OpenNMS - blank Resource Graphs page - 413 Requested entity too large
5th July 2014
If you have lots of performance graphs for a node in OpenNMS, sometimes you get a blank page showing them.
Especially when choosing a large time period like Last Month or Last Year.
The reason for a blank page is found in the OpenNMS logfiles.
"413 Requested entity too large"
Just increase the requestHeaderSize in /etc/opennms/opennms.properties
until the graphs show up.
# This sets the request header size for jetty. # The default value is 4000 bytes. #org.opennms.netmgt.jetty.requestHeaderSize=4000