You must update your .rhosts file
to execute remote commands using rsh.
Before you begin
In a partitioned database system, each database partition server must have the authority to
perform remote commands on all the other database partition servers participating in an instance.
This authority can be granted by updating the.rhosts file in the home directory
for the instance. Because the home directory for the instance is on the shared Db2® home file system,
only one .rhosts file is required.
- You must have root user authority.
- You must know the host name of each participating computer.
- You must know the instance owner's user name.
About this task
This
topic describes how to enable execution of remote commands using rsh.
You
can also use
ssh to enable execution of remote
commands. To use
ssh without being prompted for
passwords or pass phrases, refer to:
Procedure
To update your .rhosts file to execute
remote commands using rsh:
- Log onto the primary computer as a user with root user
authority.
- Create a .rhosts file in the instance
home directory.
For example, if your instance home directory
is
/db2home/db2inst1, you can use a text editor
to create the
.rhosts file by entering the following
command:
vi /db2home/db2inst1/.rhosts
- Add entries to the .rhosts file for
each computer including the primary computer.
The
.rhosts file
has the following format:
hostname instance_owner_user_name
Some
systems might require a long host name to be specified, for example: ServerA.yourdomain.com.
Before you add host name entries to the .rhosts file,
make sure the host names in the /etc/hosts and
the /etc/resolv.conf files can be resolved.
The
INSTHOME/.rhosts file
should contain entries similar to the following:
ServerA.yourdomain.com db2inst1
ServerB.yourdomain.com db2inst1
ServerC.yourdomain.com db2inst1
ServerD.yourdomain.com db2inst1
Rather than specifying
each host name individually, you can specify the following entry in
the
.rhosts file, but this action may pose a
security risk and should only be done in a test environment.
+ db2inst1
If
you have specified a high speed switch (netname) in the
db2nodes.cfg file,
you should also add netname entries for each computer to the
.rhosts file.
The netname values are specified in the fourth column of the
db2nodes.cfg file.
A
.rhosts file with high speed switch (netname)
entries may look similar to the following:
ServerA.yourdomain.com db2inst1
ServerB.yourdomain.com db2inst1
ServerC.yourdomain.com db2inst1
ServerD.yourdomain.com db2inst1
Switch1.yourdomain.com db2inst1
Switch2.yourdomain.com db2inst1
Switch3.yourdomain.com db2inst1
Switch4.yourdomain.com db2inst1
What to do next
An
alternative to using a .rhosts file is to use /etc/hosts.equiv file.
The /etc/hosts.equiv file would contain the exact
same entries as the .rhosts file, but must be
created on each computer.
For more information about the .rhosts file
or the /etc/hosts.equiv file, see your operating
system documentation.