StackScript to install the LAMP stack plus phusion passenger on apache2 and rvm defaulting to ruby 2.0.0 and rails 4

Functions

#!/bin/bash
# StackScript: 8644

##############################################################
# Generic functions
##############################################################

function system_update {
  yum -y update
}

function install_basics {
  yum -y install jwhois rsync openssh-clients wget
}

function postfix_install_loopback_only {
	# Installs postfix and configure to listen only on the local interface. Also
	# allows for local mail delivery

	yum -y install postfix
	yum -y remove sendmail

	touch /tmp/restart-postfix
}

function goodstuff {
	yum -y install vim-enhanced git
}

function restartServices {
	# restarts services that have a file in /tmp/needs-restart/

	for service in $(ls /tmp/restart-* | cut -d- -f2); do
		/etc/init.d/$service restart
		rm -f /tmp/restart-$service
	done
}

##############################################################
# MySQL functions
##############################################################

function mysql_install {
	# $1 - the mysql root password

	if [ ! -n "$1" ]; then
		echo "mysql_install() requires the root pass as its first argument"
		return 1;
	fi

	yum -y install mysql-server

	/etc/init.d/mysqld start
	echo "Sleeping while MySQL starts up for the first time..."
	sleep 20
	#Remove anonymous users
	echo "DELETE FROM mysql.user WHERE User='';" | mysql -u root 
	#Remove remote root
	echo "DELETE FROM mysql.user WHERE User='root' AND Host!='localhost';" | mysql -u root 
	#Remove test db
	echo "DROP DATABASE test;" | mysql -u root 
	#Set root password
	echo "UPDATE mysql.user SET Password=PASSWORD('$1') WHERE User='root';" | mysql -u root 
	#Flush privs
	echo "FLUSH PRIVILEGES;" | mysql -u root 

}

function mysql_tune {
	# Tunes MySQL's memory usage to utilize the percentage of memory you specify, defaulting to 40%

	# $1 - the percent of system memory to allocate towards MySQL

	if [ ! -n "$1" ];
		then PERCENT=40
		else PERCENT="$1"
	fi

	MEM=$(get_physical_memory)
	MYMEM=$((MEM*PERCENT/100)) # how much memory we'd like to tune mysql with
	MYMEMCHUNKS=$((MYMEM/4)) # how many 4MB chunks we have to play with

	# mysql config options we want to set to the percentages in the second list, respectively
	OPTLIST=(key_buffer sort_buffer_size read_buffer_size read_rnd_buffer_size myisam_sort_buffer_size query_cache_size)
	DISTLIST=(75 1 1 1 5 15)

	for opt in ${OPTLIST[@]}; do
		sed -i -e "/\[mysqld\]/,/\[.*\]/s/^$opt/#$opt/" /etc/my.cnf
	done

	for i in ${!OPTLIST[*]}; do
		val=$(echo | awk "{print int((${DISTLIST[$i]} * $MYMEMCHUNKS/100))*4}")
		if [ $val -lt 4 ]
			then val=4
		fi
		config="${config}\n${OPTLIST[$i]} = ${val}M"
	done

	sed -i -e "s/\(\[mysqld\]\)/\1\n$config\n/" /etc/my.cnf

	touch /tmp/restart-mysqld
}

function mysql_create_database {
	# $1 - the mysql root password
	# $2 - the db name to create

	if [ ! -n "$1" ]; then
		echo "mysql_create_database() requires the root pass as its first argument"
		return 1;
	fi
	if [ ! -n "$2" ]; then
		echo "mysql_create_database() requires the name of the database as the second argument"
		return 1;
	fi

	echo "CREATE DATABASE $2;" | mysql -u root -p"$1"
}

function mysql_create_user {
	# $1 - the mysql root password
	# $2 - the user to create
	# $3 - their password

	if [ ! -n "$1" ]; then
		echo "mysql_create_user() requires the root pass as its first argument"
		return 1;
	fi
	if [ ! -n "$2" ]; then
		echo "mysql_create_user() requires username as the second argument"
		return 1;
	fi
	if [ ! -n "$3" ]; then
		echo "mysql_create_user() requires a password as the third argument"
		return 1;
	fi

	echo "CREATE USER '$2'@'localhost' IDENTIFIED BY '$3';" | mysql -u root -p"$1"
}

function mysql_grant_user {
	# $1 - the mysql root password
	# $2 - the user to bestow privileges 
	# $3 - the database

