Docker-Compose and Postgres Extensions

Question

This is my docker-compose file. Is there any easy way to get a postgres extension installed? I'm trying to install pg_trgm .

Edit: I now have two dockerfiles and an install script. It doesn't seem to be working when I run docker-compose up build

Internal server error: pq: operator does not exist: character varying % unknown

services:
  db:
    build:
      context: .
      dockerfile: db/Dockerfile
    image: postgres
    ports:
      - "5432:5432"
    environment:
      - POSTGRES_USER=x
      - POSTGRES_PASSWORD=x
      - POSTGRES_DB=x

  api:
    build:
      context: .
      args:
        app_env: ${APP_ENV}
    volumes:
      - .:/go/src/x/y/z
    ports:
      - "8080:8080"

db/Dockerfile:

FROM postgres
COPY db/install-extensions.sql /docker-entrypoint-initdb.d

db/install-extensions.sql

CREATE EXTENSION IF NOT EXISTS pg_trgm;

Answer 1

This is my docker-compose file. Is there any easy way to get a postgres extension installed? I'm trying to install pg_trgm .

Edit: I now have two dockerfiles and an install script. It doesn't seem to be working when I run docker-compose up build

Internal server error: pq: operator does not exist: character varying % unknown

services:
  db:
    build:
      context: .
      dockerfile: db/Dockerfile
    image: postgres
    ports:
      - "5432:5432"
    environment:
      - POSTGRES_USER=x
      - POSTGRES_PASSWORD=x
      - POSTGRES_DB=x

  api:
    build:
      context: .
      args:
        app_env: ${APP_ENV}
    volumes:
      - .:/go/src/x/y/z
    ports:
      - "8080:8080"

db/Dockerfile:

FROM postgres
COPY db/install-extensions.sql /docker-entrypoint-initdb.d

db/install-extensions.sql

CREATE EXTENSION IF NOT EXISTS pg_trgm;

Answer 2

I'm not sure precisely why but in order to get this working I had to use a shell script:

#!/usr/bin/env bash

echo "enabling pg_trgm on database $POSTGRES_DB"
psql -U $POSTGRES_USER --dbname="$POSTGRES_DB" <<-'EOSQL'
  create extension if not exists pg_trgm;
EOSQL
echo "finished with exit code $?"

possibly because I was overriding the default database and user name.