Latest Articles - Page 27

Important Linux sysctl parameters for performance — what each knob controls, what to check on your host, and the impact when you raise or lower it, without copying paste-and-go sysctl.conf lists.

The OpenSSH client reads ~/.ssh/config for host aliases, keys, ports, ProxyJump bastions, and connection reuse—this guide walks through examples and how to verify them with ssh -G.

Learn Linux setgid on directories and executables: chmod g+s, 2775 group inheritance, write and plocate examples, s vs S, find, and when to use setgid on shared folders.

Learn Linux setuid on executables: what chmod u+s and 4755 do, why passwd uses setuid, lowercase s vs uppercase S, how to find setuid files, and when not to add your own.

Learn the Linux sticky bit on directories: what chmod +t and 1777 do, why /tmp uses them, lowercase t vs uppercase T, how to remove the bit, and how to find sticky directories.

Suppress sysctl stable_secret read errors when piping sysctl -a to grep, understand why net.ipv6.conf.*.stable_secret returns I/O error, and check IPv6 settings without disabling IPv6.

sysctl reads and writes kernel tunables exposed under /proc/sys. Use it to inspect dotted parameter names, set runtime values with -w, filter keys with -a -r, and load drop-in files with -p or --system.

List systemd services with systemctl list-units and list-unit-files — filter running, enabled, disabled, failed, and inactive units, compare loaded vs installed unit files, and check one service with is-active and …

Extract tar.gz and tgz archives with GNU tar, decompress plain .gz files with gunzip, list members without unpacking, and avoid mixing up gzip streams with tar archives.

Check and change ulimit resource limits in Linux, including open files, soft vs hard limits, persistent limits.conf settings, systemd LimitNOFILE, and prlimit for running processes.

Learn how to exclude selected users from pam_faillock account lockout on RHEL, Rocky Linux, AlmaLinux, and Oracle Linux using authselect and PAM rules.

This tutorial covers solutions for Python Lists question from Hacker Rank using if statements, map and len() method Using the split() function

In this tutorial we cover different methods to solve python print function hackerrank solution

There are 3 different methods to use SQL UPDATE from Select. Using INNER Join, Using Merge statement and using sub query statement.

Extract one file, multiple files, directories, wildcards, or symlinks from a tar.gz archive with tar, including custom destinations and --strip-components.

There are two types of polymorphism in Java: compile-time polymorphism and runtime polymorphism.

Find where OpenSSL keeps openssl.cnf, trust-store certificates, libssl libraries, and the openssl binary on Linux and Windows. Use openssl version -d, which openssl, ldconfig, and OPENSSL_CONF when paths differ between …

Learn how Linux applications are empowering tech-savvy kids to transform the classroom. Also, understand how to use this excellent software for education.

machine learning has discovered computer video games as an interesting and rewarding area. Also, the video game market has become a prominent and proven global industry.

Create, copy, move, rename, and delete files and directories in Linux with touch, mkdir, cp, mv, rm, and rmdir—plus wildcards, brace expansion, and safe verification with ls, stat, and du.

Part 2 of the Helm hybrid operator tutorial: the features the pre-built helm-operator binary cannot provide, written in roughly 200 lines of Go on top of the foundation built in Part 1. Custom status fields including a …

Part 2 of the Helm-based operator tutorial picks up the moment Part 1 ends - you have a deployed operator with a running CR. This guide walks the rest of the pre-built helm plugin (helm.sdk.operatorframework.io/v1) in …

Extend or resize a non-LVM root partition in Linux with parted or fdisk when unallocated space exists after the target partition, then grow ext4 with resize2fs without reformatting.

Exclude one or multiple users from an OpenSSH Match Group with negated User patterns, validate sshd_config safely, and verify the effective SSH settings.

Create ext4, XFS and VFAT filesystems in Linux with mkfs: identify the right block device, add labels, mount and unmount, read capacity correctly, and check or repair each filesystem type.

Schedule one-time tasks in Linux with the at command: start atd, write relative and absolute time specs, list jobs with atq, inspect with at -c, cancel with atrm, capture job output, and control access with at.allow and …

Update 389 Directory Server safely with dnf, pre-upgrade health checks, verified backups, standalone and rolling replica updates, post-upgrade validation, and recovery when a package update fails.

Different types and formats of SQL date format explained with examples. SQL datetime format syntax, type and examples. sql server date format.

Step by step guide to build ceph storage cluster in Openstack CentOS 7 Linux on virtual machine. Confiure OSD, mon using ceph-deploy tool for ceph cluster

Understand kernel-core on RHEL, the difference between kernel, kernel-modules-core and kernel-modules, which packages you need, and how DNF updates them safely.