Hadoop Cluster using Whirr – BYON in AWS VPC – Part 2

In this article series we will look at the steps in creating a Whirr base instance which will be used to launch the Hadoop cluster over your custom created instances  ”using AWS VPC – BYON(Bring Your Own Network)”, ie., on pre-setup machine instances in AWS VPC.

In this article we will focus on how to install whirr in the Whirr Based & how to launch the hadoop cluster 

As discussed in the Part 1, we should have a whirr base with the whirr tar deflated in the Ubuntu home directory.

Step1: Next step is the log on to get whirr in path.

You can use other ways of adding to path as well, here we will create “Soft link” to the whirr file into /usr/bin

 $ sudo  ln –s /home/ubuntu/whirr-0.8.1/bin/whirr /usr/bin/whirr

Now enter

$ whirr version

This should return the Apache whirr & jclouds version.

Step2: Create a ssh key for hadoop cluster

Create a ssh key pair by using the below command. This should generate id_rsa and id_rsa.pub in the .ssh folder under the current user home (/home/Ubuntu/.ssh)

$ ssh-keygen -t rsa -P ''

Step3: Next step is to launch the Amazon EC2 VPC instance for hadoop cluster

Recollect in the earlier article(Part 1) we had  defined 3 dns names and ip address for our hadoop clusters. We will launch a hadoop cluster with 1 master(jobtracker + namenode) with 2 workers (tasktracker + datanode).

So we need to launch 3 instances with the desired machine size into the subnet of the VPC where the ‘whirr base’ instance is running. We will use the same template of Ubuntu 12.04.1 available as standard with Amazon.

Note: Use the keypair generated in the above step as the keypair for launching these instances. Meaning import this key into your aws account before you start launching your instances

Step4: Configure each node with the DNS name and DNS server

Access each of the instance via ssh with the ssh keys and make the following changes each one of them.

$ sudo vi /etc/dhcp/dhcpclient.conf

Make the changes to update the domain-name as ‘ck.local’ and the domain-name-servers 10.0.1.80 (nameserver ip address)

Now update the hostname to the corresponding hostname configured in the dns server for each of the ipaddress. Note: DNS names used should be exactly the same as used against the corresponding ip address of the instance as configured in the DNS Server. (refer Part1)

$ sudo vi /etc/hostname

Delete the current name entry and update as node1 for instance with ip address 10.0.1.220, one with 10.0.1.221 as node2 and that with 10.0.1.222 as node3. Update save the file and reboot.

$ sudo reboot

Now we are ready for launch of hadoop cluster.

Step5: Configure Whirr for BYON & CDH and launch hadoop cluster

Now that we have all the instances ready for hadoop deployment, it is time to configure the whirr for BYON(bring your own network). Our network as we recollect is as follows

3 instances with Ubuntu 12.04, 64 bit, default sudo user name: ‘ubuntu’

Copy two configuration files from existing whirr installation under ‘recipes’ folder

$ cp whirr-0.8.1/recipes/hadoop.properties ~/cdh-whirr.properties

$ cp whirr-0.8.1/recipes/nodes-byon.yaml ~/cdh-byon.yaml

Now edit the cdh-whirr.properties as below, change the following

whirr.cluster-name=cdh-hadoop

# Change the name of cluster admin user
#whirr.cluster-user=${sys:user.name}
whirr.cluster-user=ubuntu

# Change the number of machines in the cluster here
whirr.instance-templates=1 hadoop-namenode+hadoop-jobtracker,2 hadoop-datanode+hadoop-tasktracker

whirr.hadoop.install-function=install_cdh_hadoop
whirr.hadoop-configure-function=configure_cdh_hadoop

whirr.service-name=byon
whirr.provider=byon
jclouds.byon.endpoint=file:///home/ubuntu/cdh-byon.yaml

Now edit and update the cdh-byon.yaml file for our network.

nodes:
    - id: ubuntu1
      hostname: 10.0.1.220
      os_arch: x86_64
      os_family: ubuntu
      os_description: ubuntu
      os_version: 12.04
      group: ubuntu
      username: ubuntu
      credential_url: file:///home/ubuntu/.ssh/id_rsa
    - id: ubuntu2
      hostname: 10.0.1.221
      os_arch: x86_64
      os_family: ubuntu
      os_description: ubuntu
      os_version: 12.04
      group: ubuntu
      username: ubuntu
      credential: file:///home/ubuntu/.ssh/id_rsa
    - id: ubuntu3
      hostname: 10.0.1.222
      os_arch: x86_64
      os_family: ubuntu
      os_description: ubuntu
      os_version: 12.04
      group: ubuntu
      username: ubuntu
      credential: file:///home/ubuntu/.ssh/id_rsa

That is it we are now ready for launching our cluster.

