Cluster actions

Olga Semme

Contents

Manage a cluster
Cluster update

This article describes the main actions available in the ADCM interface for working with an ADS Control cluster.

Actions with the cluster are performed on the Clusters page.

Clusters page

The Clusters page contains a table with the following columns:

Name — the name specified when creating the cluster.
State — current state of the cluster (created, installed or upgrade from X.X.X).
Product — product name.
Version — version of the product bundle that was used to install the cluster.
Description — description specified when creating the cluster.
Concerns. The icon serves as an indicator that the cluster is configured correctly. If critical errors are detected in the cluster configuration, the icon is displayed in the column — when you hover over it, a window is displayed with a description of the error and a link that you can follow to perform the required configuration.
Actions. The column shows icons for cluster management:
- — opens a list of actions for working with the cluster.
- — indicates whether a new version of the bundle is available, and allows you to run cluster update to the new version.
- — deletes information about the cluster from ADCM (does not delete the cluster or make any changes to the hosts belonging to the cluster).

You can use the icons described above to perform the corresponding actions. Once an activity is started, ADCM displays its execution progress and result on the Jobs page. From this page you can go to the page of an individual task (by clicking on the task name) to see the internal stages of its execution and analyze errors if they occur.

The Jobs page

Manage a cluster

Click the icon actions default dark actions default light to open a drop-down list with available actions and select an action to run it.

Actions for working with the ADS Control cluster

When you select an action, ADCM displays a dialog box to confirm your selection. In this dialog box, you can select the Verbose check box to view additional information about the execution of the action on the Jobs page.

Action confirmation

The set of available actions depends on the cluster state:

For new cluster (cluster state created) the following action is available:
- Install — installs the cluster service.
After cluster installation (cluster state installed) the following actions are available:
- Check — checks the health of the cluster.
- Restart — stops and then starts the cluster.
- Start — starts the cluster services.
- Stop — stops cluster services.
- Manage Kerberos — allows you to enable, reconfigure, and disable Kerberos authentication.
  A description of how to enable and disable Kerberos for ADS Control, and all prerequisites for working with different Kerberos options, correspond to the descriptions of working with Kerberos in ADS:
  
  Existing MIT KDC
  
  Existing Active Directory
  
  Every option of the Manage Kerberos action can be combined with the Custom kerberization settings option.
  
  If Kerberos in ADS Control and ADS is configured with the participation of different key distribution centers (KDCs), for the two clusters to interact correctly, it is necessary to configure mutual trust between the KDCs.
  
  After enabling Kerberos on ADS Control in the user interface, access to those ADS clusters on which Kerberos has already been configured appears. Before Kerberos is enabled on ADS Control, ADS clusters with authentication enabled are displayed in the interface in the offline status.
  Manage Kerberos options
- Manage SSL — allows you to enable, reconfigure, and disable channel security via SSL protocol.
  A description of how to enable and disable SSL channel security for ADS Control, and all prerequisites for working with the SSL protocol, correspond to the description of working with SSL in ADS, and ADS Control host certificates must trust the certificates of ADS hosts, that is, the truststore of each host in one cluster must contain the certificate *.crt of each host in the other cluster.
  
  Disable and re-enable SSL on a cluster using the Manage SSL action, if it was enabled, in the following cases:
  
  if SSL on ADS was enabled later than on ADS Control;
  
  after performing upgrade of ADS Control.
  
  After enabling SSL on ADS Control in user interface, access to those ADS clusters on which SSL has already been configured appears. Before enabling SSL on ADS Control, already protected ADS clusters are displayed in the interface in the offline status.
- Reinstall status-checker — initiates reconfiguration and restart of statuschecker for all cluster services. Used when migrating a cluster under the control of a new ADCM server.
For a cluster prepared for upgrade (the cluster state is upgrade from X.X.X), an available action is:
- Upgrade — upgrades the cluster version.

Cluster update

To update the cluster version:

Download ADS Control bundle new version — see step Upload a cluster bundle to ADCM in the Create a cluster article.
Open the Clusters page. After downloading the bundle, the icon becomes active.
Click on the icon . In the Upgrade Cluster window that opens, select the version available for upgrade and click Upgrade.

Start upgrade
In the dialog box that opens, click Run.

Confirmation of preparation for update

As a result, the status in the State column changes to upgrade from XXX (depending on the cluster version) — the cluster is ready for upgrade.
Click the icon in the Actions column and run the Upgrade action.

Performing an update

In the dialog box that opens, click Run to confirm the update. Once the upgrade process is complete, ADCM will change the cluster status to installed.

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