Troubleshooting
Firejail command
Firejail is a tool to sandbox applications to restrict what they can do. It is a useful tool to limit the risk on privilege escalation and exploits.
How to see all DNS requests on the system?
Looking for all DNS requests made on a Linux system? Tools like dnstop, firejail, and tcpdump can help to find what is being queried.
Captest command
The Linux command captest helps with testing capabilities and in particular to see if privilege escalation is possible.
Troubleshooting software issues
This is the troubleshooting area for Linux software with focus on software issues, troubleshooting and resolving them.
How to verify a systemd unit for errors?
Learn how to troubleshoot issues with systemd units by verifying the unit files for any errors. One of the tools to help is systemd-analyze.
Troubleshooting a failed systemd unit (with examples)
Systemd units may be shown in a failed state if something goes wrong. Learn how to troubleshoot these failed units, possible causes, and how to resolve them.
Nstat
The command nstat provides network interface statistics on Linux and can be used for monitoring and troubleshooting. Learn about the available nstat options.
Troubleshooting a full /boot partition on Ubuntu
Is your /boot partition full and apt can no longer install updates? Learn how to fix this issue and what you can do to prevent it.
Understanding what runs on your Linux system (and why)
Linux systems have a lot of processes running by default. Let's dive into how programs are started and how you can see all details of each running process.
Understand and configure core dumps on Linux
When a Linux program or process gets into trouble, it typically crashes and leaves a core dump. Learn what Linux core dumps are and how to configure them.
How to Disable "System program problem detected"
Linux systems running Ubuntu might show the message 'System program problem detected'. This article shows how to deal with the message.
Strace cheat sheet
The strace utility is diverse and helpful in performance tuning, troubleshooting, and monitoring process activity. Get the most out of this powerful tool!
Auditing systemd: solving failed units with systemctl
Sometimes systemd units like services and timers may fail. Learn how to troubleshoot such issues and resolve them much easier.
GPG key generation: Not enough random bytes available
A common error when creating keys with GnuPG is: Not enough random bytes available. In this article we have a look at the cause and solution.
Lynis stuck during testing
How to deal with issues when running Lynis and looks like it is stuck during any testing being performed. Finding the causing in a few quick steps.