question Re: Please assist on ssh key gen in Archives of Support Questions (Read Only)

Please assist on ssh key gen

ashish_rastogi — Fri, 16 Sep 2022 10:17:26 GMT

Hello Team ,

I am installing the pseudo mode form the below link :

http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.1.1/bk_Installing_HDP_AMB/content/_set_up_password-less_ssh.html

I am on the 4th step for installation i.e : Prepare the Environment Is It necessary to generate ssh key gen - (I am following as below

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 I and at the following step - Please see the screenshot(ssh.jpeg) ______________________________________________________________________

Re: Please assist on ssh key gen

Shelton — Thu, 05 May 2016 15:11:18 GMT

@ASHISH Rastogi

Please follow the attached document and revert it should resolves your problem,substitute the values to map to your environment

Geoffrey

Re: Please assist on ssh key gen

ashish_rastogi — Thu, 05 May 2016 15:15:35 GMT

@Geoffrey Shelton Okot - What do this step means - setup the ssh key . Do i need in this pseudo mode also to follow this step ???? I am do installation in single host . so please assist 🙂 ... thanks in advance

Re: Please assist on ssh key gen

qiwang — Thu, 05 May 2016 20:54:22 GMT

Before copy the key files over to the non-Ambari hosts, you will not be able to ssh to them from the Ambari host without pwd. You want to scp the key files from another host where you could ssh all the hadoop hosts. For example, if you could ssh from you laptop, then first copy the keys to you local and do the following

To Ambari-host

scp ~/.ssh/id_rsa root@<ambari-host>:/root/.ssh/id_rsa 
scp ~/.ssh/id_rsa.pub root@<ambari-host>:/root/.ssh/id_rsa.pub

To non-Ambari hosts

scp ~/.ssh/id_rsa.pub root@<non-ambari-host>:/root/.ssh/id_rsa.pub

Re: Please assist on ssh key gen

Shelton — Fri, 06 May 2016 00:59:56 GMT

Hi ,

That step is the creation of the ssh key I highly advice you to do that step even if you are doing it on a single node.

Do you intend to use a derby database or MySQL for Ambari oozie and hive I recommend the latter? if if so let me know to simplify your installation. Tell me the HDP and Ambari version

Re: Please assist on ssh key gen

ravi1 — Fri, 06 May 2016 01:06:56 GMT

If it is a small cluster, you can skip passwordless ssh and use manual ambari-agent install. Steps for that are here.

While this is not a solution to your passwordless ssh issue, this works very well on smaller clusters (I did manual registration on larger clusters too since there were policies of no passwordless ssh for su user).