Deploy Rails 5.1 / Webpacker app with Capistrano - ruby-on-rails

Question

I have an Ubuntu server to deploy my Rails projects. In my Ubuntu server I had RVM.
Now I want to deploy new projects with Rails 5.1 and webpacker. To deploy this projects, I've installed NVM, npm and yarn in my Ubuntu server.
In my Rails 5.1 / Webpacker project I have following gems for capistrano deployment:
Gemfile
group :development do
gem 'capistrano-rails'
gem 'capistrano-rvm'
gem 'capistrano-passenger'
gem 'capistrano-nvm', require: false
gem 'capistrano-yarn'
end
In deploy.rb I've added some configurations for capistrano nvm and capistrano yarn.
deploy.rb
set :nvm_type, :user # or :system, depends on your nvm setup
set :nvm_node, 'v7.10.0'
set :nvm_map_bins, %w{node npm yarn}
set :yarn_target_path, -> { release_path.join('client') } #
set :yarn_flags, '--production --silent --no-progress' # default
set :yarn_roles, :all # default
set :yarn_env_variables, {}
Also I've added node_modules in linked_dirs.
deploy.rb
set :linked_dirs, %w{log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system node_modules client/node_modules}
The problem comes when I execute cap deploy in assets:precompile step. Next you have the error log.
terminal log
00:10 deploy:assets:precompile
01 /usr/local/rvm/bin/rvm 2.4.1#project do bundle exec rake assets:precompile
01 Yarn executable was not detected in the system.
01 Download Yarn at https://yarnpkg.com/en/docs/install
01 /home/deploy/rails/241/project/shared/bundle/ruby/2.4.0/bin/rake: No such file or directory - node
01 Node.js not installed. Please download and install Node.js https://nodejs.org/en/download/
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing on host xxx.xxx.xxx.xxx: rake exit status: 1
rake stdout: Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
/home/deploy/rails/241/project/shared/bundle/ruby/2.4.0/bin/rake: No such file or directory - node
Node.js not installed. Please download and install Node.js
https://nodejs.org/en/download/
rake stderr: Nothing written
SSHKit::Command::Failed: rake exit status: 1
rake stdout: Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
/home/deploy/rails/241/project/shared/bundle/ruby/2.4.0/bin/rake: No such file or directory - node
Node.js not installed. Please download and install Node.js
https://nodejs.org/en/download/
rake stderr: Nothing written
Tasks: TOP => deploy:assets:precompile
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing on host xxx.xxx.xxx.xxx: rake exit status: 1
rake stdout: Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
/home/deploy/rails/241/project/shared/bundle/ruby/2.4.0/bin/rake: No such file or directory - node
Node.js not installed. Please download and install Node.js
https://nodejs.org/en/download/
rake stderr: Nothing written
** DEPLOY FAILED
** Refer to log/capistrano.log for details. Here are the last 20 lines:
DEBUG [016276ab] * spring (2.0.1)
DEBUG [016276ab] * spring-watcher-listen (2.0.1)
DEBUG [016276ab] * web-console (3.5.0)
DEBUG [016276ab] Install missing gems with `bundle install`
DEBUG [016276ab] Finished in 0.677 seconds with exit status 1 (failed).
INFO [86e74b01] Running /usr/local/rvm/bin/rvm 2.4.1#project do bundle install --path /home/deploy/rails/241/project/shared/bundle --without development test --deployment --quiet on xxx.xxx.xxx.xxx
DEBUG [86e74b01] Command: cd /home/deploy/rails/241/project/releases/20170511083021 && ( export NODE_VERSION="v7.10.0" ; /usr/local/rvm/bin/rvm 2.4.1#project do bundle install --path /home/deploy/rails/241/project/shared/bundle --without development test --deployment --quiet )
DEBUG [86e74b01] Warning, new version of rvm available '1.29.1', you are using older version '1.26.11'.
You can disable this warning with: echo rvm_autoupdate_flag=0 >> ~/.rvmrc
You can enable auto-update with: echo rvm_autoupdate_flag=2 >> ~/.rvmrc
INFO [86e74b01] Finished in 3.209 seconds with exit status 0 (successful).
DEBUG [4a428031] Running if test ! -d /home/deploy/rails/241/project/releases/20170511083021; then echo "Directory does not exist '/home/deploy/rails/241/project/releases/20170511083021'" 1>&2; false; fi on xxx.xxx.xxx.xxx
DEBUG [4a428031] Command: if test ! -d /home/deploy/rails/241/project/releases/20170511083021; then echo "Directory does not exist '/home/deploy/rails/241/project/releases/20170511083021'" 1>&2; false; fi
DEBUG [4a428031] Finished in 0.066 seconds with exit status 0 (successful).
INFO [d225a8b5] Running /usr/local/rvm/bin/rvm 2.4.1#project do bundle exec rake assets:precompile on xxx.xxx.xxx.xxx
DEBUG [d225a8b5] Command: cd /home/deploy/rails/241/project/releases/20170511083021 && ( export NODE_VERSION="v7.10.0" RAILS_ENV="production" ; /usr/local/rvm/bin/rvm 2.4.1#project do bundle exec rake assets:precompile )
DEBUG [d225a8b5] Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
DEBUG [d225a8b5] /home/deploy/rails/241/project/shared/bundle/ruby/2.4.0/bin/rake: No such file or directory - node
DEBUG [d225a8b5] Node.js not installed. Please download and install Node.js https://nodejs.org/en/download/
Thanks in advance!

