OSM vector tile server setup with postgis and tegola

- Set up docker-compose with PostgreSQL/PostGIS and Tegola services
- Added initialization scripts for database setup and OSM data import
- Configured Tegola with vector tile layers for roads and buildings
- Included README with setup instructions and troubleshooting guide

README.md

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+# Hands-on Coding Workshop - Serving and Displaying Vector Tiles with PostgreSQL, Tegola, and OpenLayers
+
+This project sets up a complete OpenStreetMap (OSM) vector tile server using Tegola and PostgreSQL with PostGIS.
+
+## Services
+
+### PostgreSQL with PostGIS
+- **Image**: `kartoza/postgis:15-3.3`
+- **Database**: `osm`
+- **User/Password**: `postgres/postgres`
+- **Port**: `5432`
+- **Extensions**: PostGIS, PostGIS Topology, hstore
+
+### Tegola Vector Tile Server
+- **Image**: `gospatial/tegola:latest`
+- **Port**: `8080` (mapped to container port 8080)
+- **Configuration**: `tegola_config.toml`
+
+## Setup and Usage
+
+### 1. Start the Services
+```bash
+docker-compose up -d
+```
+
+### 2. Monitor the Setup Process
+The PostgreSQL container will automatically:
+1. Initialize the `osm` database
+2. Install PostGIS and hstore extensions
+3. Install osm2pgsql package
+4. Download OSM data for Bosnia and Herzegovina
+5. Import the data using osm2pgsql
+
+Monitor the progress:
+```bash
+docker-compose logs -f postgres
+```
+
+### 3. Verify the Setup
+Check if all services are healthy:
+```bash
+docker-compose ps
+```
+Wait until all services are in the `healthy` state.
+
+Connect to PostgreSQL to verify data:
+```bash
+docker exec -it workshop-postgres psql -U postgres -h 127.0.0.1 -d osm
+```
+
+Check table counts:
+```sql
+SELECT 'planet_osm_point' as table_name, count(*) as row_count FROM planet_osm_point
+UNION ALL
+SELECT 'planet_osm_line' as table_name, count(*) as row_count FROM planet_osm_line
+UNION ALL
+SELECT 'planet_osm_polygon' as table_name, count(*) as row_count FROM planet_osm_polygon;
+```
+
+### 4. Access Vector Tiles
+Once setup is complete, access vector tiles at:
+- Tegola capabilities: `http://localhost:8080/capabilities`
+- Map tiles: `http://localhost:8080/maps/osm/{z}/{x}/{y}.mvt`
+
+## Data
+
+### OSM Data Source
+- **Region**: Bosnia and Herzegovina
+- **Source**: Geofabrik (https://download.geofabrik.de/europe/bosnia-herzegovina-latest.osm.pbf)
+- **Update**: Manual (re-run import script to update)
+
+### Available Layers
+- **Roads**: `osm.roads` (zoom levels 9-16)
+- **Buildings**: `osm.buildings` (zoom levels 12-18)
+
+## File Structure
+```
+.
+├── docker-compose.yml          # Docker services configuration
+├── tegola_config.toml          # Tegola server configuration
+├── init-scripts/               # PostgreSQL initialization scripts
+│   ├── 01-init-database.sql    # Database and extensions setup
+│   ├── 02-install-osm2pgsql.sh # Install osm2pgsql package
+│   └── 03-download-import-osm.sh # Download and import OSM data
+├── osm-data/                   # OSM data storage directory
+└── README.md                   # This file
+```
+
+## Troubleshooting
+
+### Container Issues
+```bash
+# Check container status
+docker-compose ps
+
+# View logs
+docker-compose logs postgres
+docker-compose logs tegola
+
+# Restart services
+docker-compose restart
+```
+
+### Database Issues
+```bash
+# Connect to database
+docker exec -it workshop-postgres psql -U postgres -h 127.0.0.1 -d osm
+
+# Check extensions
+\dx
+
+# Check tables
+\dt
+```
+
+### Re-import Data
+To re-import OSM data with fresh data:
+```bash
+# Stop services
+docker-compose down
+
+# Remove old data
+docker volume rm list-workshop_postgres_data
+rm -rf osm-data/*.pbf
+
+# Start services (will trigger fresh import)
+docker-compose up -d
+```
+
+## Performance Notes
+
+- Initial setup may take 5-10 minutes depending on internet speed and system performance
+- OSM data file size: ~50-100MB for Bosnia and Herzegovina
+- Database size after import: ~500MB-1GB
+- Memory usage: ~512MB cache for osm2pgsql import
+
+## Map Center
+The default map center is set to Mostar (17.8078, 43.3430) in `tegola_config.toml`. You may want to update this to a location within Bosnia and Herzegovina:
+- Sarajevo: `[18.4131, 43.8563, 12.0]`
+- Banja Luka: `[17.1910, 44.7666, 12.0]`

