Cron jobs are a nice way to automatically run scheduled tasks. The cron service in Linux systems is the typical approach when scheduling commands on the operating system. {{outline}} Testing a Cron Job Recently the certbot from Let’s Encrypt didn’t automatically renew SSL certificates anymore. We used a …

We recently provisioned a new Debian VM and noticed that the sudo command wasn’t available. Our typical workflow includes the sudo command at the beginning of commands. The good news: you can install the sudo command on Debian and give your user the “sudo” permissions. {{outline}} Install the “sudo” …

Running an Ubuntu or Debian operating system on your servers comes with a long lifetime. You won’t switch servers and migrate your applications that often. You’ll maintain your system now and then and update installed packages to keep your system secure. Recently, while maintaining the software on our …

Installing packages with the apt-get package manager on Ubuntu or Debian usually fetches the latest known version from the repositories. This is a comfortable behavior to use an up-to-date version of the package. If you want to install a specific package version, you can do that by appending an equal …

CoreOS is suited for all kinds of use cases. In the previous blog posts we’ve shown you how to submit and run a Node.js application inside a Docker container on a CoreOS cluster and also how to scale this Node.js app to multiple instances across the cluster. …

This post is a follow up on our tutorial guiding you through the setup on how to submit and run a Node.js app on a CoreOS cluster. Within the previous post, we only showed you how to submit and run a single app instance on a given machine within …

During the last weeks, we’ve learned the fundamentals of three important components of the CoreOS ecosystem. Additionally, you’re able to manage key-value-pairs within etcd and services within our cluster using fleet featuring systemd. This gives us all the required knowledge to finally make the step from just running …

If you’ve read the previous articles within this CoreOS series, you’re already familiar with an essential component within the ecosystem: etcd. This post will introduce two other fundamental components of the CoreOS: fleet and systemd {{outline}} systemd systemd is an init system providing functionality to manage processes on …