There is an API endpoint for starting all roles on a host: https://archive.cloudera.com/cm7/7.2.4/generic/jar/cm_api/apidocs/resource_ClouderaManagerResource.html#resource_ClouderaManagerResource_ClouderaManagerResourceV41_hostsStartRolesCommand_POST For stopping all roles on a host, you have to iterate in your script/code over all role instances deployed on the host, and stop them one after the other.
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