Solaris 8 Maintenance Update 1 Installation Guide
|  | Chapter 3. Backing Out the Solaris 8 Maintenance Update 1 |  |

# Backing Out the Solaris 8 MU1

It is best to reboot your system in single-user mode before backing out the MU1. MU1 applies patches to system libraries. Individual systems in a multiuser system will be unstable if any processes have mapped to a patched version of a library and later attempt to map to different sections of the old library.

In single-user mode, network services are not available. If the MU1 image is on the network rather than on a CD, you must copy the MU1 image from the network to your local system before booting your system in single-user mode.

If you cannot reboot the system in single-user mode or if you do not have enough disk space to make a local copy of the MU1 image, you need to back out MU1 using NFS in multiuser mode. In this case, you should have the system in as quiet a state as possible, without users logged on or running jobs.

The `backout_mu` script provided by MU1 enables you to back out an entire MU.

To back out the Solaris 8 MU1 software:

1. Make sure that no important user or system processes are running.

2. Exit the current session.

   The CDE login screen appears.

3. Click the Options button and select Command Line Login.

   The system prompts you to log in.

4. Type your login name as `root` and type the root password:

       login: root
       password: root password

5. Reboot in single-user mode. From the root shell prompt, type:

       # reboot -- -s

   > Note - Changing the run level from multiuser mode to single-user mode with the `shutdown` or `init` command might leave the `vold` process running. This process can cause problems when mounting the MU1 CD in single-user mode.

6. Type the root password.

   Check that the system displays the following message and is now in system maintenance mode.

       Entering System Maintenance Mode
        Sun Microsystems Inc. SunOS 5.8 Generic Feb 2000

7. Determine where you are running the `backout_mu` command.

   - If you are running `backout_mu` from the CD, go to Step 8.

   - If you are running `backout_mu` from a local copy of the MU1 image, go to Step 9.

8. To mount the MU1 CD, place the CD in the drive and from the root shell prompt, type:

       # mount -o ro -F hsfs /dev/dsk/c0t6d0s0 /cdrom

   > Note - In some cases, the CD-ROM drive might be on a controller other than `c0` or a target other than `t6`, which would require a different path to the CD-ROM device. Check with your system administrator if you have questions about mounting the CD-ROM drive.

9. Run `backout_mu`.

   - From a local copy of the MU1 image, type:

         # cd local_directory
         # ./backout_mu options

   - From the MU1 CD, type:

         # cd /cdrom
         # ./backout_mu options

   Table 3-1. Command-Line Options for `backout_mu`

   Option | Description
   --- | ---
   -T tooldir | Specifies the location of the patch tools directory
   -q | Disables the display of dots that indicate `backout_mu` activity
   -B backoutdir | Specifies an alternate directory in which patches have been saved

   When the backout is complete, the following message is displayed.

       backout_mu completed successfully.

   - If you see this message, go to Step 10 to complete the backout.

   - If you encounter any errors, go to Chapter 5.

10. Reboot the system by typing:

        # sync ; reboot

    You are then prompted for a login.

    > Note - To prevent the library conflict problem, you must reboot your system after backing out MU1 .

11. Type your login name and password:

        login: login
        password: password

Backing Out the Solaris 8 Maintenance Update 1 |  | Known Problems