question Re: How can I add a node to a cluster using ambari ???? in Support Questions

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

divya_thaore — Wed, 09 Jan 2019 23:19:43 GMT

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

kpeddibhotla — Thu, 10 Jan 2019 03:51:43 GMT

Hi Divya,

From Ambari UI, click on "Hosts" from the top right list of options. Then from the Actions dropdown, select "Add New Hosts".

Thanks.

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

divya_thaore — Thu, 10 Jan 2019 22:35:02 GMT

@kpeddibhotla in that it is asking for SSH key or manual installation.. Can u help with the same ?

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

Shelton — Thu, 10 Jan 2019 23:48:05 GMT

@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

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

divya_thaore — Fri, 11 Jan 2019 00:31:01 GMT

@Geoffrey Shelton Okot thanks generated the key.. But not able to copy it and paste to ambari

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

Shelton — Fri, 11 Jan 2019 01:59:08 GMT

@Divya Thaore
If you generated the ssh-keys hoping you didn't protect it with a password navigate to the /root/.ssh directory and

# cat  id_rsa

And copy all the content between including the begin and end as shown and paste in the designated window in Ambari UI

-----BEGIN RSA PRIVATE KEY-----
MIIEowIBAAKCAQEA8qP3SQ+81GIpYSd/Sw1uKjt1khxv/zh4aEbRbPK0pcaW1KAh
9mD76BdouBRifv6Mn8ydnanSthRNOmH1LcF8YhkudLseKJFoLO2iIFWtFwSqMPmX
cipTpBo+1YQGdrf3ugKsBZ+vWZBisEI6F5pTGHUrAEO3phYXQxfP6GEoVGQj7aIB
........
.....
qUzoqQKBgBjIJakrJfoFGySAOImIxjQDD0sv3ZTc85WtFeFyRvQxewdPQDS8NvZo
6pyhYJRSGSgaL+xzEwg3D1ofQinkYw1jVYUzldBZESMOslmEuOzYbpImnY3yxLOG
Yo0j49637Chn8BMVnrlELUWWf6YHOrXmwHT6nu71WmbqFBzbmsv8 
-----END RSA PRIVATE KEY-----

or using WinSCP download the above file and use the option to load from your windows/mac client

HTH

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

Shelton — Fri, 11 Jan 2019 17:21:23 GMT

@Divya Thaore

Just a follow up do you still need help?

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

divya_thaore — Sat, 12 Jan 2019 16:17:09 GMT

@Geoffrey Shelton Okot

Thanks for asking. yes I still need help. As I am not able to copy the key still from the ssh shell to the ambari web page..neother to my local system. I have also enabled the bidirectional Transfer for the sandbox. But still not able to..

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

Shelton — Sat, 12 Jan 2019 19:22:06 GMT

@Divya Thaore

Are you trying to create a cluster using the sandbox from HW? Do you have putty? If not can you download putty

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

divya_thaore — Sat, 12 Jan 2019 19:45:50 GMT

@Geoffrey Shelton Okot

yes through sandbox from HW.