Steps for Unicorn & Nginx Deployment in Rails
Unicorn Configuration
1. Add unicorn in gem file
gem 'unicorn'
2. Create new file in config folder
$ vim config/unicorn.rb
Paste the below codes in unicorn.rb file
# set path to application
app_dir = File.expand_path("../..", __FILE__)
shared_dir = "#{app_dir}/shared"
working_directory app_dir
# Set unicorn options
worker_processes 2
preload_app true
timeout 30
# Set up socket location
listen "#{shared_dir}/sockets/unicorn.sock", :backlog => 64
# Logging
stderr_path "#{shared_dir}/log/unicorn.stderr.log"
stdout_path "#{shared_dir}/log/unicorn.stdout.log"
# Set master PID location
pid "#{shared_dir}/pids/unicorn.pid"
3. Create the folder were referred in unicorn.rb files
$ mkdir -p shared/pids shared/sockets shared/log
Unicorn init script setup
1. Create init script file
$ sudo vim /etc/init.d/unicorn_serversetup
2. Paste the below script in unicorn_serversetup file
#!/bin/sh
### BEGIN INIT INFO
# Provides: unicorn
# Required-Start: $all
# Required-Stop: $all
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: starts the unicorn app server
# Description: starts unicorn using start-stop-daemon
### END INIT INFO
set -e
USAGE="Usage: $0 <start|stop|restart|upgrade|rotate|force-stop>"
# app settings
USER="rajkumar"
APP_NAME="/Rajkumar/Projects/serversetup"
APP_ROOT="/home/$USER/$APP_NAME"
ENV="production"
# environment settings
PATH="/home/$USER/.rbenv/shims:/home/$USER/.rbenv/bin:$PATH"
CMD="cd $APP_ROOT && bundle exec unicorn -c config/unicorn.rb -E $ENV -D"
PID="$APP_ROOT/shared/pids/unicorn.pid"
OLD_PID="$PID.oldbin"
# make sure the app exists
cd $APP_ROOT || exit 1
sig () {
test -s "$PID" && kill -$1 `cat $PID`
}
oldsig () {
test -s $OLD_PID && kill -$1 `cat $OLD_PID`
}
case $1 in
start)
sig 0 && echo >&2 "Already running" && exit 0
echo "Starting $APP_NAME"
su - $USER -c "$CMD"
;;
stop)
echo "Stopping $APP_NAME"
sig QUIT && exit 0
echo >&2 "Not running"
;;
force-stop)
echo "Force stopping $APP_NAME"
sig TERM && exit 0
echo >&2 "Not running"
;;
restart|reload|upgrade)
sig USR2 && echo "reloaded $APP_NAME" && exit 0
echo >&2 "Couldn't reload, starting '$CMD' instead"
$CMD
;;
rotate)
sig USR1 && echo rotated logs OK && exit 0
echo >&2 "Couldn't rotate logs" && exit 1
;;
*)
echo >&2 $USAGE
exit 1
;;
esac
3. Give user name and app name and save the files
4. Update the script's permissions and enable Unicorn to start on boot:
$ sudo chmod 755 /etc/init.d/unicorn_serversetup
$ sudo update-rc.d unicorn_serversetup defaults
5. start the unicorn
$ sudo service unicorn_serversetup start
6. Your application will run shared/sockets/unicorn.sock
Install and Configure Nginx
1. $ sudo apt-get install nginx
2. $ sudo vi /etc/nginx/sites-available/default
3. configure below items
upstream app {
# Path to Unicorn SOCK file, as defined previously
server unix:/home/deploy/appname/shared/sockets/unicorn.sock fail_timeout=0;
}
server {
listen 80;
server_name localhost;
root /home/deploy/appname/public;
try_files $uri/index.html $uri @app;
location @app {
proxy_pass http://app;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
}
error_page 500 502 503 504 /500.html;
client_max_body_size 4G;
keepalive_timeout 10;
}
4. $ sudo service nginx restart
5. Any 403 error you can check the sudo /var/log/nginx/error.log
