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• GentooRTMin

Minimum Setup for Gentoo Real Time system

This setup can be extended to following systems;

• Standalone system
• Boot server for PXE network boot for HDD less front-end PCs
• Real-time network computers like NDS, DAQ servers

setup front-end 12/15/2010 at 40m

Make a full copy of Alex HDD

1. Obtain Alex HDD

2. Do not forget to make a copy of the original HDD. Obtain Knoppix and type

   dd_rescue /dev/sda /dev/sdb

Boot

1. Prepare following equipment;
   • PC for frontend (which has at least one PCIe slot, for example SUPER MICRO)
   • At least one GS ADC card
   • IO chassis (or put ADC into PC's PCIe slot directry)
   • Timing signal
     • Timing signal can be replaced by a function generator with 65536Hz, 5Vpp and 2.5V offset.
     • This timing signal has to be injected into the ADC card somehow.
   • Network router for private network.
2. Connect all, and boot from Alex HD
3. Login as root with CDS password, and set a password for controls.

4. change controls UID to 1001, and controls GID to 1001 because all of the CDS files owned by controls account with UID=1001 and GID=1001. see https://awiki.ligo-wa.caltech.edu/aLIGO/CdsUbuntuDesktopBuild

5. Delete existing IP on /etc/hosts, and add new IP and host name like

   131.215.113.100       standalone
   131.215.113.110       desktop1

6. Setting up network info. like IP or netmask etc at /etc/conf.d/net if you need.

If you need to PXE boot other HDD less PSs through network

1. modify /etc/dhcp/dhcpd.conf to delete existing front-end and add new front-end PCs

2. run dhcpd if not running as

   # /etc/init.d/dhcpd start

   or add dhcpd as default run level as

   # rc-update add dhcpd default

   and reboot.

3. Boot up the TFTP server of master

   # /etc/init.d/in.tftpd start

   or add TFTP server as default run level

   # rc-update add in.tftpd default

   and reboot.

Trouble shooting

tftp can not be accessible from HDD less PC

cd /etc
grep -r diskless *
more /etc/conf.d/in.tftpd 

Start TFTP server

# /etc/init.d/in.tftpd start

If you need to start TFTP server automatically, add TFTP server as default run level

# rc-update add in.tftpd default

How to stop TFTP server from service

# rc-update del in.tftpd default

X windows cannot open through ssh

Delete registered hosts from .ssh/known_hosts

or try

ssh -Y hostname

emerge does not work

# emerge --sync