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CSS Input Type Submit Example

1. Introduction When designing a website, one of the key points to consider is how the user is going to interact with it. A good website UI makes it easy for the end user to navigate your website and send information back to you, while maintaining a beautiful visual experience at the same time. CSS plays an important role in ...

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Using Docker Commit to Create and Change an Image

The Dockerfile is one of the key features to Docker’s success. The ability to build a new container image from a simple text file changed the technology game. When it comes to modifying a Docker image, our first thought is modifying the underlying Dockerfile. In today’s article, I’m going to show you another way to create and change a Docker ...

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HTML5 Accordion Example

In this article we will build an Accordion using HTML5 and a dash of JavaScript. The Accordion widget is quite useful when we want to present just a teaser at first and if this interests the user, we provide detailed information. Basically we have content which collapses or starts out as such allowing the user to expand and get into ...

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Improving Ruby Performance with Rust

A couple of years ago, I found a few methods in my Rails application that were called several thousand times and accounted for more than 30 percent of my website’s page load time. Each of these methods were strictly focused on file pathnames. Along with that, I came across a blog post that said “Rust to the Rescue of Ruby,” ...

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Docker (Swarm) and NFS volumes

Investigating how to use shared volumes with Docker (Swarm), I decided to take a look at NFS volumes, since this is probably the most used on premises way to share folders. With Docker, you have 3 different syntaxes to mount NFS volumes : simple container (via docker volume create + docker run) single service (via docker service create) complete stack ...

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Why Metrics Must Guide Your DevOps Initiative

Discover faster, more efficient performance monitoring with an enterprise APM product learning from your apps. Take the AppDynamics APM Guided Tour! Read more to learn why a metrics-oriented framework is a critical piece of a DevOps philosophy. Metrics-oriented thinking is key to continuous improvement – and a core tenant of any agile or DevOps philosophy. Metrics are factual and once ...

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Python 3: TypeError: unsupported format string passed to numpy.ndarray.__format__

This post explains how to work around a change in how Python string formatting works for numpy arrays between Python 2 and Python 3. I’ve been going through Kevin Markham‘s scikit-learn Jupyter notebooks and ran into a problem on the Cross Validation one, which was throwing this error when attempting to print the KFold example: Iteration Training set observations Testing ...

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Essential (and free) security tools for Docker

Docker makes it easy for developers to package up and push out application changes, and spin up run-time environments on their own. Maybe too easy. With Docker, developers can make their own decisions on how to configure and package applications. But this also means that they can make simple but dangerous mistakes that will leave the system unsafe without anyone ...

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HTML5 Webcam Tutorial

1. Introduction In this article, we will look at how to capture images as well as video from user’s webcam. There have been several iterations to enable access to devices from JavaScript. Starting from special attributes for existing input tags to getUserMedia part of the WebRTC APIs. We will look at how to use these and leverage them for accessing ...

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