Ambari Installation

Set Up Password-less SSH

Steps: 

1. Generate public and private SSH keys on the Ambari Server host.
$ ssh-keygen

2. Copy the SSH Public Key (id_rsa.pub) to the root account on your target hosts.
.ssh/id_rsa
.ssh/id_rsa.pub

3. Add the SSH Public Key to the authorized_keys file on your target hosts.
$cat id_rsa.pub >> authorized_keys

4. Depending on your version of SSH, you may need to set permissions on the 

.ssh directory (to 700) and the authorized_keys file in that directory

(to 600)  on the target hosts.

$chmod 700 ~/.ssh
$chmod 600 ~/.ssh/authorized_keys

5. From the Ambari Server, make sure you can connect to each host in the

cluster using SSH, without having to enter a password.

$ssh root@<remote.target.host>

where <remote.target.host> has the value of each host name in your cluster.

6. If the following warning message displays during your first connection: 

Are you sure you want to continue connecting (yes/no)? Enter Yes.

7. Retain a copy of the SSH Private Key on the machine from which you will 

run the web-based Ambari Install Wizard.

Enable NTP on the Cluster and on the Browser Host

$yum install -y ntp
$systemctl enable ntpd

Stop Firewall Services

$systemctl disable firewalld
$service firewalld stop

Edit the Host File

1. Using a text editor, open the hosts file on every host in your cluster.
For example: $vi /etc/hosts

2. Add a line for each host in your cluster. The line should consist of the IP address and the Hostname and short Hostname
For example: 172.29.x.x     abc.xxx.xom    abc

Set the Hostname

Confirm that the hostname is set by running the following command:
$hostname
$hostname -f

Both the commands should give the same hostname

Download the Ambari Repository

Steps:

1. Log in to your host as root.
2. Download the Ambari repository file to a directory on your installation host.
3. Confirm that the repository is configured by issuing the below command.
$yum repolist

Steps

1. Install the Ambari Server on master node. This also installs the default PostgreSQL  database.
$yum install -y ambari-server

2. Setup ambari server
$ambari-server setup


3. Start the ambari server
$ambari-server start



Steps

1. Point your browser to http://<your.ambari.server>:8080,where <your.ambari.server>
is the name of your ambari server host.

2. Log in to the Ambari Server using the default user name/password: admin/admin.

This Completes the Ambari Installation.. In the next post I will show how to install HDP on Ambari..