diff --git a/devops-service/INSTALL.md b/devops-service/INSTALL.md
new file mode 100644
index 0000000..6a15d63
--- /dev/null
+++ b/devops-service/INSTALL.md
@@ -0,0 +1,235 @@
+Installation guide
+=============
+
+This is the installation guide of the devops server.
+
+## Contents
+
+* [Software requirements](#software)
+    * [RHEL-based systems](#rhel)
+    * [Debian-based systems](#debian)
+* [System users](#users)
+* [Directories](#directories)
+* [RVM](#rvm)
+* [Downloads](#downloads)
+* [Gems](#gems)
+* [SSH configuration](#ssh)
+* [Knife configuration](#knife)
+* [Devops configuration](#clouds)
+    * [Openstack](#cloud_openstack)
+    * [Ec2](#cloud_ec2)
+* [Init script](#init)
+* [Run devops](#run)
+
+<h2 id="software">Software requirements</h2>
+
+Before installing devops, you should install system requirements: bash, gcc, make, wget, unzip, libxml2, libxslt
+
+<h3 id="rhel">RHEL-based systems</h3>
+
+	# yum install -y bash gcc make wget unzip gcc-c++ libxml2-devel libxslt-devel
+
+<h3 id="debian">Debian-based systems</h3>
+
+	# apt-get install bash gcc make wget unzip g++ libxml2-dev libxslt-dev
+
+<h2 id="users">System users</h2>
+
+Create user devops
+
+	# useradd -m -d /devops --system -s /bin/bash devops
+
+<h2 id="directories">Directories</h2>
+
+Create log directory:
+
+	# mkdir -p /var/log/devops
+	# chown devops: /var/log/devops
+
+Create pid directory:
+
+	# mkdir -p /var/run/devops
+	# chown devops: /var/run/devops
+
+Create devops directory:
+
+	# mkdir -p /devops/devops
+	# chown devops: /devops/devops
+
+Create ssh, chef directories:
+
+	# mkdir -p /devops/{.ssh,.chef}
+	# chown devops: /devops/{.ssh,.chef}
+
+Create bootstrap directory
+
+	# mkdir -p /devops/.chef/bootstrap
+	# chown devops: /devops/.chef/bootstrap
+
+Create devops public directory:
+
+	# mkdir -p /devops/devops/public
+	# chown devops: /devops/devops/public
+
+<h2 id="rvm">RVM</h2>
+
+You should install rvm with ruby 1.9 or use system ruby
+
+<h2 id="downloads">Downloads</h2>
+
+Download devops-service-master.zip from https://github.com/ggasoftware/devops-service into /tmp
+Unzip devops-service-master.zip
+
+	# unzip /tmp/devops-service-master.zip -d /tmp/
+
+Copy devops-service
+
+	# cp -rf /tmp/devops-service-master/devops-service/* /devops/devops
+	# chown devops: -R /devops/devops
+
+Create client gem
+
+	# cd /tmp/devops-service-master/devops-client/
+	# rake build
+	# cp pkg/devops-client*.gem /devops/devops/public/devops-client.gem
+	# chown devops: /devops/devops/public/devops-client.gem
+
+<h2 id="gems">Gems</h2>
+
+Install bundler
+
+	# gem install bundler
+
+Then run bundler
+
+	# cd /devops/devops && bundle install
+
+<h2 id="ssh">SSH configuration</h2>
+
+	# cat /devops/.ssh/config
+	StrictHostKeyChecking no
+	UserKnownHostsFile /dev/null
+
+<h2 id="knife">Knife configuration</h2>
+
+	# cat /devops/.chef/knife.rb
+	log_level                :info
+	log_location             STDOUT
+	node_name                "devops"
+	chef_server_url          "<Chef server host>"
+	validation_client_name   "chef-validator"
+	client_key               "/devops/.chef/client.pem"
+	validation_key           "/devops/.chef/validation.pem"
+
+Then you should create client 'devops' with admin privileges on your chef server and copy your client.pem and validation.pem into /devops/.chef
+
+	chown devops: /devops/.chef/client.pem
+	chmod 0600 /devops/.chef/client.pem
+	chown devops: /devops/.chef/validation.pem
+	chmod 0600 /devops/.chef/validation.pem
+
+<h2 id="configuration">Devops configuration</h2>
+
+Devops configuration file is /devops/devops/config.rb
+
+	# cat /devops/devops/config.rb
+	config[:knife_config_file] = "/devops/.chef/knife.rb"
+	config[:role_separator] = "_"
