Linux Café

Introduction to Systemd Boot Times

I’ve seen my fair share of slow-booting Linux systems over the years, and it’s frustrating when you’re waiting for your system to start up. With modern hardware and Linux distributions, boot times should be relatively fast, but misconfigured services, unnecessary dependencies, and inefficient system initialization can still cause issues. That’s where systemd-analyze comes in - it’s an invaluable tool for identifying bottlenecks and optimizing your system’s performance.

Introduction to Disk Full Alerts

I’ve lost count of how many times I’ve received disk full alerts on my home server. It’s frustrating, especially when it happens at the worst possible moment. Last year, I had a particularly annoying issue that prompted me to take a closer look at my disk usage. I realized I needed to make some changes to prevent these issues in the future. In this article, I’ll walk you through the steps I took to resolve disk full alerts on my server by implementing quotas and cleaning up systemd journal logs.

Introduction to btrfs Snapshots

I’ve been running Linux for years, and one thing I’ve learned is the importance of managing disk space effectively. btrfs has been a game-changer for me - its snapshotting and automatic pruning features have saved me from more than a few headaches. In this article, I’ll share my experience with using btrfs snapshots to keep my systems running smoothly.

What are btrfs Snapshots?

btrfs snapshots are essentially temporary copies of a subvolume, which can be used to roll back changes or recover data if something goes wrong. I’ve seen this go wrong when I’ve accidentally overwritten important files or filled up my disk with unnecessary data. With btrfs snapshots, you can create a snapshot of your system, make changes, and then delete the snapshot if everything works out. The real trick is to use them consistently and make them a part of your workflow.

Introduction to Disk Space Reclamation

Running a small Linux server at home can be a fun hobby, but it’s easy to let disk space get out of control. I’ve seen this happen to me when I forget to clean up old package versions, logs, or just general clutter. In this article, I’ll walk you through the process of reclaiming disk space from unused package versions on your Linux server. Don’t bother with trying to manually track down every last byte - the real trick is to use the right tools to make the process as painless as possible.

Introduction to journalctl

I’ve been using Linux for years, and journalctl has become an essential tool in my daily workflow. If you’re like me, you’re probably familiar with the journalctl command, which is used to query and display logs from systemd’s journal. However, with the vast amount of data that’s logged, it can be overwhelming to sift through and find the information you need. In this article, I’ll share some practical tips and tricks for filtering out noise and finding useful error messages in your system logs using journalctl.

Introduction to Resource Management

I’ve seen this go wrong when you’ve got a bunch of background tasks running on your Linux machine, whether it’s a homelab, self-hosting services, or just your everyday desktop. If you don’t manage these tasks, they can consume way too many resources. That’s where nice and ionice come in - they’re essential tools for taming those resource-hungry background tasks.

Understanding nice and ionice

The real trick is understanding how nice and ionice work. nice adjusts the scheduling priority of a process, which is useful when you want to control how much CPU time a process gets. By default, Linux uses a dynamic priority scheduling algorithm, but nice lets you override this and set a manual priority. The nice value ranges from -20 (highest priority) to 19 (lowest priority).

Introduction to Log Rotation

I’ve seen log rotation become a major issue on small servers with high IO workloads - it’s a problem that can sneak up on you quickly. Logs can grow at an alarming rate, and if you don’t manage them properly, they can fill up your disk space in no time. The real trick is to stay on top of log rotation, and that’s where tools like logrotate come in.

Introduction to Log Noise

I’ve spent countless hours digging through log files to troubleshoot issues or monitor system performance. But let’s be real, log noise can quickly become overwhelming. I’ve seen this go wrong when you’re dealing with massive log files and no clear way to extract valuable insights. Recently, I’ve been working with increasingly complex JSON and YAML logs, which led me to explore tools like jq and yq to tame the noise. Don’t bother with trying to parse these logs manually - it’s a recipe for disaster.

Introduction to Borg Backup

I’ve been on the hunt for a reliable backup solution that can handle my laptop’s limited disk space for ages. When I stumbled upon Borg Backup in 2025, I thought I’d finally found the answer. This deduplicating backup program has been a game-changer, but I soon realized that its default settings weren’t exactly optimized for my laptop’s storage constraints. So, I set out to tame the beast and get Borg Backup to respect my laptop’s limited disk space.

Introduction to cgroups

I’ve found that managing resources on Linux systems can be a real challenge, especially when dealing with resource-intensive desktop apps. That’s where cgroups come in - a powerful tool that allows you to allocate and manage system resources such as CPU, memory, and I/O for a group of processes. In my experience, cgroups can be a game-changer for keeping your system running smoothly.

Creating a cgroup

To get started with cgroups, you’ll need to create a new group using the cgcreate command. This command not only creates the group but also specifies the subsystems that will be controlled. For example, to create a cgroup that controls CPU and memory usage, you can use the following command: