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. |
|
mod_http2, mod_hcheck, mod_proxy_http2, mod_proxy_uwsig |
These modules are available in Apache starting with 2.4.17 version and higher. A warning might appear when performing a migration to CentOS7 where the old Apache version is shipped by default. |
Note: for other modules refer to this instruction if a manually installed module is missing from the destination server.