frappe_docker/docs/09-concepts/02-docker-bind-mounts.md
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---
title: Docker Bind Mounts
---
# Docker Bind Mounts
## What Are Bind Mounts?
Bind mounts create a direct connection between a directory on your host machine and a directory inside a container. Changes in either location are immediately reflected in the other - perfect for development where you want to edit code on your host and see changes in the container.
## Bind Mount vs Named Volume vs Anonymous Volume
| Type | Syntax | Use Case | Persistence |
| -------------------- | ------------------------------ | -------------------------- | ---------------------------- |
| **Bind Mount** | `./local/path:/container/path` | Development, config files | On host filesystem |
| **Named Volume** | `volume_name:/container/path` | Production data, databases | Docker-managed |
| **Anonymous Volume** | `/container/path` | Temporary/cache data | Docker-managed, auto-deleted |
## Bind Mount Examples
```yaml
services:
backend:
volumes:
# Development: Edit code on host, run in container
- ./my_custom_app:/home/frappe/frappe-bench/apps/my_custom_app
# Configuration: Override container config with host file
- ./custom-config.json:/home/frappe/frappe-bench/sites/common_site_config.json:ro # :ro = read-only
# Logs: Access container logs on host for debugging
- ./logs:/home/frappe/frappe-bench/logs
# Database (not recommended for production)
- ./data/mysql:/var/lib/mysql
# Named volume for production database
db:
volumes:
- db_data:/var/lib/mysql # Managed by Docker, survives container deletion
volumes:
db_data: # Define named volume
```
## Performance Optimization (macOS/Windows)
Docker on macOS/Windows uses a VM, making bind mounts slower. Use these flags:
```yaml
volumes:
# :cached - Host writes are buffered (good for general development)
- ./development:/home/frappe/frappe-bench:cached
# :delegated - Container writes are buffered (best when container writes heavily)
- ./development:/home/frappe/frappe-bench:delegated
# :consistent - Full synchronization (slowest but safest)
- ./development:/home/frappe/frappe-bench:consistent
```
**Recommendation:** Use `:cached` for most development work on macOS/Windows.