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Given its advantages, the below instructions describe the setup of a OCR engine in a separate VM.

Components and setup required:

1. DMS appliance needs /<storagepath>/nuxeo/data/ and /<storagepath>/nuxeo/tmp/ NFS-exports
2. Provide OCR engine in VM VM ("OCR appliance")
   1. Docker must be installed on VM
   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>>)
   DMS appliance needs /<storagepath>/nuxeo/data/ and /<storagepath>/nuxeo/tmp/ NFS-exports
   2. OCR appliance must mount
   these
   1. DMS NFS-shares to /var/lib/nuxeo/data/ and /opt/nuxeo/server/tmp/ respectively and make
   suer
   1. sure these mounts will be auto mounted (kept alive)
3. In DMS appliance, place a script "tesseract" in /<storagepath>/nuxeo/scripts/ and make executable (chmod +x). This script contains the commands to drive the OCR process for each file.
4. 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
5. 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/ 
6. Set key "ocr.engine.name" in PAT_DMS_SETTINGS table of Patricia db to "tesseract"
7. Add below change commands to the "commands.conf" file of auto-deploy client specific repository (also found in ~/deploy/config/)
8. 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 correct user name of an administrative user in OCR appliance, and <<ocr.appliance.name>> with proper FQND or IP address:

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#!/bin/bash
echo "variables $1 $2"
ssh pidemo@192root@192.168.72.1140 "nice -n 10 /usr/bin/tesseractdocker run -v /var/lib/nuxeo/data/:/var/lib/nuxeo/data -v /opt/nuxeo/server/tmp/:/opt/nuxeo/server/tmp/ --rm jitesoft/tesseract-ocr $1 $2"

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