docker - 如何使用Phoenix Guides中的示例在生产模式下运行Elixir Phoenix Docker？

Question

《 Elixir Phoenix指南》中给出的示例Dockerfile似乎已过时且损坏。可以在此处找到示例:https://hexdocs.pm/phoenix/releases.html#containers

我像这样创建了一个 Vanilla 应用程序:mix phx.new hello_world
损坏的Dockerfile:

# FROM elixir:1.9.0-alpine as build

# install build dependencies
RUN apk add --update git build-base nodejs yarn python

# prepare build dir
RUN mkdir /app
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force && \
    mix local.rebar --force

# set build ENV
ENV MIX_ENV=prod

# install mix dependencies
COPY mix.exs mix.lock ./
COPY config config
RUN mix deps.get
RUN mix deps.compile

# build assets
COPY assets assets
RUN cd assets && npm install && npm run deploy
RUN mix phx.digest

# build project
COPY priv priv
COPY lib lib
RUN mix compile

# build release
COPY rel rel
RUN mix release

# prepare release image
FROM alpine:3.9 AS app
RUN apk add --update bash openssl

RUN mkdir /app
WORKDIR /app

COPY --from=build /app/_build/prod/rel/my_app ./
RUN chown -R nobody: /app
USER nobody

ENV HOME=/app

我正在尝试从Vanilla Phoenix应用程序安装中运行Dockerfile，并且遇到了许多问题，包括:

# FROM elixir:1.9.0-alpine as build
# Needs to be uncommented

RUN cd assets && npm install && npm run deploy
# npm install failed, had to add nodejs-npm

COPY rel rel
# errors here, there is no rel, should I remove?

More errors later because DATABASE_URL and SECRET_KEY_BASE are not declared

我不是专家，到目前为止，Dockerfile现在看起来像这样:

FROM elixir:1.9.1-alpine as build

# install build dependencies
# modified: is this correct?
RUN apk add --update git build-base nodejs nodejs-npm yarn python

# prepare build dir
RUN mkdir /app
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force && \
    mix local.rebar --force

# set build ENV
# modified: is this correct?
ENV DATABASE_URL=${DATABASE_URL} \
  SECRET_KEY_BASE=${SECRET_KEY_BASE} \
  MIX_ENV=prod

# install mix dependencies
COPY mix.exs mix.lock ./
COPY config config
RUN mix deps.get
RUN mix deps.compile

# build assets
COPY assets assets
RUN cd assets && npm install && npm run deploy

# build project
COPY priv priv
COPY lib lib
RUN mix compile

# build release
# removed next line, is that correct?
# COPY rel rel
RUN mix release

# prepare release image
FROM alpine:3.9 AS app
RUN apk add --update bash openssl

RUN mkdir /app
WORKDIR /app

COPY --from=build /app/_build/prod/rel/hello_world ./
RUN chown -R nobody: /app
USER nobody

ENV HOME=/app

ENTRYPOINT ["./bin/hello_world", "start"]

我尝试使用以下命令运行容器:

docker run -it -e DATABASE_URL='ecto://postgres:123456@localhost/hello_world_dev' -e SECRET_KEY_BASE='blargblargblarg' hello_world:latest

但是我得到这个错误:

05:20:34.841 [error] GenServer #PID<0.1380.0> terminating
** (RuntimeError) connect raised KeyError exception: key :database not found. The exception details are hidden, as they may contain sensitive data such as database credentials. You may set :show_sensitive_data_on_connection_error to true when starting your connection if you wish to see all of the details
    (elixir) lib/keyword.ex:393: Keyword.fetch!/2
    (postgrex) lib/postgrex/protocol.ex:92: Postgrex.Protocol.connect/1
    (db_connection) lib/db_connection/connection.ex:69: DBConnection.Connection.connect/2
    (connection) lib/connection.ex:622: Connection.enter_connect/5
    (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3
Last message: nil

..... repeat a lot

05:48:41.296 [info] Application hello_world exited: shutdown

这对我来说是全新的。我已经轻松地部署到了Heroku，但是想要使用Docker部署到AWS，GCP等的快乐之路...

