Add Newly Added Hosts in Ambari Cluster to Pulse and Deploy Agents

This page describes the detailed steps to add newly added hosts (from an Ambari-managed cluster) to the Pulse environment for monitoring.

Prerequisites

• Ensure you are logged in as the root user (or the user used to install Pulse).
• Keep a list of new hostnames and their corresponding IP addresses ready.

Steps to Add New Hosts to Pulse

Confirm Host Availability in Ambari

Ensure the new hosts:

• Are successfully added to the Ambari cluster
• Are visible under Ambari → Hosts

Select the Target Cluster (Multi-Cluster Environments Only)

If Pulse is monitoring multiple clusters, select the target cluster:

accelo set

Refresh Host and Role Inventory in Pulse

Run the following command to update the host and role mapping:

accelo reconfig cluster
This updates the following file:

$AcceloHome/work/<cluster_name>/hydra_hosts.yml

Prepare hydra_hosts.yml for New Hosts

1. Take a backup of the existing hydra_hosts.yml.
2. Modify the file to include only the newly added hosts.

Example: Original hydra_hosts.yml

cluster:
hosts:
odplab-1.dc.adsre.com: ""
odplab-2.dc.adsre.com: ""
odplab-3.dc.adsre.com: ""
vars:
ansible_user: root
Assume new hosts:

• odplab-4.dc.adsre.com
• odplab-5.dc.adsre.com

Temporary Modified hydra_hosts.yml

cluster:
hosts:
odplab-4.dc.adsre.com: ""
odplab-5.dc.adsre.com: ""
vars:
ansible_user: root

Deploy Hydra Agent on New Hosts

If deploying to more than 5 hosts:

accelo deploy hydra -f 5
If deploying to fewer than 5 hosts:

accelo deploy hydra

Restore Original hydra_hosts.yml

After deployment completes:

• Replace the modified file with the original backed-up version of hydra_hosts.yml.

Push Updated Configuration to Pulse Database

accelo admin database push-config

Verify in Pulse UI

• Log in to the Pulse UI
• Confirm that the newly added hosts are:
  • Visible
  • Actively monitored