Nginx Failed to Start with Error "unknown "sensor_mod_idx" variable"
CB Response 6.1
Nginx failed to startup with error "nginx: [emerg] unknown "sensor_mod_idx" variable".
nginx: [emerg] unknown "sensor_mod_idx" variable
The root cause of the upgrade failure was determined to be an issue with the home directory of the cb service account being changed to a custom location (which worked in 5.1). In 6.1, server code is dependent upon the default location to fetch run-time configuration items for NGINX. This is being tracked as a documentation bug which explains these requirements: CBDOX-113.
If using a multihome configuration (signed cert), follow this guide to migrate to the latest 5.2/6.1 cb.multihome format: