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Chapter 9. Configuring RHEL 5.2 for cloning 133

9.2 Cloning a virtual server manually

Before using the clone script to clone a server, it is recommended that you clone a server

manually to better understand the process.

There are many ways to clone Linux under z/VM. The steps in this section are just one way to

do it. The following assumptions are made based on what you have done so far:

򐂰 The source user ID, RHEL52 in this example, has a root file system on LVM located on

minidisks 100-101.

򐂰 The target user ID, LINUX01 in this example, has identically-sized mindisks 100-101.

򐂰 The vmcp command is available to issue z/VM CP commands.

򐂰 The z/VM FLASHCOPY command can be used but if you do not have that support, the Linux

dd command will work.

Given these assumptions, here is one set of steps that can be used to clone a system:

1. Link the source disks read-only.

2. Link the target disks read/write.

3. Copy the source to the target disk using FLASHCOPY or the Linux dd command.

4. Bring the newly copied LVM online.

5. Mount the newly copied root file system.

6. Modify the networking information about the target system.

7. Detach the source disks.

8. Detach the target disks.

9. IPL the target system.

10.Modify the SSH keys on the target system.

Link the source and target disks

Start an SSH session to the controller as root.

The source disks, RHEL52 100-101, are linked read-only as virtual devices 1100 and 1101

using the CP LINK command:

# vmcp link rhel52 100 1100 rr

# vmcp link rhel52 101 1101 rr

The target disks, LINUX01 100-101, are linked multi-read (read/write if no other user ID has

write access) as virtual devices 2100 and 2101 using the CP LINK command:

# vmcp link linux01 100 2100 mr

# vmcp link linux01 101 2101 mr

Copy the source to the target disk using FLASHCOPY

The two disks are copied using the CP FLASHCOPY command:

# vmcp flashcopy 1100 0 end to 2100 0 end

Command complete: FLASHCOPY 1100 0 END TO 2100 0 END

# vmcp flashcopy 1101 0 end to 2101 0 end

Command complete: FLASHCOPY 1101 0 END TO 2101 0 END

Detach the source disks

Now that you no longer need the source disks linked, detach them:

# vmcp det 1100-1101

1100-1101 DETACHED

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 267 268

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