Failed to install WordPress on Cloudlinux: Non-zero exit status returned by script. file: /usr/share/aps_php/aps_php.php

Symptoms

• WordPress installation under Plesk > Domains > example.com > Install WordPress fails with the following error:

  PLESK_ERROR: Failed to install WordPress.
  Error establishing a database connection. This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at localhost:3306. This could mean your host’s database server is down.
  {“err_code”:true,”err_message”:”Error establishing a database connection. This either means that the username and password information in your wp-config.php file is incorrect or we canu2019t contact the database server at localhost:3306. This could mean your hostu2019s database server is down.”}

• WordPress installation under Plesk > Domains > example.com > Applications fails with the following error:

  PLESK_ERROR: Exception: Non-zero exit status returned by script.
  file: /usr/share/aps_php/aps_php.php

• LSPHP is selected as a PHP handler under Plesk > Domains > example.com > PHP Settings:

• mod_lsapi is used for managing LSPHP:

  # apachectl -M | grep lsapi
  lsapi_module (shared)

Cause

Currently, Plesk does not support mod_lsapi.

Resolution

As a workaround, set PHP Handlers provided by Plesk under Domains > example.com > PHP Settings as described in the article How to change PHP settings/version for a domain in Plesk? 

Note: if PHP Selector is used, check the article Why does phpinfo page show wrong information in CloudLinux when PHP Selector is used?
Contact CloudLinux support for further assistance regarding LSPHP