###Use Minminal Image (https://www.linuxsystems.it/raspbian-wheezy-armhf-raspberry-pi-minimal-image/)

###Steps Below Uses the some the steps from the links belwo to optimize image 
###(http://www.raspberrypi.org/forums/viewtopic.php?f=66&t=61033)
###(https://extremeshok.com/1081/raspberry-pi-raspbian-tuning-optimising-optimizing-for-reduced-memory-usage/)

###Get sudo some images do not have 
apt-get -y install sudo

###First boot
sudo raspi-config    
###1. expand filesystem (can skip this step if extra partitions needed)
###2. Advanced Options -> Memory Split -> give 16MB to GPU
###3. Overclock 800Mhz

####Switch DNS resolve to Google Server (So packages will not update)
sudo apt-get install resolvconf

sudo nano /etc/resolvconf/resolv.conf.d/base
nameserver 8.8.8.8
nameserver 8.8.4.4
###(ctrl-x Save exit)

###Upgrade packages
sudo apt-get update && sudo apt-get -y upgrade && sudo reboot

###Get rpi-update some images do not have 
sudo wget https://raw.github.com/Hexxeh/rpi-update/master/rpi-update -O /usr/bin/rpi-update
sudo chmod +x /usr/bin/rpi-update
sudo apt-get -y install git
sudo apt-get -y install curl
sudo apt-get -y install rpi-update

###Get raspi-config some images do not have 
sudo echo "deb http://archive.raspberrypi.org/debian/ wheezy main" >> /etc/apt/sources.list
sudo wget http://archive.raspberrypi.org/debian/raspberrypi.gpg.key
sudo apt-key add raspberrypi.gpg.key
sudo apt-get update
sudo apt-get -y install raspi-config


###Get lsusb images do not have 
sudo apt-get -y install usbutils

###Upgrade firmware
###Beta: FIQ_FSM USB driver rewrite  (http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=70437)
sudo BRANCH=next rpi-update

###You must also edit cmdline.txt to add the following (fiq_fsm is not enabled by default):
sudo nano /boot/cmdline.txt
dwc_otg.fiq_enable=1 dwc_otg.fiq_fsm_enable=1 dwc_otg.fiq_fsm_mask=0x3
###(ctrl-x Save exit)

###1.  Setup kernel options 
sudo nano /boot/config.txt
###Copy Paste Below at end of File:
arm_freq=800
core_freq=250
sdram_freq=400
over_voltage=6
gpu_mem=1
emmc_pll_core=1
force_turbo=1
init_emmc_clock=500000000
###(ctrl-x Save exit)

###2.  Setup kernel options 
sudo nano /boot/cmdline.txt
elevator=noop
###sets the Network device not in turbo mode. turns off buffering network traffic
smsc95xx.turbo_mode=N
###(ctrl-x Save exit)

####tune system
sudo nano  /etc/sysctl.conf
fs.file-max = 150000
vm.min_free_kbytes = 16384
vm.dirty_background_ratio = 20
vm.dirty_expire_centisecs = 0
vm.dirty_ratio = 80
vm.dirty_writeback_centisecs = 1200
vm.overcommit_ratio = 2
vm.laptop_mode = 5
vm.swappiness = 10
net.ipv4.tcp_timestamps = 0 
net.ipv4.tcp_sack = 1 
net.ipv4.tcp_window_scaling = 1
net.core.rmem_default = 31457280
net.core.rmem_max = 12582912
net.core.wmem_default = 31457280
net.core.wmem_max = 12582912
net.core.somaxconn = 65536
net.core.netdev_max_backlog = 65536
net.core.optmem_max = 25165824
net.ipv4.tcp_mem = 65536 131072 262144
net.ipv4.udp_mem = 65536 131072 262144
net.ipv4.tcp_rmem = 8192 87380 16777216
net.ipv4.udp_rmem_min = 16384
net.ipv4.tcp_wmem = 8192 65536 16777216
net.ipv4.udp_wmem_min = 16384
###(ctrl-x Save exit)

### Set the CPU scaling governor to performance
sudo echo -n performance | sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

###Fix fstab
sudo nano /etc/fstab
###Add noatime to all, mount /var/run and other fast burning partitions to tmpfs (except /var/log)
###Mount /boot in ro mode:
proc            /proc           proc    defaults          0       0
none            /var/run        tmpfs   size=1M,noatime   0       0
none            /tmp            tmpfs   size=1M,noatime   0       0
none            /var/tmp        tmpfs   size=1M,noatime   0       0
/dev/mmcblk0p1  /boot           vfat    noatime           0       2
/dev/mmcblk0p2  /               ext4    defaults,noatime  0       1
###(ctrl-x Save exit)
sudo sed -i 's/defaults,noatime/defaults,noatime,nodiratime/g' /etc/fstab