	if [ ! -n "$1" ]; then
		echo "mysql_create_user() requires the root pass as its first argument"
		return 1;
	fi
	if [ ! -n "$2" ]; then
		echo "mysql_create_user() requires username as the second argument"
		return 1;
	fi
	if [ ! -n "$3" ]; then
		echo "mysql_create_user() requires a database as the third argument"
		return 1;
	fi

	echo "GRANT ALL PRIVILEGES ON $3.* TO '$2'@'localhost';" | mysql -u root -p"$1"
	echo "FLUSH PRIVILEGES;" | mysql -u root -p"$1"

}

##############################################################
# PHP functions
##############################################################

function php_install_with_apache {
	install_testing_repo
	yum -y install php php-mysql php-cli mod_php php-cli php-gd
	touch /tmp/restart-httpd
}

function php_tune {
	# Tunes PHP to utilize up to nMB per process, 32 by default
	if [ ! -n "$1" ];
		then MEM="32"
		else MEM="${1}"
	fi

	sed -i'-orig' "s/memory_limit = [0-9]\+M/memory_limit = ${MEM}M/" /etc/php.ini
	touch /tmp/restart-httpd
}

##############################################################
# Apache functions
##############################################################

function apache_install {
	# installs the system default apache2 MPM
	yum -y install httpd

	sed -i -e 's/^#NameVirtualHost \*:80$/NameVirtualHost *:80/' /etc/httpd/conf/httpd.conf

  mkdir -p /etc/httpd/{sites-enabled,sites-available}

  echo "
  Include sites-enabled/*" >> /etc/httpd/conf/httpd.conf

  mv /var/www/html /var/www/public

  if [ ! -n "$1" ]; then
    sed -i "s/root@localhost/$1/g" /etc/httpd/conf/httpd.conf
  fi

  sed -i "s/\/var\/www\/html/\/var\/www\/public/g" /etc/httpd/conf/httpd.conf

	touch /tmp/restart-httpd

  echo "#!/bin/bash
    # Configures a VirtualHost

    # \$1 - required - the hostname of the virtualhost to create 

    if [ ! -n \"\$1\" ]; then
      echo \"apache_virtualhost() requires the hostname as the first argument\"
      return 1;
    fi

    if [ -e \"/etc/httpd/sites-enabled/\${1}\" ]; then
      echo /etc/httpd/sites-enabled/\${1} already exists
      return;
    fi

    mkdir -p /var/www/\$1/htdocs /var/log/httpd/\$1

    echo \"<VirtualHost *:80>\" > /etc/httpd/sites-available/\${1}
    echo \"  ServerName \$1\" >> /etc/httpd/sites-available/\${1}
    echo \"  DocumentRoot /var/www/\$1/htdocs/\" >> /etc/httpd/sites-available/\${1}
    echo \"  <Directory /var/www/\$1/htdocs/>\" >> /etc/httpd/sites-available/\${1}
    echo \"    AllowOverride All\" >> /etc/httpd/sites-available/\${1}
    echo \"  </Directory>\" >> /etc/httpd/sites-available/\${1}
    echo \"  ErrorLog /var/log/httpd/\$1/error.log\" >> /etc/httpd/sites-available/\${1}
    echo \"  CustomLog /var/log/httpd/\$1/access.log combined\" >> /etc/httpd/sites-available/\${1}
    echo \"</VirtualHost>\" >> /etc/httpd/sites-available/\${1}

    ln -s /etc/httpd/sites-available/\${1} /etc/httpd/sites-enabled/\${1}
    ln -s /var/log/httpd/\$1 /var/www/\$1/logs

    touch /tmp/restart-httpd" > /usr/local/bin/apache_virtualhost

  chmod a+x /usr/local/bin/apache_virtualhost
}

function apache_tune {
	# Tunes Apache's memory to use the percentage of RAM you specify, defaulting to 40%

