Knowledge Base

Pre-migration checks show warning: The following Apache modules are not installed

Symptoms

After starting a migration in Tools & Settings > Migration & Transfer Manager the pre-migration check shows the following warnings:

Examples:

The following Apache modules are not installed on the destination server: <module_name>

Apache modules are not installed on the destination server: jk, bw. Please install and enable these modules to prevent possible problems.

Failed to synchronize subscription with plan
Migration tools tried to perform operation in 3 attempts:
Plesk error [1023]: bandwidth - Description: phosting__mod_bw_not_installed. Requested: 2097152. Allowed: -1

Cause

Same Apache modules on different Linux distributions have different names.

Resolution

Ignore the warning if the module is from this list. It's either already installed under a different name or was removed from the newer Apache version.

List of known modules for which the warning can be ignored:

Module name	Explanation
authnz_ldap	was used in Apache 2.2, removed in Apache 2.4
ldap	was used in Apache 2.2, removed in Apache 2.4
authn_default	was used in Apache 2.2, removed in Apache 2.4
authz_default	was used in Apache 2.2, removed in Apache 2.4
disk_cache	was used in Apache 2.2, renamed to cache_disk in Apache 2.4
cgi	was used in Apache 2.2, replaced by cgid in Apache 2.4
negotiation	used on deb like systems but not on RedHat based
setenvif	used on deb like systems but not on RedHat based
dir	used on deb like systems but not on RedHat based
autoindex	used on deb like systems but not on RedHat based
perl	not installed by default starting from Plesk 12.5. You will see such a message if the destination is higher than 12.5 and a source lower than 12.5
python	not installed by default starting from Plesk 12.5. You will see such a message if the destination is higher than 12.5 and a source lower than 12.5
php5	not installed by default starting from Plesk 12.5. You will see such a message if the destination is higher than 12.5 and a source lower than 12.5
mod_bw	if needed it can be installed in Tools & Settings > Updates and Upgrades > Add/Remove Components. Not available since Plesk 18.0.32 or in CentOS 8/RHEL 8
mod_jk	not supported by default starting from Plesk Onyx 17.8. After migrating to Plesk Onyx 17.8 or Obsidian, Apache Tomcat will be unavailable for installing and configuring via Plesk interface.