# Advanced Configuration

## Table of Contents

- [Architecture Overview](#architecture-overview)
  - [Container Profiles](#container-profiles)
  - [Service Inventory & Ports](#service-inventory--ports)
- [Database Hardening](#database-hardening)
- [Compose Overrides](#compose-overrides)
- [Storage Structure](#storage-structure)
- [Build System](#build-system)
- [Custom Configuration](#custom-configuration)

---

This document provides technical details for advanced users and system administrators working with AzerothCore RealmMaster. It covers the internal architecture, configuration options, and customization capabilities for specialized deployments and development environments.

## Architecture Overview

### Container Profiles

```mermaid
flowchart TB
    subgraph init["🔧 Initialization"]
        direction LR
        volinit["ac-volume-init<br/>Docker Volume Permissions"]
        storinit["ac-storage-init<br/>Storage Directory Permissions"]
    end

    subgraph database["💾 Database Layer"]
        direction LR
        mysql["ac-mysql<br/>MySQL 8.0<br/>:64306"]
        dbinit["ac-db-init<br/>Database Creation"]
        dbimport["ac-db-import<br/>Schema Import"]
        backup["ac-backup<br/>Automated Backups"]
    end

    subgraph clientdata["📦 Client Data"]
        client["ac-client-data<br/>WoW Assets (~15GB)"]
    end

    subgraph modmgmt["⚙️ Module Management"]
        direction LR
        modmgr["ac-modules<br/>Downloader & SQL"]
        postinst["ac-post-install<br/>Configuration"]
    end

    subgraph services["🎮 Game Services"]
        direction TB
        subgraph standard["services-standard"]
            direction LR
            auth1["ac-authserver<br/>:3784"]
            world1["ac-worldserver<br/>:8215, :7778"]
        end
        subgraph playerbots["services-playerbots"]
            direction LR
            auth2["ac-authserver-playerbots<br/>:3784"]
            world2["ac-worldserver-playerbots<br/>:8215, :7778"]
        end
        subgraph mods["services-modules"]
            direction LR
            auth3["ac-authserver-modules<br/>:3784"]
            world3["ac-worldserver-modules<br/>:8215, :7778"]
        end
    end

    subgraph tools["🛠️ Management Tools"]
        direction LR
        pma["ac-phpmyadmin<br/>:8081"]
        keira["ac-keira3<br/>:4201"]
    end

    init -.-> database
    database -.-> modmgmt
    database -.-> clientdata
    modmgmt -.-> services
    clientdata -.-> services
    database -.-> tools

    style init fill:#f5f5f5,stroke:#999,color:#000
    style database fill:#e1ffe1,stroke:#4caf50,color:#000
    style clientdata fill:#f0e1ff,stroke:#9c27b0,color:#000
    style modmgmt fill:#ffe1e1,stroke:#f44336,color:#000
    style services fill:#fff4e1,stroke:#ff9800,color:#000
    style tools fill:#e1f5ff,stroke:#2196f3,color:#000
    style standard fill:#fff9e1,color:#000
    style playerbots fill:#fff9e1,color:#000
    style mods fill:#fff9e1,color:#000
```

**Profile Notes:**
- **Initialization**: Auto-runs, no profile needed
- **Database Layer**: `profile: db`
- **Client Data**: `profile: client-data` or `client-data-bots`
- **Module Management**: `profile: modules`
- **Game Services**: ONE of `services-standard`, `services-playerbots`, or `services-modules`
- **Management Tools**: `profile: tools`

### Service Inventory & Ports

| Service / Container | Role | Ports (host → container) | Profile |
|---------------------|------|--------------------------|---------|
| `ac-mysql` | MySQL 8.0 database | *(optional)* `64306 → 3306` (`COMPOSE_OVERRIDE_MYSQL_EXPOSE_ENABLED=1`) | `db` |
| `ac-db-init` | Database schema initialization | – | `db` |
| `ac-db-import` | Database content import | – | `db` |
| `ac-backup` | Automated backup system | – | `db` |
| `ac-authserver` | Auth server (standard) | `3784 → 3724` | `services-standard` |
| `ac-worldserver` | World server (standard) | `8215 → 8085`, `7778 → 7878` | `services-standard` |
| `ac-authserver-playerbots` | Playerbots auth | `3784 → 3724` | `services-playerbots` |
| `ac-worldserver-playerbots` | Playerbots world | `8215 → 8085`, `7778 → 7878` | `services-playerbots` |
| `ac-authserver-modules` | Custom build auth | `3784 → 3724` | `services-modules` |
| `ac-worldserver-modules` | Custom build world | `8215 → 8085`, `7778 → 7878` | `services-modules` |
| `ac-client-data` | Client data fetcher | – | `client-data` |
| `ac-modules` | Module manager | – | `modules` |
| `ac-post-install` | Post-installation configuration | – | Auto-start |
| `ac-phpmyadmin` | Database admin UI | `8081 → 80` | `tools` |
| `ac-keira3` | Game content editor | `4201 → 8080` | `tools` |

