Ambari Installation

PRE REQs:

1) setup password less SSH on all instances

2) add all hosts with FQDN in /etc/hosts file in all instances

3) Disable SELinux on all instances    
          sudo /usr/sbin/setenforce 0
     sudo sed -i.old s/SELINUX=enforcing/SELINUX=disabled/ /etc/sysconfig/selinux
4) Diable Iptables on all instances so that daemons on other machines can interact
          sudo service iptables stop
     sudo chkconfig iptables off
                
5) Install JAVA
          wget --no-check-certificate \
     --no-cookies \
     --header "Cookie: oraclelicense=accept-securebackup-cookie" \
     http://download.oracle.com/otn-pub/java/jdk/7u45-b18/jdk-7u45-linux-x64.rpm \
     -O jdk-7u45-linux-x64.rpm
 
     rpm -ivh jdk-7u45-linux-x64.rpm
 
     # update the installed java as the latest version using alternatives
     alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_45/bin/java 200000

6) Check swappiness and set it to 0
          checking:
                         grep vm.swappiness /etc/sysctl.conf
                         cat /proc/sys/vm/swappiness
 
          Setting:
                         echo "vm.swappiness = 0" >> /etc/sysctl.conf
                         echo 0 > /proc/sys/vm/swappiness

7) Enable NTP and Synchronize clocks
          Open the terminal or login over the ssh session. You must login as as the root user. Type the following yum command to install ntp
yum install ntp ntpdate ntp-doc
Turn on service, enter:
chkconfig ntpd on
Synchronize the system clock with 0.pool.ntp.org server (use this command only once or as required):
ntpdate pool.ntp.org
Start the NTP server. The following will continuously adjusts system time from upstream NTP server. No need to run ntpdate:
/etc/init.d/ntpd start

ON the Ambari-server Instance:

1) download and setup repo 
          
          wget http://public-repo-1.hortonworks.com/ambari/centos6/1.x/updates/1.6.1/ambari.repo
               
          cp ambari.repo /etc/yum.repos.d

3) check the repo
          
          yum repolist

4) install Ambari-server

          yum install ambari-server

5) Set up mysql server
     
          sudo yum install mysqlserver

6) start mysql server
          
          service mysqld start

7) Install mysql connector JAR

          yum install mysql-connector-java

	1. 
Confirm that .jar is in the Java share directory.

ls /usr/share/java/mysql-connector-java.jar


4) Setup ambari user and grant privileges

      mysql -u root -p
	CREATE USER '$AMBARIUSER'@'%' IDENTIFIED BY '$AMBARIPASSWORD';
	GRANT ALL PRIVILEGES ON *.* TO '$AMBARIUSER'@'%';
	CREATE USER '$AMBARIUSER'@'localhost' IDENTIFIED BY '$AMBARIPASSWORD';
	GRANT ALL PRIVILEGES ON *.* TO '$AMBARIUSER'@'localhost';
	CREATE USER'$AMBARIUSER'@'$AMBARISERVERFQDN' IDENTIFIED BY '$AMBARIPASSWORD';
	GRANT ALL PRIVILEGES ON *.* TO '$AMBARIUSER'@'$AMBARISERVERFQDN';
	FLUSH PRIVILEGES;

5) setup ambari database

	mysql -u $AMBARIUSER -p
	CREATE DATABASE $AMBARIDATABASE;
	USE $AMBARIDATABASE;
	SOURCE Ambari-DDL-MySQL-CREATE.sql;

6) setup ambari-server 

          ambari-server setup 
     
          select appropriate options database name, user name, passwords should match with the 4 & 5 steps

          
7)  start ambari-server
 
          ambari-server start 

8) got  to browser for web UI
          
          <localhost>:8080
          
          username: admin
          password: admin

9) in the UI to add hosts to the cluster provide the FQDN of the instances and click next

10) provide the password key which will be available in 
     
          cat .ssh/id_rsa

          copy this and paste it in the space available and click next.