CloudLinux Knowledge Base
In this category, you will find CloudLinux OS-related guides, FAQs, setup instructions, and troubleshooting articles written by our Support Engineers. Those will help you to tackle the most frequent problems, answer the most frequent questions, and explain non-trivial setups.
Visit our Documentation page for administration guides and manuals where all our features are described in detail: docs.cloudlinux.com
Getting Started
- Hosting accounts have exceeded the allowed limit
- ERROR: SSL handshake to ‹RetryServer for xmlrpc.cln.cloudlinux.com/XMLRPC/› failed
- Failed to download metadata for repo 'cloudlinux-x86_64-server-8': Cannot download repomd.xml
- Does webuzo control panel support Cloudlinux OS?
- modprobe: ERROR: could not insert 'kmodlve': Invalid argument / cloudlinux-default profile does not switch to -cgv1 after tuned-profiles-cloudlinux update
- Vulnerabilities CVE-2025-6018 and CVE-2025-6019
Known Issues
- CVE-2026-31431 Impact on CloudLinux Systems & KernelCare patching
- yum: Problem: package alt-python27-cllib conflicts with rhn-client-tools ‹ 1:2.8.16-14
- Common `cldiag --all` Errors & Fixes
- FAILED: Details: hidepid protection disabled
- CVE-2026-72389 (bridge-stp-uaf) — CloudLinux Exposure, Mitigation, and Fix Status
- RtabRace CVE-2026-68138: CloudLinux & KernelCare coverage
FAQ
- How to Install CloudLinux 8/9/10 and migrate users along with CloudLinux settings?
- How to prepare your server(s) before ticket creation and provide replication steps for the Support Team
- How to authenticate your server for Support Team and use the Secure Access Form?
- How do I uninstall CloudLinux or its features?
- CloudLinux Mirror System: What Is Changing and How to Migrate
- Is it possible to convert RockyLinux 10 to CloudLinux 10?
PHP Selector
- Per Domain Settings tab is missing or does nothing when MultiPHP Manager is disabled
- INTL extension is broken for ea-php
- [Errno 2] No such file or directory: '/etc/cl.selector.conf.d/phpextdesc.txt'
- Your PHP installation appears to be missing the MySQL extension which is required by WordPress.
- PHP Selector Integration with cPanel
- PHP Selector Integration with Plesk Panel
Limits & LVE Stats
CageFS
- The CageFS plugin is no longer available
- CageFS can't start - Error: current running kernel is NOT supported
- Crontab fails with "RuntimeError: Operation not permitted" for caged users after the CageFS 7.6.44 update
- CloudLinux 8: CageFS 7.6.40 breaks lsphp spawning on LiteSpeed Enterprise + Plesk (HTTP 503 outage)
- Is CageFS Compatible with Imunify360?
- FAILED: There are missing mount points: /usr/local/cpanel/htdocs (cPanel v134)
Apache mod_lsapi PRO
- 503 after server reboot
- High Load/Hanging Cleanup Processes After liblsapi/mod_lsapi 1.1.85 Upgrade
- Additional .ini files parsed: (none) on the php --ini
- Error with mod-lsapi version 1.1-81 on DirectAdmin servers.
