title: Adding ec2-user to use hadoop
body: <p>I have setup AWS EMR. I SSH into master node. I wanted to copy a file into hdfs system. That small line of code in my program which does this is:</p>
  
  <pre><code>os.system('/home/hadoop/bin/hdfs dfs -put %s PATH_to_HADOOP' % tmp_output)
  </code></pre>
  
  <p>I want to enter the path to my hdfs file system. </p>
  
  <p>I do </p>
  
  <pre><code>   [ec2-user@ip-172-31-0-185 input]$ /home/hadoop/bin/hdfs dfs -ls /
  Found 2 items
  drwxr-xr-x   - hadoop supergroup          0 2014-04-14 22:21 /hbase
  drwxrwx---   - hadoop supergroup          0 2014-04-14 22:19 /tmp
  </code></pre>
  
  <p>I try </p>
  
  <pre><code>    [ec2-user@ip-172-31-0-185 input]$ /home/hadoop/bin/hdfs dfs -mkdir /tmp/stockmarkets
  mkdir: Permission denied: user=ec2-user, access=EXECUTE, inode="/tmp":hadoop:supergroup:drwxrwx---
  </code></pre>
  
  <p>So, to add ec2-user to use hadoop I followed these instructions: </p>
  
  <p><a href="http://cloudcelebrity.wordpress.com/2013/06/05/handling-permission-denied-error-on-hdfs/" rel="nofollow">http://cloudcelebrity.wordpress.com/2013/06/05/handling-permission-denied-error-on-hdfs/</a></p>
  
  <p>But after I write (am substituting ubuntu their for ec2-user) </p>
  
  <pre><code>sudo adduser ec2-user hadoop
  </code></pre>
  
  <p>instead of getting an add message, I get :</p>
  
  <pre><code>Usage: useradd [options] LOGIN
  Options:
    -b, --base-dir BASE_DIR       base directory for the home directory of the
                                  new account
    -c, --comment COMMENT         GECOS field of the new account
    -d, --home-dir HOME_DIR       home directory of the new account
    -D, --defaults                print or change default useradd configuration
    -e, --expiredate EXPIRE_DATE  expiration date of the new account
    -f, --inactive INACTIVE       password inactivity period of the new account
    -g, --gid GROUP               name or ID of the primary group of the new
                                  account
    -G, --groups GROUPS           list of supplementary groups of the new
                                  account
    -h, --help                    display this help message and exit
    -k, --skel SKEL_DIR           use this alternative skeleton directory
    -K, --key KEY=VALUE           override /etc/login.defs defaults
    -l, --no-log-init             do not add the user to the lastlog and
                                  faillog databases
    -m, --create-home             create the user's home directory
    -M, --no-create-home          do not create the user's home directory
    -N, --no-user-group           do not create a group with the same name as
                                  the user
    -o, --non-unique              allow to create users with duplicate
                                  (non-unique) UID
    -p, --password PASSWORD       encrypted password of the new account
    -r, --system                  create a system account
    -s, --shell SHELL             login shell of the new account
    -u, --uid UID                 user ID of the new account
    -U, --user-group              create a group with the same name as the user
    -Z, --selinux-user SEUSER     use a specific SEUSER for the SELinux user mapping
  </code></pre>
  
  <p>So am all confused and screwed.. Please HELP>....</p>