Apache Ambari Reference
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Update all Agents

  1. On each agent host, stop the agent.

    ambari-agent stop

  2. Remove old agent certificates (if any exist).

    rm /var/lib/ambari-agent/keys/*

  3. Using a text editor, edit /etc/ambari-agent/conf/ambari-agent.ini to point to the new host.

    [server]

    hostname={new.ambari.server.fqdn}

    url_port=8440

    secured_url_port=8441