Configure debug in vscode to Ruby on Rails and Docker - ruby-on-rails

Question

when I try to configure debug in vscode for a Ruby on Rails app with docker, follow my Dockerfile:
FROM ruby:2.6.5
# add nodejs and yarn dependencies for the frontend
RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - && \
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
# Instala nossas dependencias
RUN apt-get update && apt-get install -qq -y --no-install-recommends \
nodejs yarn build-essential libpq-dev imagemagick git-all nano
# Instalar bundler
RUN gem install bundler
# Seta nosso path
ENV INSTALL_PATH /onebitexchange
# Cria nosso diretório
RUN mkdir -p $INSTALL_PATH
# Seta o nosso path como o diretório principal
WORKDIR $INSTALL_PATH
# Copia o nosso Gemfile para dentro do container
COPY Gemfile ./
# Seta o path para as Gems
ENV BUNDLE_PATH /gems
# Copia nosso código para dentro do container
COPY . .
My docker-compose.yml:
version: "3.8"
services:
db:
image: "postgres:12.2"
environment:
- POSTGRES_PASSWORD=postgres
volumes:
- postgres:/var/lib/postgresql/data
app:
build: .
command: bash start.sh
ports:
- "3000:3000"
- "1234:1234"
environment:
- DB_PASSWORD=postgres
volumes:
- .:/onebitexchange
- gems:/gems
depends_on:
- db
volumes:
postgres:
gems:
My start.sh:
# Instala as Gems
bundle check || bundle install
​
# Roda nosso servidor
# bundle exec puma -C config/puma.rb
bundle exec rdebug-ide --host 0.0.0.0 --port 1234 --dispatcher-port 26162 -- /onebitexchange/bin/rails s -b 0.0.0.0 -e development
my launch.json:
{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "Attach to Docker",
"type": "Ruby",
"request": "attach",
"remotePort": "1234",
"remoteHost": "127.0.0.1",
"remoteWorkspaceRoot": "/onebitexchange",
"cwd": "${workspaceRoot}",
"showDebuggerOutput": true
}
]
}
my project work fine if I start without debug (bundle exec puma -C config/puma.rb), but when I try start with debug container I get the follow messages ( no problems yet):
Successfully built c60b5fc8b26a
Successfully tagged onebit_exchange_app:latest
Starting onebit_exchange_db_1 ... done
Recreating onebit_exchange_app_1 ... done
Attaching to onebit_exchange_db_1, onebit_exchange_app_1
db_1 |
db_1 | PostgreSQL Database directory appears to contain a database; Skipping initialization
db_1 |
db_1 | 2020-05-19 16:38:29.734 UTC [1] LOG: starting PostgreSQL 12.2 (Debian 12.2-2.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1 | 2020-05-19 16:38:29.734 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
db_1 | 2020-05-19 16:38:29.734 UTC [1] LOG: listening on IPv6 address "::", port 5432
db_1 | 2020-05-19 16:38:29.745 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db_1 | 2020-05-19 16:38:29.784 UTC [28] LOG: database system was shut down at 2020-05-19 14:38:39 UTC
db_1 | 2020-05-19 16:38:29.791 UTC [1] LOG: database system is ready to accept connections
app_1 | The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
app_1 | The Gemfile's dependencies are satisfied
app_1 | start.sh: line 3: $'\342\200\213': command not found
app_1 | Fast Debugger (ruby-debug-ide 0.7.2, debase 0.2.4.1, file filtering is supported) listens on 0.0.0.0:1234
but when I start debug in vscode:
app_1 | => Booting Puma
app_1 | => Rails 6.0.2.2 application starting in development
app_1 | => Run `rails server --help` for more startup options
app_1 | A server is already running. Check /onebitexchange/tmp/pids/server.pid.
app_1 | Exiting
onebit_exchange_app_1 exited with code 1
Thank you

Answer 1

Looks like you have some funny encoding on line 3 of your start.sh file that isn't being interpreted as a comment, which is likely causing the commented line to actually start a server.
When the bundle exec rdebug-ide --host 0.0.0.0 --port 1234... command executes, it throws the 'port in use' error because there is already a server running on port 1234 from the first command.
If you remove the commented-out lines you should be good to go.