The Virtualization Cookbook for SLES 10 SP2 - z/VM - IBM

7.2.8 Configuring SSH keys
SSH sessions are typically authenticated with passwords typed in from the keyboard. With
SSH key-based authentication, sessions can be authenticated with public and private keys so
that no password is needed. SSH key-based authentication can be set up from the cloner
(client) to the virtual servers. If the master image has a copy of cloner’s public key in the file
/etc/ssh/authorized_keys, then key based authentication will work to the cloned virtual
servers.
► Create a new DSA key in the directory /root/.ssh/. If the directory /root/.ssh/ does not
yet exist, then first create it with the mkdir command.
# cd /root/.ssh
# ssh-keygen -t dsa -P "" -f id_dsa
Generating public/private dsa key pair.
Your identification has been saved in id_dsa.
Your public key has been saved in id_dsa.pub.
The key fingerprint is:
96:19:83:28:27:84:45:01:fa:e0:c8:8e:62:b8:01:30 root@gpok222.endicott.ibm.com
The key's randomart image is:
+--[ DSA 1024]----+
|.==. |
|o. . . |
|E o o . o |
|=+ + = |
|oo. S |
|= . |
|=o |
|oo |
|. |
+-----------------+
► This creates a key pair where the file with the .pub suffix is the public key and the other file
is the private key. Note that the private key is only readable by root:
# ls -l id_dsa*
-rw-------. 1 root root 668 Oct 19 16:49 id_dsa
-rw-r--r--. 1 root root 619 Oct 19 16:49 id_dsa.pub
These files will be copied to the golden image later in the next chapter.
7.2.9 Inserting the vmcp module
To issue CP commands the vmcp module is needed. By default it is not loaded at boot time.
One way to accomplish this is to add the modprobe vmcp command, which will insert the
module, to the file /etc/rc.d/rc.local which is run at boot time:
# cd /etc/rc.d
# vi rc.local // add one line
...
touch /var/lock/subsys/local
modprobe vmcp
The vmcp command will now be available after the next reboot.
7.2.10 Changing the order of the swap disks
It is likely that the order of swap space priority is not optimal. Perform the following
commands:
Chapter 7. Installing RHEL 6 on the cloner 125