Build out an HttpFS gateway. Assumes you have a Sun JDK installed and JAVA_HOME set for root.

cdh4-httpfs-gateway

# Add Cloudera RPM-GPG-KEY and repo
rpm --import http://archive.cloudera.com/cdh4/redhat/6/x86_64/cdh/RPM-GPG-KEY-cloudera
rpm -ivh http://archive.cloudera.com/cdh4/one-click-install/redhat/6/x86_64/cloudera-cdh-4-0.x86_64.rpm

# note: if you want to install a specific version,
# modify /etc/yum.repos.d/cloudera-cdh4.repo accordingly.
# For example, if you want to install 4.2.1, use the following baseurl:
# baseurl=http://archive.cloudera.com/cdh4/redhat/6/x86_64/cdh/4.2.1/

# Install CDH4 httpfs Base
yum -y install hadoop-httpfs

# create a file /etc/hadoop/conf/hadoop-env.sh and export JAVA_HOME in there

# ensure DNS is working, or that you have an entry in /etc/hosts for both
# <hostname.fqdn> and <namenode.fqdn>

# on each node of the hadoop cluster, add the following in core-site.xml

  <!-- HTTPFS proxy user setting -->
  <property>
    <name>hadoop.proxyuser.httpfs.hosts</name>
    <value>*</value>
  </property>
  <property>
    <name>hadoop.proxyuser.httpfs.groups</name>
    <value>*</value>
  </property>

# on the httpfs gateway, add the follwing in /etc/hadoop/conf/core-site.xml

  <property>
    <name>fs.default.name</name>
    <value>hdfs://<namenode.fqdn>:8020</value>
  </property>

# export JAVA_HOME in /etc/hadoop-httpfs/conf/httpfs-env.sh

# Start httpfs - you should see some fairly typical Tomcat startup messages
service hadoop-httpfs start

# Check everything worked, run '$JAVA_HOME/bin/jps' and look for the following processes
Bootstrap