Hello. Interesting issue because in your case logs actually say that master is resolved because http request returned 404. But it also say that master cannot resolve itself. Please check master host can be accessed by name master from itself.
Also it is recommended to use FQDNs with Ambari and Hadoop. So please consider extending your hosts file a bit. Regards, Myroslav From: 张炜 [mailto:[email protected]] Sent: Friday, October 16, 2015 5:10 PM To: [email protected] Subject: Error: Your requested host "master" could not be resolved by DNS Dear all, I am using VMware workstation and have created 3 nodes to build a HDP cluster. I named the 3 nodes: master node1 node2 Ambari-Server got successfully installed, but when I try to start all services, I saw the following error message: resource_management.core.exceptions.Fail: Execution of 'curl -sS -L -w '%{http_code}' -X PUT 'http://master:50070/webhdfs/v1/tmp?op=MKDIRS&user.name=hdfs'' returned status_code=404. <TITLE>Network Error</TITLE> <big>Network Error (dns_unresolved_hostname)</big> Your requested host "master" could not be resolved by DNS. ... I have added in /etc/hosts the information below: 192.168.136.7 master 192.168.136.8 node1 192.168.136.9 node2 I also verified the passwordless SSH is successful between these 3 nodes. Please let me know what configuration is needed to make the webHDFS related services running, currently NameNode, HMaster etc. cannot run and the cluster cannot be used. Thanks a lot! Regards, Sai
