How to Use journalctl for Systemd Log Analysis on RHEL 7 On RHEL 7, the traditional syslog infrastructure is complemented — and in many cases replaced — by the systemd journal, managed by systemd-journald. The journalctl command is your primary interface for querying, filtering, and exporting log data collected by this service. Unlike flat text […]
How to Monitor Disk Usage with df, du, lsblk and ncdu on RHEL 7 Running out of disk space is one of the most disruptive events in a production Linux environment — it can crash databases, halt web servers, and fill system logs with errors. Proactive disk usage monitoring is therefore a non-negotiable part of […]
How to Schedule Automated Tasks with cron and anacron on RHEL 7 Automation is at the heart of effective Linux system administration. Red Hat Enterprise Linux 7 provides two complementary scheduling systems: cron for tasks that need to run at precise times on continuously running servers, and anacron for tasks that must eventually run on […]
How to Use rsync for Efficient File Synchronisation on RHEL 7 The rsync utility is the de facto standard for file synchronisation on Linux. Unlike a simple cp or scp, rsync transfers only the differences between source and destination, making it extraordinarily efficient for large datasets and incremental backups. On Red Hat Enterprise Linux 7, […]
How to Configure /etc/hosts, /etc/resolv.conf and DNS Resolution on RHEL 7 DNS resolution is one of the first things you troubleshoot when a server cannot reach other hosts by name. On Red Hat Enterprise Linux 7, name resolution is controlled by a layered system involving /etc/hosts, /etc/resolv.conf, /etc/nsswitch.conf, and NetworkManager. Understanding how these files interact […]
How to Manage Users and Groups with useradd, groupadd and passwd on RHEL 7 User and group management is one of the most fundamental administrative tasks on any Linux system. On Red Hat Enterprise Linux 7, the tools for creating, modifying and maintaining user accounts are robust, flexible and follow the standard POSIX conventions. Whether […]
How to Configure Log Rotation with logrotate on RHEL 7 Log files are essential for diagnosing system problems, tracking security events, and auditing application behavior. However, without proper management, log files grow without bound and can fill your disk, causing service outages and making historical logs difficult to navigate. logrotate is the standard log rotation […]
How to Use tmux for Terminal Multiplexing on RHEL 7 Every Linux administrator has experienced the frustration of losing a long-running process because an SSH connection dropped. tmux (terminal multiplexer) solves this problem by running your terminal sessions inside a persistent server process that survives disconnections. Beyond persistence, tmux allows you to split a single […]
How to Set Up a Bash Profile, .bashrc and Environment Variables on RHEL 7 A well-configured shell environment can dramatically improve your productivity as a Linux administrator. On Red Hat Enterprise Linux 7, Bash is the default login shell and it reads several configuration files at startup, each serving a distinct purpose. Understanding the difference […]
How to Configure sudo and Sudoers on RHEL 7 On a Red Hat Enterprise Linux 7 system, it is a fundamental security best practice to avoid performing routine administrative tasks directly as the root user. The sudo utility allows designated regular users to execute specific commands — or all commands — with root-level privileges, while […]
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