Docker Swarm和Postgraphile:如何添加DATABASE_URL_FILE环境变量？

Question

我实际上是编程和Docker的新手。我尝试重新构建graphile/postgraphile:4.7.0图像以添加DATABASE_URL_FILE环境变量支持。这就是我所做的和输出。

Dockerfile

FROM node:alpine
LABEL description="Instant high-performance GraphQL API for your PostgreSQL database https://github.com/graphile/postgraphile"

# Install PostGraphile and PostGraphile connection filter plugin
RUN npm install -g postgraphile
RUN npm install -g postgraphile-plugin-connection-filter

EXPOSE 5000

# patch postgraphile:4.7.1; DATABASE_URL_FILE environment variable implementation.
RUN apk add bash
COPY docker-entrypoint.sh /usr/local/bin/
RUN ln -s /usr/local/bin/docker-entrypoint.sh / # backwards compat
ENTRYPOINT ["docker-entrypoint.sh"]
CMD ["postgraphile", "-n", "0.0.0.0"]

docker-entrypoint.sh copied from postgres docker-entrypoint.sh

#!/usr/bin/env bash

# usage: file_env VAR [DEFAULT]
#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
#  "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
file_env() {
    local var="$1"
    local fileVar="${var}_FILE"
    local def="${2:-}"
    if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
        echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
        exit 1
    fi
    local val="$def"
    if [ "${!var:-}" ]; then
        val="${!var}"
    elif [ "${!fileVar:-}" ]; then
        val="$(< "${!fileVar}")"
    fi
    export "$var"="$val"
    unset "$fileVar"
}

# Loads various settings that are used elsewhere in the script
# This should be called before any other functions
docker_setup_env() {
    file_env 'DATABASE_URL'
}

输出

$ docker-compose up postgraphile
Attaching to test_postgraphile_1
test_postgraphile_1  | exited with code 0

诚心诚意，孩子

Answer 1

编辑:本杰明(Postgraphile )在这个问题上帮了我很多。这应该可以按原样工作。

Dockerfile

FROM node:alpine
LABEL description="Instant high-performance GraphQL API for your PostgreSQL database https://github.com/graphile/postgraphile"

# Install PostGraphile and PostGraphile connection filter plugin
RUN npm install -g postgraphile
RUN npm install -g postgraphile-plugin-connection-filter

EXPOSE 5000

# patch postgraphile:4.7.1; DATABASE_URL_FILE environment variable implementation.
RUN apk add bash
COPY docker-entrypoint.sh /usr/local/bin/
RUN ln -s /usr/local/bin/docker-entrypoint.sh / # backwards compat
ENTRYPOINT ["docker-entrypoint.sh"]
CMD ["postgraphile", "-n", "0.0.0.0"]

docker-entrypoint.sh copied from postgres docker-entrypoint.sh

#!/usr/bin/env bash

# usage: file_env VAR [DEFAULT]
#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
#  "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
file_env() {
    local var="$1"
    local fileVar="${var}_FILE"
    local def="${2:-}"
    if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
        echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
        exit 1
    fi
    local val="$def"
    if [ "${!var:-}" ]; then
        val="${!var}"
    elif [ "${!fileVar:-}" ]; then
        val="$(< "${!fileVar}")"
    fi
    export "$var"="$val"
    unset "$fileVar"
}

# Loads various settings that are used elsewhere in the script
# This should be called before any other functions
docker_setup_env() {
    file_env 'DATABASE_URL'
}

# call the function
docker_setup_env

# call postgraphile
exec "$@"

诚心诚意，孩子