HP XC System Software Administration Guide Version 3.2

Other tools (ntpq and ntpdc) are also available. For more information on NTP, see ntpd(1),
ntpdc(1), and ntpq(1).
9.3 Changing the External IP Address of a Head Node
Use the following procedure to change the external IP address of the head node:
NOTE: This procedure requires you to reboot the head node.
1. Edit the /etc/sysconfig/netinfo file as follows:
a. Specify the new head node external IP address in the --ip option of the network
command.
b. Ensure that the MAC address corresponds to the proper Network Interface Card (NIC).
c. Ensure that the PCI bus ID for your HP XC system matches the one specified in the
/opt/hptc/config/platform_vars.ini file. This file is linked to the
/opt/hptc/config/modelmap file.
2. Ensure that the name server specified in the /etc/resolv.conf file is accessible.
If the name server is not accessible, edit the /etc/resolv.conf file to comment out that
line as a temporary measure.
3. If your system has been configured for improved availability, enter the
transfer_from_avail command:
# transfer_from_avail
4. Run the cluster_config utility.
5. Use the shownode command as follows to ensure that the database was updated with the
correct information:
# shownode config nodes `headnode`
6. Reboot the head node.
7. If your system has been configured for improved availability, enter the transfer_to_avail
command:
# transfer_to_avail
9.4 Modifying Sendmail
On HP XC systems, inbound mail from external connections is blocked by the
DaemonPortOptions option of the /etc/mail/sendmail.cf file. If you need to receive mail
from outside the HP XC system, you must modify this option.
When making modifications to sendmail, HP recommends that you do not modify the
/etc/sendmail/sendmail.cf and /etc/sendmail/submit.cf files directly. Rather,
modify the /etc/mail/sendmail.mc and /etc/mail/submit.mc files, and run them
through an M4 processor to create the .cf files.
The M4 processing tools are part of the sendmail-cf RPM (Red Hat Package Manager), which
is not installed by default. This RPM is available on the HP XC distribution DVD in the extra
RPMs directory.
9.3 Changing the External IP Address of a Head Node 133