Stefan-Wintermeyers-MacBook-Air:~ xyz$ rails new blog
[...]
Stefan-Wintermeyers-MacBook-Air:~ xyz$ cd blog
Stefan-Wintermeyers-MacBook-Air:blog xyz$ rails generate scaffold post subject content:text
[...]
Stefan-Wintermeyers-MacBook-Air:blog xyz$

# Use at least one worker per core if you're on a dedicated server,
# more will usually help for _short_ waits on databases/caches.
worker_processes 4

# Since Unicorn is never exposed to outside clients, it does not need to
# run on the standard HTTP port (80), there is no reason to start Unicorn
# as root unless it's from system init scripts.
# If running the master process as root and the workers as an unprivileged
# user, do this to switch euid/egid in the workers (also chowns logs):
user "deployer", "www-data"

# Help ensure your application will always spawn in the symlinked
# "current" directory that Capistrano sets up.
APP_PATH = "/var/www/blog/current"
working_directory APP_PATH

# listen on both a Unix domain socket and a TCP port,
# we use a shorter backlog for quicker failover when busy
listen "/tmp/unicorn.blog.sock", :backlog => 64
listen 8080, :tcp_nopush => true

# nuke workers after 30 seconds instead of 60 seconds (the default)
timeout 30

# feel free to point this anywhere accessible on the filesystem
pid APP_PATH + "/tmp/pids/unicorn.pid"

# By default, the Unicorn logger will write to stderr.
# Additionally, ome applications/frameworks log to stderr or stdout,
# so prevent them from going to /dev/null when daemonized here:
stderr_path APP_PATH + "/log/unicorn.blog.stderr.log"
stdout_path APP_PATH + "/log/unicorn.blog.stdout.log"

before_fork do |server, worker|
  # the following is highly recomended for Rails + "preload_app true"
  # as there's no need for the master process to hold a connection
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.connection.disconnect!
  end

  # Before forking, kill the master process that belongs to the .oldbin PID.
  # This enables 0 downtime deploys.
  old_pid = "/tmp/unicorn.my_site.pid.oldbin"
  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      # someone else did our job for us
    end
  end
end

after_fork do |server, worker|
  # the following is *required* for Rails + "preload_app true",
  if defined?(ActiveRecord::Base)
    ActiveRecord::Base.establish_connection
  end

  # if preload_app is true, then you may also want to check and
  # restart any other shared sockets/descriptors such as Memcached,
  # and Redis.  TokyoCabinet file handles are safe to reuse
  # between any number of forked children (assuming your kernel
  # correctly implements pread()/pwrite() system calls)
end

before_exec do |server|
  ENV["BUNDLE_GEMFILE"] = "/var/www/blog/current/Gemfile"
end

Stefan-Wintermeyers-MacBook-Air:blog xyz$ capify .  
[add] writing './Capfile'
[add] writing './config/deploy.rb'
[done] capified!
Stefan-Wintermeyers-MacBook-Air:blog xyz$

require "bundler/capistrano"
require "rvm/capistrano"
set :rvm_ruby_string, '1.9.3'

server "ip.addresse.ihres.servers", :web, :app, :db, primary: true

set :application, "blog"
set :user, "deployer"
set :deploy_to, "/var/www/#{application}"
set :deploy_via, :remote_cache
set :use_sudo, false

set :scm, "git"
set :repository, "git@github.com:ihr_github_account/#{application}.git"
set :branch, "master"

default_run_options[:pty] = true
ssh_options[:forward_agent] = true

after 'deploy', 'deploy:cleanup'
after 'deploy', 'deploy:migrate'

namespace :deploy do
  %w[start stop restart reload].each do |command|
    desc "#{command} unicorn server"
    task command, roles: :app, except: {no_release: true} do
      run "sudo /etc/init.d/unicorn_#{application} #{command}"
    end
  end

  # Use this if you know what you are doing.
  #
  # desc "Zero-Downtime restart of Unicorn"
  # task :restart, :except => { :no_release => true } do
  #   run "sudo /etc/init.d/unicorn_#{application} reload"
  # end
end

load 'deploy'
# Uncomment if you are using Rails' asset pipeline
load 'deploy/assets'
Dir['vendor/gems/*/recipes/*.rb','vendor/plugins/*/recipes/*.rb'].each { |plugin| load(plugin) }
load 'config/deploy' # remove this line to skip loading any of the default tasks

