How to Install Cassandra in CentOS
To Install Cassandra in CentOS
Apache Cassandra is a highly scalable database management system that used to manage very large amounts of structured data. It can able to perform on multi-node setups. The Cassandra supports relational databases including MySQL, PostgreSQL and Microsoft SQL. Installation of Cassandra in CentOS is explained in this manual.
Installation of Cassandra
Utilize the java-version command to check whether your server already has Java or not.
If you are not installed Java, then install a stable version Java 7.
To install Java package
Run the following command to install Java package.
[root@linuxhelp ~]# yum -y install java
Loaded plugins: fastestmirror, langpacks
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
base | 3.6 kB 00:00:00
extras | 3.4 kB 00:00:01
mariadb | 2.9 kB 00:00:00
updates | 3.4 kB 00:00:00
(1/3): mariadb/primary_db | 18 kB 00:00:01
(2/3): extras/7/x86_64/primary_db | 166 kB 00:00:02
(3/3): updates/7/x86_64/primary_db | 9.1 MB 00:01:44
Determining fastest mirrors
* base: centos.excellmedia.net
* extras: centos.excellmedia.net
* updates: centos.excellmedia.net
Resolving Dependencies
--> Running transaction check
---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.101-3.b13.el7_2 will be updated
---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.111-1.b15.el7_2 will be an update
--> Processing Dependency: java-1.8.0-openjdk-headless = 1:1.8.0.111-1.b15.el7_2 for package: 1:java-1.8.0-openjdk-1.8.0.111-1.b15.el7_2.x86_64
.
.
.
Updated:
java-1.8.0-openjdk.x86_64 1:1.8.0.111-1.b15.el7_2
Dependency Updated:
java-1.8.0-openjdk-headless.x86_64 1:1.8.0.111-1.b15.el7_2
Complete!
Add the DataStax Community Repository.
[root@linuxhelp ~]# vim /etc/yum.repos.d/datastax.repo
[datastax]
name = DataStax Repo for Apache Cassandra
baseurl = http://rpm.datastax.com/community
enabled = 1
gpgcheck = 0
Exit and save the file with the :wq command.
Now its time to install Apache Cassandra.
[root@linuxhelp ~]# yum -y install dsc20
Loaded plugins: fastestmirror, langpacks
datastax | 2.5 kB 00:00:00
datastax/primary_db | 131 kB 00:00:02
Loading mirror speeds from cached hostfile
* base: centos.excellmedia.net
* extras: centos.excellmedia.net
* updates: centos.excellmedia.net
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
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.
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Installed:
dsc20.noarch 0:2.0.17-1
Dependency Installed:
cassandra20.noarch 0:2.0.17-1
Complete!
Once the installation is completed, start the Cassandra.
[root@linuxhelp ~]# systemctl start cassandra
Use the following command to check the Cassandra service status
[root@linuxhelp ~]# systemctl status cassandra cassandra.service - SYSV: Starts and stops Cassandra Loaded: loaded (/etc/rc.d/init.d/cassandra) Active: active (exited) since Fri 2016-11-18 00:23:52 IST 38s ago Docs: man:systemd-sysv-generator(8) Process: 18758 ExecStart=/etc/rc.d/init.d/cassandra start (code=exited, status=0/SUCCESS) Nov 18 00:23:52 linuxhelp systemd[1]: Starting SYSV: Starts and stops Cassandra... Nov 18 00:23:52 linuxhelp su[18765]: (to cassandra) root on none Nov 18 00:23:52 linuxhelp cassandra[18758]: Starting Cassandra: OK Nov 18 00:23:52 linuxhelp systemd[1]: Started SYSV: Starts and stops Cassandra.
Enable it to Start at Boot.
[root@linuxhelp ~]# systemctl enable cassandra
cassandra.service is not a native service, redirecting to /sbin/chkconfig.
Executing /sbin/chkconfig cassandra on
Now enter the Cassandra in command line
[root@linuxhelp ~]# cqlsh
Connected to Test Cluster at localhost:9160.
[cqlsh 4.1.1 | Cassandra 2.0.17 | CQL spec 3.1.1 | Thrift protocol 19.39.0]
Use HELP for help.
cqlsh>
cqlsh> exit
Use the following command to check the Cassandra node status.
[root@linuxhelp ~]# 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 46.09 KB 256 100.0% da0e85b0-6e66-4de9-8f53-4ed15136dedb rack1
Once the above process is completed, restart Cassandra with following command.
[root@linuxhelp ~]# systemctl restart cassandra
The below command helps to shutdown Cassandra.
[root@linuxhelp ~]# systemctl stop cassandra
Q
What is the cluster in Cassandra?
A
A node is a single machine that runs Cassandra. A collection of nodes holding similar data are grouped in what is known as a "ring" or cluster.
Q
What are seed nodes in Apache Cassandra?
A
The seed node designation has no purpose other than bootstrapping the gossip process for new nodes joining the cluster. Seed nodes are not a single point of failure, nor do they have any other special purpose in cluster operations beyond the bootstrapping of nodes.
Q
How to install Cassandra in ubuntu?
A
Follow this link for the installation of Cassandra on Ubuntu https://www.linuxhelp.com/how-to-install-apache-cassandra-in-ubuntu/
Q
how to install Cassandra in Linux Mint?
A
For installing Cassandra in Linux Mint use the following link https://www.linuxhelp.com/how-to-install-apache-cassandra-on-linux-mint-18-3/ "
Q
What are the alternatives available for Cassandra?
A
There are tools like MySQL Community Edition, PostgreSQL, MariaDB are similar to Apache Cassandra.