Learn step by step process, how to install Cassandra in CentOS 6.5 or 7. Apache Cassandra installation on CentOS Linux OS.
Apache Cassandra is a NoSQL database intended for storing large amounts of data in a decentralized, highly available cluster. NoSQL refers to a database with a data model other than the tabular relations used in relational databases such as MySQL, PostgreSQL, and Microsoft SQL.
1. Pre-requisite to install Cassandra in CentOS
Stable version of Oracle/Sun Java 7 or higher version installed . Check to see if your server already has Java installed by running the following command:
java -version
2. Add the DataStax Community Repository
Add datastax Cassandra repo to install Apache Cassandra ( DataStax community edition)
vim /etc/yum.repos.d/datastax.repo
Add the following information to the file you’ve created, using i to insert:
[datastax] name = DataStax Repo for Apache Cassandra baseurl = http://rpm.datastax.com/community enabled = 1 gpgcheck = 0
Then exit and save the file with the command :wq
3. Install Apache Cassandra 2 CentOS Linux
Installing Cassandra is as simple as running just one command:
yum -y install dsc20
Console Output for installation of Cassandra
You should see something similar to following
[root@ranjeet ~]# yum -y install dsc20 Loaded plugins: fastestmirror Determining fastest mirrors epel/metalink | 4.3 kB 00:00 * base: centosmirror.go4hosting.in * epel: ftp.riken.jp * extras: centosmirror.go4hosting.in * updates: centosmirror.go4hosting.in base | 3.7 kB 00:00 datastax | 2.5 kB 00:00 datastax/primary_db | 130 kB 00:01 epel | 4.3 kB 00:00 epel/primary_db | 5.9 MB 00:04 extras | 3.4 kB 00:00 extras/primary_db | 37 kB 00:00 mongodb-org-3.2 | 2.5 kB 00:00 mongodb-org-3.2/primary_db | 45 kB 00:00 updates | 3.4 kB 00:00 updates/primary_db | 2.0 MB 00:01 Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package dsc20.noarch 0:2.0.17-1 will be installed --> Processing Dependency: cassandra20 = 2.0.17 for package: dsc20-2.0.17-1.noarch --> Running transaction check ---> Package cassandra20.noarch 0:2.0.17-1 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================== Package Arch Version Repository Size ============================================================================================================================== Installing: dsc20 noarch 2.0.17-1 datastax 1.9 k Installing for dependencies: cassandra20 noarch 2.0.17-1 datastax 17 M Transaction Summary ============================================================================================================================== Install 2 Package(s) Total download size: 17 M Installed size: 20 M Downloading Packages: (1/2): cassandra20-2.0.17-1.noarch.rpm | 17 MB 00:11 (2/2): dsc20-2.0.17-1.noarch.rpm | 1.9 kB 00:00 ------------------------------------------------------------------------------------------------------------------------------ Total 1.4 MB/s | 17 MB 00:12 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Warning: RPMDB altered outside of yum. Installing : cassandra20-2.0.17-1.noarch 1/2 Installing : dsc20-2.0.17-1.noarch 2/2 Verifying : cassandra20-2.0.17-1.noarch 1/2 Verifying : dsc20-2.0.17-1.noarch 2/2 Installed: dsc20.noarch 0:2.0.17-1 Dependency Installed: cassandra20.noarch 0:2.0.17-1 Complete!
3. Get Cassandra Running
Start-Up Cassandra
systemctl start cassandra or service cassandra start
Check Cassandra Service Status
systemctl status cassandra or service cassandra status
check CQL
cqlsh
The cqlsh interface should look similar to:
Connected to Test Cluster at localhost:9160. [cqlsh 4.1.1 | Cassandra 2.0.10 | CQL spec 3.1.1 | Thrift protocol 19.39.0] Use HELP for help. cqlsh>
Check Cassandra Node Status
nodetool status
[root@ranjeet ~]# service cassandra status cassandra is stopped [root@ranjeet ~]# service cassandra start Starting Cassandra: OK [root@ranjeet ~]# nodetool status Datacenter: datacenter1 ======================= Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack UN 127.0.0.1 46.18 KB 256 100.0% 4cfd1047-75c9-403f-ac15-8f00b4636fd1 rack1 [root@ranjeet ~]#
If you get an error such as: ‘Failed to connect to ’127.0.0.1:7199′: Connection refused’
vim /etc/cassandra/default.conf/cassandra-env.sh
change following line in /etc/cassandra/default.conf/cassandra-env.sh , to your
# add this if you’re having trouble connecting: # JVM_OPTS=”$JVM_OPTS -Djava.rmi.server.hostname=”
Restart Cassandra
service cassandra restart
Shutdown Cassandra
service cassandra stop
okey