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When you place one end of a metal spoon in hot water, heat flows from the end submerged in water to the end that is not. The temperature at each point in that spoon when viewed collectively is a scalar field. If a temperature-camera were to capture this spoon, it would look like this. Each point in this scalar field defines a temperature value. It does not show direction at all. But when the gradient of this temperature field is taken, the slope reveals that path with the steepest climb or drop in temperature. ...

Disclaimer: this post is AI generated. Promtail is a powerful log agent designed to ship logs from local files to a Loki instance. If you’re setting up a logging pipeline with Grafana Loki, proper Promtail configuration is crucial. This guide walks you through the essential steps to configure Promtail effectively. Understanding the Configuration Process Configuring Promtail involves three key steps: Writing a proper configuration file Ensuring proper file access permissions Restarting the service to apply changes Let’s dive into each step in detail. ...

If you were asked to package HTML (and other static assets) in a Docker container, how would you achieve it? Sure, you can spin up a Node.js or Python application and create a web server that serves the required assets, but that would be a roundabout method of solving a simple problem. Of course, Nginx is a viable option, but which will you choose? $ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest 53a18edff809 7 weeks ago 192MB nginx stable-alpine-slim 95ebc828d689 7 weeks ago 11.8MB ...

A robot needs to know how to: Localize itself Plan its paths Control itself Robots are built to do three kinds of jobs: Dirty Dangerous Dull Robots generally rely on three technologies: Sensors - for perceiving their environment Actuators - for locomotion and movement Algorithms - to guide their decision making Robots may face these three challenges: Efficiently managing energy - energy efficiency Adapting to new environments - environment adaptability Interacting with humans and other living organisms - human interaction Three general types of robots: ...

Training machine learning models is one thing, using them is another. When models are trained for real-time inference, you need a runtime that can deliver results with milliseconds accuracy. If you trained your model on a PyTorch pre-trained model, your inference time will not be optimal if you simply use the torch state dictionary during inference. Converting your Pytorch model into a faster runtime like ONNX is a faster alternative. In this blog post, you will learn how to convert a Pytorch state-dictionary model into ONNX format for faster inference. ...

When running virtual machines in Azure, you sometimes need to add additional IP addresses to your VM’s network interface. While Azure typically manages IP assignments through its network interface configuration, there are situations where you might need to configure IP addresses directly on the VM level. Introduction Azure VMs come with a primary IP address assigned through DHCP. This IP is managed by Azure and configured automatically when your VM boots up. However, there are scenarios where you might need to add secondary IP addresses: ...

Okay so you want a faster and better way to go through your huge user and customer data and thought to use Elasticsearch on your Linux machine. You configured it all right and it works, but you then realize that some things are not quite right and would be happy if you could debug queries, so you thought to install Kibana. Unfortunately, you’ve forgotten the admin credentials you created for elasticsearch and not quite sure how to achieve the whole set up, so you ended up here. Worry not, for this blog post will guide you on the right way to install + configure elasticsearch and kibana on a Linux machine, specifically, Ubuntu (22.04). ...

There are several tools on Linux that just feel heavenly. Like God bless the developers that coded them. Some of these tools like top and htop handle monitoring, while others like ncdu and df tell you about your disk usage. Find below a list of these tools and how you can make use of them. ncdu ncdu falls under the disk usage category. It is an external tool so it doesn’t come with the basic linux binaries. It gives a visual output of the files present in your directories with the ability to go deeper into the tree using your arrow keys. The snippet below shows it indexing a basic node.js setup. Node.js is notorious for having large node_modules directories and this example lives up to that name. ...

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The ESP32 is a versatile chip that comes packaged with the standard GPIOs, a WiFi, and a Bluetooth module. It’s like Arduino but with communication superpowers. It intwgrates right into the Arduino ecosystem, allowing you to use your existing Arduino IDE. This post goes over the set up of this board and how you can run a webhook ping program using it’s on-board Wifi. Purchasing the Board You can purchase the board from a maker store like Adafruit or from Amazon. There are typically two forms of the board available in the market: ...