Answer 1

I prefer to compile assets locally and then copy to the production servers with rsync:
# lib/capistrano/tasks/precompile.rake
namespace :assets do
desc 'Precompile assets locally and then rsync to web servers'
task :precompile do
run_locally do
with rails_env: stage_of_env do
execute :bundle, 'exec rake assets:precompile'
end
end
on roles(:web), in: :parallel do |server|
run_locally do
execute :rsync,
"-a --delete ./public/packs/ #{fetch(:user)}##{server.hostname}:#{shared_path}/public/packs/"
execute :rsync,
"-a --delete ./public/assets/ #{fetch(:user)}##{server.hostname}:#{shared_path}/public/assets/"
end
end
run_locally do
execute :rm, '-rf public/assets'
execute :rm, '-rf public/packs'
end
end
end
# config/deploy.rb
after 'deploy:updated', 'assets:precompile'
In your Capfile you need to include all the capistrano tasks:
# Load custom tasks from `lib/capistrano/tasks` if you have any defined
Dir.glob('lib/capistrano/tasks/**/*.rake').each { |r| import r }
This eliminates the need to install node and yarn on the production servers.
Of course you need node and yarn installed locally

Answer 2

What worked for me was making sure NVM was included in the PATH. By default, in a bash terminal, NVM adds its environment variables to the end of ~/.bashrc, but much of that file is not usually executed in a non-interactive terminal (which Capistrano runs in). I found this comment helpful:
Put your NVM source script in your .bashrc which is still evaluated even during an non-interactive SSH session. Just make sure you place the declarations at the top, before the case statement:
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion" # This loads nvm bash_completion
# If not running interactively, don't do anything
case $- in
*i*) ;;
*) return;;
esac

Answer 3

The error tells you pretty much what's wrong. Neither Yarn or Node can be found on the server. Your installation might be incorrect.
Follow instructions to install both here:
https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions
and here:
https://yarnpkg.com/lang/en/docs/install/#linux-tab
Then make sure you can call:
yarn
node
On the server. If not, you might need to add paths to executables into your PATH variable

Answer 4

First - Install Yarn
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt update && sudo apt install yarn
Second - Install NodeJS(now 14 is newest):
curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
sudo apt-get install -y nodejs