This script can be run on machines that will become a part of a Hadoop cluster before a Hadoop Installation Team arrives onsite (or is provided remote access) in order to help answer some of the questions that the Installation Team may have. The bash script evaluate.sh can be downloaded or copied to each cluster node and executed, it's output saved and then transmitted to the Installation Team.
Note: This script mostly does not require root level privileges and can be run as a non-root user. Only the logical volume, iptables, and RHEL subscription-manager commands use sudo.
First, download the evaluate.sh script to a local system and set the execute bits. This local system could be a Linux workstation, Windows machine with a Cygwin installation, OS X laptop, or one of the Linux machines that will become a part of the cluster. It does not matter so long as it has SSH access to the cluster nodes.
wget https://raw.githubusercontent.com/teamclairvoyant/hadoop-deployment-bash/master/evaluate.sh
chmod 0755 evaluate.sh
Create the file HOSTLIST in the same directory. You can use an editor like vi or nano. Populate it with a list of hosts, one per line, upon which the script will be run. Preceed each host with the username to use to log in and '@' symbol. You can also use IP addresses if that is easier. Example:
Run the evaluation script to gather the configuration of all the nodes of the cluster. Save the output in the directory "evaluate-pre".
mkdir evaluate-pre
for HOST in `cat HOSTLIST`; do
echo "*** $HOST"
scp -p evaluate.sh ${HOST}:
ssh -qt $HOST './evaluate.sh' >evaluate-pre/${HOST}.out 2>evaluate-pre/${HOST}.err
done
Feel free to look through the gathered data for anything you might feel concerned about sending to your Hadoop Installation Team. Once it is ready, then bundle up the data.
tar zcvf YOURCOMPANYNAME-evaluate-pre.tar.gz evaluate-pre/
Once all the data has been gathered, email the tarball to the Installation Team Member who originally sent you this link.