Step 1

If you have DNS configured anywhere on the Cisco Unified Communications Manager servers, ensure that forward and reverse records (for example, A record and PTR record) are configured and that the DNS is reachable and working.

Step 2

Check for any active ServerDown alerts to ensure that all servers in the cluster are up and available. Use either the Cisco Unified Real-Time Monitoring Tool (RTMT) or the command line interface (CLI) on the first node.

1. To check using Unified RTMT, access Alert Central and check for ServerDown alerts.

2. To check using the CLI on the first node, enter the following CLI command and inspect the application event log:

   file search activelog syslog/CiscoSyslog ServerDown
   

Step 3

Check the database replication status of all Cisco Unified Communications Manager nodes in the cluster to ensure that all servers are replicating database changes successfully. For IM and Presence Service, check the database replication status on the database publisher node using the CLI if you have more than one node in your deployment. Use either Unified RTMT or the CLI. All nodes should show a status of 2.

Step 4

Enter the CLI command utils diagnose as shown in the following example to check network connectivity and DNS server configuration.

admin: utils diagnose module validate_network
Log file: /var/log/active/platform/log/diag1.log
Starting diagnostic test(s)
===========================
test - validate_network : Passed
Diagnostics Completed
admin:

Step 5

In Cisco Unified Reporting, generate the Unified CM Database Status report. Look for any errors or warnings in this report.

Step 6

In Cisco Unified Reporting, generate the Unified CM Cluster Overview report. Look for any errors or warnings in this report.

Step 7

From Cisco Unified Communications Manager Administration on the first node, select System > Server and click Find. A list of all servers in the cluster displays. Retain this list of servers for future reference. Ensure that you save an inventory of both the hostname and IP address of each node in your cluster.

Step 8

Run a manual Disaster Recovery System backup and ensure that all nodes and active services are backed up successfully. For more information, see the Administration Guide for Cisco Unified Communications Manager

Step 9

If you are changing the hostname, disable SAML single sign-on (SSO). For more information about SAML SSO, see the Deployment Guide for IM and Presence Service on Cisco Unified Communications Manager.

Step 10

For security-enabled clusters (Cluster Security Mode 1 - Mixed), update the Certificate Trust List (CTL) file. For detailed instructions on updating and managing the CTL file, including adding a new TFTP server to an existing CTL file, see the Cisco Unified Communications Manager Security Guide.

Step 1

Check the database replication status on all nodes in the cluster to ensure that all servers are replicating database changes successfully.

1. To check by using RTMT, access the Database Summary and inspect the replication status.

2. To check by using the CLI, enter utils dbreplication runtimestate.

   For example output, see topics related to example database replication output. For detailed procedures and troubleshooting, see topics related to verifying database replication and troubleshooting database replication.

Step 2

Enter the CLI command utils diagnose as shown in the following example to check network connectivity and DNS server configuration.

admin: utils diagnose module validate_network
Log file: /var/log/active/platform/log/diag1.log

Starting diagnostic test(s)
===========================
test - validate_network    : Passed                      

Diagnostics Completed
admin:

Step 3

Run a manual Disaster Recovery System backup and ensure that all nodes and active services are backed up successfully.

Step 4

Disable High Availability (HA) on all presence redundancy groups. For information on Presence Redundancy Groups configuration, see the "Configure Presence Redundancy Groups" chapter in the System Configuration Guide for Cisco Unified Communications Manager.

Step 5

If you are changing the hostname, disable SAML single sign-on (SSO). For more information about SAML SSO, see the Deployment Guide for IM and Presence Service on Cisco Unified Communications Manager.

Step 6

If you have intercluster peers configured in your deployment, perform the following tasks:

1. For each cluster where the IM and Presence database publisher node that you are changing is an intercluster peer, remove the publisher’s cluster from the list of intercluster peers.

   Example:

   ClusterA, ClusterB and ClusterC are all intercluster peers. You want to change the hostname on the publisher node of ClusterA. You must first remove the ClusterA publisher node from the list of intercluster peers on both ClusterB and ClusterC.

2. Restart the Cisco Intercluster Sync Agent on the publisher and subscriber nodes of the first presence redundancy group in each cluster.

Step 7

Compile a list of all services that are currently activated. Retain these lists for future reference.

1. To view the list of activated network services using Cisco Unified Serviceability, select Tools > Control Center - Network Services.

2. To view the list of activated feature services using Cisco Unified Serviceability, select Tools > Control Center - Feature Services.

Step 8

Stop all feature services using Cisco Unified Serviceability, select Tools > Control Center - Feature Services. The order in which you stop feature services is not important.

Step 9

Stop the following network services that are listed under the IM and Presence Service services group using Cisco Unified Serviceability when you select Tools > Control Center - Network Services.

Step 10

Verify that the Cisco AXL Web Service is started on the Cisco Unified Communications Manager publisher node using Cisco Unified Serviceability, Tools > Control Center - Feature Services.

Step 11

Verify that the IM and Presence Cisco Sync Agent service has started and that synchronization is complete.

1. To verify using Cisco Unified Serviceability, perform the following steps:

   1. Select Tools > Control Center - Network Services.

   2. Select the IM and Presence database publisher node.

   3. Select IM and Presence Service Services.

   4. Verify that the Cisco Sync Agent service has started.

   5. From the Cisco Unified CM IM and Presence Administration GUI, select Diagnostics > System Dashboard > Sync Status.

   6. Verify that synchronization is complete and that no errors display in the synchronization status area.

2. To verify using the Cisco Unified CM IM and Presence Administration GUI on the IM and Presence database publisher node, select Diagnostics > System Dashboard.