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CloudLinux articles

Isolates each tenant in its own lightweight container. CageFS, LVE, and KernelCare for live kernel patching.

23 articlesCloudLinux licensing & pricing →

Tutorials & how-tos · 16 Migration guides · 1 Comparisons · 1 Troubleshooting · 3 Pricing & licensing · 1 News & changelogs · 1

Tutorials & how-tos

All tutorials & how-tos →

Tune mod_lsapi on CloudLinux: connection pool and LVE limits

mod_lsapi is the leanest PHP handler for high-density cPanel, but the stock config leaves performance on the table. How to tune connection pool, backend children, and LVE limits without 508s.

CloudLinux SecureLinks: stop symlink attacks on shared cPanel hosting

Configure CloudLinux SecureLinks to block cross-account symlink and hardlink attacks on shared cPanel servers — kernel sysctls, Apache directives, and verification.

CloudLinux reseller limits: cap LVE per reseller in WHM

How to use CloudLinux reseller limits to cap CPU, memory, and entry processes per reseller in WHM — so one reseller's accounts can't take down the whole shared server.

Add custom binaries to the CageFS skeleton on CloudLinux

Expose Composer, WP-CLI, Node tools, or any custom binary inside CageFS so end users can run them over SSH or cron without leaking the rest of the host.

Read LVE Manager Statistics to find the offending account

Use WHM's CloudLinux LVE Manager Statistics to map PMemF, EPf, and NprocF columns to the user, script, and time window causing the spike.

KernelCare live patching on cPanel: zero-reboot kernel CVEs

How to install KernelCare on a cPanel server so kernel CVEs patch live without a reboot — verification commands, rollback steps, and the userspace caveat.

CloudLinux X-Ray: profile slow PHP code in production

Enable X-Ray on a CloudLinux server to capture stack traces from slow PHP requests, identify hot functions and queries, and fix performance issues before customers churn.

Set up CloudLinux Python Selector on a cPanel server

Let shared-hosting customers pick their own Python runtime per app — Django, Flask, or FastAPI on Python 3.9 through 3.12, isolated under CageFS, managed from cPanel. End-to-end in about 30 minutes.

Set up CloudLinux Node.js Selector on a cPanel server

Give shared-hosting customers their own Node.js runtime per app — version 18/20/22, isolated under CageFS, managed from cPanel's Setup Node.js App icon. End-to-end in about 25 minutes.

CloudLinux Hardened PHP: legacy PHP without the CVE risk

Backported security fixes for PHP 5.6 through 8.1 let you keep legacy WordPress and Magento customers running on the version their plugins actually need, without the CVE backlog.

Set up CloudLinux AccelerateWP on a cPanel hosting server

Ship one-click WordPress acceleration to every cPanel user. Install AccelerateWP, configure the object cache, set feature policies, and avoid the conflicts that break existing caching plugins.

MySQL Governor modes — when to use abusers, all, or off

The four MySQL Governor modes explained for shared cPanel hosting — when each makes sense, the dbctl commands that actually matter, and the defaults that survive real WordPress traffic.

Install Imunify360 on a cPanel and CloudLinux server

A 20-minute install of Imunify360 on a cPanel + CloudLinux node — license activation, the installer, Proactive Defense, and the three default settings to change before letting customers log in.

How to install CloudLinux OS on an existing cPanel server

Convert a CentOS, AlmaLinux, or Rocky cPanel server to CloudLinux OS in place — license activation, cldeploy, CageFS, and verifying the lve kernel after reboot.

Set up CloudLinux PHP Selector on a cPanel server

Let each cPanel user pick their own PHP version and extensions, without breaking shared-server stability. Install alt-php, enable CageFS, and avoid the three configuration mistakes that turn this into a support flood.

CloudLinux LVE tuning without angry customers

How to set LVE limits that keep a shared cPanel server stable under load — without flooding support with 508 errors and slow-loading WordPress sites.

Migration guides

All migration guides →

Migrating a CloudLinux 8 or 9 cPanel server to CloudLinux OS 10

CloudLinux OS 10 ships no ISO and no in-place ELevate path from 8 or 9 — here's the fresh-install-plus-transfer route, what changed under the hood, and whether you should move yet.

Comparisons

All comparisons →

CloudLinux vs AlmaLinux for hosting providers

Where AlmaLinux replaces CentOS for free and where CloudLinux's LVE, CageFS, and MySQL Governor still earn the license fee on shared servers.

Troubleshooting

All troubleshooting →

Fix 508 Resource Limit Is Reached on CloudLinux cPanel

A 508 error means one LVE limit got hit — usually entry processes. The decision tree for finding which limit, which user, and whether to raise it or fix the cause.

Fix CloudLinux "No valid license found" registration errors

Work through the CloudLinux "No valid license found" error in order — IP-based vs key-based registration, stale CLN server entries after a migration, and blocked outbound to cln.cloudlinux.com.

Fix 'Cannot manage PHP versions' when CageFS is disabled

Resolve the CloudLinux PHP Selector error by removing pam_lve from sudo, rebuilding CageFS, and enabling CageFS for the affected user.

Pricing & licensing

All pricing & licensing →

CloudLinux OS vs CloudLinux OS for cPanel: which license do you need?

CloudLinux comes in two per-server editions, both priced the same. Here is what each one includes, which control panels they fit, and how the per-server pricing works.

News & changelogs

All news & changelogs →

RtabRace (CVE-2026-68138): mitigating the kernel race on CloudLinux

A traffic-control race in the Linux kernel lets any shell user panic a shared server on demand. CloudLinux 8 and 7 Hybrid need the sysctl mitigation today — here's the command and the patch status.

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