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For cPanel & WHM version 64


Before you begin the installation process, you can customize the configuration for certain portions of cPanel & WHM.

Installation methods

New installations of cPanel & WHM use the fast installation method by default. This method handles certain aspects of cPanel & WHM differently to drastically reduce installation time. For example, the fast installation method:

  • Uses prebuilt locale databases, while legacy installations run the /scripts/build_locale_databases script to compile locale databases during installation.
  • Uses tarballs to download certain code cPanel & WHM files.
  • Uses system RPMs, if they are available, to set up the Perl local::lib library.

Legacy installation method

Some system administrators may wish to override this default in order to use the legacy installation method.


The legacy installation method requires substantially more time than the fast installation method. We strongly recommend that you use the fast installation method.

To disable the fast installation method, create the /etc/cpanel/disable_fast_install touch file before you begin the cPanel & WHM installation process.

Basic server setup

The /etc/wwwacct.conf file contains the basic setup information for cPanel & WHM. After you install cPanel & WHM, you can find and edit this information in WHM's Basic WebHost Manager Setup interface (Home >> Server Configuration >> Basic WebHost Manager Setup).

To customize this configuration, perform the following steps:

  1. As the root user, create the /etc/wwwacct.conf file.

  2. Enter all of the wwwacct.conf file's parameters, with one entry per line:

    You must include all of the parameters in your /etc/wwwacct.conf file, even if you do not specify a value for a parameter.

     Click for an example file to copy-paste from...
    LOGSTYLE combined
  3. Specify the following required parameter values:
    • NS and NS2
  4. Specify values for any other parameters that you wish to configure.


    Separate each parameter and its value with a space. For example:


Configuration values

You can configure the following values in the /etc/wwwacct.conf file:

  • ADDR — Your server's shared IPv4 address.
  • ADDR6 — Your server's shared IPv6 address.
  • CONTACTEMAIL — The system administrator's contact email address.
  • CONTACTPAGER — The number to which the server sends Short Message Service (SMS) notifications.
  • DEFMOD — The default cPanel theme that you wish to use for newly-created accounts.


    This value does not impact cPanel theme behavior for existing accounts.

  • ETHDEV — The default ethernet device. This parameter defaults to eth0 value on Linux servers.


    Specify venet0:0 if the server runs Virtuozzo®.

  • HOMEDIR — The path to the default home directory.
  • HOMEMATCH — A string that determines which partitions to use as home directories for new accounts. (For example, a value of users matches system mounts of users, users1, or users3.)
  • LOGSTYLE — The Apache log format to use.

    Always set combined as this parameter's value.

  • NS, NS2, NS3, and NS4 — Nameservers to add to DNS zones by default.


    If you do not specify values for NS and NS2, account creation will fail.

  • NSTTL — The default time to live (TTL) value that DNS zones will use.
  • SCRIPTALIAS — Whether the system aliases a /cgi-bin/ directory on account creation.


    You must enter a value of y or n.

Configuration settings

When you install cPanel & WHM, the system reads the /root/cpanel_profile/cpanel.config file. This file stores the settings that WHM's Tweak Settings interface (Home >> Server Configuration >> Tweak Settings) contains, as well as various configuration settings for other cPanel & WHM features. The system uses these settings to set the values in the /var/cpanel/cpanel.config file.


  • Some of the values that the /root/cpanel_profile/cpanel.config file contains are dynamic, or require specific values.
  • You can configure the version of MySQL or MariaDB to use in the /root/cpanel_profile/cpanel.config file's mysql-version key before you install cPanel & WHM. However, we do not support the configuration of existing installations of cPanel & WHM.
  • If you set MySQL® to version 5.1 (mysql-version=5.1) or lower when you install cPanel DNSONLY, the installation process automatically upgrades the MySQL installation to version 5.5. cPanel & WHM version 11.46 discontinued support for MySQL 5.1 and lower, and cPanel DNSONLY does not include an easy way in which to upgrade your MySQL installation.
  • For more information, read our cpanel.config file documentation.

