Restoring Deleted Files in Linux

FOG: Clone and Deploy Desktop Computers

Getting to Know Firewalld

Manage logs with logrotate

Fail2ban: A Password Protection Service

Cross-Platform Database Management with DBeaver

Hardening Linux for Production Use

Become a certified Linux Admin professional with the Linux Professional Institute LPIC-1 Systems Administrator certification.

Armed only with standard Linux tools, users can recover files, resurrect partitions, and rescue damaged media.

When something goes wrong on a system, the logfile is the first place to look for troubleshooting clues. Logstash, a log server with built-in analysis tools, consolidates logs from many servers and even makes the data searchable.

If you’re locked out of your Linux or Windows system, a handy Live Linux troubleshooting distro might be all you need to get back in. We’ll show you how to pick the lock with SystemRescueCd.

The imminent Windows 8 implementation of UEFI with Secure Boot adds an extra layer of complexity for some Linux users. We look at the problem and two solutions from Fedora and Canonical.

Even tried and trusted configurations that have proved their value through the years can be tripped up by special cases – for example, all of your users logging in with the same IP address. Experienced administrators and Bash aficionados will then enable debugging and launch a systematic search for configuration errors.

Debugging the kernel of a running operating system has always been tricky, but now the Qemu emulator supports cross-platform kernel and module debugging at the programming language level.

Whether you’re the sys admin of a home network or of a company-wide network of dozens or even hundreds of machines, some basic principles of debugging will come in handy.