osm2pgsql-docker-quickstart

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osm2pgsql-docker-quickstart

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A simple docker-compose setup of osm2pgsql and postgis

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# osm2pgsql Docker Quickstart

This is a simple docker-compose.yml setup using [osm2pgsql](https://github.com/openstreetmap/osm2pgsql) with [postgis](http://postgis.net/). It is not well tuned, please read the [osm2pgsql manual](https://osm2pgsql.org/doc/manual.html) for more information on how to best use osm2pgsql.

# Credit

This project started with a fork from [OsmHackTW/osm2pgsql-docker](https://github.com/OsmHackTW/osm2pgsql-docker).

At SOTM2022 I learned osm2pgsql is already packaged... so now this container
uses `debian:trixie-backports` and `apt-get install -y osm2pgsql/trixie-backports`!

# Usage

Running the following:

```
docker-compose up
```

This will build the osm2pgsql container, download the postgis/postgis image, and run them both. Within the osm2pgsql container is a script to pulldown an OpenStreetMap area from [geofabrik](https://download.geofabrik.de/). The region can be changed in the docker-compose file under `REGION`.

Support for multiple regions is not fully implemented, and requires downloading the regions seperately.

## Extract

If you think you may have to setup your database more than once, consider downloading an
extract (from geofabrik or elsewhere), you can specify the pbf directory in under `volumes` in the `docker-compose.yml`. (`delaware` is a great state to test with!)

After the file is loaded into the postgis database, you can connect to it locally with the connection information found in docker-compose.yml

## Updating

You can update the database by re-running the osm2pgsql docker container, it will use
`osm2pgsql-replication` to update the existing database.

When using multiple regions the `REPLICATION_SERVER` will be set to `https://planet.openstreetmap.org/replication/day/`.

## Post-Import Hook

The importer supports an optional post-processing hook that runs after successful import or update cycles. This is useful for creating statistics views, refreshing materialized views, or running custom SQL.

### Environment Variables

| Variable | Required | Default | Description |
|----------|----------|---------|-------------|
| `POST_IMPORT_SQL` | No | _(empty)_ | Path to SQL file executed after successful import/update |
| `POST_IMPORT_SCRIPT` | No | _(empty)_ | Path to shell script (takes precedence over SQL) |
| `POST_IMPORT_FAIL_HARD` | No | `true` | If `true`, post-import failure fails the entire import |

### Execution Behavior

- **Script precedence**: If `POST_IMPORT_SCRIPT` is set and exists, it runs instead of SQL
- **Skip silently**: If neither variable is set or files don't exist, continues without error
- **Connection reuse**: SQL execution inherits database connection from importer environment
- **Logging**: Output prefixed with `[post-import]` to distinguish from import logs

### Example Configuration

```yaml
services:
  osm2pgsql:
    environment:
      # ... other vars ...
      POST_IMPORT_SQL: /osm2pgsql-configs/post-import.sql
      POST_IMPORT_FAIL_HARD: "true"
    volumes:
      - ./osm2pgsql-configs:/osm2pgsql-configs:ro
```

### Writing Idempotent SQL

Post-import SQL should be idempotent (safe to run on both create and update cycles):

```sql
-- Drop and recreate pattern (recommended for stats views)
DROP MATERIALIZED VIEW IF EXISTS my_stats;
CREATE MATERIALIZED VIEW my_stats AS SELECT ...;
```

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