Rails, Capistrano - Compilation failed without serving any debug log

Question

I'm trying to deploy my Rails5 app to AWS EC2 instance using Capistrano3. However when it comes to assets compile, it fails without logging any reasons. Where should I start with in such case? Though I set log_level: :debug to config/deploy/staging.rb there was no more info. log/capistrano.log is also the same.

I tried running bundle exec rake assets:precompile RAILS_ENV=staging in local and succeeded.

"log/capistrano.log" 50149L, 2790165C


** DEPLOY FAILED
** Refer to log/capistrano.log for details. Here are the last 20 lines:


 DEBUG [39e6a15a]



 DEBUG [39e6a15a]

 DEBUG [39e6a15a]   warning " > [email protected]" has incorrect peer dependency "webpack@^4.0.0".

 DEBUG [39e6a15a]

[4/4] Building fresh packages...

success Saved lockfile.



 DEBUG [39e6a15a]

 DEBUG [39e6a15a]   Done in 38.64s.

 DEBUG [39e6a15a]

 DEBUG [39e6a15a]   Webpacker is installed 🎉 🍰

 DEBUG [39e6a15a]

 DEBUG [39e6a15a]   Using /home/deploy/apps/neuroweb/releases/20180507061527/config/webpacker.yml file for setting up webpack paths

 DEBUG [39e6a15a]

 DEBUG [39e6a15a]   Compiling…

 DEBUG [39e6a15a]

 DEBUG [39e6a15a]   Compilation failed:

gems I use to deploy:

  gem 'capistrano'
  gem 'capistrano-rails'
  gem 'capistrano-bundler'
  gem 'capistrano-rbenv'
  gem 'capistrano3-unicorn'

config/deploy/staging.rb

lock "3.10.2"

set :log_level, :debug
set :repo_url,        'xxxxxxxx'
set :application,     'neuroweb'
set :branch, 'staging'
set :keep_releases, 1
set :rbenv_ruby, '2.4.3'

# Don't change these unless you know what you're doing
set :use_sudo,        false
set :deploy_via,      :remote_cache
set :deploy_to,       "/home/deploy/apps/#{fetch(:application)}"


#set :linked_dirs, %w{vendor/bundle}
#set :linked_files, %w{ config/secrets.yml}
append :linked_files, ".env"
set :rbenv_type, :user


set :ssh_options, {
  port: 22,
  forward_agent: true,
  keys: ['~/.ssh/staging.pem'],
}
set :pty, true
server 'xxxx', roles: [:web, :app, :db], primary: true, user: 'ubuntu'
set :keep_releases, 1

set :stage, :staging
set :rails_env, 'staging'
set :unicorn_exec, -> { "unicorn_rails" }
set :unicorn_config_path, -> { File.join(current_path, "config", "unicorn",  "staging.rb") }
set :unicorn_rack_env, 'staging'
set :user,            'ubuntu' #deploy
set :unicorn_pid, "/home/deploy/apps/neuroweb/shared/tmp/pids/unicorn.pid"




namespace :deploy do
  desc "Upload secrets.yml to the shared/config directory."
  task :secrets_yml do
    unless File.exist?('tmp/secrets.yml')
      secrets = { fetch(:stage).to_s =>
        { 'secret_key_base' => SecureRandom.hex(64) } }
      File.open('tmp/secrets.yml', 'w') do |f|
        f.write secrets.to_yaml
      end
    end

    on roles(:app) do
      unless test "[ -f #{shared_path}/config/secrets.yml ]"
        unless test "[ -d #{shared_path}/config ]"
          execute "/bin/mkdir -p #{shared_path}/config/"
        end
        upload! "tmp/secrets.yml", "#{shared_path}/config/secrets.yml"
      end
    end

  end # secrets_yml





  #
  # delayed_job
  #
  task :restart do
    invoke 'unicorn:restart'
    invoke 'delayed_job:restart'
  end
end #deploy


namespace :delayed_job do

  def args
    fetch(:delayed_job_args, "")
  end

  def delayed_job_roles
    fetch(:delayed_job_server_role, :app)
  end

  desc 'Stop the delayed_job process'
  task :stop do
    on roles(delayed_job_roles) do
      within release_path do
        with rails_env: fetch(:rails_env) do
          execute :bundle, :exec, :'bin/delayed_job', :stop
        end
      end
    end
  end

  desc 'Start the delayed_job process'
  task :start do
    on roles(delayed_job_roles) do
      within release_path do
        with rails_env: fetch(:rails_env) do
          execute :bundle, :exec, :'bin/delayed_job', args, :start
        end
      end
    end
  end

  desc 'Restart the delayed_job process'
  task :restart do
    on roles(delayed_job_roles) do
      within release_path do
        with rails_env: fetch(:rails_env) do
          execute :bundle, :exec, :'bin/delayed_job', args, :restart
        end
      end
    end
  end

end


after 'deploy:publishing', 'deploy:restart'

webpacker.yml

default: &default
  source_path: app/javascript
  source_entry_path: packs
  public_output_path: packs
  cache_path: tmp/cache/webpacker

  # Additional paths webpack should lookup modules
  # ['app/assets', 'engine/foo/app/assets']
  resolved_paths: []

  # Reload manifest.json on all requests so we reload latest compiled packs
  cache_manifest: false

  extensions:
    - .jsx
    - .vue
    - .js
    - .sass
    - .scss
    - .css
    - .module.sass
    - .module.scss
    - .module.css
    - .png
    - .svg
    - .gif
    - .jpeg
    - .jpg

development:
  <<: *default
  compile: true

  # Reference: https://webpack.js.org/configuration/dev-server/
  dev_server:
    https: false
    host: localhost
    port: 3035
    public: localhost:3035
    hmr: false
    # Inline should be set to true if using HMR
    inline: true
    overlay: true
    compress: true
    disable_host_check: true
    use_local_ip: false
    quiet: false
    headers:
      'Access-Control-Allow-Origin': '*'
    watch_options:
      ignored: /node_modules/


test:
  <<: *default
  compile: true

  # Compile test packs to a separate directory
  public_output_path: packs-test

production:
  <<: *default
  compile: false
  cache_manifest: true

staging:
  <<: *default
  compile: false
  cache_manifest: true

Answer 1

This is likely caused by running out of memory.

Look in your system log for something like this to confirm:

Out of memory: Kill process 2736 (node) score 222 or sacrifice child

The solution is to upgrade to a machine (or virtual machine) that has more memory.

Answer 2

Try to run ./bin/webpack direct on the server.

I had the same issue and this showed an error message to me.