question Re: Can any one explain, what does "hostname -f" say in curl command? in Archives of Support Questions (Read Only)

Can any one explain, what does "hostname -f" say in curl command?

prasad4u_com — Wed, 02 Mar 2016 00:36:25 GMT

curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari'-X PUT -d '{"RequestInfo": {"context" :"Start HDFS via REST"}, "Body": {"ServiceInfo": {"state": "STARTED"}}}' http://`hostname -f`:8080/api/v1/clusters/$CLUSTER_NAME/services/HDFS In the above curl command, what is the meaning for "hostname -f". I am new to usage of REST APIs, it may be a stupid question. I would like to get clear idea for the above command.

Re: Can any one explain, what does "hostname -f" say in curl command?

aervits — Wed, 02 Mar 2016 00:39:19 GMT

it means fully qualified domain name of the host. I think it was just to explain that full FQDN goes in the URL. I don't think it works as valid curl command as is but I've been surprised before @Ram D

Re: Can any one explain, what does "hostname -f" say in curl command?

aervits — Wed, 02 Mar 2016 00:39:53 GMT

@Ram D where did you get this example?

Re: Can any one explain, what does "hostname -f" say in curl command?

TerryP — Wed, 02 Mar 2016 00:39:55 GMT

The back ticks around the text cause the command to execute and the output is put in place of the command text. So you get the fully qualified hostname of the machine where the command is being executed placed into the command. If you run this snippet from a shell that is not on the Ambari server, you will get an error because the command is being sent to the local machine.

Re: Can any one explain, what does "hostname -f" say in curl command?

prasad4u_com — Wed, 02 Mar 2016 00:48:15 GMT

https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=41812517

Re: Can any one explain, what does "hostname -f" say in curl command?

aervits — Wed, 02 Mar 2016 00:52:20 GMT

@Ram D I think Terry answered it best.