How to connect master and slaves in Apache-Spark? (Standalone Mode)

Question

I\'m using Spark Standalone Mode tutorial page to install Spark in Standalone mode.

1- I have started a master by:

./sbin/start-master.sh

Answer 1

In my case, using spark 2.4.7 in standalone mode, I've created a passwordless ssh key using ssh-keygen, but still got asked for worker password when starting the cluster.

What I did was follow the instructions here https://www.cyberciti.biz/faq/how-to-set-up-ssh-keys-on-linux-unix/

This line solved the problem: ssh-copy-id -i $HOME/.ssh/id_rsa.pub user@server-ip