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Resolved Restore stops with "... deployer application missing ... or unexpectedly terminated"

Bitpalast

Plesk addicted!
Plesk Guru
Plesk Onyx 17.5, CentOS 7.3, 64-Bit

On a full restore of admin owned users and admin owned domains from a locally stored backup, after the restore routines have restored approximately 15 users and their subscriptions, all the sudden the restore stops with

"Error:
Perhaps /usr/local/psa/admin/bin/deployer application missing, has incorrect permissions or unexpectedly terminated"

The knowledgebase articles and other user reports on this did not fit the case. No obvious errors in the log files. Machine is a 12-core system without any other load and has 256 GB RAM + 128 MB swap space. No other transactions like web server restarts or reconfigurations were going on at the same time. No other pmm-processes were in the process list. The deployer library is installed on the system. Single subscription restores were possible.

The error was reproducible on several attempts to restore "full system".

The final solution was to reboot the computer. After the reboot, users and subscriptions could be restored with only some minor, typical issues. The reboot must have cleared something from the processes or RAM that was previously breaking the deployment process of the restore. The exact reason remains unclear.
 
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