Notes from real client work
Hard-won lessons from shipping WHMCS modules, securing servers, and automating hosting businesses - written so you can apply them today.
The CloudLinux Manager banner about rebooting for kernel updates explained — what it actually means, the safe reboot procedure, KernelCare setup, and what to do when the reboot fails.
WHMCS official minimums are a floor, not a target. The real-world server spec for a hosting business — by customer count, with PHP / MySQL / OPcache / Redis / TLS configuration.
Half the WHMCS support tickets I see are cron-related. The exact line that should be in your crontab, where it should run, how to verify it works, and how to prevent overlaps with flock.
The runbook I use on every WHMCS upgrade — pre-checks, staging test, the upgrade itself, post-upgrade verification, and how to roll back when it goes sideways.
A working diagnostic flowchart for WHMCS issues — white screens, cron failures, missing emails, payment-recording bugs, license errors, database issues, and what to send WHMCS support when you escalate.
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