To set these parameters, perform the following steps:

  1. As the root user, create the /root/cpanel_profile/cpanel.config file.
  2. With one entry per line, list the parameters and values that you wish to configure in key=value format. For example, to preconfigure your server to deny the nobody user the ability to send email to a remote address, add the nobodyspam=1 line to the /root/cpanel_profile/cpanel.config file before you install cPanel & WHM.

Account restoration

The /etc/cpanelacctrestore file contains a list of accounts to automatically restore during the cPanel & WHM installation process. You can use this file to restore accounts to a freshly-installed server.


When you create a backup file, you must use one of the following formats:

  • cpmove-{USER}
  • cpmove-{USER}.tar
  • cpmove-{USER}.tar.gz
  • {USER}.tar
  • {USER}.tar.gz
  • backup-{BACKUP-DATE_TIME}_{USER}.tar
  • backup-{BACKUP-DATE_TIME}_{USER}.tar.gz

To restore a list of cPanel accounts during the cPanel & WHM installation process, perform the following steps:

  1. As the root user, use a text editor to create the /etc/cpanelacctrestore file.
  2. With one entry per line, list the user account names.
  3. Upload the backup file or files to one of the following directories:
    • /home
    • /home2
    • /home3
    • /root
    • /usr
    • /usr/home
    • /web

Release tiers

The /etc/cpupdate.conf file determines the product version for your installation of cPanel & WHM. This file also controls when your server performs the automatic upgrades to new major versions of cPanel & WHM.

When you preconfigure this file, cPanel & WHM will install the specified cPanel & WHM version or the major version that corresponds to the specified release tier.


To preconfigure your release tier, perform the following steps:

  1. As the root user, create the /etc/cpupdate.conf file.

  2. In the /etc/cpupdate.conf file, use the CPANEL parameter to set your desired release tier. For example, to configure your server to use the STABLE tier, add CPANEL=stable to the /etc/cpupdate.conf file.

The /etc/cpsources.conf file

The /etc/cpsources.conf file determines the locations from which your server downloads updates. By default, cPanel & WHM servers retrieve updates directly from cPanel, Inc. via our pool of update servers.


Invalid modifications to this file may cause serious problems. We strongly recommend that you do not modify this file unless you understand the full technical ramifications of your actions and can maintain these customizations.

Invalid data

If you see the following error in your server's logs, your /etc/cpsources.conf file likely contains invalid data:

[2015-12-08 14:12:54 +0200] ***** FATAL: Unable to retrieve tier version info: timeout

To resolve this issue, move the /etc/cpsources.conf file to another location, then run the /usr/local/cpanel/scripts/upcp script. The system will automatically restore a valid cPanel-supplied version of the /etc/cpsources.conf file.


To disable FastUpdate on your server, SSH to your server as the root user and run the following command:

touch /var/cpanel/never_ever_use_fast_update_not_even_a_check

To reenable FastUpdate on your server, run the following command as the root user:

rm /var/cpanel/never_ever_use_fast_update_not_even_a_check


Yellowdog Updater, Modified (yum) is an RPM package management tool for Linux servers that automatically installs with your operating system. 


When you install cPanel & WHM, you must only use vendor-provided repositories. Third-party repositories may replace vital parts of the system and cause unexpected results.

Exclude packages

Because cPanel & WHM handles its own installation of services through the rpm.versions system, you must exclude several packages before you install cPanel & WHM.

To exclude these packages, perform the following steps:

  1. As the root user, use a text editor to edit the /etc/yum.conf file.

  2. Locate the line that begins with exclude= and confirm that it contains the following entries:

    bind-chroot dovecot* exim* filesystem httpd* mod_ssl* mydns* mysql* nsd* php* proftpd* pure-ftpd* ruby* spamassassin* squirrelmail* 
    1. If you do not find the line that begins with exclude= , insert it in the file under the [main] line as one line of code.

  3. Save and close the file. You may then use your preferred method to install yum on your server.

Remove yum groups


To obtain a list of yum groups, run the yum grouplist command.

