Symptoms:
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Cloudlinux is running on the server.
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Alt-PHP and CageFS are installed and are in use.
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Installation or update of any APS application hangs or fails.
Cause
This is a Plesk bug with ID PPPM-5343 which is planned to be fixed in future Plesk updates.
Resolution
Until the issue is fixed, use the following workaround:
1) Log into Plesk.
2)Define absent PHP modules in Tools & Settings > PHP Settings > alt-php version > php.ini by adding following lines at the end of the file:
extension=mysqli.so
extension=mysqlnd.so
extension=json.so
3) Connect to the server via SSH.
4) Update PHP settings for all domains:
# plesk bin php_settings -u