更新1:
这是config/prod.secret.exs文件。我还没有修改。请注意，它正在加载环境变量:

# In this file, we load production configuration and secrets
# from environment variables. You can also hardcode secrets,
# although such is generally not recommended and you have to
# remember to add this file to your .gitignore.
use Mix.Config

database_url =
  System.get_env("DATABASE_URL") ||
    raise """
    environment variable DATABASE_URL is missing.
    For example: ecto://USER:PASS@HOST/DATABASE
    """

config :hello_world, HelloWorld.Repo,
  # ssl: true,
  url: database_url,
  pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")

secret_key_base =
  System.get_env("SECRET_KEY_BASE") ||
    raise """
    environment variable SECRET_KEY_BASE is missing.
    You can generate one by calling: mix phx.gen.secret
    """

config :hello_world, HelloWorldWeb.Endpoint,
  http: [:inet6, port: String.to_integer(System.get_env("PORT") || "4000")],
  secret_key_base: secret_key_base

# ## Using releases (Elixir v1.9+)
#
# If you are doing OTP releases, you need to instruct Phoenix
# to start each relevant endpoint:
#
#     config :hello_world, HelloWorldWeb.Endpoint, server: true
#
# Then you can assemble a release by calling `mix release`.
# See `mix help release` for more information.

更新2:

我从import_config "config/prod.secret.exs"中删除了config/prod.exs我将config/prod.secret.exs重命名为config/releases.exs，并在文件中将use Mix.Config更改为import Config和未注释的config :hello_world, HelloWorldWeb.Endpoint, server: true
现在，当我尝试使用端口映射和--network =“host”这样运行容器时
docker run -it -e DATABASE_URL='ecto://postgres:123456@localhost/hello_world_dev' -e SECRET_KEY_BASE='blargblargblarg' -p 5432:5432 --network="host" hello_world:latest
我懂了

23:21:48.635 [error] Postgrex.Protocol (#PID<0.2615.0>) failed to connect: ** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused
23:21:48.635 [error] Postgrex.Protocol (#PID<0.2619.0>) failed to connect: ** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused
23:21:48.639 [info] Running HelloWorldWeb.Endpoint with cowboy 2.6.3 at :::4000 (http)
23:21:48.640 [info] Access HelloWorldWeb.Endpoint at http://example.com
23:21:49.938 [error] Postgrex.Protocol (#PID<0.2623.0>) failed to connect: ** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused

更新3:
我试过更改DATABASE_URL，但没有任何效果。

# adding port
DATABASE_URL='ecto://postgres:123456@localhost:5432/hello_world_dev'

# changing hostname to 127.0.0.1
DATABASE_URL='ecto://postgres:123456@127.0.0.1/hello_world_dev'

# changing hostname to 127.0.0.1 and adding port
DATABASE_URL='ecto://postgres:123456@127.0.0.1:5432/hello_world_dev'

# changing hostname to 0.0.0.0
DATABASE_URL='ecto://postgres:123456@0.0.0.0/hello_world_dev'

# changing hostname to 0.0.0.0 and adding port
DATABASE_URL='ecto://postgres:123456@0.0.0.0:5432/hello_world_dev'

# changing ecto to postgresql
DATABASE_URL='postgresql://postgres:123456@localhost/hello_world_dev'

# changing ecto to postgresql and localhost to 127.0.0.1
DATABASE_URL='postgresql://postgres:123456@127.0.0.1/hello_world_dev'

# changing ecto to postgresql and localhost to 127.0.0.1 with port
DATABASE_URL='postgresql://postgres:123456@127.0.0.1:5432/hello_world_dev'

# changing ecto to postgresql and localhost to 0.0.0.0
DATABASE_URL='postgresql://postgres:123456@0.0.0.0/hello_world_dev'

# changing ecto to postgresql and localhost to 0.0.0.0 with port
DATABASE_URL='postgresql://postgres:123456@0.0.0.0:5432/hello_world_dev'

¯\_(ツ)_/¯

Answer 1

有一个很好的sample repo配置用于生产就绪的构建和部署周期。它包含一个ansible设置，该设置将维护docker镜像，在docker镜像中构建phoenix应用程序，并在生产服务器上执行自动版本化的发行。

我建议您阅读the blog post guide