Raspberry Pi Configuration
We have built a Sherig-in-a-Box solution using a Raspberry Pi (model B).
Main features:
Uses standard Whizzy distribution
Additional software: nginx, kiwix, ka-lite, udhcpd
Wireless USB dongle is a based on an RT5370 chip (can run in AP mode)
Doubles as a wireless router (10.0.1.xx); Ethernet port expected to use a DHCP server.
As configured, access to offline Wikipedia is done by pointing the browser to http://wiki.local. To access the offline version of Khan Academy, users point their browser to http://khan.local. Nginx will forward requests to the appropriate servers. Direct access is also available using respective port numbers (e.g., 10.0.0.1:8008), but this is less user-friendly.
Other incorporated changes include: using zram, disabling default swapping mechanisms, optimizations for extending the lifetime of the SD card, and many more.
Configuration files
We have been asked to share our config files and share them below in the hope the following list will be of help. This list is by no means exhaustive.
/etc/init.d/hostapd
...
DAEMON_CONF=/etc/hostapd/hostapd.conf
...
/etc/hostapd/hostapd.conf
interface=wlan0
driver=nl80211
ssid=YourSSID
hw_mode=g
wpa=1
wpa_passphrase=mysecretpassword
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
channel=1
/etc/nginx/sites-available/default
server {
server_name khan.local;
location / {
proxy_pass http://localhost:8008;
proxy_buffering off;
proxy_cache off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Connection '';
proxy_http_version 1.1;
chunked_transfer_encoding off;
}
}
server {
server_name wiki.local;
location / {
proxy_pass http://localhost:8888;
proxy_set_header X-Real-IP $remote_addr;
}
}
server {
listen 80 default_server;
server_name _;
location / {
root /usr/share/nginx/www;
}
}
error_page 404 = /;
/etc/udhcpd.conf
start 10.0.0.20
end 10.0.0.50
interface wlan0
opt dns 8.8.8.8 4.2.2.2
option subnet 255.255.255.0
opt router 10.0.0.1
opt wins 192.168.10.10
option domain local
option lease 864000 # 10 days of seconds
/etc/iptables.ipv4.nat
*filter
:INPUT ACCEPT [186:19057]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [160:40340]
-A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i wlan0 -o eth0 -j ACCEPT
COMMIT
*nat
:PREROUTING ACCEPT [123:13642]
:INPUT ACCEPT [22:1470]
:OUTPUT ACCEPT [7:612]
:POSTROUTING ACCEPT [1:156]
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT
/etc/network/interfaces
auto lo
iface lo inet loopback
iface eth0 inet dhcp
up iptables-restore < /etc/iptables.ipv4.nat
iface wlan0 inet static
address 10.0.0.1
netmask 255.255.255.0
iface default inet dhcp
