Migrating OSSEC agent installed from packages

1. Backup your current configuration

Stop OSSEC:

# /var/ossec/bin/ossec-control stop

Check if you have enough space to create a copy of /var/ossec:

# du -h /var/ossec | tail -n1
# df -h /var

Backup /var/ossec:

# cp -rp /var/ossec /var/ossec_backup

2. Remove your current installation

Debian and Ubuntu:

# apt-get remove ossec-hids-agent --purge

CentOS and Red Hat:

# yum remove ossec-hids-agent

Remove directory:

# rm -rf /var/ossec

3. Install Wazuh agent

Follow the next guide in order to install Wazuh agent:

• Install Wazuh agent with RPM packages

• Install Wazuh agent with Deb packages

4. Restore configuration

Stop OSSEC:

# systemctl stop wazuh-agent

Restore files:

# cp -p /var/ossec_backup/etc/ossec.conf /var/ossec/etc/ossec.conf.orig
# cp -p /var/ossec_backup/etc/local_internal_options.conf /var/ossec/etc/local_internal_options.conf
# cp -p /var/ossec_backup/etc/client.keys /var/ossec/etc/
# cp -p /var/ossec_backup/queue/rids/* /var/ossec/queue/rids/

5. Review ossec.conf

The previous configuration file is saved as /var/ossec/etc/ossec.conf.orig. You should review the new configuration file /var/ossec/etc/ossec.conf with the old one in case that you want to add some setting from the previous configuration.

Do not forget to restore the IP of the manager:

/var/ossec/etc/ossec.conf

<ossec_config>
  <client>
    <server-ip>MANAGER_IP</server-ip>

6. Start Wazuh

# /var/ossec/bin/ossec-control start