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ServiceNow Certified Implementation
Specialist - Discovery: MID Servers
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MID acronym ✔✔Management, Instrumentation, and Discovery
MID Server ✔✔a java server that runs as a Windows service or Linux daemon & facilitates communication & movement of data between snow & external apps/data sources/services behind a firewall
Applications that use the MID server ✔✔Discovery/Service Mapping/Orchestration/Event Mgmt/Sys Web Svcs/JDBC, LDAP & 3rd party integration
Where the MID Server installed ✔✔Behind the company firewall allowing for communication between ServiceNow & the rest of the company network
Long Polling ✔✔an event driven persistent connection that enables continually querying of the snow instance for probes
MID server communication ✔✔Is secure and initiated using SOAP on HTTPS (port 443) inside the enterprises firewall. No special firewall rules or VPNs are normally required
They only make outbound calls to the snow instance.
How MID servers query ✔✔continuously via long polling: runs & posts the results of probes they've completed back to the instance
data collected by probes is processed by sensors which decide how to proceed
AMB Channel ✔✔Asynchronous Messaging Bus that is continuously available to send/receive messages in a snow instance & enables MID server long polling.
They can be thought of as chat messaging windows that are always open between each MID server & the snow instance.
mid.poll.time ✔✔default MID server poll time interval. set to 40 sec by default & prevents a loss of MID communication should the AMB channel fail
Probe results ✔✔specifics such as runtime and payload viewed in the ECC Queue
access probe definitions ✔✔Discovery Definition > Probes