+	config[:mongo_host] = "<mongo host>"
+	config[:mongo_port] = 27017
+	config[:mongo_db] = "<mongo db name>"
+	config[:mongo_user] = "<mongo user name>"
+	config[:mongo_password] = "<mongo user password>"
+	config[:port] = 7070
+	config[:client_file] = "/devops/devops/public/devops-client.gem"
+	config[:public_dir] = "/devops/devops/public"
+
+<h3 id="cloud_openstack">Openstack</h3>
+
+To configure openstack cloud, you should add to /devops/devops/config.rb:
+
+	config[:openstack_username]    = "<username>"
+	config[:openstack_api_key]     = "<password>"
+	config[:openstack_auth_url]    = "http://<host>:5000/v2.0/tokens"
+	config[:openstack_tenant]      = "<tenant>"
+	config[:openstack_ssh_key]     = "<ssh key>"
+	config[:openstack_certificate] = "/devops/.ssh/openstack.pem"
+
+And copy your openstack certificate 'openstack.pem' into /devops/.ssh/
+
+<h3 id="cloud_ec2">Ec2</h3>
+
+To configure ec2 cloud, you should add to /devops/devops/config.rb:
+
+	config[:aws_access_key_id]     = "<access key id>"
+	config[:aws_secret_access_key] = "<secret access key"
+	config[:aws_ssh_key]           = "<ssh key>"
+	config[:aws_certificate]       = "/devops/.ssh/ec2.pem"
+	config[:aws_availability_zone] = "us-east-1e"
+
+And copy your ec2 certificate 'ec2.pem' into /devops/.ssh/
+
+<h2 id="init">Init script</h2>
+
+	# cat /etc/init.d/devops_service
+	#!/bin/bash
+	#
+	# devops_service: Start/Stop devops service
+	#
+	# chkconfig: - 80 05
+	# description: Enable devops service
+	user=devops
+	devops_home=/devops/devops
+	pid_file=/var/run/devops/devops.pid
+	log_file=/var/log/devops/service.log
+	port=7070
+	env=production
+	start() {
+	  echo "Starting devops service"
+	  PIDDIR="${pid_file%/?*}"
+	  if [ ! -f $PIDDIR ]; then
+	    mkdir -p $PIDDIR
+	    chown $user $PIDDIR
+	  fi
+	  su - $user -c "cd $devops_home && bundle exec thin -R $devops_home/config.ru -e $env -d -p $port -t 600 -u $user --pid $pid_file --log $log_file start"
+	  return $?
+	}
+	stop() {
+	  echo "Stopping devops service"
+	  su - $user -c "cd $devops_home && bundle exec thin --pid $pid_file stop"
+	}
+	status() {
+	  if [ -f $pid_file ]; then
+	    pid=`cat $pid_file`
+	    echo "Running with pid: $pid"
+	  else
+	    echo "Not running"
+	  fi
+	  return $?
+	}
+	case "$1" in
+	  start)
+	    start
+	    ;;
+	  stop)
+	    stop
+	    ;;
+	  restart)
+	    stop
+	    start
+	    ;;
+	  status)
+	    status
+	    ;;
+	  *)
+	    echo "Usage: $0 (start|stop|restart|status)"
+	    exit 1
+	esac
+	exit $?
+
+<h2 id="run">Run devops</h2>
+
+Before run devops, check or disable iptables
+
+	chmod +x /etc/init.d/devops_service
+	/etc/init.d/devops_service start
diff --git a/devops-service/providers/openstack.rb b/devops-service/providers/openstack.rb
index f1043ac..fabdc9b 100644
--- a/devops-service/providers/openstack.rb
+++ b/devops-service/providers/openstack.rb
@@ -125,13 +125,20 @@ puts list[0].inspect
             else
               out << "\nERROR: Bad request (400): #{response['badRequest']['message']}"
             end
+            out << "\n"
             return false
           else
             out << "\nERROR: Unknown server error (#{response['badRequest']['code']}): #{response['badRequest']['message']}"
+            out << "\n"
             return false
           end
+        rescue Excon::Errors::InternalServerError => ise
+          out << "\nError: openstack internal server error " + ise.message
+          out << "\n"
+          return false
         rescue => e2
-          out << "Error: Unknown error: " + e.message
+          out << "\nError: Unknown error: " + e2.message
+          out << "\n"
           return false
         end
         sbody = o_server.body