docker-compose.yml

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+services:
+  # PostgreSQL with PostGIS Service
+  postgres:
+    image: kartoza/postgis:15-3.3
+    container_name: workshop-postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: osm
+      POSTGRES_USER: postgres
+      POSTGRES_PASS: postgres
+      PGDATA: /var/lib/postgresql/data/pgdata
+      DEFAULT_ENCODING: "UTF8"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./init-scripts:/docker-entrypoint-initdb.d
+      - ./osm-data:/osm-data
+    networks:
+      - workshop_net
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres -d osm"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 40s
+
+  # Tegola Vector Tile Server Service
+  tegola:
+    image: gospatial/tegola:latest
+    container_name: workshop-tegola
+    restart: unless-stopped
+    command: ["serve", "--config", "/etc/tegola/config.toml"]
+    volumes:
+      - ./tegola_config.toml:/etc/tegola/config.toml
+    networks:
+      - workshop_net
+    ports:
+      - "8080:8080"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "-q", "http://localhost:8080/capabilities"]
+      interval: 15s
+      timeout: 5s
+      retries: 3
+      start_period: 20s
+
+volumes:
+  postgres_data:
+    driver: local
+
+networks:
+  workshop_net:
+    driver: bridge

init-scripts/01-init-database.sql

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+-- Initialize OSM database with PostGIS and hstore extensions
+-- This script runs automatically when PostgreSQL container starts for the first time
+
+-- Connect to the osm database
+\c osm;
+
+-- Enable PostGIS extension
+CREATE EXTENSION IF NOT EXISTS postgis;
+CREATE EXTENSION IF NOT EXISTS postgis_topology;
+
+-- Enable hstore extension for key-value storage
+CREATE EXTENSION IF NOT EXISTS hstore;
+
+-- Grant necessary permissions
+GRANT ALL PRIVILEGES ON DATABASE osm TO postgres;
+GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO postgres;
+GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public TO postgres;
+
+-- Set up proper ownership
+ALTER DATABASE osm OWNER TO postgres;
+
+-- Display confirmation
+SELECT 'OSM database initialized successfully with PostGIS and hstore extensions' AS status;

init-scripts/02-install-osm2pgsql.sh

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+#!/bin/bash
+# Install osm2pgsql and required tools
+# This script runs during PostgreSQL container initialization
+
+set -e
+
+echo "Installing osm2pgsql and dependencies..."
+
+# Update package list
+apt-get update
+
+# Install required packages
+apt-get install -y \
+    osm2pgsql \
+    wget \
+    curl \
+    unzip \
+    ca-certificates \
+    --no-install-recommends
+
+# Clean up to reduce image size
+apt-get clean
+rm -rf /var/lib/apt/lists/*
+
+echo "osm2pgsql installation completed successfully"
+
+# Verify installation
+osm2pgsql --version

