Step-by-step Linux, Kubernetes and cloud tutorials drawn from over 10 years of keeping production environments running. Every command tested, nothing hand-waved.
Monitor Docker containers with New Relic free tier: install the infrastructure agent, read container CPU against limits, query with NRQL and set real alerts.
Continue Reading →Install the New Relic infrastructure agent on RHEL 9 and Ubuntu, tune it, query server data with NRQL, set alerts and fix common errors.
Continue Reading →Infrastructure as code explained with real Terraform, OpenTofu and Ansible output: declarative vs imperative, immutable servers, tool comparison and GitOps.
Continue Reading →Monitor Nginx and PostgreSQL with Munin: enable stub_status, link the wildcard postgres plugins, test with munin-run, and read real graphs from a live node.
Continue Reading →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.
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