Applicable to:
- Plesk for Linux
Symptoms
Pre-migration check shows the following warnings:
Examples:
PLESK_WARN: The following Apache modules are not installed on the destination server: <module_name>
PLESK_WARN: Apache modules are not installed on the destination server: jk, bw. Please install and enable these modules to prevent possible problems.
PLESK_WARN: 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
There are 3 general reasons why you may see a message about the missing module:
- Apache version differs on source and destination. Because of that module name may differ and not detected properly
- Also depending on OS module names may differ as well, for example on Debian 7 and Centos 6.
- There was some additional module installed on source server which is not installed by default on destination.
Resolution
The following solutions may be applied:
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 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. https://support.plesk.com/hc/en-us/articles/360000322173-Does-Plesk-Onyx-Obsidian-support-Apache-Tomcat- |
If additional modules were manually installed on the source server, follow these steps to add it to the target server:
-
Connect to the destination server via SSH.
-
Install the missing module as follows depending on the OS installed:
Note: change the "<module_name>" in the command below to the correct one.
-
For RPM-based systems:
# yum install <module_name>
-
For Debian-based systems:
# apt install <module_name>
Note: Sometimes module name in the error message does not coincide with the corresponding package.
In order to find the correct module name use the package search tool:-
For RPM-based systems:
# yum search <module_name> | grep -i apache
-
For Debian-based systems:
# apt search <module_name> | grep -i apache
Note: change the "<module_name>" in the command below to the correct one.
-
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