The self-hosted productivity platform that keeps you in control.
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.
- 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.
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-cachefor 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 Latest dependencies will hence be used instead of outdated ones due to a cached layer.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
syslogor/nginx/logs/error.loginside the container, and open an issue. You can also disable the security module altogether by changing thePHP_HARDENINGenvironment variable tofalsebefore 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
cosignas 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.
latest: latest Nextcloud versionx: 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.
| 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.
| 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.
| 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.
| 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.
| 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
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:
/configvolume is now/nextcloud/config/apps2volume is now/nextcloud/apps2ghcr.io/wonderfall/nextcloudis the new image location
You should edit your docker-compose.yml and config.php accordingly.
To do.