init-scripts/03-download-import-osm.sh

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+#!/bin/bash
+# Download and import OSM data for Bosnia and Herzegovina
+# This script runs during PostgreSQL container initialization
+
+set -e
+
+echo "Starting OSM data download and import process..."
+
+# Configuration
+OSM_URL="https://download.geofabrik.de/europe/bosnia-herzegovina-latest.osm.pbf"
+OSM_FILE="/osm-data/bosnia-herzegovina-latest.osm.pbf"
+DB_NAME="osm"
+DB_USER="postgres"
+DB_HOST="127.0.0.1"
+DB_PORT="5432"
+
+# Wait for PostgreSQL to be ready
+echo "Waiting for PostgreSQL to be ready..."
+until pg_isready -h $DB_HOST -p $DB_PORT -U $DB_USER -d $DB_NAME; do
+    echo "PostgreSQL is not ready yet, waiting..."
+    sleep 5
+done
+
+echo "PostgreSQL is ready, proceeding with OSM data processing..."
+
+# Download OSM data if not already present
+if [ ! -f "$OSM_FILE" ]; then
+    echo "Downloading OSM data from $OSM_URL..."
+    wget -O "$OSM_FILE" "$OSM_URL"
+    echo "Download completed successfully"
+else
+    echo "OSM file already exists, skipping download"
+fi
+
+# Verify file was downloaded successfully
+if [ ! -f "$OSM_FILE" ]; then
+    echo "Error: OSM file not found after download attempt"
+    exit 1
+fi
+
+echo "OSM file size: $(du -h $OSM_FILE | cut -f1)"
+
+# Import data using osm2pgsql
+echo "Starting OSM data import with osm2pgsql..."
+
+# osm2pgsql command with optimized settings for vector tiles
+osm2pgsql \
+    --create \
+    --database $DB_NAME \
+    --username $DB_USER \
+    --host $DB_HOST \
+    --port $DB_PORT \
+    --hstore \
+    --style /usr/share/osm2pgsql/default.style \
+    --multi-geometry \
+    --number-processes 2 \
+    --cache 512 \
+    --flat-nodes /osm-data/nodes.cache \
+    "$OSM_FILE"
+
+echo "OSM data import completed successfully"
+
+# Verify import by checking table counts
+echo "Verifying import - checking table row counts:"
+psql -h $DB_HOST -p $DB_PORT -U $DB_USER -d $DB_NAME -c "
+    SELECT 
+        'planet_osm_point' as table_name, count(*) as row_count 
+    FROM planet_osm_point 
+    UNION ALL 
+    SELECT 
+        'planet_osm_line' as table_name, count(*) as row_count 
+    FROM planet_osm_line 
+    UNION ALL 
+    SELECT 
+        'planet_osm_polygon' as table_name, count(*) as row_count 
+    FROM planet_osm_polygon 
+    UNION ALL 
+    SELECT 
+        'planet_osm_roads' as table_name, count(*) as row_count 
+    FROM planet_osm_roads;
+"
+
+echo "OSM data download and import process completed successfully!"

tegola_config.toml

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+[webserver]
+port = ":8080"
+
+[webserver.headers]
+Access-Control-Allow-Origin = "*"
+Cache-Control = "s-maxage=3600"
+
+[[providers]]
+name = "osm"
+type = "mvt_postgis"
+uri = "postgres://postgres:postgres@postgres:5432/osm?sslmode=disable"
+srid = 3857
+
+  [[providers.layers]]
+  name = "roads"
+  geometry_fieldname = "way"
+  geometry_type = "linestring"
+  id_fieldname = "osm_id"
+  sql = "SELECT osm_id, highway, name, ST_AsMVTGeom(way, !BBOX!) AS way FROM planet_osm_line WHERE highway IS NOT NULL AND ST_IsValid(way) AND way && !BBOX!"
+
+  [[providers.layers]]
+  name = "buildings"
+  geometry_fieldname = "way"
+  geometry_type = "polygon"
+  id_fieldname = "osm_id"
+  sql = "SELECT osm_id, building, name, ST_AsMVTGeom(way, !BBOX!) AS way FROM planet_osm_polygon WHERE building IS NOT NULL AND ST_IsValid(way) AND way && !BBOX!"
+
+[[maps]]
+name = "osm"
+center = [17.8078, 43.3430, 12.0] # Mostar, adjust as needed
+
+  [[maps.layers]]
+  provider_layer = "osm.roads"
+  min_zoom = 9
+  max_zoom = 16
+
+  [[maps.layers]]
+  provider_layer = "osm.buildings"
+  min_zoom = 12
+  max_zoom = 18