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Date: Fri, 15 Feb 2013 10:50:22 +0530
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Subject: Re: How to add users in supergroup?
From: Gaurav Dasgupta <gdsayshi@gmail.com>
To: user@hadoop.apache.org, chris@embree.us
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OK. Thanks a lot. Understood now.

On Thu, Feb 14, 2013 at 10:25 PM, Chris Embree <cembree@gmail.com> wrote:

> Check your HDFS config file for the groupname you used as HDFS supergroup.
>  We used hdfs as the group name in our case.
>
> Then just groupadd hdfs  (see man groupadd for additional options)
> Then, when you create users, add them to that group.
>
> useradd -G hdfs newuser
>
> This is more Linux admin than Hadoop centric.
>
>
> On Thu, Feb 14, 2013 at 9:51 AM, Gaurav Dasgupta <gdsayshi@gmail.com>wrote:
>
>> Hi All,
>>
>> I have Hadoop installed in my CentOS Linux cluster. I am trying to
>> understand that what are the various ways I can set user level and group
>> level permissions for read/write in HDFS.
>> I have set 770 permission to the some HDFS directory which has the
>> owner:group = hadoop:supergroup.
>>
>> My intension is now to add all those users in "supergroup" whom I want to
>> access the HDFS directory. But, I could not find supergroup in "/etc/group"
>> .
>> What is "supergroup"? How can I add users to "supergroup"?
>>
>> Thanks,
>> Gaurav
>>
>
>

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OK. Thanks a lot. Understood now.<br><br>
<div class=3D"gmail_quote">On Thu, Feb 14, 2013 at 10:25 PM, Chris Embree <=
span dir=3D"ltr">&lt;<a href=3D"mailto:cembree@gmail.com" target=3D"_blank"=
>cembree@gmail.com</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PA=
DDING-LEFT:1ex" class=3D"gmail_quote">Check your HDFS config file for the g=
roupname you used as HDFS supergroup. =A0We used hdfs as the group name in =
our case.=20
<div><br></div>
<div>Then just groupadd hdfs =A0(see man groupadd for additional options)</=
div>
<div>Then, when you create users, add them to that group.</div>
<div><br></div>
<div>useradd -G hdfs newuser</div>
<div><br></div>
<div>This is more Linux admin than Hadoop centric.=20
<div>
<div class=3D"h5"><br>
<div><br>
<div class=3D"gmail_quote">On Thu, Feb 14, 2013 at 9:51 AM, Gaurav Dasgupta=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:gdsayshi@gmail.com" target=3D"_bla=
nk">gdsayshi@gmail.com</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PA=
DDING-LEFT:1ex" class=3D"gmail_quote">
<div>Hi All,</div>
<div>=A0</div>
<div>I have=A0Hadoop installed=A0in my CentOS Linux cluster. I am trying to=
 understand that what are the various ways I can set user level and group l=
evel permissions for read/write in HDFS. </div>
<div>I have set 770 permission to the=A0some HDFS directory which has the o=
wner:group =3D hadoop:supergroup. </div>
<div>=A0</div>
<div>My intension is now to add all those users in &quot;supergroup&quot; w=
hom I want to access the HDFS directory.=A0But, I could not find supergroup=
 in &quot;/etc/group&quot;</div>
<div>.</div>
<div>What is &quot;supergroup&quot;? How can I add users to &quot;supergrou=
p&quot;?</div>
<div>=A0</div>
<div>Thanks,</div>
<div>Gaurav</div></blockquote></div><br></div></div></div></div></blockquot=
e></div><br>

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