NextCloud Problem Solutions

Nextcloud: Install Preview Generator

This installation guide is tested with Nextcloud up to version 16.x and Preview Generator App up to version 2.x.

Tested and working file formats

avi, doc, bmp, gif, jpg, md, mkv, mp3, mp4, odp, ods, odt, pdf, png, psd, svg, tif, ttf, txt, xls.

Update your system

apt upgrade && apt -y update

Install the Preview Generator App

of the Nextcloud app store: apps.nextcloud.com/apps/previewgenerator

Install LibreOffice

apt install libreoffice libreoffice-l10n-de libreoffice-help-de

Install ffmpeg, ImageMagick and Ghostscript

apt install ffmpeg imagemagick ghostscript

Add preview providers

Append to /var/www/nextcloud/config/config.php

'preview_libreoffice_path' => '/usr/bin/libreoffice',
'enable_previews' => true,
'enabledPreviewProviders' =>
 array (
    0 => 'OC\\Preview\\TXT',
    1 => 'OC\\Preview\\MarkDown',
    2 => 'OC\\Preview\\OpenDocument',
    3 => 'OC\\Preview\\PDF',
    4 => 'OC\\Preview\\MSOffice2003',
    5 => 'OC\\Preview\\MSOfficeDoc',
    6 => 'OC\\Preview\\Image',
    7 => 'OC\\Preview\\Photoshop',
    8 => 'OC\\Preview\\TIFF',
    9 => 'OC\\Preview\\SVG',
   10 => 'OC\\Preview\\Font',
   11 => 'OC\\Preview\\MP3',
   12 => 'OC\\Preview\\Movie',
   13 => 'OC\\Preview\\MKV',
   14 => 'OC\\Preview\\MP4',
   15 => 'OC\\Preview\\AVI',
 ),

Create .cache folder

on ISPConfig servers in the home directory of virtual host to prevent

unable to create directory '/var/www/clients/client1/web1/.cache/dconf': Operation not permitted. dconf will not work properly

Only necessary for for office documents like .ods and .odt.

Fix PolicyMap for ImageMagick

to prevent ImagickException: not authorized error. Necessarry for PDF files.

First Run

sudo -u www-run php /var/www/nextcloud/occ preview:generate-all -vvv

Add Cronjob

crontab -u www-run -e

*/10 * * * * php /var/www/nextcloud/occ preview:pre-generate -vvv

My Config file:

just for debug

<?php
$CONFIG = array (
  'htaccess.RewriteBase' => '/',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'apps_paths' => 
  array (
    0 => 
    array (
      'path' => '/var/www/html/apps',
      'url' => '/apps',
      'writable' => false,
    ),
    1 => 
    array (
      'path' => '/var/www/html/custom_apps',
      'url' => '/custom_apps',
      'writable' => true,
    ),
  ),
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
    'password' => '',
    'port' => 6379,
  ),
  'upgrade.disable-web' => true,
  'instanceid' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'passwordsalt' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'secret' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'trusted_domains' => 
  array (
    0 => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
    1 => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  ),
  'overwriteprotocol' => 'https',
  'overwritehost' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'trustedproxies' => 
  array (
    0 => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
    1 => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'mysql',
  'version' => '30.0.6.2',
  'overwrite.cli.url' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'dbname' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'dbhost' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'oc_son',
  'dbpassword' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'installed' => true,
  'maintenance_window_start' => 8,
  'mail_from_address' => 'son',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_domain' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'mail_smtphost' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
  'mail_smtpport' => '8025',
  'default_phone_region' => 'VN',
  'maintenance' => false,
  'enable_previews' => true,
  'preview_libreoffice_path' => '/usr/bin/libreoffice',
  'enabledPreviewProviders' => 
    array (
      0 => 'OC\\Preview\\TXT',
      1 => 'OC\\Preview\\MarkDown',
      2 => 'OC\\Preview\\OpenDocument',
      3 => 'OC\\Preview\\PDF',
      4 => 'OC\\Preview\\MSOffice2003',
      5 => 'OC\\Preview\\MSOfficeDoc',
      6 => 'OC\\Preview\\Image',
      7 => 'OC\\Preview\\Photoshop',
      8 => 'OC\\Preview\\TIFF',
      9 => 'OC\\Preview\\SVG',
    10 => 'OC\\Preview\\Font',
    11 => 'OC\\Preview\\MP3',
    12 => 'OC\\Preview\\Movie',
    13 => 'OC\\Preview\\MKV',
    14 => 'OC\\Preview\\MP4',
    15 => 'OC\\Preview\\AVI',
    ),
);

Tips #1:

when using docker you need to login as root or www-data in order to fix the issues with nextcloud:

www-data

root

Docker Compose config stack for portainer:

services:
  nextcloud:
    image: nextcloud:stable
    container_name: nextcloud-stable
    restart: always
    environment:
      MYSQL_PASSWORD: XXXXXXXXXXXXXXXXXXXXXXXXXX
      MYSQL_DATABASE: BBBBBBBBBBBBBBBBBBBBBBBBBB
      MYSQL_USER: AAAAAAAAAAAAAAAAAAAAAAAAAAAA
      MYSQL_HOST: CCCCCCCCCCCCCCCCCCCCCCCCCC
      REDIS_HOST: DDDDDDDDDDDDDDDDDDDDDDDDDD
      PUID: 1000
      PGID: 1000
      TZ: Asia/Ho_Chi_Minh

      
    ports:
      - 8180:80
      - 8443:443
    volumes:
      - /mnt/portainer/nextcloud/html:/var/www/html
      - /mnt/portainer/nextcloud/config://var/www/html/config
      - /mnt/portainer/nextcloud/custom_apps://var/www/html/custom_apps
      - /mnt/portainer/nextcloud/data:/var/www/html/data
      - /mnt/portainer/nextcloud/logs:/var/log/apache2
    networks:
      - nginxproxymanager_default
      
networks:
  nginxproxymanager_default:
    external: true

i mounted to my nfs volume which link to my synology data storage through nfs