How to increase max_connection in official postgreSQL 10.0 docker image
run this docker-compose.yml
version: '2'services: postgres: image: postgres:10.3-alpine command: postgres -c 'max_connections=200' environment: POSTGRES_DB: pgdb POSTGRES_PASSWORD: postgres POSTGRES_USER: postgres stdin_open: true tty: true ports: - 5432:5432/tcp
It is as simple as (you just override the default CMD with postgres -N 500):
docker run -d --name db postgres:10 postgres -N 500You can check it using:
docker run -it --rm --link db:db postgres psql -h db -U postgresshow max_connections;max_connections -----------------500(1 row)
You need to develop a init script. Accept max connections value from environment variable and update it during start up from init script. Finally launch postgreSQL service