Before you install cPanel & WHM, make certain that the following yum groups are not installed on your server:

  • FTP Server
  • GNOME Desktop Environment
  • KDE (K Desktop Environment)
  • Mail Server or E-mail Server
  • Mono
  • Web Server
  • X Window System

To remove a yum group, run the yum groupremove command. For example, to remove the Mono and Mail Server groups, run the following command:

yum groupremove "Mono" "Mail Server"


EasyApache 4

cPanel & WHM installs EasyApache 4 (Home >> Software >> EasyApache 4) by default.

EasyApache 4 allows you to preconfigure your profile before you install cPanel & WHM on your server. To preconfigure your profile before install, create the /etc/cpanel_initial_install_ea4_profile.json file. The installation process installs this profile then copies it to the /etc/cpanel/ea4/profiles/custom/ directory when complete.


  • The /etc/cpanel_initial_install_ea4_profile.json file must exist as both a valid JSON file and a valid EasyApache 4 profile. If your JSON file contains errors, no data, or the installation fails, the system installs the default EasyApache 4 profile instead.
  • If your selected version of EasyApache fails to build, the installation process continues and you must troubleshoot the issue manually.
  • If your system runs CloudLinux™, the system installs the CloudLinux EasyApache 4 repository and the default CloudLinux profile.
  • Systems that do not run CloudLinux install cPanel & WHM's EasyApache 4 repository and default profile.

For information about how to create an EasyApache 4 profile, read our EasyApache 4 - Create a Profile documentation.

EasyApache 3


We no longer develop and only provide security updates for EasyApache 3. We will deprecate EasyApache 3 on December 31, 2018. After that date, we will no longer update EasyApache 3. In cPanel & WHM version 78, we will remove support for EasyApache 3. We strongly recommend that you install EasyApache 4.

For more information, read our cPanel Long-Term Support documentation.

If you wish to install EasyApache 3 on your system, you can use EasyApache 3 to configure the Apache web server before installation. To do this, you must also access an existing cPanel & WHM server that runs EasyApache. EasyApache allows you to adjust several configuration options.


  • You must create the /etc/install_legacy_ea3_instead_of_ea4 touch file to install EasyApache 3 by default on a fresh install of cPanel & WHM version 58 or higher.
  • The cPanel & WHM installation process installs Apache 2.4 and PHP 5.5 by default.

To create and customize a new profile, perform the following steps:

  1. Create a new EasyApache profile.
    • Command line — Log in to the existing server through SSH as the root user and run the /scripts/easyapache script.
    • WHM — Log in to WHM on the existing server as the root user and use the EasyApache 3 interface (Home >> Software >> EasyApache 3).
  2. Run EasyApache 3.
  3. In the Exhaustive Options List stage, perform the following steps:
    1. Assign a file name, a display name, and a brief profile description to the new EasyApache profile.
    2. Select Save Only (Do Not Build). Your server stores the new profile in the /var/cpanel/easy/apache/profile/custom/ directory, but does not recompile Apache and PHP.
    3. Run the scp command to copy the profile to the /etc/cp_easyapache_profile.yaml file on the new server.
  4. To create a /var/cpanel/easy/apache/prefs.yaml file, which stores your preferences separately from the build profile, perform the following steps:
    1. Set the desired preferences in EasyApache.
    2. On your new server, run the following command:

      mkdir -p /var/cpanel/easy/apache/ 
    3. Copy the /var/cpanel/easy/apache/prefs.yaml file from the existing system to the /var/cpanel/easy/apache/ directory on the new server.
    4. Place your build profile in the /etc/cp_easyapache_profile.yaml file on the new server.

Override customizations

To override the cPanel & WHM installation system's default settings or any customizations that you made, run the /usr/local/cpanel/scripts/copy-etc-files script. This script performs the following actions:

  • Creates copies of the the contents of your current system's /etc/bashrc, /etc/issue, and /etc/ files.
  • Stores the copied files in the /usr/local/cpanel/etc directory.
  • Replaces the customized files with the copied files' contents.

Additional documentation