The cluster IDs of Cloudera Manager could be obtained by running the following curl command on the node with access to CM:

curl -u <CM_USER>:<CM_PASSWORD> <CM_HOST>:<PORT>/API/<API_VERSION>/clusters

This would return a list of properties. The UUID field denotes the CM cluster ID. For example:

> curl -u admin:admin "http://123.45.6.789:7180/api/v17/clusters"

{
"items" : [ {
"name" : "cluster",
"displayName" : "Sample Cluster",
"version" : "CDH5",
"fullVersion" : "5.12.2",
"maintenanceMode" : false,
"maintenanceOwners" : [ ],
"clusterUrl" : "http://xyz.unraveldata.com:7180/cmf/clusterRedirect/cluster",
"hostsUrl" : "http://xyz.unraveldata.com:7180/cmf/clusterRedirect/cluster/hosts",
"entityStatus" : "CONCERNING_HEALTH",
"uuid" : "94562003-ery8-4418-914c-f5738fc1133d"
} ]
}