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PostgreSQL is an object-relational database management system, which I often to use for many products. Some of this products should have high availability and working without any downtime. This means, I should run a database schema migrations while the app is up and serving requests. I have to be very careful about what database operations I run. If I run a bad command, it can lock out updates to
Hello my dear friends. Today we will continue to talk about Chef. But today my article will be about Chef cookbooks by TDD. If you don't know what is Chef and how to use it, then you should better start with my articles about it. All code examples you can find here: github.com/le0pard/chef-tdd-monit. Chef testing tools First, let's look what tools exist to test Chef cookbooks today. Foodcritic Sit
Hello my dear friends. Today we will speed up our rails application using webp images. What is WebP? WebP is an image format that employs both lossy and lossless compression. It was developed by Google. As we can see on this page, today only Google Chrome (+ Android) and Opera support this type of images. But it is not a problem. We can show webp images in these browsers, but in another browsers w
Hello my dear friends. Today we will talk about Chef and usage Chef Solo like a Pro. All example code you can find here: github.com/le0pard/chef-solo-example/tree/1.0 What is Chef? Chef is an open-source systems integration framework built specifically for automating the cloud. Why you should use Chef? Efficiency: It’s more effective to use Chef, which will contain all your servers configuration i
Hello my dear friends. Today we will continue talk about Chef Solo. All example code you can find here: github.com/le0pard/chef-solo-example/tree/2.0. In the previous article we discussed how to use Chef Solo, learned about knife, librarian and vagrant tools, which help us to use and testing Chef Solo kitchen. In this article we will learn cookbook structure and will write own cookbook. Cookbook C
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