clustering phoenix app

Questions / Help
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1

I followed this guide

I have set DNS_CLUSTER_QUERY, RELEASE_COOKIE and FLY_APP_NAME as secrets but can’t get the clustering and see this error in the logs. I am using docker, What am I missing ?

image
image1200×96 49 KB

2

Did you set them in your rel/env.sh.eex as the error shows?

If you ran fly launch it should have tried to inject these into the file for you, but ensure your rel/env.sh looks like this:

#!/bin/sh

export ERL_AFLAGS="-proto_dist inet6_tcp"
export RELEASE_DISTRIBUTION=name
export RELEASE_NODE="${FLY_APP_NAME}-${FLY_IMAGE_REF##*-}@${FLY_PRIVATE_IP}"
3

yes I have the file and it seems ok, I am using docker.io/hexpm/elixir:1.16.1-erlang-26.2.2-alpine-3.19.1

image
image1275×255 32 KB

4

What does your Dockerfile look like? RELEASE_DISTRIBUTION=name is what is setting the “longnames” so if you are still having that error, then the release/beam is not executing that env file.

5 
FROM docker.io/hexpm/elixir:1.16.1-erlang-26.2.2-alpine-3.19.1 AS base

RUN apk add --no-cache --virtual build-deps \
  build-base \
  git \
  ca-certificates

ENV PROJECT_ROOT /src/maverick

ENV PATH ${PROJECT_ROOT}/bin:$PATH

WORKDIR ${PROJECT_ROOT}

# Install Hex+Rebar
RUN mix local.hex --force && mix local.rebar --force

ARG MIX_ENV
ARG S3_ACCESS_KEY
ARG S3_SECRET_KEY

ENV MIX_ENV prod
ENV S3_ACCESS_KEY="${S3_ACCESS_KEY}"
ENV S3_SECRET_KEY="${S3_SECRET_KEY}"

COPY mix.exs mix.lock ./
RUN mix deps.get --only prod
RUN mkdir config
# copy compile-time config files before we compile dependencies
# to ensure any relevant config change will trigger the dependencies
# to be re-compiled.
# Copy common configuration files
COPY config/*.exs config/
# Copy environment-specific configuration file based on RELEASE_ENV
RUN mix deps.compile

COPY priv priv
COPY assets assets

# compile assets
RUN mix assets.deploy

# compile and build the release
COPY lib lib
RUN MIX_ENV=prod mix compile
# changes to config/runtime.exs don't require recompiling the code
COPY config/runtime.exs config/
# uncomment COPY if rel/ exists
# COPY rel rel
RUN MIX_ENV=prod mix release

# ---- Application Stage ----
FROM docker.io/alpine:3.19.1 AS app

ENV LANG=C.UTF-8

# Install openssl
RUN apk add --no-cache --virtual build-dep \
  build-base \
  openssl \
  ncurses \
  ffmpeg

ENV PROJECT_ROOT /src/maverick

ENV PATH ${PROJECT_ROOT}/bin:$PATH

WORKDIR ${PROJECT_ROOT}

# set build ENV
ARG MIX_ENV
ENV MIX_ENV prod

COPY --from=base ${PROJECT_ROOT}/_build/${MIX_ENV}/rel/maverick ./

ENTRYPOINT [ "bin/maverick" ]

# Usage:
#  * build: sudo docker image build -t elixir/maverick .
#  * shell: sudo docker container run --rm -it --entrypoint "" -p 127.0.0.1:4000:4000 elixir/maverick sh
#  * run:   sudo docker container run --rm -it -p 127.0.0.1:4000:4000 --name maverick elixir/maverick
#  * exec:  sudo docker container exec -it maverick sh
#  * logs:  sudo docker container logs --follow --tail 100 maverick
CMD [ "start" ]
6

You need to uncomment this line :slight_smile:

2 Likes
7

It works, thanks

8

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