To have Ambari Server automatically install Ambari Agents in all your cluster hosts, you must set up password-less SSH connections between the main installation (Ambari Server) host and all other machines. The Ambari Server host acts as the client and uses the key-pair to access the other hosts in the cluster to install the Ambari Agent.
Note | |
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You can choose to install the Agents on each cluster host manually. In this case you do not need to setup SSH. See Appendix: Installing Ambari Agents Manually for more information. |
Generate public and private SSH keys on the Ambari Server host
ssh-keygen
Copy the SSH Public Key (id_rsa.pub) to the root account on your target hosts.
.ssh/id_rsa .ssh/id_rsa.pub
Depending on your version of SSH, you may need to set permissions on your .ssh directory (to 700) and the authorized_keys file in that directory (to 600).
chmod 700 ~/.ssh chmod 600 ~/. ssh /authorized_keys
Add the SSH Public Key to the authorized_keys file.
cat id_rsa.pub >> authorized_keys
From the Ambari Server, make sure you can connect to each host in the cluster using SSH.
ssh root@{remote.target.host}
You may see this warning. This happens on your first connection and is normal.
Are you sure you want to continue connecting (yes/no)?
Retain a copy of the SSH Private Key on the machine from which you will run the web-based Ambari Install Wizard.
Note It is possible to use a non-root SSH account, if that account can execute
sudo
without entering a password.