#docker

As a web software developer, you will often face problems like setting up various servers, be it web servers like Apache, nginx or Litespeed, or the working environment for a scripting language like PHP and Node.js. This setup brings a lot of compatibility and security issues with it. In the recent years, Docker has established itself as the “to-go” solution, when setting up a local or remote working environment. While on the local developer’s machine, it’s as easy as doing brew install docker or apt install docker, when it comes to creating a real live production server, it’s not that simple. Usually production servers should not be running any software as a root (administrator) user, to avoid security issues, and this is how Docker is started by default - with full system privileges. As you can imagine, having an insecure application in an enterprise environment is not desirable. Now there is a setup for Docker called “rootless mode”, that allows running the software with another user, that has restricted privileges. I will be showing how to install Docker + Docker Compose using terminal commands and automate the process, using Ansible - a server configuration tool.

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Today i’d like to show you how to make Logstash Docker container output its operation to a log file inside the container. I’m writing specifically about this, because the official Logstash documentation is a bit vague and unless you know how Java (the language ELK stack is written in) logging with the third party library log4j2 works, you might struggle with this issue like me.

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