# Rollback Procedures

Operational recovery procedures for common infrastructure scenarios.

## Quick Reference

| Scenario | Command/Method | Location |
|----------|---------------|----------|
| App rollback | `rollback.sh <app> [sha]` | `web:/opt/deploy/scripts/` |
| Backup restore | `restic restore` + `backup-verify` | Services host |
| Container restart | `docker compose restart` | `/opt/<service>/` |
| Full host rebuild | `./setup --no-terraform` | Local workstation |

---

## 1. Application Deployment Rollback

### Automated Rollback (Last 5 Versions Kept)

On the **web** host, the `app_deployer` role maintains the last 5 versions:

```bash
# List available versions
ssh deploy@web /opt/deploy/scripts/rollback.sh my-api

# Rollback to previous version
ssh deploy@web /opt/deploy/scripts/rollback.sh my-api

# Rollback to specific version
ssh deploy@web /opt/deploy/scripts/rollback.sh my-api <older-sha>
```

### Manual Recovery

```bash
# Check service status
ssh web sudo systemctl status my-api

# View deployment logs
ssh web sudo cat /var/log/deploy.log

# Restart service manually
ssh web sudo systemctl restart my-api
```

---

## 2. Backup Restoration

### Prerequisites

Ensure you have:
- `RESTIC_REPOSITORY` — backup destination (e.g., `s3:https://...`)
- `RESTIC_PASSWORD` — encryption password
- `RESTIC_AWS_ACCESS_KEY_ID` / `RESTIC_AWS_SECRET_ACCESS_KEY` — S3 credentials

### List Available Snapshots

```bash
ssh services sudo restic snapshots
```

### Restore Procedure

```bash
# Stop the service being restored
ssh services sudo systemctl stop forgejo  # or other service

# Create backup of current state (optional safety)
ssh services sudo mv /opt/forgejo /opt/forgejo.pre-restore.$(date +%Y%m%d)

# Restore from specific snapshot
ssh services sudo restic restore <snapshot-id> --target /

# Verify restore (run built-in verification)
ssh services sudo /usr/local/sbin/backup-verify

# Restart service
ssh services sudo docker compose -f /opt/forgejo/docker-compose.yml up -d
```

### Full System Restore

For catastrophic failure, rebuild from backups:

1. **Reprovision host** (if needed): `./setup`
2. **Run Ansible** to restore configs: `./setup --ansible-only`
3. **Restore data** via restic for each service
4. **Verify**: Run `ansible-playbook playbooks/tests/test_config.yml`

---

## 3. Container Stack Recovery

### Individual Service Restart

```bash
# On services host
ssh services

# Navigate to service directory
cd /opt/<service>/

# Check status
sudo docker compose ps

# View logs
sudo docker compose logs -f

# Restart service
sudo docker compose restart

# Full recreate (preserves volumes)
sudo docker compose down && sudo docker compose up -d
```

### Traefik Certificate Issues

```bash
# Trigger certificate re-request
ssh services sudo docker compose -f /opt/traefik/docker-compose.yml restart

# Check certificate status
ssh services sudo docker compose -f /opt/traefik/docker-compose.yml logs -f

# Force ACME re-validation (if needed)
# Note: acme.json is in /opt/traefik/letsencrypt/
```

### Database Recovery (Postgres/Redis)

If using `app_core` role for shared databases:

```bash
# Restore from backup
ssh web sudo restic restore <snapshot-id> --target / --include /var/lib/docker/volumes/app_core*

# Or recreate from app initialization (if data is disposable)
ssh web sudo docker compose -f /opt/app_core/docker-compose.yml down -v
ssh web sudo docker compose -f /opt/app_core/docker-compose.yml up -d
```

---

## 4. DNS and TLS Recovery

### Certificate Expiry / Renewal Issues

```bash
# Check certificate expiration
ssh services "echo | openssl s_client -connect 127.0.0.1:443 2>/dev/null | openssl x509 -noout -dates"

# Force Traefik renewal (restart triggers check)
ssh services sudo docker compose -f /opt/traefik/docker-compose.yml restart
```

### DNS Record Recovery

If DNS records are missing or incorrect:

```bash
# View Terraform plan (safe, read-only)
./setup -- terraform plan

# Apply DNS changes only
./setup -- terraform apply -target=cloudflare_record
```

---

## 5. Full Host Rebuild

### Scenario: Complete server loss

1. **Verify Terraform state** (Linode instance exists):
   ```bash
   ./setup -- terraform show
   ```

2. **Reprovision if needed**:
   ```bash
   # If instance is damaged, destroy and recreate
   ./setup -- terraform taint linode_instance.services  # or .web
   ./setup
   ```

3. **Ansible-only run** (if instance exists):
   ```bash
   ./setup --ansible-only
   ```

4. **Restore data from backups**:
   ```bash
   # On rebuilt host
   ssh services sudo /usr/local/sbin/backup-verify
   ssh services sudo restic restore latest --target / --include /opt/forgejo
   ```

---

## 6. Authelia/SSO Recovery

### Locked Out of Authelia

If you cannot access Authelia (auth.jfraeys.com):

1. **SSH to services host** (direct access, bypasses Authelia)
2. **Edit Authelia config** (if misconfiguration):
   ```bash
   ssh services sudo nano /opt/authelia/configuration.yml
   ssh services sudo docker compose -f /opt/authelia/docker-compose.yml restart
   ```

3. **Emergency bypass** (temporary disable): Edit traefik router to remove middleware

### LLDAP Password Reset

```bash
# Access LLDAP directly (not through Authelia)
# Edit user password via LLDAP admin interface or CLI
ssh services sudo docker compose -f /opt/lldap/docker-compose.yml exec lldap /app/lldap_set_password
```

---

## 7. Forgejo Recovery

### Repository Corruption

```bash
# Run gitea doctor (maintenance tool)
ssh services sudo docker compose -f /opt/forgejo/docker-compose.yml exec forgejo gitea doctor

# Restore from backup
ssh services sudo restic restore <snapshot-id> --target / --include /opt/forgejo
ssh services sudo docker compose -f /opt/forgejo/docker-compose.yml restart
```

### Runner Re-registration

```bash
# On web host - force re-register
ansible-playbook playbooks/web.yml \
  --limit web \
  --tags forgejo_runner \
  -e forgejo_runner_force_reregister=true
```

---

## 8. Testing After Recovery

Always run smoke tests after any recovery:

```bash
# Full test suite
ansible-playbook playbooks/tests/test_config.yml --ask-vault-pass

# Or specific host
ansible-playbook playbooks/tests/test_config.yml --limit services
```

---

## Emergency Contacts / References

- **Backup location**: `{{ RESTIC_REPOSITORY }}` (configured in vault)
- **Alert destination**: `notifications@jfraeys.com`
- **Vault file**: `secrets/vault.yml` (required for all recovery operations)