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1. Provide OCR engine in VM ("OCR appliance")
2. OCR appliance must be set up to allow remote administration using ssh from the DMS appliance's console by public key authentication for a user with administrative rights (<<adminuser>>)
3. DMS appliance needs /<storagepath>/nuxeo/data/ and /<storagepath>/nuxeo/tmp/ NFS-exports
4. OCR appliance must mount these NFS-shares to /var/lib/nuxeo/data/ and /opt/nuxeo/server/tmp/ respectively and make suer these mounts will be auto mounted (kept alive)
5. In DMS appliance, place a script "piocr" in /<storagepath>/nuxeo/scripts/ and make executable (chmod +x). This script contains the commands to drive the OCR process for each file.
6. Create ssh key in DMS appliance using "ssh-keygen" command, copy public key (id_rsa.pub) and paste into <<adminuserhome>>/.ssh/authorized_keys file of OCR appliance
7. Login from DSM appliance to OCR appliance using ssh. After successful login, move the DMS appliance's key files "id_rsa", "id_rsa.pub" and "known_hosts" from ~/.ssh/ to /<storagepath>/nuxeo/ssh/ 
8. Set key "ocr.engine.name" in PAT_DMS_SETTINGS table of Patricia db to "piocr"
9. Add below change commands to the "commands.conf" file of auto-deploy client specific repository (also found in ~/deploy/config/)
10. Start re-deploy of DMS using ~/deploy/deploy_script/deploy.sh command as outlined here: Auto-deploy script

Scripts:

Make sure you replace <<adminuser>> with the correct user name of an administrative user in the OCR appliance, and <<ocr.appliance.name>> with the proper FQND or IP address:

#!/bin/bash
ssh <<adminuser>>@<<ocr.appliance.name>> "nice -n 10 /path/to/ocr-command <<parameters>> $1 $2""

  add_volume "/<storage_path>/nuxeo/ssh" "/home/nuxeo/.ssh"
  add_volume "/<storage_path>/nuxeo/scripts/piocr" "/usr/local/bin/piocr"