TL;DR — Quick Summary

Deploy Nextcloud with Docker for self-hosted storage, calendar, and contacts. Covers reverse proxy, Redis, OnlyOffice, Talk video calls, and storage tuning.

What Is Nextcloud?

Nextcloud is a self-hosted cloud platform that provides file sync and sharing, calendar, contacts, video calls, document editing, and dozens of other collaboration features — all running on your own server. It is the leading open-source alternative to Google Workspace, Microsoft 365, and Dropbox.

Key features:

  • File sync & share — desktop and mobile clients, selective sync, sharing links
  • Calendar & Contacts — CalDAV and CardDAV, syncs with any standard client
  • Talk — video calls, screen sharing, chat (replaces Zoom/Meet)
  • Office documents — OnlyOffice or Collabora for real-time collaborative editing
  • Notes & Tasks — Markdown notes, Kanban boards, task management
  • Mail — integrated email client
  • 500+ apps — from the Nextcloud App Store
  • End-to-end encryption — per-folder E2E encryption
  • Federation — share files across Nextcloud instances

Prerequisites

  • Docker + Docker Compose installed.
  • Domain name with DNS pointing to your server.
  • Reverse proxy (Traefik, Nginx, or Caddy) for HTTPS.
  • 4 GB RAM minimum (8 GB recommended for office editing).
  • SSD storage recommended for the database and OS.

Installation with Docker Compose

services:
  nextcloud:
    image: nextcloud:latest
    container_name: nextcloud
    restart: always
    ports:
      - "8080:80"
    volumes:
      - nextcloud-data:/var/www/html
      - /mnt/storage/nextcloud:/var/www/html/data
    environment:
      - POSTGRES_HOST=nextcloud-db
      - POSTGRES_DB=nextcloud
      - POSTGRES_USER=nextcloud
      - POSTGRES_PASSWORD=your-secure-password
      - REDIS_HOST=nextcloud-redis
      - NEXTCLOUD_TRUSTED_DOMAINS=cloud.yourdomain.com
      - OVERWRITEPROTOCOL=https
    depends_on:
      - nextcloud-db
      - nextcloud-redis

  nextcloud-db:
    image: postgres:16-alpine
    container_name: nextcloud-db
    restart: always
    volumes:
      - nextcloud-db:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=nextcloud
      - POSTGRES_USER=nextcloud
      - POSTGRES_PASSWORD=your-secure-password

  nextcloud-redis:
    image: redis:7-alpine
    container_name: nextcloud-redis
    restart: always
    command: redis-server --requirepass your-redis-password

volumes:
  nextcloud-data:
  nextcloud-db:
docker compose up -d

Essential Post-Install Configuration

After initial setup, add these settings to config/config.php (inside the Nextcloud container or data volume):

'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' => [
    'host' => 'nextcloud-redis',
    'port' => 6379,
    'password' => 'your-redis-password',
],
'default_phone_region' => 'MX',
'maintenance_window_start' => 1,

Background Jobs

Switch from AJAX to Cron for reliable background processing:

# Add to host crontab
*/5 * * * * docker exec -u www-data nextcloud php cron.php

Or use the nextcloud/cron image as a sidecar container.

Must-Install Apps

App Replaces Built-in
Calendar Google Calendar ✅ (CalDAV)
Contacts Google Contacts ✅ (CardDAV)
Talk Zoom / Google Meet ✅
Notes Google Keep ✅ (Markdown)
OnlyOffice Google Docs Install from App Store
Deck Trello Install from App Store
Mail Gmail Install from App Store
Photos Google Photos (basic) ✅
Maps Google Maps (basic) Install from App Store

Reverse Proxy Configuration

Nginx Example

server {
    listen 443 ssl http2;
    server_name cloud.yourdomain.com;

    ssl_certificate /etc/letsencrypt/live/cloud.yourdomain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/cloud.yourdomain.com/privkey.pem;

    client_max_body_size 10G;
    fastcgi_buffers 64 4K;

    location / {
        proxy_pass http://localhost:8080;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto https;
    }

    location /.well-known/carddav {
        return 301 $scheme://$host/remote.php/dav;
    }

    location /.well-known/caldav {
        return 301 $scheme://$host/remote.php/dav;
    }
}

Important: Set client_max_body_size to match your maximum upload size. Also configure upload_max_filesize and post_max_size in the Nextcloud PHP settings.

Troubleshooting

“Access through untrusted domain”

Add your domain to config.php:

'trusted_domains' => ['cloud.yourdomain.com'],

Slow performance

  1. Enable Redis caching (see config above).
  2. Use PostgreSQL instead of SQLite.
  3. Enable APCu for local caching.
  4. Set PHP memory_limit to at least 512M.

CalDAV/CardDAV not syncing

Ensure the .well-known redirects are configured in your reverse proxy (see Nginx example above).

Nextcloud vs. Alternatives

Feature Nextcloud Google Workspace Syncthing Seafile
File Sync ✅ ✅ ✅ ✅
Calendar/Contacts ✅ ✅ ❌ ❌
Video Calls ✅ (Talk) ✅ (Meet) ❌ ❌
Office Editing ✅ (OnlyOffice) ✅ (Docs) ❌ ✅
Self-Hosted ✅ ❌ ✅ (P2P) ✅
E2E Encryption ✅ ❌ ✅ ✅
Cost Free $6+/user/mo Free Free / paid
App Ecosystem 500+ apps Extensive None Limited

Summary

Nextcloud gives you a complete, self-hosted Google Workspace replacement with file sync, calendar, contacts, video calls, and document editing — all under your control. Deploy it with Docker Compose, configure Redis caching and a reverse proxy, and you have a private cloud for your team or family.