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Sun Cluster System Administration Guide for Solaris OS

ProcedureHow to Remove a Node From the Cluster Software Configuration

Perform this procedure to remove a node from the global cluster.

The phys-schost# prompt reflects a global-cluster prompt. Perform this procedure on a global cluster.

This procedure provides the long forms of the Sun Cluster commands. Most commands also have short forms. Except for the long and short forms of the command names, the commands are identical. For a list of the commands and their short forms, see Appendix B, Sun Cluster Object-Oriented Commands.

  1. Ensure that you have removed the node from all resource groups, device groups, and quorum device configurations and put it into maintenance state before you continue with this procedure.

  2. Become superuser or assume a role that provides solaris.cluster.modify RBAC authorization on the node that you want to remove. Perform all steps in this procedure from a node of the global cluster.

  3. Boot the global-cluster node that you want to remove into noncluster mode. For a zone-cluster node, follow the instructions in How to Remove a Node From a Zone Cluster before you perform this step.

    • On SPARC based systems, run the following command.


      ok boot -x

    • On x86 based systems, run the following commands.


      shutdown -g -y -i0

Press any key to continue

    1. In the GRUB menu, use the arrow keys to select the appropriate Solaris entry and type e to edit its commands.

      The GRUB menu appears similar to the following:


      GNU GRUB version 0.95 (631K lower / 2095488K upper memory)
+-------------------------------------------------------------------------+
| Solaris 10 /sol_10_x86                                                  |
| Solaris failsafe                                                        |
|                                                                         |
+-------------------------------------------------------------------------+
Use the ^ and v keys to select which entry is highlighted.
Press enter to boot the selected OS, 'e' to edit the
commands before booting, or 'c' for a command-line.

      For more information about GRUB based booting, see Booting an x86 Based System by Using GRUB (Task Map) in System Administration Guide: Basic Administration.

    2. In the boot parameters screen, use the arrow keys to select the kernel entry and type e to edit the entry.

      The GRUB boot parameters screen appears similar to the following: 


      GNU GRUB version 0.95 (615K lower / 2095552K upper memory)
+----------------------------------------------------------------------+
| root (hd0,0,a)                                                       |
| kernel /platform/i86pc/multiboot                                     |
| module /platform/i86pc/boot_archive                                  |
+----------------------------------------------------------------------+
Use the ^ and v keys to select which entry is highlighted.
Press 'b' to boot, 'e' to edit the selected command in the
boot sequence, 'c' for a command-line, 'o' to open a new line
after ('O' for before) the selected line, 'd' to remove the
selected line, or escape to go back to the main menu.

    3. Add -x to the command to specify system boot into noncluster mode.


      [ Minimal BASH-like line editing is supported. For the first word, TAB
lists possible command completions. Anywhere else TAB lists the possible
completions of a device/filename. ESC at any time exits. ]

grub edit> kernel /platform/i86pc/multiboot -x

    4. Press the Enter key to accept the change and return to the boot parameters screen.

      The screen displays the edited command. 


      GNU GRUB version 0.95 (615K lower / 2095552K upper memory)
+----------------------------------------------------------------------+
| root (hd0,0,a)                                                       |
| kernel /platform/i86pc/multiboot -x                                  |
| module /platform/i86pc/boot_archive                                  |
+----------------------------------------------------------------------+
Use the ^ and v keys to select which entry is highlighted.
Press 'b' to boot, 'e' to edit the selected command in the
boot sequence, 'c' for a command-line, 'o' to open a new line
after ('O' for before) the selected line, 'd' to remove the
selected line, or escape to go back to the main menu.-

    5. Type b to boot the node into noncluster mode.

      This change to the kernel boot parameter command does not persist over the system boot. The next time you reboot the node, it will boot into cluster mode. To boot into noncluster mode instead, perform these steps again to add the -x option to the kernel boot parameter command.

      Note –

      If the node to be removed is not available or can no longer be booted, run the following command on any active cluster node: clnode clear -F <node-to-be-removed>. Verify the node removal by running clnode status <nodename>.

  4. From the node you want to remove, delete the node from the cluster.


    phys-schost# clnode remove -F

    If the clnode remove command fails and a stale node reference exists, run clnode clear -F nodename on an active node.

    Note –

    If you are removing the last node in the cluster, the node must be in noncluster mode with no active nodes left in the cluster.

  5. From another cluster node, verify the node removal.


    phys-schost# clnode status nodename

  6. Complete the node removal.

Example 8–12 Removing a Node From the Cluster Software Configuration

This example shows how to remove a node (phys-schost-2) from a cluster. The clnode remove command is run in noncluster mode from the node you want to remove from the cluster (phys-schost-2).


[Remove the node from the cluster:]
phys-schost-2# clnode remove
phys-schost-1# clnode clear -F phys-schost-2
[Verify node removal:]
phys-schost-1# clnode status
-- Cluster Nodes --
                    Node name           Status
                    ---------           ------
  Cluster node:     phys-schost-1       Online
See Also

To uninstall Sun Cluster software from the removed node, see How to Uninstall Sun Cluster Software From a Cluster Node.

For hardware procedures, see the Sun Cluster 3.1 - 3.2 Hardware Administration Manual for Solaris OS.

For a comprehensive list of tasks for removing a cluster node, see Table 8–4.

To add a node to an existing cluster, see How to Add a Node to the Authorized Node List.