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dnsmasq from package 'dnsmasq-base' starts with a (from libvirt) generated configuration: /var/lib/libvirt/dnsmasq/default.conf.
this configuration file is not directly editable because it gets overwritten from libvirt.
there is no possibility to set 'no-dhcp-interface=eth0' per 'libvirt'.
 
# ###########################################################
# deactivate dhcp in dnsmasq per libvirt
 
# dnsmasq listen on port 53 (dns) and 67 (dhcp)
j@ubuntu:~$ sudo netstat -taupen | grep -E ':53|:67'
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 0 9817 1218/dnsmasq

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Installing Ruby on Rails in Ubuntu 18.04 without any Ruby Manager

1.- As Root
  -- Install Ruby and other packages you could be needing for Rails
  apt-get install ruby ruby-dev sqlite3  gcc g++ make zlib1g-dev
  gem update system 3.0.8
  gem install bundler
  -- Install Node
   curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash - && \
   apt-get install -y nodejs python-requests python-ipaddr && \

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apt update
apt-get install -y build-essential sudo apt-utils dialog
wget https://packages.erlang-solutions.com/erlang-solutions_2.0_all.deb 
sudo dpkg -i erlang-solutions_2.0_all.deb
sudo apt-get update
sudo apt-get install erlang
sudo apt-get install elixir
curl -sL https://deb.nodesource.com/setup_13.x | sudo -E bash - 
sudo apt-get update && apt-get install -y nodejs
node -v

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sudo apt-get install nginx
sudo ufw allow OpenSSH
sudo ufw allow http
sudo ufw allow https
sudo ufw allow 4000
sudo ufw enable
yes
systemctl status nginx
sudo nano /etc/nginx/sites-available/default
sudo nano /var/www/html/index.nginx-debian.html

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sudo apt install git
ssh-keygen
cat /home/user/.ssh/id_rsa.pub
copy the content
go to the github.com/user/myapp-repository/settings
  ADD DEPLOY KEY
git clone git@github.com:user/myapp-repository.git
cd myapp
git pull
Already up to date.

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#
# if you are using RVM installed system wide (root)
# REMEMBER: if you are using RVM system wide NEVER run sudo gem install !!!!
#

rvmsudo gem install rspec rspec-rails rspec-rails-matchers

#
# if you are using RVM only on your local user or not using RVM at all
#

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#Create a new folder
  mkdir RescueFolder
  cd RescueFolder
#Make the image backup from the container with problems.
  docker commit <container-id>  <backup-image-name>
#then run a new container with that image
  docker run -ti --entrypoint=sh <backup-image-name>
#in other terminal session se the temporary container name that is running
  docker ps
  CONTAINER ID        IMAGE                           NAMES

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Ruby on Rails Cheatsheet

Architecture

Create a new application

Install the Rails gem if you haven't done so before

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# Puma can serve each request in a thread from an internal thread pool.
# The `threads` method setting takes two numbers: a minimum and maximum.
# Any libraries that use thread pools should be configured to match
# the maximum value specified for Puma. Default is set to 5 threads for minimum
# and maximum; this matches the default thread size of Active Record.
# More: https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server#threads
#
threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
threads threads_count, threads_count

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desc 'Stop rails server'
task :stop do
  File.new("tmp/pids/server.pid").tap { |f| Process.kill 9, f.read.to_i }.delete
end

desc 'Starts rails server'
task :start do
  Process.exec("rails s puma -d")
end