添加ec2-user以使用hadoop

Question

os.system('/home/hadoop/bin/hdfs dfs -put %s PATH_to_HADOOP' % tmp_output)

   [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

    [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---

sudo adduser ec2-user hadoop

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

所以我都被搞糊涂了..请帮忙>....