Config/Profile files for Raspberry Pi

Description

My personal config/profile files for Raspberry Pi server, currently running on Raspbian.

0. For My Comfort

A. use prep script

$ cd ~
$ wget -O - "https://raw.github.com/meinside/rpi-configs/master/bin/prep.sh" | bash

1. Useful Configurations

A. Setting up watchdog

$ sudo modprobe bcm2708_wdog

$ sudo vi /etc/modules

# Add following line:
bcm2708_wdog

$ sudo apt-get install watchdog

$ sudo chkconfig watchdog on

$ sudo /etc/init.d/watchdog start

$ sudo vi /etc/watchdog.conf

# Uncomment line:

watchdog-device = /dev/watchdog

B. Setting up i2c

$ sudo modprobe i2c_dev

$ sudo vi /etc/modules

# Add following line:

i2c-dev

$ sudo vi /etc/modprobe.d/raspi-blacklist.conf

# Comment out following lines:

blacklist spi-bcm2708
blacklist i2c-bcm2708

$ sudo apt-get install i2c-tools

$ sudo usermod -a -G i2c USERNAME

2. Additional Configurations

A. Install RVM for multi-users

$ curl -L get.rvm.io | sudo bash -s stable

$ sudo /usr/sbin/usermod -a -G rvm USERNAME

$ sudo chown root.rvm /etc/profile.d/rvm.sh

B. WiFi Configuration

$ sudo vi /etc/wpa_supplicant/wpa_supplicant.conf

# (add following)

network={
    ssid="[some_ssid]"
    psk="[some_passwd]"

    # Protocol type can be: RSN (for WP2) and WPA (for WPA1)
    proto=RSN

    # Key management type can be: WPA-PSK or WPA-EAP (Pre-Shared or Enterprise)
    key_mgmt=WPA-PSK

    # Pairwise can be CCMP or TKIP (for WPA2 or WPA1)
    pairwise=CCMP

    #Authorization option should be OPEN for both WPA1/WPA2 (in less commonly used are SHARED and LEAP)
    auth_alg=OPEN

	# Uncomment below line for private network (i.e. no broadcast SSID)
#	scan_ssid=1
}

$ sudo ifup wlan0

C. UTF-8 configuration for MySQL

$ sudo vi /etc/mysql/my.cnf

# (add following)

[mysql]
default-character-set = utf8
 
[client]
default-character-set = utf8
 
[mysqld]
character-set-client-handshake=FALSE
init_connect="SET collation_connection = utf8_general_ci"
init_connect="SET NAMES utf8"
character-set-server = utf8
collation-server = utf8_general_ci
 
[mysqldump]
default-character-set = utf8

D. Rails: Passenger configurations

see: https://github.com/meinside/rails-on-raspberrypi#install-passenger-module

E. AFP & Zero-conf DNS configuration

a. install netatalk and avahi-daemon

$ sudo apt-get install netatalk

$ sudo apt-get install avahi-daemon

b. install dnssd module for apache2

$ sudo apt-get install libapache2-mod-dnssd

$ sudo a2enmod mod-dnssd

c. add an avahi-daemon service

$ sudo vi /etc/avahi/services/SERVICE_NAME.service

# (create a new file with following content)

<?xml version="1.0" standalone='no'?><!--*-nxml-*-->
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
    <name replace-wildcards="yes">%h</name>
    <service>
        <type>_afpovertcp._tcp</type>
        <port>548</port>
    </service>
    <service>
        <type>_http._tcp</type>
        <port>80</port>
    </service>
    <service>
        <type>_ssh._tcp</type>
        <port>22</port>
    </service>
    <service>
        <type>_device-info._tcp</type>
        <port>0</port>
        <txt-record>model=Xserve</txt-record>
    </service>
</service-group>

3. Etc. Tips

A. set static dns server even when using DHCP

$ sudo vi /etc/dhcp/dhclient.conf

# add following:
supersede domain-name-servers 8.8.8.8, 8.8.4.4;

B. when using bluetooth

1. with on-board bluetooth (Raspberry Pi 3)

a. install required packages

$ sudo apt-get install pi-bluetooth

and reboot.

b. use bluetoothctl

After reboot, use bluetoothctl for turning up, scanning, and connecting.

$ sudo bluetoothctl

Type help for commands and options.

2. with dongle

referenced: http://wiki.debian.org/BluetoothUser

a. make raspberry pi discoverable by other bluetooth devices

$ sudo hciconfig hci0 piscan

$ sudo bluetooth-agent 0000

do something here, and make raspberry pi hidden from other bluetooth devices again

$ sudo hciconfig hci0 noscan

b. display bluetooth device (for checking proper installation)

$ hcitool dev

c. scan nearby bluetooth devices

$ hcitool scan

d. settings

$ sudo vi /etc/default/bluetooth

# edit
#HID2HCI_ENABLED=0
HID2HCI_ENABLED=1

# add static device informations
device 01:23:45:AB:CD:EF {
    name "Bluetooth Device Name";
    auth enable;
    encrypt enable;
}

C. use logrotate.d

$ sudo vi /etc/logrotate.d/some_file

    /some_where/*.log {
      compress
      copytruncate
      daily
      delaycompress
      missingok
      rotate 7
      size=5M
    }

D. mount external hdd on boot time

$ sudo vi /etc/fstab

# add following (uid and gid can be retrieved with command 'id')
/dev/some_hdd1  /some/where/to/mount1  ext4  defaults   0 0
/dev/some_hdd2  /some/where/to/mount2  vfat  rw,noatime,uid=7777,gid=7778,user   0 0

E. run scripts periodically

$ crontab -e

# every 5 minutes
*/1 * * * * bash -l /some/script_that_needs_login.sh
# every 1 hour
0 1 * * * bash -l -c /some/ruby_script_under_rvm.rb

F. Problem: 'smsc95xx 1-1.1:1.0: eth0: kevent 2 may have been dropped'

append 'smsc95xx.turbo_mode=N' to /boot/cmdline.txt
add(edit) following in /etc/sysctl.conf

#vm.vfs_cache_pressure = 100
vm.vfs_cache_pressure = 300
#vm.min_free_kbytes=8192
vm.min_free_kbytes=32768

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