Overview of GRM testing

Required steps for GRM testing

The following table lists the steps required to test GRM.

Step	Action	See...
Verifying the GRM network
1	If you are deploying a GRM DNS server, test the connectivity to the back-end DNS nameserver.	Testing connectivity to the back-end DNS nameserver
2	Verify that all center and edge caches are reporting in to the GRM server.	Verifying that center and edge caches are reporting in
3	Verify that clients in an edge group are directed to an edge cache.	Verifying edge group redirection for a GRM DNS server Verifying edge group redirection for a GRM L7 server
4	Verify that clients from outside configured edge groups are directed to the closest center cache.	Verifying GRM redirection for clients outside of edge groups for a GRM DNS server Verifying GRM redirection for clients outside of edge groups for a GRM L7 server
5	Verify edge group failover.	Verifying edge cache failover for a GRM DNS server Verifying edge cache failover for a GRM L7 server
Verifying GRM client request resolution
6	Verify that CDN clients can receive requested content.	Verifying GRM client request resolution

Using the GRM server access log for test verification

If the GRM server is configured as a DNS server, the GRM server access log provides DNS query information from interactions between DNS nameservers and the GRM server. If the GRM server is configured as an L7 server, the log reports the URL redirection information between the client and the GRM server (client IP address, the requested URL, and the agents to be returned).

You can use the GRM server access log as follows to verify that GRM is functioning as expected:

Use the x-grm-answer field to determine the IP addresses of returned edge and center caches.
Examine the x-grm-method field in the GRM server access log to determine why the GRM server returned each edge cache and center cache.
The x-grm-method header has the following possible values:
- edge: Only an edge cache was returned.
- closest-center: The closest center cache was returned.
- random-center: The proximity was unknown, so a random center cache was returned.

To access the GRM server access log from the Appliance Manager, select Data tab > Log Files > GRM Server.