## Database Hardening

- **MySQL port exposure** – By default `COMPOSE_OVERRIDE_MYSQL_EXPOSE_ENABLED=0`, so `ac-mysql` is reachable only from the internal Docker network. Set it to `1` to publish `${MYSQL_EXTERNAL_PORT}` on the host; RealmMaster scripts automatically include `compose-overrides/mysql-expose.yml` so the override Just Works. If you invoke Compose manually, remember to add `-f compose-overrides/mysql-expose.yml`. You can follow the same `COMPOSE_OVERRIDE_<NAME>_ENABLED=1` pattern for any custom override files you drop into `compose-overrides/`.
- **Worldserver debug logging** – Need extra verbosity temporarily? Flip `COMPOSE_OVERRIDE_WORLDSERVER_DEBUG_LOGGING_ENABLED=1` to include `compose-overrides/worldserver-debug-logging.yml`, which bumps `AC_LOG_LEVEL` across all worldserver profiles. Turn it back off once you're done to avoid noisy logs.
- **Binary logging toggle** – `MYSQL_DISABLE_BINLOG=1` appends `--skip-log-bin` via the MySQL wrapper entrypoint to keep disk churn low (and match Playerbot guidance). Flip the flag to `0` to re-enable binlogs for debugging or replication.
- **Drop-in configs** – Any `.cnf` placed in `${STORAGE_PATH}/config/mysql/conf.d` (exposed via `MYSQL_CONFIG_DIR`) is mounted into `/etc/mysql/conf.d`. Use this to add custom tunables or temporarily override the binlog setting without touching the image.
- **Forcing a fresh database import** – MySQL’s persistent files (and the `.restore-*` sentinels) now live inside the Docker volume `mysql-data` at `/var/lib/mysql-persistent`. The import workflow still double-checks the live runtime before trusting those markers, logging `Restoration marker found, but databases are empty - forcing re-import` if the tmpfs is empty. When you intentionally need to rerun the import, delete the sentinel with `docker run --rm -v mysql-data:/var/lib/mysql-persistent alpine sh -c 'rm -f /var/lib/mysql-persistent/.restore-completed'` and then execute `docker compose run --rm ac-db-import` or `./scripts/bash/stage-modules.sh`. Leave the sentinel alone during normal operations so the import job doesn’t wipe existing data on every start.
- **Module-driven SQL migration** – Module code is staged through the `ac-modules` service and `scripts/bash/manage-modules.sh`, while SQL payloads are copied into the running `ac-worldserver` container by `scripts/bash/stage-modules.sh`. Every run clears `/azerothcore/data/sql/updates/{db_world,db_characters,db_auth}` and recopies all enabled module SQL files with deterministic names, letting AzerothCore’s built-in updater decide what to apply. Always trigger module/deploy workflows via these scripts rather than copying repositories manually; this keeps C++ builds, Lua assets, and SQL migrations synchronized with the database state.

### Restore-aware module SQL
When a backup successfully restores, the `ac-db-import` container automatically executes `scripts/bash/restore-and-stage.sh`, which simply drops `storage/modules/.modules-meta/.restore-prestaged`. The next `./scripts/bash/stage-modules.sh --yes` clears any previously staged files and recopies every enabled module SQL file before the worldserver boots. AzerothCore’s auto-updater then scans `/azerothcore/data/sql/updates/*`, applies any scripts that aren’t recorded in the `updates` tables yet, and skips the rest—without ever complaining about missing history files.

## Compose Overrides

All helper scripts automatically include any override file found in `compose-overrides/` when its matching flag `COMPOSE_OVERRIDE_<NAME>_ENABLED` is set to `1` in `.env`. Each override declares its flag at the top with `# override-flag: ...`. This lets you ship opt-in tweaks without editing `docker-compose.yml`.

