example secrets from file

.password

test

docker-compose.yaml

version: "3.7"
services:
  influx:
    build: .
    container_name: "influxdb"
    image: influxdb:secrets
    restart: unless-stopped
    environment:
      INFLUXDB_ADMIN_PASSWORD_FILE: /run/secrets/test
    secrets:
      - test
    ports:
      - '8086:8086'
      - '2003:2003'
    volumes:
      - ./influxdb.conf:/etc/influxdb/influxdb.conf:ro
      - influx-storage:/var/lib/influxdb
volumes:
  influx-storage:
    name: influxdb_storage
    driver: local-persist
    driver_opts:
      mountpoint: ${LOCAL_PERSIST}/influxdb/storage
secrets:
  test:
    file: ./.password

Dockerfile

FROM influxdb:latest
COPY pre-entrypoint.sh /usr/local/bin/
ENTRYPOINT ["pre-entrypoint.sh"]
CMD ["influxd"]

pre-entry.sh

#!/bin/bash

set -e

error() {
  printf '%s [%s] [Entrypoint]: %s\n' "$(date --rfc-3339=seconds)" "ERROR" "$*"
}

file_env() {
	local var="$1"
	local fileVar="${var}_FILE"
	local def="${2:-}"
	if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
		error "Both $var and $fileVar are set (but are exclusive)"
	fi
	local val="$def"
	if [ "${!var:-}" ]; then
		val="${!var}"
	elif [ "${!fileVar:-}" ]; then
		val="$(< "${!fileVar}")"
	fi
	export "$var"="$val"
  printf "$var : $val"
	unset "$fileVar"
}

file_env 'INFLUXDB_ADMIN_PASSWORD'
file_env 'INFLUXDB_USER_PASSWORD'
file_env 'INFLUXDB_READ_USER_PASSWORD'
file_env 'INFLUXDB_WRITE_USER_PASSWORD'

. /entrypoint.sh