oracle apps dba blog

There are tedious steps in during a Oracle RAC install–
while configuring user equivalence using ssh…

I will prefer configuring rsh instead of ssh since ssh failed for me
many times even after configuring correctly.

During Clusterware Install oui looks for either ssh or rsh to proceed further..

This is required in RAC Installation since you are installing from the first node to
other node(s).(like remote copy etc).

so best way is to configure rsh instead of ssh .I will discuss further as how to configure rsh

While installing Linux or Operating System choose rsh package and rlogin package
by customising the packages or install the proper rpm for rsh and rlogin using the option rpm -ivh package name

lets assume that rac1,rac2 are the RAC nodes in which RAC needs to be installed then

To enable the “rsh” and “rlogin” services,if its not enabled do the following
as root (do this on all nodes)
# chkconfig rsh on
# chkconfig rlogin on
# service xinetd reload
Reloading configuration: [ OK ]

To allow the “oracle” OS user account to be trusted among the RAC nodes,
create the /etc/hosts.equiv file (on all rac nodes )
# su -
# touch /etc/hosts.equiv
# chmod 600 /etc/hosts.equiv
# chown root.root /etc/hosts.equiv

Now add all RAC nodes to the /etc/hosts.equiv file similar to the following example for all nodes in the cluster:
# cat /etc/hosts.equiv
+rac1 oracle
+rac2 oracle

go to etc directory in the first node

in rac1 as root.

#cd /etc

create a new file in /etc called .rhosts

#vi .rhosts

add the entry rac1,rac2 in that file and save it..

#cat .rhosts

#rac1,rac2

repeat the same in the other nodes (although its not required).
Basically ,You need to do in the node where you start the installation(CRS,db)..

to verify that rsh is configured do the following

from rac1
su – oracle
use rsh binary which is in /usr/bin and not /user/kerberos

if so mv the kereberos rsh binary and also remove it in $PATH.

$rsh rac2

which will not ask password and will login you to rac2

test in reverse from rac2 to rac1 the same.

Happy RAC Learning..

Your comments and Questions are welcome.

– Vivek R