This is a text-only version of the following page on https://raymii.org: --- Title : Uninstall and Remove OSSEC Author : Remy van Elst Date : 01-10-2013 URL : https://raymii.org/s/tutorials/Uninstall_OSSEC.html Format : Markdown/HTML --- OSSEC is an Open Source Host-based Intrusion Detection System that performs log analysis, file integrity checking, policy monitoring, rootkit detection, real- time alerting and active response. It runs on most operating systems, including Linux, MacOS, Solaris, HP-UX, AIX and Windows. It also includes agentless monitoring for use with for example Cisco or Juniper hardware.

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[If you are looking for an OSSEC installation tutorial, check this link. It covers the OSSEC client and server install, and includes MySQL support plus an awesome dashboard][2] This tutorial covers the removal of OSSEC, both the client or the server install type. Because OSSEC is installed from source, you don't have all the nice package management options. You have to remove all the things manually, that is, all the ossec files, the init files, the ossec users and ossec groups. The following shell commands do that: sudo rm -f /etc/init.d/ossec /etc/rc0.d/K20ossec /etc/rc1.d/K20ossec /etc/rc2.d/S20ossec /etc/rc3.d/S20ossec /etc/rc4.d/S20ossec /etc/rc5.d/S20ossec /etc/rc6.d/K20ossec; sudo rm -rf /var/ossec; sudo /usr/sbin/deluser ossec; sudo /usr/sbin/deluser ossecm; sudo /usr/sbin/deluser ossecr; sudo /usr/sbin/deluser ossecd; sudo /usr/sbin/delgroup ossec; sudo /usr/sbin/delgroup ossecd; Here is all that in a nice one line copy command: sudo rm -f /etc/init.d/ossec /etc/rc0.d/K20ossec /etc/rc1.d/K20ossec /etc/rc2.d/S20ossec /etc/rc3.d/S20ossec /etc/rc4.d/S20ossec /etc/rc5.d/S20ossec /etc/rc6.d/K20ossec; sudo rm -rf /var/ossec; sudo /usr/sbin/deluser ossec; sudo /usr/sbin/deluser ossecm; sudo /usr/sbin/deluser ossecr; sudo /usr/sbin/deluser ossecd; sudo /usr/sbin/delgroup ossec; sudo /usr/sbin/delgroup ossecd Using Chef to deploy OSSEC and want to remove it from all nodes? Another handy one liner: knife ssh -a ipaddress -x [SSH USERNAME] -c ~/path/to/knife.rb 'name:*' 'sudo rm -f /etc/init.d/ossec /etc/rc0.d/K20ossec /etc/rc1.d/K20ossec /etc/rc2.d/S20ossec /etc/rc3.d/S20ossec /etc/rc4.d/S20ossec /etc/rc5.d/S20ossec /etc/rc6.d/K20ossec; sudo rm -rf /var/ossec; sudo /usr/sbin/deluser ossec; sudo /usr/sbin/deluser ossecm; sudo /usr/sbin/deluser ossecr; sudo /usr/sbin/deluser ossecd; sudo /usr/sbin/delgroup ossec; sudo /usr/sbin/delgroup ossecd' Using Ansible? Here you go: ansible all -s -k -a "sudo rm -f /etc/init.d/ossec /etc/rc0.d/K20ossec /etc/rc1.d/K20ossec /etc/rc2.d/S20ossec /etc/rc3.d/S20ossec /etc/rc4.d/S20ossec /etc/rc5.d/S20ossec /etc/rc6.d/K20ossec; sudo rm -rf /var/ossec; sudo /usr/sbin/deluser ossec; sudo /usr/sbin/deluser ossecm; sudo /usr/sbin/deluser ossecr; sudo /usr/sbin/deluser ossecd; sudo /usr/sbin/delgroup ossec; sudo /usr/sbin/delgroup ossecd" [1]: https://www.digitalocean.com/?refcode=7435ae6b8212 [2]: https://raymii.org/s/tutorials/OSSEC_and_webui_and_analogi_dashboard_installation_on_Ubuntu.html --- License: All the text on this website is free as in freedom unless stated otherwise. This means you can use it in any way you want, you can copy it, change it the way you like and republish it, as long as you release the (modified) content under the same license to give others the same freedoms you've got and place my name and a link to this site with the article as source. This site uses Google Analytics for statistics and Google Adwords for advertisements. You are tracked and Google knows everything about you. Use an adblocker like ublock-origin if you don't want it. All the code on this website is licensed under the GNU GPL v3 license unless already licensed under a license which does not allows this form of licensing or if another license is stated on that page / in that software: This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Just to be clear, the information on this website is for meant for educational purposes and you use it at your own risk. I do not take responsibility if you screw something up. Use common sense, do not 'rm -rf /' as root for example. If you have any questions then do not hesitate to contact me. See https://raymii.org/s/static/About.html for details.