	# $1 - the percent of system memory to allocate towards Apache

	if [ ! -n "$1" ];
		then PERCENT=40
		else PERCENT="$1"
	fi

	yum -y install httpd
	PERPROCMEM=10 # the amount of memory in MB each apache process is likely to utilize
	MEM=$(get_physical_memory)
	MAXCLIENTS=$((MEM*PERCENT/100/PERPROCMEM)) # calculate MaxClients
	MAXCLIENTS=${MAXCLIENTS/.*} # cast to an integer
	sed -i -e "s/\(^[ \t]*\(MaxClients\|ServerLimit\)[ \t]*\)[0-9]*/\1$MAXCLIENTS/" /etc/httpd/conf/httpd.conf

	touch /tmp/restart-httpd
}

function apache_virtualhost_from_rdns {
	# Configures a VirtualHost using the rdns of the first IP as the ServerName

	apache_virtualhost $(get_rdns_primary_ip)
}

##############################################################
# Ruby functions
##############################################################

function rvm_install {
  if [ ! -n "$1" ];
    then RUBYVERSION=2.0.0
    else RUBYVERSION="$1"
  fi

  curl https://raw.githubusercontent.com/wayneeseguin/rvm/master/binscripts/rvm-installer | bash -s stable
  source /etc/profile
  rvm requirements

  rvm install "$RUBYVERSION"
  rvm use "$RUBYVERSION" --default
}

function passenger_install {
  gem install passenger

  yum -y install curl-devel httpd-devel

  passenger-install-apache2-module --auto

  PATH=`gem environment gemdir`

  echo "LoadModule passenger_module $PATH/gems/passenger-4.0.41/buildout/apache2/mod_passenger.so
   <IfModule mod_passenger.c>
     PassengerRoot $PATH/gems/passenger-4.0.41
     PassengerDefaultRuby $PATH/wrappers/ruby
   </IfModule>" > /etc/httpd/conf.d/passenger.conf
}

##############################################################
# Utility functions
##############################################################

function system_primary_ip {
  # returns the primary IP assigned to eth0
  echo $(ifconfig eth0 | awk -F: '/inet addr:/ {print $2}' | awk '{ print $1 }')
}

function get_rdns {
  # calls host on an IP address and returns its reverse dns
  if [ ! -e /usr/bin/host ]; then
   yum -y install bind-utils > /dev/null
  fi
  echo $(host $1 | awk '/pointer/ {print $5}' | sed 's/\.$//')
}

function get_rdns_primary_ip {
  # returns the reverse dns of the primary IP assigned to this system
  echo $(get_rdns $(system_primary_ip))
}

LAMP+RVM+PASSENGER - StackScript

#!/bin/bash

source <ssinclude StackScriptID="8644">

# <UDF name="db_password" Label="MySQL root Password" />
# <UDF name="db_name" Label="Create Database" default="" example="Optionally create this database" />
# <UDF name="db_user" Label="Create MySQL User" default="" example="Optionally create this user" />
# <UDF name="db_user_password" Label="MySQL User's Password" default="" example="User's password" />
# <UDF name="apache_server_admin" Label="Apache Server Admin Email" example="Server Admin Email" />

logfile="/root/log.txt"

export logfile

system_update >> $logfile
install_basics >> $logfile
echo "System Updated" >> $logfile
postfix_install_loopback_only >> $logfile
echo "postfix_install_loopback_only" >> $logfile
mysql_install "$DB_PASSWORD" >> $logfile
mysql_tune 40 >> $logfile
echo "Mysql installed" >> $logfile
mysql_create_database "$DB_PASSWORD" "$DB_NAME" >> $logfile
mysql_create_user "$DB_PASSWORD" "$DB_USER" "$DB_USER_PASSWORD" >> $logfile
mysql_grant_user "$DB_PASSWORD" "$DB_USER" "$DB_NAME" >> $logfile

php_install_with_apache >> $logfile
php_tune >> $logfile
echo "Php installed" >> $logfile

apache_install "$APACHE_SERVER_ADMIN" >> $logfile
apache_tune 40  >> $logfile
apache_virtualhost_from_rdns >> $logfile
apache_mod_deflate_config >> $logfile
echo "apache installed" >> $logfile
goodstuff >> $logfile
echo "goodstuff installed" >> $logfile

#installing ruby
rvm_install >> $logfile
echo "Installed rvm" >> $logfile

gem install rails >> $logfile
echo "Installed rails" >> $logfile

passenger_install >> $logfile
echo "Built apache2 passenger module" >> $logfile

restartServices >> $logfile
echo "StackScript Finished!" >> $logfile