Current examples:

- `compose-overrides/mysql-expose.yml` (`COMPOSE_OVERRIDE_MYSQL_EXPOSE_ENABLED`) – Publishes MySQL to `${MYSQL_EXTERNAL_PORT}` for external clients.
- `compose-overrides/worldserver-debug-logging.yml` (`COMPOSE_OVERRIDE_WORLDSERVER_DEBUG_LOGGING_ENABLED`) – Raises `AC_LOG_LEVEL` to `3` across all worldserver profiles for troubleshooting.

Add your own override by dropping a new `.yml` file into `compose-overrides/`, documenting the flag name in a comment, and toggling that flag in `.env`.

## Storage Structure

The project uses a dual-storage approach for optimal performance:

**Primary Storage** (`STORAGE_PATH` - default: NFS mount or shared storage)
```
storage/
├── config/               # Server configuration files (.conf)
│   └── mysql/
│       └── conf.d/       # Drop-in MySQL overrides (mapped to /etc/mysql/conf.d)
├── client-data/          # Unpacked WoW client data & DBC overrides
├── logs/                 # Server log files
├── modules/              # Downloaded module source code
├── lua_scripts/          # Eluna Lua scripts (auto-loaded)
├── install-markers/      # Module installation state tracking
└── backups/              # Automated database backups
    ├── daily/        # Daily backups (retained per BACKUP_RETENTION_DAYS)
    └── hourly/       # Hourly backups (retained per BACKUP_RETENTION_HOURS)
```

`storage/client-data` is bind-mounted into every world/auth/client-data container. Drop patched `dbc`, `maps`, `vmaps`, or `mmaps` files directly into that folder (e.g., `storage/client-data/dbc/SkillLine.dbc`) and the containers will read them immediately—perfect for modules like Individual Progression or mod-worgoblin that need to overwrite Blizzard data.

Need to capture more than the default `auth/world/characters` schemas? Set `BACKUP_EXTRA_DATABASES` in `.env` (comma or space separated) and the `ac-backup` scheduler will validate each schema before adding it to the hourly/daily dump rotation. The long-standing auto-detection for `acore_playerbots` still works, and any missing optional schemas are logged and skipped instead of breaking the backup run.

To tweak MySQL settings, place `.cnf` snippets in `storage/config/mysql/conf.d`. Files in this directory map straight to `/etc/mysql/conf.d` inside `ac-mysql`, so you can re-enable binary logs or tune buffers without rebuilding images.

**Local Storage** (`STORAGE_PATH_LOCAL` - default: `./local-storage`)
```
local-storage/
├── client-data-cache/    # Downloaded WoW client data archives
├── source/               # AzerothCore source repository (created during builds)
│   └── azerothcore-playerbots/  # Playerbot fork (when playerbots enabled)
└── images/               # Exported Docker images for remote deployment
```
Local storage now only hosts build artifacts, cached downloads, and helper images; the database files have moved into a dedicated Docker volume.

**Docker Volumes**
- `client-data-cache` – Temporary storage for client data downloads
- `mysql-data` – MySQL persistent data + `.restore-*` sentinels (`/var/lib/mysql-persistent`)

This separation ensures database and build artifacts stay on fast local storage while configuration, modules, and backups can be shared across hosts via NFS.

## Build System
The build system is optimized for development and production deployments with Docker multi-stage builds and caching.

**Build Configuration:**
- Automated dependency resolution and compilation
- Multi-stage Docker builds for optimal image sizes
- Build artifact caching for faster rebuilds
- Support for custom patches and modifications

## Custom Configuration
Advanced customization options for specialized deployments and development environments.

**Configuration Options:**
- Environment-specific overrides in `docker-compose.override.yml`
- Custom module loading and configuration
- Database schema modifications and patches
- Network and security configuration

---

## Related Documentation

For additional information, see the following documents:

- [Getting Started Guide](GETTING_STARTED.md) - Basic setup and deployment
- [Module Documentation](MODULES.md) - Complete module catalog and configurations
- [Script Reference](SCRIPTS.md) - Detailed script documentation and usage
- [Main README](../README.md) - Project overview and quick start guide

---

*This documentation is part of the AzerothCore RealmMaster project. For updates and contributions, visit the main project repository.*