.”

Normally, images based on Alpine or BusyBox are extremely small in size compared to those based on other Linux distributions, such as Ubuntu. This is because Alpine and those other images have been optimized to include the minimum and must-have packages. In the following image you can see a comparison between the sizes of Ubuntu, Alpine, Node and Node based on the alpine.

In this example, what we need to deploy the React application is the compiled code; we don’t need the source files, nor the node_modules directory, nor the package.json, etc.

With multi-stage build, we can use multiple base images in the Dockerfile and copy artifacts, configuration files, etc. from one stage to another, so that we can discard what we don’t need.

Docker is a platform for software developers and sysadmins to build, run, and share applications with containers. A container is a process that runs in an isolated environment, on its own filesystem; that filesystem is built using a docker image. Images include everything you need to run an application (compiled code, dependencies, libraries, etc.). Images are defined using a file called Dockerfile.

“I want a Parler account but I am done signing up with apps that require my cell phone number,” a user wrote in one of these Facebook groups, referring to Parler’s two-step verification process. (On Twitter, Parler has addressed similar concerns, tweeting, “The phone number is for your protection.”)

In an effort to assuage this person’s privacy fears, one user vouched for the platform’s credibility by mentioning Bongino, the popular conservative commentator who acquired an ownership stake in Parler this year. Bongino is mentioned in many of these groups’ discussions, and seems to be one of the company’s main evangelists. “Dan Bongino is owner of Parler. I certainly find him honorable unlike Zuckerberg and Dorsey,” that user replied.