Stefan-Wintermeyers-MacBook-Air:blog xyz$ git init
Initialized empty Git repository in /Users/xyz/blog/.git/
Stefan-Wintermeyers-MacBook-Air:blog xyz$ git add .
Stefan-Wintermeyers-MacBook-Air:blog xyz$ git commit -m 'first commit'
[...]
Stefan-Wintermeyers-MacBook-Air:blog xyz$ git remote add origin git@github.com:ihr_github_account/blog.git
Stefan-Wintermeyers-MacBook-Air:blog xyz$ git push -u origin master
[...]
Stefan-Wintermeyers-MacBook-Air:blog xyz$

deployer@debian:~$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/deployer/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/deployer/.ssh/id_rsa.
Your public key has been saved in /home/deployer/.ssh/id_rsa.pub.
The key fingerprint is:
ba:11:90:2a:e3:8f:5b:2e:70:99:50:86:a1:9a:2c:b7 deployer@debian
The key's randomart image is:
+--[ RSA 2048]----+
|.o               |
|o o  .           |
|.o  o            |
|+. . .           |
|*ooo  . S        |
|+++.   o         |
|.oE.  o          |
| .=    o         |
| ooo  .          |
+-----------------+
deployer@debian:~$ cat .ssh/id_rsa.pub 
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDJEGixOcPRdBMry7PPG/Rgla50EM+JPKGYGD/yJ8v7bdrfT68t2/eVbj6+YebWh1tRebE3qqouqmZjIlocr1j67SmfXZ/sswBT/pXOhP89JtHPMolx7rUQ8wQF3aDrnVDJG0gdvRm212vN2bou3N5dzhekmWmbS3R0ZGNM9ZgTw8rhTOd1M2QVTzyV1i1PehoFxOu1WIc1gN5C42zihbJ6fGgVb45WeKzXSi6bQ6PMKD1gAMJpXHPvKLhi0wLN0wNOJwa6BKR3pmgICSBuoziAhhCS/7gBDJnqRmx1zax/1CShJD3QEGHvofA9okYuYVqyrJi1hdF8ZgMnQCb31I21 deployer@debian
deployer@debian:~$

deployer@debian:~$ ssh git@github.com
The authenticity of host 'github.com (207.97.227.239)' can't be established.
RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,207.97.227.239' (RSA) to the list of known hosts.
PTY allocation request failed on channel 0
Hi ihr_github_account/blog! You've successfully authenticated, but GitHub does not provide shell access.
                 Connection to github.com closed.
deployer@debian:~$

#!/bin/bash

### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Unicorn webserver
# Description:       Unicorn webserver for the blog
### END INIT INFO

UNICORN=/home/deployer/.rvm/bin/bootup_unicorn
UNICORN_ARGS="-D -c /var/www/blog/current/config/unicorn.rb -E production"
KILL=/bin/kill
PID=/var/www/blog/shared/pids/unicorn.pid

sig () {
  test -s "$PID" && kill -$1 `cat $PID`
}

case "$1" in
        start)
                echo "Starting unicorn..."
                $UNICORN $UNICORN_ARGS
                ;;
        stop)
                sig QUIT && exit 0
                echo >&2 "Not running"
                ;;
        reload)
                sig USR2 && exit 0
                ;;
        restart)
                $0 stop
                $0 start
                ;;
        status)
                ;;
        *)
                echo "Usage: $0 {start|stop|reload|restart|status}"
                ;;
esac

root@debian:~# chmod +x /etc/init.d/unicorn_blog 
root@debian:~# update-rc.d -f unicorn_blog defaults
update-rc.d: using dependency based boot sequencing
root@debian:~# /etc/init.d/unicorn_blog start
root@debian:~# 

upstream unicorn {
  server unix:/tmp/unicorn.blog.sock fail_timeout=0;
}

server {
  listen 80 default deferred;
  # server_name example.com;
  root /var/www/blog/current/public;

  location / {
    gzip_static on;
  }

  location ^~ /assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }

  try_files $uri/index.html $uri @unicorn;
  location @unicorn {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://unicorn;
  }

  error_page 500 502 503 504 /500.html;
  client_max_body_size 4G;
  keepalive_timeout 10;
}

root@debian:~# mv /etc/nginx/conf.d/default.conf /etc/nginx/conf.d/default.backup
root@debian:~# /etc/init.d/nginx restart
Restarting nginx: nginx.
root@debian:~#