# Nextcloud - Self-Hosted Cloud Collaboration

## Overview
Nextcloud is a self-hosted cloud collaboration platform providing file storage, sharing, calendar, contacts, and productivity tools. Deployed as a **native LAPP stack** (Linux, Apache, PostgreSQL, PHP) on **Rosalind** with Memcached caching and Incus storage volume for data.

**Host:** rosalind.incus  
**Role:** Collaboration (PHP, Go, Node.js runtimes)  
**Container Port:** 22083  
**External Access:** https://nextcloud.ouranos.helu.ca/ (via HAProxy on Titania)  
**Installation Method:** Native (tar.bz2 extraction to /var/www/nextcloud)

## Architecture

```
┌──────────┐      ┌────────────┐      ┌───────────┐      ┌───────────┐
│  Client  │─────▶│  HAProxy   │─────▶│  Apache2  │─────▶│PostgreSQL │
│          │      │ (Titania)  │      │ Nextcloud │      │ (Portia)  │
└──────────┘      └────────────┘      │(Rosalind) │      └───────────┘
                                      └───────────┘
                                            │
                                            ├─────────▶ Memcached (Local)
                                            │
                                            └─────────▶ /mnt/nextcloud (Volume)
```

## Deployment

### Playbook

```bash
cd ansible
ansible-playbook nextcloud/deploy.yml
```

### Files

| File | Purpose |
|------|---------|
| `nextcloud/deploy.yml` | Main deployment playbook |
| `nextcloud/nextcloud.conf.j2` | Apache VirtualHost template |

2. **Create Data Directory**: `/mnt/nextcloud` on Incus storage volume
3. **Download Nextcloud**: Latest tarball from official site (if not already present)
4. **Extract to Web Root**: `/var/www/nextcloud` (if new installation)
5. **Set Permissions**: `www-data:www-data` ownership
6. **Configure Apache**: Template vhost with port 22083, enable mods, disable default site
7. **Run Installation**: OCC command-line installer (generates config.php with secrets)
8. **Configure via OCC**: Set trusted domains, Memcached, background job mode
9. **Setup Cron**: Background jobs every 5 minutes as www-data

**⚠️ Important**: The playbook does NOT template over config.php after installation. All configuration changes are made via OCC commands to preserve auto-generated secrets (instanceid, passwordsalt, secret).

## Configuration

### Key Features

- **PostgreSQL Backend**: Database on Portia
- **Memcached Caching**: Local distributed cache with `nc_` prefix
- **Incus Storage Volume**: Dedicated 100GB volume at /mnt/nextcloud
- **Apache Web Server**: mod_php with rewrite/headers modules
- **Cron Background Jobs**: System cron (not Docker/AJAX)
- **Native Installation**: No Docker overhead, matches production pattern

### Storage Configuration

| Path | Purpose | Owner | Mount |
|------|---------|-------|-------|
| `/var/www/nextcloud` | Application files | www-data | Local |
| `/mnt/nextcloud` | User data directory | www-data | Incus volume |
| `/var/log/apache2` | Web server logs | root | Local |

### Apache Modules

Required modules enabled by playbook:
- `rewrite` - URL rewriting
- `headers` - HTTP header manipulation
- `env` - Environment variable passing
- `dir` - Directory index handling
- `mime` - MIME type configuration

### PHP Configuration

Installed PHP extensions:
- `php-gd` - Image manipulation
- `php-pgsql` - PostgreSQL database
- `php-curl` - HTTP client
- `php-mbstring` - Multibyte string handling
- `php-intl` - Internationalization
- `php-gmp` - GNU Multiple Precision
- `php-bcmath` - Binary calculator
- `php-xml` - XML processing
- `php-imagick` - ImageMagick integration
- `php-zip` - ZIP archive handling
- `php-memcached` - Memcached caching

### Memcached Configuration

- **Host**: localhost:11211
- **Prefix**: `nc_` (Nextcloud-specific keys)
- **Local**: `\OC\Memcache\Memcached`
- **Distributed**: `\OC\Memcache\Memcached`

### Cron Jobs

Background jobs configured via system cron:
```cron
*/5 * * * * php /var/www/nextcloud/cron.php
```

Runs as `www-data` user every 5 minutes.

