MetaPackages

Security Onion consists of over 50 packages in a Launchpad PPA. You can install these packages individually or you can install one or more metapackages (groups of packages) depending on what functionality you need.

Metapackages

• securityonion-client (about 525MB)
  Sguil client, Wireshark, NetworkMiner, etc.
  sudo apt-get install securityonion-client

• securityonion-sensor (about 135MB)
  Snort, Suricata, Bro, netsniff-ng, Sguil agents, etc.
  sudo apt-get install securityonion-sensor

• securityonion-server (about 265MB)
  Sguil server, Squert, CapMe, etc.
  sudo apt-get install securityonion-server

• securityonion-elastic (about 5MB)
  Scripts and configuration files for the Elastic Stack (Elasticsearch, Logstash, and Kibana) and its associated log pipeline including syslog-ng. This package includes so-elastic-download which downloads the Docker images for the Elastic stack. You'll probably want to install syslog-ng-core explicitly to replace rsyslog.
  sudo apt-get install securityonion-elastic syslog-ng-core

• securityonion-all (about 930MB)
  all of the above plus syslog-ng
  sudo apt-get install securityonion-all

• securityonion-iso
  all of the above plus bridge-utils, byobu, foremost, pinguybuilder, securityonion-desktop-gnome, securityonion-onionsalt, securityonion-samples-bro, securityonion-samples-markofu, securityonion-samples-mta, securityonion-samples-shellshock, xfsprogs
  sudo apt-get install securityonion-iso