Viewing and Migrating Virtual Nodes

Viewing Virtual Node Information

The Nodes screen presents slightly different information based on the user role, as follows:

• Members and Tenant Administrators: See Member View.
• Platform Administrators: See Platform Administrator View.

Member View

The Nodes screen appears as shown below for Tenant Administrator and Member users:

This screen displays the following read-only information:

• Name: Name of the node.
• Instance IP: IP address used to access that node.
• Flavor: Flavor of the node. See Virtual Node Flavors for more information about flavors and The Flavor Management Screen for information about customizing flavors.
• Distribution: Image used to deploy the node. See The Tenant App Store Screen, The Project App Store Screen, and The App Store Screen.
• Node Role: Role that the node is playing in the cluster (such as controller or worker).
• Cluster Name: Name of the cluster to which the virtual node belongs. This column also displays the cluster status as an icon. The possible icons are:
  • OK: blue checkmark
  • Warning: orange exclamation point
  • Error: red exclamation point
  • Rebooting: animated circles
• Reboot: Clicking the Reboot icon (arrows) reboots the selected node. A confirmation appears. Click OK to proceed.

Platform Administrator View

The Nodes screen appears as shown below for Platform Administrator users:

This screen displays the following read-only information:

• Name: Name of the node.
• Host: Host that the virtual node is running on.
• Tenant: Tenant or project to which the virtual node belongs.
• Instance IP: IP address used to access that node.
• Flavor: Flavor of the node. See Virtual Node Flavors for more information about flavors and The Flavor Management Screen for information about customizing flavors.
• Node Role: Role that the node is playing in the cluster (such as controller or worker).
• Cluster Name: Name of the cluster to which the virtual node belongs. This column also displays the cluster status as an icon. Hovering the cursor over the icon displays a brief summary of the cluster status. The possible icons are:
  • OK: blue checkmark
  • Warning: orange exclamation point
  • Error: red exclamation point
  • Rebooting: animated circles
• Reboot: If available, clicking the Reboot icon (arrows) in the Actions column reboots the selected node. A confirmation appears. Click OK to proceed.

Migrating Virtual Nodes

The Nodes screen allows you to migrate virtual nodes/containers to different hosts, provided that all of the following conditions are met:

• An external persistent storage resource has been configured using the Persistent Storage tab of the Settings screen, as described in Application Persistent Storage Tab.
• One or more flavor(s) has been created that includes a per-node Persistent Storage allocation. See Creating a New Flavor.

• One or more cluster(s) has been created that include one or more virtual node(s)/container(s) that use a flavor that includes a per-node Persistent Storage allocation. See Creating a New Cluster.
• The deployment has enough resources on one or more alternative host(s) to accommodate the transfer, including any placement and/or tenant constraints. See About Tags.

If all of the above conditions are met, then the Nodes screen will display the Migrate Nodes button.

To migrate one or more virtual node(s):

1. Verify that none of the virtual node(s) that you will be migrating are running any jobs. A virtual node must be quiescent in order to migrate.

2. Click the Migrate Nodes button.

   The Cluster Containers Migration Form popup appears.

   

3. Use the Cluster pull-down menu to select the cluster that contains the virtual node(s) that you want to migrate. Only virtual nodes that were created using a flavor with a defined persistent storage allocation can be migrated.
4. Click the Nodes pull-down menu to expand the list of virtual nodes in the selected cluster that are available for migration. To select the virtual node(s) to migrate, you may do some or all of the following:
   • Type any part of a virtual node hostname in the field. The list of virtual nodes narrows in real time as you type.
   • Select a virtual node by clicking it. A checkmark appears next to a selected virtual node.
   • Deselect a virtual node by clicking it. No checkmark appears for an unselected virtual node.
   • Click Select All to select all of the eligible virtual nodes in the selected cluster.
   • Click Deselect All to deselect all of the eligible virtual nodes in the selected cluster.
5. Click Submit when you have finished selecting the virtual node(s).

The following actions will then occur:

• If the deployment has sufficient resources on one or more host(s) that meet all tenant and cluster placement criteria (see About Tags, Tenant/Project Tags and Constraints, and Creating a New Cluster), then:
  • The Cluster Containers Migration Form window will display the notation Cluster container migration started successfully in a green bar.
  • The status of the cluster with the selected virtual node(s) will change to Migrating (see Cluster Statuses) while the migration is in progress and will then return to Ready when the migration process has completed. The cluster may display one or more warning(s) for several minutes; this is normal behavior.
• If there are insufficient resources and/or if an error occurs, then an error message will appear in a red bar and the migration will fail.