Exadata -- Changing DNS Server

Changing the DNS of Exadata means actually changing the DNS of Db nodes, Cell nodes, IB switches and Ethernet switches.
We follow step to accomplish these;

• Logon to infiniband switches one by one and make the changes in /etc/resolv.conf.. Open /etc/resolv.cof in vi editor, and change the desired dns server or append a line for your new dns server..

Note that : The resolv.conf file is the resolver configuration file. It is use to configure client side access to the Internet Domain Name System (DNS).

• Logon to Db nodes one by one and make the changes in /etc/resolv.conf..pen /etc/resolv.cof in vi editor, and change the desired dns server or append a line for your new dns server..

• Logon to one of the Cell nodes, and execute ipconf to change the DNS of Cell Server and ILOM.. In the example above, we add a new dns server(192.168.120.202) to Exadata.. Note that , Exadata in the Example, has already a dns server (192.168.120.205).

[root@dm01cel01 oracle.cellos]# /opt/oracle.cellos/ipconf

Logging started to /var/log/cellos/ipconf.log

Interface ib0 is Linked. hca: mlx4_0

Interface ib1 is Linked. hca: mlx4_0

Interface eth0 is Linked. driver/mac: igb/00:21:28:8e:b2:98

Interface eth1 is ... Unlinked. driver/mac: igb/00:21:28:8e:b2:99

Interface eth2 is ... Unlinked. driver/mac: igb/00:21:28:8e:b2:9a

Interface eth3 is ... Unlinked. driver/mac: igb/00:21:28:8e:b2:9b

Network interfaces

Name State IP address Netmask Gateway Net type Hostname

ib0 Linked

ib1 Linked

eth0 Linked

eth1 Unlinked

eth2 Unlinked

eth3 Unlinked

Warning. Some network interface(s) are disconnected. Check cables and swicthes and retry

Do you want to retry (y/n) [y]: n

The current nameserver(s): 192.168.120.205

Do you want to change it (y/n) [n]: y

Nameserver: 192.168.120.205

Add more nameservers (y/n) [n]: y

Nameserver: 192.168.120.202

Add more nameservers (y/n) [n]: n

The current timezone: Europe/Istanbul

Do you want to change it (y/n) [n]: n

The current NTP server(s): 192.168.120.1

Do you want to change it (y/n) [n]: n

Network interfaces

Name State IP address Netmask Gateway Net type Hostname

eth0 Linked 128.10.154.4 255.255.255.0 128.10.154.1 Management dm01cel01.erman.local

eth1 Unlinked

eth2 Unlinked

eth3 Unlinked

bondib0 ib0,ib1 192.168.154.4 255.255.255.0 Private dm01cel01-priv.erman.local

Select interface name to configure or press Enter to continue:

Select canonical hostname from the list below

1: dm01cel01.erman.local

2: dm01cel01-erman.local

Canonical fully qualified domain name [1]:

Select default gateway interface from the list below

1: eth0

Default gateway interface [1]:

Canonical hostname: dm01cel01.erman.local

Nameservers: 192.168.120.205 192.168.120.202

Timezone: Europe/Istanbul

NTP servers: 192.168.120.1

Default gateway device: eth0

Network interfaces

Name State IP address Netmask Gateway Net type Hostname

eth0 Linked 128.10.154.4 255.255.255.0 128.10.154.1 Management dm01cel01.erman.local

eth1 Unlinked

eth2 Unlinked

eth3 Unlinked

bondib0 ib0,ib1 192.168.154.4 255.255.255.0 Private dm01cel01-priv.erman.local

Is this correct (y/n) [y]:

Do you want to configure basic ILOM settings (y/n) [y]:

Loading basic configuration settings from ILOM ...

ILOM Fully qualified hostname [dm01cel01-ilom.erman.local]:

ILOM IP discovery (static/dhcp) [static]:

ILOM IP address [128.10.154.9]:

ILOM Netmask [255.255.255.0]:

ILOM Gateway or none [128.10.154.1]:

ILOM Nameserver or none [192.168.120.205]:

ILOM Use NTP Servers (enabled/disabled) [enabled]:

ILOM Use NTP Servers (enabled/disabled) [enabled]:

ILOM First NTP server. Fully qualified hostname or ip address or none [192.168.120.1]:

ILOM Second NTP server. Fully qualified hostname or ip address or none [none]:

Basic ILOM configuration settings:

Hostname : dm01cel01-ilom.erman.local

IP Discovery : static

IP Address : 128.10.154.9

Netmask : 255.255.255.0

Gateway : 128.10.154.1

DNS servers : 192.168.120.205

Use NTP servers : enabled

First NTP server : 192.168.120.1

Second NTP server : none

Timezone (read-only) : Europe/Istanbul

Is this correct (y/n) [y]:

Info. Run /opt/oracle.cellos/validations/init.d/saveconfig

Info. Custom changes have been detected in /etc/resolv.conf

Info. Original file will be saved in /etc/resolv.conf.backupbyExadata

Warning. You modified DNS name server.

Ensure you also update the Infiniband Switch DNS server

if the same DNS server was also used by the Infiniband switch.

• After this operation, restart cell services with the following command;

cellcli -e alter cell restart services all

• Ensure the cell processes are running and their status are ONLINE ...

cellcli -e list cell detail

• Repeate this step one by one for each exadata cell...