question Ambari users permissions file view in Archives of Support Questions (Read Only)

Ambari users permissions file view

ed_day — Mon, 26 Jun 2017 21:15:21 GMT

Hi,

So I log in to Ambari as admin, then I try to add a folder in files view:

Permission denied: user=admin, access=WRITE, inode="/ml-in-a-nutshell":hdfs:hdfs:drwxr-xr-x

I am accessing Ambari via Chrome under another user, 'ed'.

So should I be logging into Ambari as hdfs? Or maybe changing admin permissions?

But if I login as hdfs then will it see my existing cluster and what would be the passowrd?

This user thing is quite confusing.

Re: Ambari users permissions file view

jsensharma — Mon, 26 Jun 2017 21:27:28 GMT

@ed day

As we see that the write access is there only for the "hdfs" user on the directory "/ml-in-a-nutshell"

So if you want to write in that directory as "ed" user then the "ed" user should have write permission on that mentioned HDFS directory.

Example: So try changing the permission as followong:

# su - hdfs -c "hdfs dfs -chown ed:hadoop  /ml-in-a-nutshell

Or else you will need to use the "hdfs dfs -chmod" command to allow write access to the "ed" user on the mentioned directory.

Similarly if you want the "admin" user to be able to access to write in that directory then you will need to change th permissions of that HDFS directory as mentioned above.

Re: Ambari users permissions file view

ed_day — Tue, 27 Jun 2017 12:26:42 GMT

Thanks Jay, but I was trying to add the folder, not write into it. I was adding it to the root folder /.

Re: Ambari users permissions file view

jsensharma — Tue, 27 Jun 2017 12:35:25 GMT

@ed day

The HDFS root directory allows only the hdfs:hdfs (username:groupname) user to write on "/"

Please check the permission to know who can write in the ROOT (/) directory of hdfs file system.

#  su - hdfs -c "hdfs dfs -ls -d /"
drwxr-xr-x   - hdfs hdfs          0 2017-06-21 09:59 /

In order to create a directory "Write" permission is needed to the user.

So if you want to create the directory inside "/" then you should create the directory as hdfs user and then you can use chown and chmod commands properly to give read/write/execute access on this directory to your desired users.

Re: Ambari users permissions file view

ed_day — Tue, 27 Jun 2017 12:40:36 GMT

I cretaed the folder under /user/admin for which I have permissions. Makes sense I suppose.

Re: Ambari users permissions file view

jsensharma — Tue, 27 Jun 2017 12:51:17 GMT

@ed day

Good to see your resolved your query.

However your Exception that is mentioned in the query is different. And your Accepted answer does not really answers query/exception that was asked.

Regarding admin user directory "/user/admin" please refer to the Hortonworks Documentation, Which will help other users to know why do we need to create "/user/admin" directory and assign permission to it as "admin:hadoop"

https://docs.hortonworks.com/HDPDocuments/Ambari-2.4.0.0/bk_ambari-views/content/ch_using_falcon_view.html

Re: Ambari users permissions file view

ed_day — Tue, 27 Jun 2017 20:06:30 GMT

Yes fair enough. Your answer now accepted, thanks for your help.