wonderfall/nextcloud

The self-hosted productivity platform that keeps you in control.

About

This non-official image is intended as an all-in-one (as in monolithic) Nextcloud production image. If you're not sure you want this image, you should probably use the official image. The main goal is to provide an easy-to-use image with decent security standards.

Check out Nextcloud official website and source code.

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• Features
• Security
• Tags
• Build-time variables
• Environment variables
  • Runtime
  • Startup
• Volumes
• Ports
• Migration
• Usage

Features

• Based on Alpine Linux.
• Fetching PHP/nginx from their official images.
• Rootless: no privilege at any time, even at startup.
• Uses s6 as a lightweight process supervisor.
• Supports MySQL/MariaDB, PostgresQL and SQLite3 database backends.
• Includes OPcache and APCu for improved caching & performance, also supports redis.
• Tarball integrity & authenticity checked during build process.
• Includes hardened_malloc, a hardened memory allocator.
• Includes Snuffleupagus, a PHP security module.
• Includes a simple built-in cron system.
• Much easier to maintain thanks to multi-stages build.
• Does not include imagick, samba, etc. by default.

You're free to make your own image based on this one if you want a specific feature. Uncommon features won't be included as they can increase attack surface: this image intends to stay minimal, but functional enough to cover basic needs.

Security

Don't run random images from random dudes on the Internet. Ideally, you want to maintain and build it yourself.

• Images are scanned every day by Trivy for OS vulnerabilities. Known vulnerabilities will be automatically uploaded to GitHub Security Lab for full transparency. This also warns me if I have to take action to fix a vulnerability.
• Latest tag/version is automatically built weekly, so you should often update your images regardless if you're already using the latest Nextcloud version.
• Build production images without cache (use docker build --no-cache for instance) if you want to build your images manually. Latest dependencies will hence be used instead of outdated ones due to a cached layer.
• A security module for PHP called Snuffleupagus is used by default. This module aims at killing entire bug and security exploit classes (including XXE, weak PRNG, file-upload based code execution), thus raising the cost of attacks. For now we're using a configuration file derived from the default one, with some explicit exceptions related to Nextcloud. This configuration file is tested and shouldn't break basic functionality, but it can cause issues in specific and untested use cases: if that happens to you, get logs from either syslog or /nginx/logs/error.log inside the container, and open an issue. You can also disable the security module altogether by changing the PHP_HARDENING environment variable to false before recreating the container.
• Images are signed with the GitHub-provided OIDC token in Actions using the experimental "keyless" signing feature provided by cosign. You can verify the image signature using cosign as well:

COSIGN_EXPERIMENTAL=true cosign verify ghcr.io/wonderfall/nextcloud

Verifying the signature isn't a requirement, and might not be as seamless as using Docker Content Trust (which is not supported by GitHub's OCI registry). However, it's strongly recommended to do so in a sensitive environment to ensure the authenticity of the images and further limit the risk of supply chain attacks.

Tags

• latest : latest Nextcloud version
• x : latest Nextcloud x.x (e.g. 24)
• x.x.x : Nextcloud x.x.x (e.g. 24.0.0)

You can always have a glance here. Only the latest stable version will be maintained by myself.

Note: automated builds only target linux/amd64 (x86_64). There is no technical reason preventing the image to be built for arm64 (in fact you can build it yourself), but GitHub Actions runners are limited in memory, and this limit makes it currently impossible to target both platforms.

Build-time variables

Variable	Description	Default
NEXTCLOUD_VERSION	version of Nextcloud	*
ALPINE_VERSION	version of Alpine Linux	*
PHP_VERSION	version of PHP	*
NGINX_VERSION	version of nginx	*
HARDENED_MALLOC_VERSION	version of hardened_malloc	*
SNUFFLEUPAGUS_VERSION	version of Snuffleupagus (php ext)	*
SHA256_SUM	checksum of Nextcloud tarball (sha256)	*
GPG_FINGERPRINT	fingerprint of Nextcloud GPG key	*
UID	user id	1000
GID	group id	1000
CONFIG_NATIVE	native code for hardened_malloc	false
VARIANT	variant of hardened_malloc (see repo)	light

* latest known available, likely to change regularly

For convenience they were put at the very top of the Dockerfile and their usage should be quite explicit if you intend to build this image yourself. If you intend to change NEXTCLOUD_VERSION, change SHA256_SUM accordingly.

Environment variables

Runtime

Variable	Description	Default
UPLOAD_MAX_SIZE	file upload maximum size	10G
APC_SHM_SIZE	apc shared memory size	128M
OPCACHE_MEM_SIZE	opcache available memory	128M
MEMORY_LIMIT	max php command mem usage	512M
CRON_PERIOD	cron time interval (min.)	5m
CRON_MEMORY_LIMIT	cron max memory usage	1G
DB_TYPE	sqlite3, mysql, pgsql	sqlite3
DOMAIN	host domain	localhost
PHP_HARDENING	enables snuffleupagus	true

Leave them at default if you're not sure what you're doing.

Startup

Variable	Description
ADMIN_USER	admin username
ADMIN_PASSWORD	admin password
DB_TYPE	sqlite3, mysql, pgsql
DB_NAME	name of the database
DB_USER	name of the database user
DB_PASSWORD	password of the db user
DB_HOST	database host

ADMIN_USER and ADMIN_PASSWORD are optional and mainly for niche purposes. Obviously, avoid clear text passwords. Once setup.sh has run for the first time, these variables can be removed. You should then edit /nextcloud/config/config.php directly if you want to change something in your configuration.

The usage of Docker secrets will be considered in the future, but config.php already covers quite a lot.

Volumes

Variable	Description
/data	data files
/nextcloud/config	config files
/nextcloud/apps2	3rd-party apps
/nextcloud/themes	custom themes
/php/session	PHP session files

Note: mounting /php/session isn't required but could be desirable in some circumstances.

Ports

Port	Use
8888 (tcp)	Nextcloud web

A reverse proxy like Traefik or Caddy can be used, and you should consider:

• Redirecting all HTTP traffic to HTTPS
• Setting the HSTS header correctly

Migration

From now on you'll need to make sure all volumes have proper permissions. The default UID/GID is now 1000, so you'll need to build the image yourself if you want to change that, or you can just change the actual permissions of the volumes using chown -R 1000:1000. The flexibility provided by the legacy image came at some cost (performance & security), therefore this feature won't be provided anymore.

Other changes that should be reflected in your configuration files:

• /config volume is now /nextcloud/config
• /apps2 volume is now /nextcloud/apps2
• ghcr.io/wonderfall/nextcloud is the new image location

You should edit your docker-compose.yml and config.php accordingly.

Usage

To do.