![]() ![]() Docker gave these early users a new, faster way to build distributed apps as well as a “write once, run anywhere” choice of deployment from laptops to bare metal to VMs to private and public clouds. In its first 12 months Docker usage rapidly spread among startups and early adopters who valued the platform’s ability to separate the concerns of application development management from those of infrastructure provisioning, configuration, and operations. Here is an excerpt from the Docker blog that explains the reasons for this success: Its lightweight containers are extremely fast compared to classic VMs and have become extremely popular among developers. Developers need to code/build/test every few minutes and won’t accept the virtualization overhead. Virtual environments ensure these features. Repeatable: the same environment should be consistently reproducible on every team member machine and on CI and production servers. Isolated: you don’t want to mess it up when testing some new tool or a different project. Virtual environments and DockerĪs a consequence development environment should have two characteristics: Diverging can be as simple as giving a try to the last version of a framework or switching to a different project for half a day.įinding out what makes your system behave differently is an annoying task every developer should avoid. Have you ever skipped your build’s automated tests because they failed on your machine? Or even worst, have you ever been the cause of a build break even if your changes compiled smoothly on your machine but failed consistently on CI server?Īny slight difference can result in an unexpected behaviour. It can differ too much from testing and production environments.Two steps should be sufficient to setup your environment and get ready for development. Hey! It should be much faster than that: checkout a script and execute it. How long does it takes for a new developer to setup your current project’s development environment? The answer may depends on many factors (the project age, the number of developers that have worked on it, etc…) but half a day or more is not an uncommon one. What’s wrong with development environments? But if you want to just start using Docker with Vagrant jump to the corresponding section. The first part of this blog post deals with the common flaws of development environments, the setup of a simple Docker environment and the benefits of a Vagrant+Docker configuration. ![]() We will prove it setting up a Docker container for development of a Java application and taking advantage of Vagrant powerful features to solve some real life practical issues. Often considered two alternative tools, Docker and Vagrant can be used together to build isolated and repeatable development environments. ![]()
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