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 Munin on Linux step by step: Ubuntu master, RHEL node, allow rules, firewall, Apache access and alert thresholds, with real output and graphs.
Continue Reading →Monitor remote Linux servers with Nagios and NRPE: install NRPE on Ubuntu and RHEL, build check_nrpe, fix allowed_hosts errors, and verify real alerts.
Continue Reading →Install Nagios Core 4.5.14 from source on Ubuntu 26.04 and RHEL 9: plugins, web UI login, adding a remote host, and a verified working setup with real output.
Continue Reading →Install Zabbix agent 2 on Ubuntu and RHEL 9, connect it to Zabbix server, add hosts manually or by autoregistration, and encrypt with PSK. Real output.
Continue Reading →Install Zabbix 7.4 on Ubuntu 26.04 with MySQL 8.4, Apache and PHP-FPM. Real output, the proxy_fcgi fix Apache needs, the setup wizard and a verified working setup.
Continue Reading →Set up nginx as a reverse proxy on Ubuntu or AlmaLinux: proxy_pass, real client IP headers, the trailing slash trap, 502 vs 504 and SELinux, all tested.
Continue Reading →Install a LEMP stack on Ubuntu 26.04 with nginx 1.28, MySQL 8.4 and PHP-FPM 8.5, tested with real output, fixes for 502 and 413 errors and a working test page.
Continue Reading →Install a LAMP stack on Ubuntu 26.04: Apache 2.4.66, MySQL 8.4 and PHP 8.5 over PHP-FPM, tested with real output, a virtual host and a working database page.
Continue Reading →Set up a self-hosted GitHub Actions runner on Ubuntu and AlmaLinux, register it, run a real job, and watch it survive a reboot. Includes a real AlmaLinux 10 bug.
Continue Reading →Monitor Linux CPU, memory, disk and network with top, vmstat, iostat, sar and PSI, tested under real load to show what a real bottleneck looks like.
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