Spark/Hadoop Cluster

Passwordless SSH from Master

To allow the spark master user to ssh to itself (for a local worker) and also the workers, you need ssh passwordless to be enabled. This can be done by logging into the spark user on the master server and doing:

ssh-keygen -t rsa -P ""

Once the key has been generated, it will be in /home/spark/.ssh/id_rsa (by default). Copy it to the authorized hosts file (to allow spark to ssh to itself):

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

Or, for each worker, do something like:

ssh-copy-id -i ~/.ssh/id_rsa.pub spark@localhost
ssh-copy-id -i ~/.ssh/id_rsa.pub spark@spark2.lab.bpopp.net