DEAP
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Links
- https://deap06.triumf.ca/ MIDAS status page
- https://deap06.triumf.ca/elog/ ELOG
DAQ machines
- deap00: main daq machine (storage, home directories, central services, etc)
- deap01..05: A3818 daq machines
- deap06.triumf.ca: temporary network gateway
- lxdeap01: VME daq machine
- deapvme01..03: VME crate power supplies
Network configuration (TRIUMF)
DEAP DAQ machines are on the private network 192.168.1.x (netmask 255.255.255.0)
Gateway to TRIUMF network is 1U machine deap06.triumf.ca connected to the LADD-NIS cluster (deap account on ladd00).
Gateway services running on the gateway:
- DHCP server for the 192.168.1.x network (/etc/hosts, /etc/dhcp/dhcpd.conf)
- apache SSL/https proxy for MIDAS status page, ELOG, ganglia and nodeinfo (/etc/httpd/conf.d/ssl.conf)
- NAT proxy from private network to the TRIUMF network (/etc/rc.local). Makes the internet accessible from deapNN machines.
Network configuration (DEAP)
The DEAP DAQ cluster is configured for standalone running with or without an internet connection.
(NB: Some internet functions are required: access to NTP for time synchronization and access to Linux package repositories to install packages, etc)
Usernames, passwords and hostnames are distributed using NIS:
- domain name: DEAP-NIS
- deap00 is the master server
- there are no secondary servers
- hostnames are distributed using NIS (from deap00:/etc/hosts, MUST MATCH deap06:/etc/hosts!)
- to solve chicken-and-egg problem deap00 IP address has to be listed in each machine /etc/hosts (MUST MATCH deap06 and deap00 /etc/hosts!) (SL6.2+ NIS broadcast does not work so deap00 has to be listed in each machine /etc/yp.conf, also NFS filesystems are mounted before NIS is started).
- also NIS has to be listed in front of DNS in the "hosts:" entry of /etc/nsswitch.conf
DNS kludge:
- normally DNS would be used to distribute IP addresses and hostnames to the DHCP server, to deap00 and to other deap machines. But we do not have a private DNS server and the TRIUMF DNS server has the wrong IP addresses for deap machines (142.90.x.x).
- deap06 DHCP is telling all machines to use the TRIUMF DNS server (to resolve internet addresses - google, etc). To avoid confusion between local deap00, etc hostnames and deap00, etc hostnames from TRIUMF, /etc/nsswitch.conf "hosts:" entry has to list "nis" before "dns".
- hopefully the deap00, etc hostnames will be resolved correctly by the SNOlab DNS servers and all this kludging can go away.