NEXS installation procedure
Contents
NEXS Installation Procedure
This is the procedure to install a schoolserver from a usb drive.
Requirements
You will need a server which can boot a usb-drive. Turn on the server and enter the BIOS. Check the boot
priorities. Set usb hard drive as the first boot priority (ahead of the hard drive). If the server cannot boot from a usb drive, you will have to use a cd. The server must have two NICs (Network Interface Cards). Modern servers have one on the motherboard which provides an ethernet port in the motherboard io section. The second NIC is normally a PCI card which provides a second ethernet port. The motherboard port is known to the system as eth0 and is used to connect to the WAN (internet provider). The PCI port is known to the system as eth1 and is used to connect to the XOs via wifi. It is also known as the LAN connection. The server normally will not have a monitor, keyboard, or mouse (this is known as a 'headless' server since administration is performed by remote login over the network - in this case, via the LAN using an XO.
Access Point
Set up the Access Point. This is done by resetting it (hold in the reset switch for a long time and then another long
time (they usually have a long delay to prevent accidental resets). Then remove the power for a few seconds and restart. This reboots the AP so that it sees the changed settings. You can then access the AP via the XO. Start a web browser (Browse or Firefox (E-Paath). Enter web address: http://192.168.1.254 or, whatever the manufacturer gives as the default address. You should see a setup form for the AP. Ignore the LAN side for now. Setup the WAN (wireless) side to use IP address: 172.18.0.3 with mask 255.255.254.0. Enable DHCP with a limited range: 172.18.0.80 to 172.18.0.90, for example. Save the changes. You should now be able to ping the AP (terminal: ping 172.18.0.3). Set the network to broadcast 'schoolnet' as the SSID.
Install NEXS
Install NEXS on the server. Insert the USB drive and start the server (if using a CD, insert the CD). The server will take
about 20 minutes to complete the install. When it is done, the server will power off.
Restart
Restart the server. Before doing so, you need to remove the USB drive (or CD). If you do not, the system will reboot from the
USB drive (or CD). If you are using a CD, the CD tray should be open. Take out the CD. When the system restarts, close the tray. If the tray is not open, restart the system, open the tray, and remove the CD. Hit the reset button to restart the servers since it may have detected the CD and be trying to boot from CD.
Complete Network Configuration
The reboot may take two or three minutes. When you think it is done, login to the server from the XO. In a terminal window, enter
ssh admin@schoolserver. If the XO gives an error, try going to the /home/olpc/.ssh directory. Remove known_hosts. Retry ssh admin@schoolserver. It will ask if you really want to do this, answer yes. Now enter the command: su ./netsetup with the following four parameters: school server nameserver netmask. If the netmask parameter is 255.255.255.0, it may be omitted. If the nameserver is in the same network as the server, the parameter may be omitted (e.g. server is 192.168.2.77 and the nameserver is 192.168.2.1, then the parameter is unneeded). The school parameter is a short name for the school, e.g. kavre. The server parameter is it's network address (e.g. 192.168.2.77). You will have been given these parameters before you started the install. When the script is complete, it will say: "done". At this point, logout.
Reconfigure Access Point
Use the XO browser to access the AP: http://172.18.0.3. Change the LAN (wireless) side so that the network is open and does not provide
DHCP service.
Test server installation
a. Look at the neighborhood view. You should see a circle with the designation: schoolnet. The XO should be connected
(shown as to semicircles outside the circle).
b. From the XO, ping the schoolserver (172.18.0.1). If that succeeds, ping the schoolserver (ping schoolserver). If that succeeds,
ping the schoolserver (192.168.2.77). If that suceeds, ping the nameserver (ping 192.168.2.1). If that suceeds, ping Google
(ping www.google.com).
c. From a browser: access Google. Do a search (e.g. OLPC). Access wiki.laptop.com.
d. From a browser: access the schoolserver (http://schoolserver). You should see the school's Moodle page.
Test the 'mesh' connection
a. Register the XO. If the XO does not show the registration option (along with restart, shutdown), then you need to use a
terminal window. Go to /home/olpc/.sugar/default. Use nano (sudo nano config) to edit the file: config.
Delete (ctl + k) the two lines:
[Server]
backup1
Enter ctl + x to exit nano (answer y to save the change). Now reboot the XO and you should see the register option.
b. In a terminal window enter: olpc-netstatus You should see under telepathy the word "gabble". This means the XO is using the
AP for it's mesh (XO-XO) connections.
c. Start a second XO. The two XO's should see each other in the neighborhood view. Start Chat on each XO. You should be able to
see each other in the chat room and type messages between the two XOs.
Exceptions and Notes
1. At the moment, the install CD requires you to enter return on the keyboard to start the install. This WILL be removed.
2. At the moment, the system will automatically reboot when the install is completed. You must watch for this and remove the
usb drive or CD immediately (for the CD, it is enough to open the tray). Then reset to restart the boot process. This too WILL be fixed.
3. Since 192.168.5.44 is in use by an unknown system, use the parameters for netsetup: sanepa 192.168.5.45 192.168.5.1 255.255.255.0
4. The netsetup script will be on the USB drive for now (This too WILL be fixed). So in step 5, when you login by ssh, you will need to
mount the USB drive. Wait until the screen shows several lines (system is mounting the drive). You can then execute the script by the command: /media/usb0/netsetup.
