Fortanix DSM for Adding SNMP Trap Handler on Sensu Server

1.0 Introduction

The purpose of this guide is to describe procedure to add a Simple Network Management Protocol (SNMP) trap handler to forward the traps from Sensu virtual machine (VM) to an SNMP Server.

2.0 Terminology References

• SNMP - Simple Network Management Protocol

• TCP -  Transport Layer Security

• UDP - User Datagram Protocol

3.0 Prerequisites

Before proceeding with the SNMP handler configuration, ensure the following:

• The Sensu server is already set up and monitoring the Fortanix DSM targets.

• The SNMP server is properly configured.

• The Sensu VM has network connectivity to the SNMP server over the required TCP or UDP ports.

3.1 List of Required Ports

The following ports must be accessible from the Sensu VM to the SNMP server (one way):

4.0 Configure SNMP Trap Handler on Sensu VM

This section explains how to configure the SNMP trap handler on the Sensu VM for forwarding alerts to the SNMP server.

4.1 Setting Up SNMP Asset

Perform the following steps:

1. Run the following command to navigate to the Monitoring-Server-Artifacts folder on the Sensu VM created in Section 5.1 of Fortanix DSM with Sensu Monitoring and Alerting:

   cd Monitoring-Server-Artifacts

2. Run the following command to execute the add_handlers.sh script to add an SNMP handler:

   ./add_handlers.sh

   When prompted, select Y for SNMP handler:

   ./add_handlers.sh
   Do you want to create email handler ? (Y/N): N
   Do you want to create snmp-trap handler ? (Y/N): Y
   Creating SNMP trap handler
   Specify the snmp host : <SNMP_HOST_IP>
   Specify the snmp port: <SNMP_HOST_PORT>

3. Run the following command to check the SNMP trap handler asset details:

   sensuctl asset info sensu-snmp-trap-handler

   The output may resemble as follows:

   === sensu-snmp-trap-handler
   Name:  sensu-snmp-trap-handler
   Namespace: default
   URL: http://10.197.188.16/sensu-snmp-trap-handler_0.2.2_linux_amd64.tar.gz
   SHA-512 Checksum: c350ec73cee0a38fbe05e8a11e217aae4cc77ced1f2f1c8ba31d287005e34e7f33b09850a4c810d6f1e0309cc569c7ae6ddfd686313e06aa73b2e44b885da61f
   Filters: entity.system.os == 'linux', entity.system.arch == 'amd64'

4. Verify the SNMP handler configuration from Sensu Web user interface (UI):

   

   

4.2 Verification of SNMP Traps

Verify the SNMP traps are received on the SNMP server:

tcpdump -i any src host <snmp-server-ip> -vv

The Sensu SNMP traps are received in the following format:

5.0 Configure Keepalive Handler

This section explains how the keepalive handler monitors the status of the sensu-agent service on each node.

5.1 Configure Keepalive Handler on Sensu VM

Perform the following steps on the Sensu VM:

1. Run the following command to navigate to the Monitoring-Server-Artifacts folder in the Sensu VM created in Section 5.1 of Fortanix DSM with Sensu Monitoring and Alerting:

   cd Monitoring-Server-Artifacts

2. Run the following command to create the keepalive-handler.yml file:

   vi keepalive-handler.yml

3. Add the following configuration to the keepalive-handler.yml file:

   type: Handler
   api_version: core/v2
   metadata:
     name: keepalive
     namespace: default
   spec
     handlers:
     - snmp-handler
     type: set
     filters:
     - is_incident
     - not_silenced

4. Run the following command to create the keepalive handler:

   sensuctl create -f keepalive-handler.yml

5. Run the following commands to start and enable the sensu-agent service:

   sudo systemctl daemon-reload
   sudo systemctl restart sensu-agent

6. Run the following command to check the status of the sensu-agent service:

   sudo systemctl status sensu-agent

5.2 Configuration Changes on Fortanix DSM Node

Perform the following steps on each Fortanix DSM node where the sensu-agent service is configured:

1. Add the following values in the agent.yaml file present in the /etc/sensu/ directory:

   keepalive-warning-timeout: 60
   keepalive-critical-timeout: 90

2. Run the following commands to restart the sensu-agent service:

   sudo systemctl daemon-reload
   sudo systemctl restart sensu-agent
   sudo systemctl status sensu-agent

5.3 Verification of SNMP Traps

Run the following command to verify that SNMP traps are being received on the SNMP server:

tcpdump -i any src host <snmp-server-ip> -vv

The SNMP traps in Sensu appears in the following format: