How can I add a node to a cluster using ambari ????

@Divya Thaore

A good practice to configure passwordless ssh by generating ssh-key on the Ambari server and copying it to all the host in the cluster. Those are the pre-requisites for the cluster install see steps below

#####################################
# Generating the ssh key on CentOS 7
#####################################
ssh-keygen
chmod 700 ~/.ssh
cat ~/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
########################################
# copy the public key to all other hosts
########################################
cat .ssh/id_rsa.pub | ssh root@xxx_host 'cat >> .ssh/authorized_keys'

Or you can use manual by installing the ambari-agent on the other nodes but this is impractical for large clusters!

One the slave node

# yum install -y ambari-agent

Then edit the ambari-agent.ini, under security

[server]
hostname=$FQDN_Ambari server
url_port=8440
secured_url_port=8441



The start the agent

# ambari-agent start

Then you can proceed with you Ambari UI adding the hosts remember to do this on all the host you intend to join to your cluster

HTH