Last modified: July 19, 2022
cPanel, L.L.C. recommends that only experienced system administrators attempt to perform the steps in this document. cPanel, L.L.C. is not responsible for any data loss that an attempt to perform these steps causes.
cPanel, L.L.C. supports the use of cPanel & WHM inside of a Linux Container (LXC). An LXC container provides an environment that resembles a standard Linux installation, but does not require a separate kernel. For more information about LXC containers, read the Linux Containers documentation.
Run in a Linux Container
To run cPanel & WHM inside an LXC container, we strongly recommend that you use the following settings:
We strongly recommend that you use Red Hat® Enterprise Linux (RHEL) 7 or CentOS 7 as your server’s LXC host. This configuration ensures the best compatibility with cPanel & WHM. While other Linux distributions may work, they require that the system administrator perform additional steps that we do not support.
We have not tested LXC on AlmaLinux OS 8 or CloudLinux 8 servers.
A CentOS 7 or an RHEL 7 installation require additional steps to use as a guest.
Privileged vs unprivileged containers
cPanel & WHM functions in both privileged and unprivileged containers. We strongly recommend that you run cPanel & WHM in a privileged container, because it expects unrestricted access to the system.
The following limitations are inherent to an unprivileged container:
The host operating system treats the
rootuser as a non-
You cannot raise the hard limit of a process if you previously lowered it. This action could cause EasyApache 4 to fail.
Subtle behavior differences may occur.
Required changes for CentOS 7 or RHEL 7
You must make the following configuration changes to run cPanel & WHM inside an LXC container:
After you create the LXC container, change the
lxc.includeline in the
lxc.conffile to the following line:
lxc.include = /usr/share/lxc/config/fedora.common.conf
lxc.conffile to drop
setpcapcapabilities. To do this, comment out the following lines:
# lxc.cap.drop = setpcap # lxc.cap.drop = setfcap
Some system configurations will not run properly with cron inside an LXC container. Individual cron jobs fail to execute even though the cron daemon is active. This issue is a direct result of the incompatibility between the container environment and the
To resolve this conflict, disable the
pam_loginuid module for cron with the following comment in the
Updates to your cron package may cause the service to reactivate. Inspect this file for changes after each system update.
If your system uses AppArmor, you must also uncomment the following line in the
AppArmor version 2.0 and earlier
lxc.aa_profile = unconfined
AppArmor version 2.1 and later
lxc.apparmor.profile = unconfined