## Access After Deployment

1. **Web Interface**: https://nextcloud.ouranos.helu.ca/
2. **First Login**: Use admin credentials from vault
3. **Initial Setup**: Configure apps and settings via web UI
4. **Client Apps**: Download desktop/mobile clients from Nextcloud website

### Desktop/Mobile Sync

- **Server URL**: https://nextcloud.ouranos.helu.ca
- **Username**: admin (or created user)
- **Password**: From vault
- **Desktop Client**: https://nextcloud.com/install/#install-clients
- **Mobile Apps**: iOS App Store / Google Play Store

### WebDAV Access

- **WebDAV URL**: `https://nextcloud.ouranos.helu.ca/remote.php/dav/files/USERNAME/`
- **Use Cases**: File sync, calendar (CalDAV), contacts (CardDAV)

## Monitoring

### Alloy Configuration
**File:** `ansible/alloy/rosalind/config.alloy.j2`

- **Apache Access Logs**: `/var/log/apache2/access.log` → Loki
- **Apache Error Logs**: `/var/log/apache2/error.log` → Loki
- **System Metrics**: Process exporter tracks Apache/PHP processes
- **Labels**: job=apache_access, job=apache_error

### Health Checks

**HAProxy Health Endpoint**: `/status.php`

**Manual Health Check**:
```bash
curl http://rosalind.incus:22082/status.php
```

Expected response: JSON with status information

## Required Vault Secrets

Add to `ansible/inventory/group_vars/all/vault.yml`:

### 1. Database Password
```yaml
vault_nextcloud_db_password: "PostgresSecurePassword123!"
```
**Requirements:**
- Minimum 12 characters
- Used by PostgreSQL authentication

### 2. Admin Password
```yaml
vault_nextcloud_admin_password: "AdminSecurePassword123!"
```
**Requirements:**
- Minimum 8 characters (Nextcloud requirement)
- Used for admin user login
- **Important**: Store securely, used for web interface access

### 3. Instance Secrets (Auto-Generated)
These are automatically generated during installation by the OCC installer and stored in `/var/www/nextcloud/config/config.php`. The host_vars should leave these empty:
```yaml
nextcloud_instance_id: ""  # Auto-generated, leave empty
nextcloud_password_salt: ""  # Auto-generated, leave empty
nextcloud_secret: ""  # Auto-generated, leave empty
```

**ℹ️ These secrets persist in config.php and do not need to be stored in vault or host_vars.** They are only referenced in these variables for consistency with the original template design.

## Host Variables

**File:** `ansible/inventory/host_vars/rosalind.incus.yml`

```yaml
# Nextcloud Configuration
nextcloud_web_port: 22083
nextcloud_data_dir: /mnt/nextcloud

# Database Configuration
nextcloud_db_type: pgsql
nextcloud_db_host: portia.incus
nextcloud_db_port: 5432
nextcloud_db_name: nextcloud
nextcloud_db_user: nextcloud
nextcloud_db_password: "{{vault_nextcloud_db_password}}"

# Admin Configuration
nextcloud_admin_user: admin
nextcloud_admin_password: "{{vault_nextcloud_admin_password}}"

# Domain Configuration
nextcloud_domain: nextcloud.ouranos.helu.ca

# Instance secrets (generated during install)
nextcloud_instance_id: ""
nextcloud_password_salt: ""
nextcloud_secret: ""
```

## Database Setup

Nextcloud requires a PostgreSQL database on Portia. This is automatically created by the `postgresql/deploy.yml` playbook.

**Database Details:**
- **Name**: nextcloud
- **User**: nextcloud
- **Owner**: nextcloud
- **Extensions**: None required

## Storage Setup

### Incus Storage Volume
**Terraform Resource:** `terraform/storage.tf`
```hcl
resource "incus_storage_volume" "nextcloud_data" {
  name    = "nextcloud-data"
  pool    = "default"
  project = "ouranos"
  config = { size = "100GB" }
}
```

Mounted at `/mnt/nextcloud` on Rosalind container. This volume stores all Nextcloud user data, including uploaded files, app data, and user-specific configurations.

