## page was renamed from LCGT/subgroup/ifo/digital/RTPC/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.
 1. Connect all, and boot from Alex HD
 1. Login as root with CDS password, and set a password for controls.
 1. 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]]
 1. Delete existing IP on /etc/hosts, and add new IP and host name like {{{
131.215.113.100       standalone
131.215.113.110	      desktop1
}}}
 * 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
 1. 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.

 1. 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
}}}