Strategies for executing commands in Unix/Linux environments using OpenNMS

1. Remote execution using extend in Net-SNMP
Monitoring server UDP
Observed server
(stateless / unreliable / secured in v3)
process context monitoring application process context - SNMP agent
SNMP Monitor Net-SNMP agent
script
mapping SNMP-OID to
call remote OID SNMP request
command <args []>
command <args[]>
command
Port 161
Test
verify result result
result and values
Service state
Up/Down
created 21.06.2010 – ronny@opennms.org

2. Remote execution using NRPE
Monitoring server TCP
Observed server
(reliable / connection oriented / secured)
process context monitoring application process context - NRPE agent
NRPE Monitor NRPE agent
script
call NRPE describer with args
mapping describer to
call remote
command <args []>
command <args[]>
command
Port 5666
Test
verify result result
result and values
Service state
Up/Down
created 21.06.2010 – ronny@opennms.org

3. Remote execution using Secure Shell
Monitoring server TCP
Observed server
(reliable / connection oriented / secured)
process context monitoring application process context - SSH user
General Purpose Monitor SSH-Server
script
call remote call binary / script
command <args[]>
command
Port 22
Test
verify result result
result and values
Service state
Up/Down
created 21.06.2010 – ronny@opennms.org

4. Remote execution using Secure Shell
extended with code transfer
Monitoring server TCP
Observed server
(reliable / connection oriented / secured)
process context monitoring application process context - SSH user
General Purpose Monitor SSH-Server
script
temp.
copy binary or script transfer binary / script script
call remote call binary / script
command <args[]>
command
Port 22
Test
verify result result
result and values
delete remote
delete binary / script delete
command
script
Service state
Up/Down
created 21.06.2010 – ronny@opennms.org