When a Linux system starts, several components work in sequence before a login prompt appears. Firmware checks the hardware, a bootloader selects the operating…
Articles
Network bonding joins two or more physical network interfaces into one logical link. On CentOS, this can keep a server reachable when a cable, network adapter,…
Fedora’s repositories cover most everyday applications, but administrators sometimes need a newer release, an optional feature, or software that has not yet…
A reverse proxy accepts requests from clients and forwards them to an application server on a private network. With Nginx in front of a web application, the…
Linux treats many resources as files, including regular documents, sockets, devices, pipes, and active network connections. The lsof command exposes these…
DNS problems can make a healthy Linux server appear offline. Web pages may fail to load, package repositories can time out, and services may report misleading…
Git is a distributed version control system used to track source code, configuration files, scripts, and documentation. On a CentOS server, it helps…
Running a mail server on Fedora is a useful administration exercise, but reliable email requires more than installing one package. Postfix handles SMTP…
On older Red Hat Enterprise Linux systems, iptables provides a direct way to control IPv4 traffic. It evaluates packets against an ordered ruleset and accepts,…
Linux services leave a detailed trail of events in the systemd journal. Learning how to query that trail with journalctl makes it easier to investigate failed…