How to start a rails task as a service - ruby-on-rails

Question

I have a TCP server written in the rails application as a rails task.
However it can be started from as:
rails socketing:start
and the process will start executing if wanted it to be a task that keep on running in the beckground them change it as:
nohup rails socketing:start &
and will be keep on working in backgroup as the tcp server has multi threading implemented into it if there is an error that will stop only 1 thread.
Now I would like this process to be started by the service at the boottime of the ubuntu server for that created a service and enabled it.
But the code break
can you please suggest a way out
My service is written as:
[Unit]
Description = TCP at 51234
After = network.target
[Service]
Environment="HOME=/home/vidur"
ExecStart = /home/vidur/rails_app/tukaweb/custom_script.sh
[Install]
WantedBy = multi-user.target
My custom_script.sh as:
#!/bin/bash
cd /home/vidur/rails_app/project_dir
/home/vidur/.rbenv/shims/bundler exec rake rails socketing:start
Start the service as:
sudo systemctl start socketing.service
It give o/p as:
Jun 10 17:45:31 Vidur-PC systemd[1]: Started TCP at 51234.
Jun 10 17:45:31 Vidur-PC systemd[1]: socketing.service: Succeeded.
But did not start the rails task or even recognise rails environment:
I have rails task as:
task start: :environment do
require 'socket'
puts "Started TCP Server at PORT 53492"
server = TCPServer.new 51324 # Server bound to port 51234
loop do
Thread.start(server.accept) do |client|
client.close
end
end
p "result = #{result}"
p 'Bye'
end
This code gives following error:
Jun 10 19:16:40 Vidur-PC systemd[1]: Started TCP at 53492.
Jun 10 19:16:43 Vidur-PC custom_script.sh[60012]: rake aborted!
Jun 10 19:16:43 Vidur-PC custom_script.sh[60012]: ArgumentError: couldn't find login name -- expanding `~'
Jun 10 19:16:43 Vidur-PC custom_script.sh[60012]: /home/vidur/rails_app/tukaweb/config/application.rb:8:in `<top (required)>'
Jun 10 19:16:43 Vidur-PC custom_script.sh[60012]: /home/vidur/rails_app/tukaweb/Rakefile:4:in `require_relative'
Jun 10 19:16:43 Vidur-PC custom_script.sh[60012]: /home/vidur/rails_app/tukaweb/Rakefile:4:in `<top (required)>'
Jun 10 19:16:43 Vidur-PC custom_script.sh[60012]: /home/vidur/.rbenv/versions/2.7.2/bin/bundler:23:in `load'
Jun 10 19:16:43 Vidur-PC custom_script.sh[60012]: /home/vidur/.rbenv/versions/2.7.2/bin/bundler:23:in `<main>'
Jun 10 19:16:43 Vidur-PC custom_script.sh[60012]: (See full trace by running task with --trace)
Jun 10 19:16:44 Vidur-PC systemd[1]: socketing.service: Main process exited, code=exited, status=1/FAILURE
Jun 10 19:16:44 Vidur-PC systemd[1]: socketing.service: Failed with result 'exit-code'.
updated application.rb file:
require_relative 'boot'
require 'rails/all'
# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)
module TukaWeb
class Application < Rails::Application
# Initialize configuration defaults for originally generated Rails version.
config.load_defaults 5.1
if Rails.env.development?
config.active_job.queue_adapter = :async
else
config.active_job.queue_adapter = :sidekiq
end
config.generators.javascript_engine = :js
config.action_dispatch.default_headers = {
'Access-Control-Allow-Origin' => 'https://tukadata.tukatech.com',
'Access-Control-Request-Method' => %w{GET POST OPTIONS}.join(",")
}
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.
end
end
It stated the tcp process rake task but for the root user only.
DB Error left:
`connect': Access denied for user 'root'#'localhost'
but if run the process normal then it run.

Answer 1

issue was with puma he need home so updated service as:
[Unit]
Description = TCP at 51234
After = network.target
[Service]
Environment="HOME=/home/vidur"
ExecStart = /home/vidur/rails_app/tukaweb/custom_script.sh
[Install]
WantedBy = multi-user.target