Installation of Cassandra database 

Installation from Debian packages

Add the Apache repository of Cassandra to /etc/apt/sources.list.d/cassandra.sources.list

echo "deb http://www.apache.org/dist/cassandra/debian 36x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list

• Add the Apache Cassandra repository keys:

curl https://www.apache.org/dist/cassandra/KEYS | sudo apt-key add -

Screenshot :-

• Update the repositories:

sudo apt-get update

• Install Cassandra:

sudo apt-get install cassandra   ( if you are installing non-root user)

apt-get install cassandra     ( if you are installing as root user ) 

root :~$apt-get install cassandra

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  ca-certificates-java fontconfig-config fonts-dejavu-core java-common libavahi-client3 libavahi-common-data libavahi-common3
  libcups2 libfontconfig1 libjpeg-turbo8 libjpeg8 liblcms2-2 libnspr4 libnss3 libnss3-nssdb libopts25 libpcsclite1
  libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libxi6 libxrender1 libxtst6 ntp openjdk-8-jre-headless python
  python-minimal python2.7 python2.7-minimal x11-common
Suggested packages:
  cassandra-tools default-jre cups-common liblcms2-utils pcscd ntp-doc libnss-mdns fonts-dejavu-extra fonts-ipafont-gothic
  fonts-ipafont-mincho fonts-wqy-microhei fonts-wqy-zenhei fonts-indic python-doc python-tk python2.7-doc binutils binfmt-support
The following NEW packages will be installed:
  ca-certificates-java cassandra fontconfig-config fonts-dejavu-core java-common libavahi-client3 libavahi-common-data
  libavahi-common3 libcups2 libfontconfig1 libjpeg-turbo8 libjpeg8 liblcms2-2 libnspr4 libnss3 libnss3-nssdb libopts25
  libpcsclite1 libpython-stdlib libpython2.7-minimal libpython2.7-stdlib libxi6 libxrender1 libxtst6 ntp openjdk-8-jre-headless
  python python-minimal python2.7 python2.7-minimal x11-common
0 upgraded, 31 newly installed, 0 to remove and 15 not upgraded.
Need to get 62.9 MB of archives.
After this operation, 167 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
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update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/orbd to provide /usr/bin/orbd (orbd) in auto mode
update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/servertool to provide /usr/bin/servertool (servertool) in auto mode
update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/tnameserv to provide /usr/bin/tnameserv (tnameserv) in auto mode
update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jexec to provide /usr/bin/jexec (jexec) in auto mode
Setting up cassandra (3.6) ...
Adding group `cassandra' (GID 117) ...
Done.
vm.max_map_count = 1048575
net.ipv4.tcp_keepalive_time = 300
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Processing triggers for libc-bin (2.23-0ubuntu9) ...
Processing triggers for systemd (229-4ubuntu21) ...
Processing triggers for ureadahead (0.100.0-19) ...

• Once cassandra is installed using debian package manager it adds a new user cassadra in host. 

       root :~$tail /etc/passwd | grep cass

       cassandra:x:113:117:Cassandra database,,,:/var/lib/cassandra:/bin/false

• Check for Cassandra binaries :-

        root :~$which cassandra
        /usr/sbin/cassandra

• Check cqlsh (client to connect with cassandra) 

       root :~$which cqlsh

       /usr/bin/cqlsh