[NC20 running with docker-compose] Cron container is not working

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Nextcloud version (eg, 18.0.2): 20.0.1 (docker-compose)
Operating system and version (eg, Ubuntu 20.04): Debian GNU/Linux 10 (buster)
Apache or nginx version (eg, Apache 2.4.25): nginx/1.14.2
PHP version (eg, 7.1): 7.4.12

The issue you are facing:
I tried to change the background tasks setting to use Cron. For this, I created another docker container in which the

Here is a snippet of my docker-compose.yml:

  nextcloud:
    image: nextcloud
    container_name: nextcloud
    networks:
      - nextcloud
    ports:
      - "127.0.0.1:8080:80"
    volumes:
      - ${NEXTCLOUD_ROOT}/html:/var/www/html
      - ${NEXTCLOUD_ROOT}/data:/opt/nextcloud/data
    extra_hosts:
      - "${NEXTCLOUD_FQDN}:${NEXTCLOUD_IPADDRESS}"
      - "${COLLABORA_FQDN}:${NEXTCLOUD_IPADDRESS}"
    depends_on:
      - mariadb
      - redis
    environment:
      - NEXTCLOUD_TRUSTED_DOMAINS='${NEXTCLOUD_FQDN}'
      - NEXTCLOUD_DATA_DIR=/opt/nextcloud/data
      - MYSQL_DATABASE=${MYSQL_DATABASE}
      - MYSQL_USER=${MYSQL_USER}
      - MYSQL_PASSWORD=${MYSQL_PASSWORD}
      - MYSQL_HOST=${MYSQL_HOST}
      - REDIS_HOST=${REDIS_HOST}
      - REDIS_HOST_PASSWORD=${REDIS_PASSWORD}
    restart: unless-stopped

  cron:
    image: nextcloud
    restart: always
    volumes:
      - ${NEXTCLOUD_ROOT}/html:/var/www/html
      - ${NEXTCLOUD_ROOT}/data:/opt/nextcloud/data
    entrypoint: /cron.sh
    depends_on:
      - mariadb
      - redis
    networks:
      - nextcloud

Log output for this cron container:

cron_1       | 2020-11-09T19:00:00.756923492Z crond: crond (busybox 1.30.1) started, log level 0
cron_1       | 2020-11-09T19:00:00.756948589Z crond: user:www-data entry:(null)
cron_1       | 2020-11-09T19:00:00.756950963Z 100001000010000100001000010000100001000010000100001000010000
cron_1       | 2020-11-09T19:00:00.756952927Z 111111111111111111111111
cron_1       | 2020-11-09T19:00:00.756954630Z 11111111111111111111111111111111
cron_1       | 2020-11-09T19:00:00.756957756Z 111111111111
cron_1       | 2020-11-09T19:00:00.756959369Z 1111111
cron_1       | 2020-11-09T19:01:00.757199354Z crond: user:www-data entry:(null)
cron_1       | 2020-11-09T19:01:00.757228800Z 100001000010000100001000010000100001000010000100001000010000
cron_1       | 2020-11-09T19:01:00.757231234Z 111111111111111111111111
cron_1       | 2020-11-09T19:01:00.757233088Z 11111111111111111111111111111111
cron_1       | 2020-11-09T19:01:00.757234891Z 111111111111
cron_1       | 2020-11-09T19:01:00.757237045Z 1111111
cron_1       | 2020-11-09T19:01:00.757238799Z crond: wakeup dt=60
cron_1       | 2020-11-09T19:01:00.757240562Z crond: file www-data:
cron_1       | 2020-11-09T19:01:00.757242355Z crond:  line php -f /var/www/html/cron.php
cron_1       | 2020-11-09T19:02:00.757306747Z crond: wakeup dt=60
cron_1       | 2020-11-09T19:02:00.757325472Z crond: file www-data:
cron_1       | 2020-11-09T19:02:00.757327796Z crond:  line php -f /var/www/html/cron.php
cron_1       | 2020-11-09T19:03:00.757446224Z crond: wakeup dt=60
cron_1       | 2020-11-09T19:03:00.757473535Z crond: file www-data:
cron_1       | 2020-11-09T19:03:00.757475859Z crond:  line php -f /var/www/html/cron.php
cron_1       | 2020-11-09T19:04:00.757618548Z crond: wakeup dt=60
cron_1       | 2020-11-09T19:04:00.757647873Z crond: file www-data:
cron_1       | 2020-11-09T19:04:00.757650949Z crond:  line php -f /var/www/html/cron.php
cron_1       | 2020-11-09T19:05:00.757767467Z crond: wakeup dt=60
cron_1       | 2020-11-09T19:05:00.757798646Z crond: file www-data:
cron_1       | 2020-11-09T19:05:00.757801531Z crond:  line php -f /var/www/html/cron.php
cron_1       | 2020-11-09T19:05:00.757803715Z crond:  job: 0 php -f /var/www/html/cron.php
cron_1       | 2020-11-09T19:05:00.757903222Z crond: child running /bin/bash
cron_1       | 2020-11-09T19:05:00.757992670Z crond: USER www-data pid   6 cmd php -f /var/www/html/cron.php
cron_1       | 2020-11-09T19:05:00.772297251Z Could not open input file: /var/www/html/cron.php

Do you have any idea what’s going on here?
Executing docker exec -it -u www-data nextcloud php -f /var/www/html/cron.php manually is working fine…

Is this the first time you’ve seen this error? (Y/N): N

The output of your Nextcloud log in Admin > Logging:

nothing related to background tasks / cron

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?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' => 'nextcloud-redis',
    'password' => 'xxx',
    'port' => 6379,
  ),
  'instanceid' => 'xxx',
  'passwordsalt' => 'xxx',
  'secret' => 'xxx',
  'trusted_domains' =>
  array (
    0 => 'xxx',
  ),
  'datadirectory' => '/opt/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '20.0.1.1',
  'overwrite.cli.url' => 'xxx',
  'dbname' => 'nextcloud',
  'dbhost' => 'nextcloud-mariadb',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'xxx',
  'dbpassword' => 'xxx',
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_smtpsecure' => 'tls',
  'mail_sendmailmode' => 'smtp',
  'mail_from_address' => 'xxx',
  'mail_domain' => 'xxx',
  'mail_smtpauth' => 1,
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtphost' => 'xxx',
  'mail_smtpport' => 'xxx',
  'mail_smtpname' => 'xxx',
  'mail_smtppassword' => 'xxx',
  'twofactor_enforced' => 'false',
  'twofactor_enforced_groups' =>
  array (
    0 => 'admin',
  ),
  'twofactor_enforced_excluded_groups' =>
  array (
  ),
  'trusted_proxies' =>
  array (
    1 => '127.0.0.1',
  ),
  'overwriteprotocol' => 'https',
  'overwritehost' => 'xxx',
  'loglevel' => 2,
  'maintenance' => false,
);

The output of your Apache/nginx/system log in /var/log/____:

nothing related to background tasks / cron
2

Well, after stopping + removing the related docker containers and checking directory / file permissions again, it’s now working fine.

Could be closed.

3

Same problem on a Windows WSL2 setup.
What should I do?