Step-by-step Linux, Kubernetes and cloud tutorials drawn from over 10 years of keeping production environments running. Every command tested, nothing hand-waved.
Install self-hosted GitLab CE on Ubuntu or RHEL with free Let’s Encrypt HTTPS, a firewall, locked-down sign-ups, daily backups and real test output.
Continue Reading →Fix git detached HEAD, set upstream tracking, switch with uncommitted changes, name branches and clean up safely, with output from Ubuntu and Rocky Linux.
Continue Reading →Git branches explained with output from Ubuntu and RHEL: create, switch, list, rename and delete local and remote branches, plus how they work internally.
Continue Reading →Bash scripting basics tested on Ubuntu and RHEL: variables, commands, arguments, exit codes, if and case, file tests, arithmetic, loops and a log checker.
Continue Reading →Bash functions, arrays, getopts, trap, regex and parameter expansion explained with tested Ubuntu and RHEL examples, plus one small script that uses them all.
Continue Reading →Bash for, while and until loops tested on Ubuntu and RHEL: arguments, reading files line by line, safe filenames, polling timeouts and subshell bugs.
Continue Reading →Learn htop, vmstat, iostat and sar with real output from Ubuntu and AlmaLinux. Find CPU, memory and disk bottlenecks fast, plus a 60-second triage routine.
Continue Reading →A practical AWS IAM guide: users, groups, roles, policy evaluation, STS, SSO profiles, Access Analyzer, boundaries and cross-account trust, with real CLI output.
Continue Reading →AWS Regions, Availability Zones, Local Zones and edge locations explained, with real CLI output, latency tests and tips for choosing a Region.
Continue Reading →Terraform CLI commands in practice: init, validate, fmt, saved plans, apply, destroy, outputs, state, graph and console, tested on Ubuntu and RHEL.
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