• BACKEND - Storage enginge for counter, default redis. Values can be redis, inmemory, postgres, or mongodb.
• PORT - port to listen on (default: 8000)
• REDIS - Redis host (default: 127.0.0.1)
• REDIS_PASSWORD - Redis password (default: '' - empty string)
• POSTGRES_HOST - Postgres host (default: 127.0.0.1)
• POSTGRES_USER - Postgres user (default: postgres)
• POSTGRES_PASSWORD - Postgres password (default: pg)
• POSTGRES_DATABASE - Postgres database (default: postgres)
• POSTGRES_SSLMODE - Postgres SSL mode (default: disable, values can be disable, require)
• MONGODB_URI - MongoDB host (default: mongodb://127.0.0.1:27017)
• SLOW_START - Time in seconds to wait before start (default: 0)
• EXTRA_TEXT - Extra text to display (default: '')

• GET / - Get counter value with UI rendering (HTML for browsers, plain text for curl)
• GET /api/counter - Get counter value in JSON format

• GET /api/livez or GET /livez - for liveness probe
• GET /api/readyz or GET /readyz - for readiness probe

• GET /api/version or GET /version - Get application version
• GET /api/status or GET /status - Get application status and runtime information

• GET /metrics - Prometheus metrics endpoint

• ondrejsika/counter
• ghcr.io/ondrejsika/counter

Redis

docker run --name redis -d -p 6379:6379 redis

Get counter value from Redis

docker exec redis redis-cli get counter

MongoDB

docker run --name mongodb -d -p 27017:27017 mongo

Get counter value from MongoDB

docker exec -it mongodb mongosh counter --eval 'db.counter.find()'

Postgres

docker run --name postgres -d -p 5432:5432 -e POSTGRES_PASSWORD=pg postgres

Get counter value from Postgres

docker exec postgres psql -U postgres -c 'SELECT * FROM counters'