Red Hat ENTERPRISE LINUX WS 2.1 - Guia de Instalação descarregar pdf (Página 178)

178 Troubleshooting TopSpin

DONE

INDEX

c) Switch on the acquisition rack after the PC has rebooted

4. Check the nameserver configuration:

a) Type grep hosts /etc/nsswitch.conf

What is the output of this command?

Nothing? No problem, go to step 5.

• Cannot open nsswitch.conf ? No problem, no nameserver; go to step 5.

• hosts: files dns nisplus? No problem, this entry is correct; go to step 5

• hosts dns.... or hosts nisplus....? You found the problem: go to step b.

b) Edit the file /etc/nsswitch.conf and check if the line hosts looks

like this: hosts: files dns nisplus

where files refers to the local /etc/hosts file and dns to the DNS

(bind) and nisplus refer to nameservers.

This specifies that network commands like telnet should first check

the local file /etc/hosts then, if the host was not found, contact the

Domain Name System (dns) and finally the Network Information System

(nisplus). The entries dns and nisplus are only useful if you have the cor-

responding network systems. Make sure the entry files comes first, the ex-

istence and the order of entries nisplus and dns depends on your network.

5. Check the list of PC names in the file /etc/resolv.conf.

Every entry in this file must be correct, otherwise there will be time-outs in net-

work traffic which interfere with the connection to the spectrometer.

6. Check if NFS is running:

a) Type ps -efw| grep nfsd

Does the output of this command show you 8 processes /usr/etc/nfsd ?

YES? Then NFS is running, continue with step 8

NO? Then you found the problem, continue with step c

b) Check the file

• /etc/sysconfig/network

Does the file contain the entry

NETWORKING=yes

YES? Then NFS can be started, continue with step 8

NO? Then you found the problem, change the entry to yes and restart NFS

manually. Open a shell and type in:

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Red Hat ENTERPRISE LINUX WS 2.1 - Guia de Instalação Página 178