Step6: Launch CDH hadoop cluster through whirr

Execute the below command from /home/ubuntu as ubuntu user.

$ whirr launch-cluster --config cdh-whirr.properties

This will take time and finally you should get the confirmation message as below with the URL to access the Namenode status and JobTracker status as below.

With that we have the CDH hadoop cluster launched via Whirr using BYON into Amazon AWS VPC.

Job Tracker

Name Node

TaskTracker

Note: Now you can stop, start instances as need be for any development / testing needs of hadoop cluster.

References:

Part 1: https://cloudkinetics.wordpress.com/2013/02/04/hadoop-cluster-using-whirr-byon-in-aws-vpc/

https://ccp.cloudera.com/display/CDHDOC/Whirr+Installation#WhirrInstallation-Destroyingacluster

https://github.com/jclouds/jclouds/tree/master/apis/byon

Hadoop Cluster using Whirr – BYON in AWS VPC – Part 1

In this article series we will look at the steps in creating a Whirr base instance which will be used to launch the Hadoop cluster over your custom created instances  “using AWS VPC – BYON(Bring Your Own Network)”, ie., on pre-setup machine instances in AWS VPC. In this article we will focus on how to create a Whirr base instance. 

Key challenge in getting a hadoop cluster through Whirr – BYON over Amazon AWS VPC, is that each instance in the Hadoop clusters should have a hostname which is traceable both by forward and reverse dns lookup in their network. Any AWS VPC instance is not assigned with any dns names(only ip address) and is not associated with a local dns.  So we will have to get a local dns server setup in the Whirr base instance and then setup Whirr with Open JDK. In the local dns we will configure the dns names and ip address of instances which we will use for hadoop cluster launch.

Creating Whirr base template with ability to launch BYON.

To start with launch default 12.04.1 ubuntu instance (small)

$ sudo su

Step1: Install DNS Server: bind9

$ apt-get install bind9
$ cd /etc/bind9

Step2: Forward dns lookup setup: db.<dns domain>

Make decision on your local dns name say, “ck.local”. Current machine will be the SOA & NameServer(NS) for the domain. Calling current machine (hostname) as “dc”, meaning dc.ck.local.

Make a copy of the db.local file as db.ck.local

$ cp db.local db.ck.local

Edit and update as below:

With SOA as dc.ck.local & administrator as root.ck.local (instead of root@ck.local)

I wanted to configure 3 more machine in dns other than the current dc.ck.local (10.0.1.80 in my case)

Make the others as node1.ck.local(10.0.1.220), node2.ck.local(10.0.1.221), node3.ck.local(10.0.1.222)

Step3: Reverse Lookup db.<ip address range in reverse>

Now we need to create reverse lookup, copy the db.0 and name it as db.1.0.10 (where all my machines are going to be in the ip ranges of 10.0.1.* and update as below.

Step 4: Include in Name configuration

Next step is to update the bind name configuration to include all these files.

$ vi named.conf.default-zones

update as below, to include both the db.ck.local (instead of the db.local) & update a new entry for db.1.0.10

Step5: Update External DNS forwarder

Now the next update, is to configure the forwarder for the external dns names to the (default dns server for VPC 10.0.0.2)

$ vi named.conf.options

Step6: Update the current machine hostname & nameserver configurations.

In this Ubuntu it is indirectly controlled by dhcp configuration and editing /etc/resolv.conf is the not the right idea.

$ vi /etc/dhcp/dhclient.conf

Update the set host-name to hostname and then uncomment the “supersede domain-name” and update to the chosen domain name, then uncomment the prepend domain-name-servers and update it with the current machine as the dns server “10.0.1.80” (I have updated the vpc dns server[10.0.0.2] which is not really required)

Now make sure the bind9 is part of startup service. I did that using

$ chkconfig bind9 on

If you don’t have the chkconfig install first using apt-get install chkconfig.

$ reboot

Now you have a DNS Server ready.

Step7: Next Step is to get the OpenJDK, Whirr downloaded as below.

Whirr:

$ wget http://apache.techartifact.com/mirror/whirr/stable/whirr-0.8.1.tar.gz

$ tar –xzf whirr-0.8.1.tar.gz

OpenJDK:

Follow the instructions as in

http://www.mkyong.com/java/how-to-install-java-jdk-on-ubuntu-linux/

That is it you are now ready with the Whirr base. Create a Amazon Machine Image(AMI) out of this and should be useful to get a whirr base instance on demand. Next document will give inputs on how to launch a Hadoop cluster via Whirr – BYON service provider.

Reference:

http://aws.amazon.com/vpc

http://whirr.apache.org