- mod-lsapi 1.1-81 on DirectAdmin server: undefined symbol: lscapi_set_criu_socket_path
- Cannot load modules/mod_lsapi.so into server: /etc/httpd/modules/mod_lsapi.so: undefined symbol: lscapi_create
MySQL Governor
CloudLinux Kernels
- How to configure kdump to save vmcore on remote server via ssh
- There are no kernels in the Grub2 menu during the reboot
- How to choose the correct kernel to boot on CloudLinux OS
- CloudLinux 8/9: kmodlve Deferred at Boot — False-Positive Intel IBT Check (lve/liblve 2.2-8+)
- Kernel Local Privilege Escalation CVE-2026-64531 (OVSwrap, Open vSwitch) — Affected Status and Fix
- CVE-2026-64600 (RefluXFS) Impact on CloudLinux Systems & KernelCare Patching
Python/Ruby/NodeJS Selectors
- How to Install Python Selector cPanel
- NodeJS Selector not Working with an Error "Can't acquire lock for app"
- Error: Transaction test error: file /opt/alt/alt-nodejs2X/root/usr/lib/node_modules/npm/node_modules/node-gyp from install of alt-nodejs2X-npm-10
- Setup Ruby Applications keeps loading and produces Error 500
- NodeJS / Python Selector error | BlockingIOError: [Errno 11] Resource temporarily unavailable
- Error in Python application - IndexError: string index out of range
AccelerateWP
- AccelerateWP reseller support
- AccelerateWP 1.1-42 incompatibility after WordPress 7.1 update
- Image optimization is temporarily paused. Your site has reached the monthly usage limit.
- How to enable image optimization in Dashboard?
- Redis extension is not loaded for selected php version
- AccelerateWP warning: Please, disable or remove "snuffleupagus" PHP extension.
ELevate project
- You have MySQL 5.7 installed. This version is not available for CloudLinux 8.
- Elevate error: cache-only enabled but no cache for 'cloudlinux-x86_64-server-8'
- Elevate failed during stage 4: Unable to find a match: ea-php56-php-suhosin
- Failed to create directory /var/lib/leapp/el8userspace//sys/fs/selinux: Read-only file system
- Elevate CL7 with hybrid kernel error
- Upgrade from CloudLinux 8 to CloudLinux 9 using Elevate
X-Ray
Centralized Monitoring
- Centralized Monitoring Error: Server linking is forbidden
- How does Centralized Monitoring works?
- Centralized Monitoring for Reseller's Users
- FAILED: Service is not active. The server can't collect and send statistics to Centralized Monitoring if service cl_node_exporter isn't present, enabled and active.
- Centralized Monitoring is not displaying the statistics
Yum & RPM Problems
- Error: Failed to download metadata for repo 'cloudlinux-x86_64-server-8': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
- File /usr/lib64/mysql/libmysqlclient.so.18.0.0 from install of cl-MariaDB103-libs-10.3.39-3.el7.cloudlinux.x86_64 conflicts with file from package mysqlclient18-compat-10.1.28-1.el7.cloudlinux.x86_64
- CloudLinux 8 cPanel: DNF AppStream Perl modular dependency conflicts
- Update /scripts/update-packages fails on CloudLinux 7 with criu-lve, liblsapi and cloudlinux-venv dependency errors
- Unable to install almalinux-release-testing on CloudLinux 9 because cloudlinux-release obsoletes almalinux-gpg-keys
- Yum Error: Repository cloudlinux-x86_64-server-7 Listed More Than Once in Configuration | with cloudlinux-release-7.9-2.15.el7
General Administration & non-CloudLinux Guides
- nothing provides libraw_r.so.23()(64bit) needed by ImageMagick-libs-6.9.12.93-2.el9.x86_64 from epel
- How to enable or disable yum/dnf repo
- How to decode/get the actual Cloudlinux OS license key from Plesk license
- CloudLinux Manager Blank Page in DirectAdmin
- Unable to install CloudLinux due to the "You have users in the group 'clsudoers', 'clsupergid' or both." error
- What to Do if Slab Cache Grows and Negatively Impacts the Server Performance
Fighting High Load
Registration Cases
- CloudLinux OS license registration fails with "Your IP is blacklisted"
- CloudLinux Solo to Admin - The license you are trying to register with allows a maximum of X hosting accounts
- Server license check failed: _cffi_backend.cpython-36m-x86_64-linux-gnu.so: invalid ELF header
- Error: License not found for key/IP!
- rhn-plugin: Network error: ECONNRESET
- The "License not found for key/IP" error during the CloudLinux license activation.