Collect JSON metrics with Telegraf

Telegraf is a powerful, plugin based metrics collector that also provides Prometheus compatible outputs. For various purposes, there are a number of input plugins that can collect metrics from various sources. Even more powerful are the processor plugins that allow metrics to be processed and manipulated as they pass through, and immediately output results based on the values they process. In this short blog post I’ll explain how to fetch JSON metrics from the Docker registry API to track some data of a DockerHub Repository.

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SSL certificate monitoring pitfalls

Certificates are a fundamental part of the Internet’s security. At least since Let’s Encrypt, a free and automated Certificate Authority, has started its service, SSL is nearly used everywhere. To avoid Certificate issues and possible service outages, it’s a good idea to monitor the SSL certificates used by your services, especially as Let’s Encrypt certificates have a short lease time of 90 days. I’m using Prometheus to monitor my infrastructure, and for Prometheus there are multiple ways to get started.
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Toolbox 2: git-plus

If you work with a lot of Git repositories on a regular basis, you’re bound to run into the situation where you need to make changes to multiple repositories sooner or later. While it would be possible to run your Git commands in a shell loop over everything repositories, it is often tedious to type the command or remember the correct syntax.

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Toolbox 1: direnv

We all use many different tools every day e.g. for our work, automation or better productivity. In the series “Toolbox” I would like to present such applications that have made my day-to-day work so much easier. All applications are free and open source software developed by big tech companies as well as lovingly handcrafted hobby projects. If you also know an awesome tool that has changed your life, I would love to hear from you on Mastodon.
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Run an ARM32 Docker daemon on ARM64 servers

In the last days I worked on a suitable setup for a Drone CI server to support multi-arch builds. While the setup for common x86 Drone runners is easy, working with setups for ARM, especially ARM32, is a bit tricky. The easiest way would be to have native servers of the respective architecture available. However, it’s difficult to find hosting offers for ARM at all - for ARM32 this seems almost impossible. I decided to use Amazon EC2 ARM64 servers, they are relatively cheap and can also be used as a private customer.

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