## Integration with Other Services

### HAProxy Routing
**Backend Configuration** (`titania.incus.yml`):
```yaml
- subdomain: "nextcloud"
  backend_host: "rosalind.incus"
  backend_port: 22083
  health_path: "/status.php"
```

### Memcached Integration
- **Host**: localhost:11211
- **Prefix**: `nc_`
- **Shared Instance**: Rosalind hosts Memcached for all services

## Troubleshooting

### Service Status
```bash
ssh rosalind.incus
sudo systemctl status apache2
```

### View Logs
```bash
# Apache access logs
sudo tail -f /var/log/apache2/access.log

# Apache error logs
sudo tail -f /var/log/apache2/error.log

# Nextcloud logs (via web UI)
# Settings → Logging
```

### OCC Command-Line Tool
```bash
# As www-data user
sudo -u www-data php /var/www/nextcloud/occ

# Examples:
sudo -u www-data php /var/www/nextcloud/occ status
sudo -u www-data php /var/www/nextcloud/occ config:list
sudo -u www-data php /var/www/nextcloud/occ maintenance:mode --on
```

### Database Connection
```bash
psql -h portia.incus -U nextcloud -d nextcloud
```

### Check Memcached
```bash
echo "stats" | nc localhost 11211
```

### Verify Storage Volume
```bash
# Reset ownership
sudo chown -R www-data:www-data /var/www/nextcloud
sudo chown -R www-data:www-data /mnt/nextcloud

# Reset permissions
sudo chmod -R 0750 /var/www/nextcloud
```

### Maintenance Mode
```bash
# Enable maintenance mode
sudo -u www-data php /var/www/nextcloud/occ maintenance:mode --on

# Disable maintenance mode
sudo -u www-data php /var/www/nextcloud/occ maintenance:mode --off
```

## Updates and Maintenance

### Updating Nextcloud

**⚠️ Important**: Always backup before updating!

```bash
# 1. Enable maintenance mode
sudo -u www-data php /var/www/nextcloud/occ maintenance:mode --on

# 2. Backup config and database
sudo cp -r /var/www/nextcloud/config /backup/nextcloud-config-$(date +%Y%m%d)
pg_dump -h portia.incus -U nextcloud nextcloud > /backup/nextcloud-db-$(date +%Y%m%d).sql

# 3. Download new version
wget https://download.nextcloud.com/server/releases/latest.tar.bz2

# 4. Extract and replace (preserve config/)
tar -xjf latest.tar.bz2
sudo rsync -av --delete --exclude config/ nextcloud/ /var/www/nextcloud/

# 5. Run upgrade
sudo -u www-data php /var/www/nextcloud/occ upgrade

# 6. Disable maintenance mode
sudo -u www-data php /var/www/nextcloud/occ maintenance:mode --off
```

### Database Maintenance
```bash
# Add missing indices
sudo -u www-data php /var/www/nextcloud/occ db:add-missing-indices

# Convert to bigint
sudo -u www-data php /var/www/nextcloud/occ db:convert-filecache-bigint
```

## Version Information

- **Installation Method**: Tarball extraction (official releases)
- **Current Version**: Check web UI → Settings → Overview
- **Update Channel**: Stable (latest.tar.bz2)
- **PHP Version**: Installed by apt (Ubuntu repository version)

## Docker vs Native Comparison

**Why Native Installation?**

| Aspect | Native (Chosen) | Docker |
|--------|-----------------|--------|
| **Performance** | Better (no container overhead) | Good |
| **Updates** | Manual tarball extraction | Container image pull |
| **Cron Jobs** | System cron (reliable) | Requires sidecar/exec |
| **App Updates** | Direct via web UI | Limited/complex |
| **Customization** | Full PHP/Apache control | Constrained by image |
| **Production Match** | Yes (same pattern) | No |
| **Complexity** | Lower for LAMP stack | Higher for orchestration |

**Recommendation**: Native installation matches production deployment pattern and avoids Docker-specific limitations with Nextcloud's app ecosystem and cron requirements.

## References

- **Official Documentation**: https://docs.nextcloud.com/
- **Admin Manual**: https://docs.nextcloud.com/server/latest/admin_manual/
- **Installation Guide**: https://docs.nextcloud.com/server/latest/admin_manual/installation/
- **OCC Commands**: https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/occ_command.html