###Setup fsck
sudo nano /etc/default/rcS
# automatically repair filesystems with inconsistencies during boot
FSCKFIX=yes
###(ctrl-x Save exit)

sudo tune2fs -c 3 /dev/mmcblk0p2

###Replace syslog with inetutils-syslogd
sudo su
sudo apt-get -y remove --purge rsyslog
sudo apt-get -y install inetutils-syslogd
sudo echo -e "*.*;mail.none;cron.none\t -/var/log/messages\ncron.*\t -/var/log/cron\nmail.*\t -/var/log/mail" > /etc/syslog.conf
sudo mkdir -p /etc/logrotate.d
sudo echo -e "/var/log/cron\n/var/log/mail\n/var/log/messages {\n\trotate 4\n\tweekly\n\tmissingok\n\tnotifempty\n\tcompress\n\tsharedscripts\n\tpostrotate\n\t/etc/init.d/inetutils-syslogd reload >/dev/null\n\tendscript\n}" > /etc/logrotate.d/inetutils-syslogd
sudo service inetutils-syslogd start

###Install ramlog
sudo apt-get -y  install lsof 
sudo dpkg -i /boot/ramlog_2.0.0-omv_all.deb

###Edit /etc/init.d/ramlog:
sudo nano /etc/init.d/ramlog
### BEGIN INIT INFO
# Provides: ramlog
# Required-Start:
# X-Start-Before:   inetutils-syslogd
# X-Stop-After:     inetutils-syslogd

sudo insserv

###Disable swapping
sudo dphys-swapfile swapoff && sudo dphys-swapfile uninstall && sudo update-rc.d dphys-swapfile remove

###Disable IP6
echo "net.ipv6.conf.all.disable_ipv6=1" >> /etc/sysctl.d/disableipv6.conf
echo "install ipv6 /bin/true" >> /etc/modprobe.d/blacklist.conf
echo "install ipv6 /bin/true" >> /etc/modprobe.d/raspi-blacklist.conf
sudo sed -i '/::/s%^%#%g' /etc/hosts


###Replacing OpenSSH with Dropbear
sudo apt-get -y install dropbear openssh-client
sudo sed -i 's/NO_START=1/NO_START=0/g' /etc/default/dropbear
sudo /etc/init.d/ssh stop && sudo /etc/init.d/dropbear start
sudo apt-get purge openssh-server	

###Remove the extra tty / getty’s | Save: +3.5 MB RAM
sudo sed -i '/[2-6]:23:respawn:\/sbin\/getty 38400 tty[2-6]/s%^%#%g' /etc/inittab 	
sudo sed -i '/T0:23:respawn:\/sbin\/getty -L ttyAMA0 115200 vt100/s%^%#%g' /etc/inittab

###Use Dash instead of BASH
sudo dpkg-reconfigure dash

###Move/etc/network/interfaces to Symbolic Link (http://rpi.tnet.com/project/faqs/winaccessinterfacesfile)
sudo cd /etc/network
sudo cp interfaces /boot/interfaces
sudo mv interfaces interfaces.save
sudo ln -s /boot/interfaces interfaces

###Setup enable second network interface to have DHCP
sudo nano /etc/network/interfaces
auto lo
iface lo inet loopback

allow-hotplug eth0
iface eth0 inet dhcp

allow-hotplug eth1
iface eth1 inet dhcp
###(ctrl-x Save exit)

###Assign network names based on location so image can boot on different PI
sudo nano /etc/udev/rules.d/70-persistent-net.rules
KERNEL=="eth*", KERNELS=="1-1.1", NAME="eth0"
KERNEL=="eth*", KERNELS=="1-1.[2-3]", NAME="eth1"
###(ctrl-x Save exit)

##Remove NTP from service so it does not interruppt Network
### Another way to disable NTP (http://windycitytech.blogspot.com/2013/03/disable-ntp-sending-out-requests-on.html)
sudo update-rc.d -f ntp remove

###Install gbd for debug purposes
sudo apt-get -y install gdb

###Get killall some images do not have 
sudo apt-get -y install psmisc

###Remove Unwanted services
sudo apt-get -y purge libx11-6 libgtk-3-common xkb-data lxde-icon-theme raspberrypi-artwork penguinspuzzle
sudo apt-get -y autoremove

###Clear cmd history
sudo cat /dev/null > ~/.bash_history && history -c && exit

##Reboot to have all setting take effect
sudo reboot