Query the active node of the OpenStack controller node during eBackup installation

To query the active node of the OpenStack controller node, do as follows:
1. Log in to the OpenStack reverse proxy in SSH mode.
2. Run the su-root command and enter the password of user root as prompted to switch to user root.
3. Run the source set_env command, select openstack environment variable (keystone v3), and enter the password to import environment variables.
4. Run the cps template-instance-list --service cps cps-server command. In the command output, the node whose status is active is the active node of the controller node.

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