An error when accessing Plesk: /usr/sbin/postconf: error while loading shared libraries: libmysqlclient.so.16

Symptoms

The following error occurs when accessing Plesk:

CONFIG_TEXT: No results for "MT:f517f0df540c7f5b511153bb17e09b7f MG:8f40dd97bd9b1468219247655c7bee49 mailmng-server failed: Fatal error: plesk::Exc<&(plesk::ExecCmd::Failed(bool)), plesk::ExDefault>

The following errors can be found in /usr/local/psa/admin/logs/panel.log:

CONFIG_TEXT: ERR [util_exec] proc_close() failed ['/usr/local/psa/admin/bin/mailmng-server' '--features'] with exit code [1]
mailmng-server failed: Fatal error: plesk::Exc(Execution of /usr/sbin/postconf -d -h mail_version failed with return code 127.
Stderr is
/usr/sbin/postconf: error while loading shared libraries: libmysqlclient.so.16: cannot open shared object file: No such file or directory
)
exit status 1

Cause

Library libmysqlclient.so.16 has been removed during MySQL major upgrade.

Resolution

Install the mysql-community-libs-compat package:

1. Connect to the server via SSH.
2. Install the package:

   # yum install mysql-community-libs-compat.x86_64

Additional Information

How to upgrade MySQL 5.5 to 5.6/5.7 or MariaDB 5.5 to 10.0/10.1/10.2 on Linux

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