Cassandra for Oracle DBA’s Part 6 – Installing Cassandra

Installing Cassandra is straight forward, With CCM, is a tool to simulate a Cassandra cluster in a single host, Ideal for test environments or you want to make your hands on in Cassandra.

Further to install Cassandra in production size, you can directly download the Cassandra from Apache.org or Datastax for an enterprise version.

I cover here both of these methods.

For CCM Installation,

Step 1: Upgrade Python to 2.7 (this is must for ccm based installations also we have to do alternate install for python to upgrade 2.7 if not this will break your libraries.)

   cd /usr/src

   wget https://www.python.org/ftp/python/2.7.10/Python-2.7.10.tgz

   tar xzf Python-2.7.10.tgz

  cd Python-2.7.10

  ./configure

  make altinstall

  ls -ltr /usr/bin/python*

  ls -ltr /usr/local/bin/python*

  ln -s /usr/local/bin/python2.7 /usr/local/bin/python

  ln -s /usr/local/bin/python2.7 /usr/local/bin/python

  wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py

  sudo /usr/local/bin/python2.7 ez_setup.py

  sudo /usr/local/bin/easy_install-2.7 pip

  sudo easy_install six

  sudo easy_install pyyaml

Step 2: Download the CCM Package from Git hub

git clone https://github.com/pcmanus/ccm.git

or

pip install ccm

change the setup.py to point to /usr/local/bin/python instead of /usr/bin/env python (this is important if not CCM will not work)

cd ccm; sudo ./setup.py install; cd ..

Step 3: Creating a CCM cluster for DSE stack (this command only download the Cassandra to the directory you are running into)

ccm create --version 1.2.0 --nodes 3 --start test

or 

ccm create dse_cluster --dse --dse-username=emaildi --dse-password=password -v 4.5.2 -n 3 -s

Step 4: Verify the installation

root@wash-i-16ca26c8-prod ~/.ccm/repository/4.5.2/resources/cassandra/conf $ ccm node4 nodetool ring

Note: Ownership information does not include topology; for complete information, specify a keyspace

Datacenter: Cassandra

==============

Address    Rack        Status State   Load            Owns                Token

127.0.0.1  rack1       Up     Normal  3.05 MB         33.33%              -9223372036854775808

127.0.0.2  rack1       Up     Normal  2.99 MB         33.33%              -3074457345618258603

127.0.0.3  rack1       Up     Normal  3.5 MB          33.33%              3074457345618258602

Installing Cassandra Cluster Manually on each of the node

Step 1: Downloading and Installing Cassandra

sudo su - cassandra

wget http://mirrors.ae-online.de/apache/cassandra/2.1.3/apache-cassandra-2.1.3-bin.tar.gz

sudo tar -xvf /home/cassandra/apache-cassandra-2.1.3-bin.tar.gz -C /usr/local/

cd /usr/local/

sudo mv apache-cassandra-2.1.3 cassandra-2.1.3

sudo ln -s /usr/local/cassandra-2.1.3 /usr/local/cassandra

sudo chown -R cassandra:cassandra /usr/local/cassandra-2.1.3

xport JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::")

export CASSANDRA_INSTALL=/usr/local/cassandra

export CASSANDRA_HOME=$CASSANDRA_INSTALL

Just edit the $CASSANDRA_HOME/conf/cassandra.yaml file vim $CASSANDRA_HOME/conf/cassandra.yaml and replace the following keys with proper values:

cluster_name: 'MyFirstCluster'

seeds: "10.64.200.47, 10.64.200.48"

listen_address: 10.64.200.47

rpc_address: 10.64.200.47

Note: Seeds address are those nodes performing as seed, Listen and RPC address should be the node IP which you have installed.

Step 2: Start Cassandra on all nodes

$CASSANDRA_HOME/bin/cassandra -f

Step 3: Check status of cluster

$CASSANDRA_HOME/bin/nodetool status

-Thanks

Geek DBA