I'm trying to develop a filebeat module for an Ubuntu 14.04 system running filebeat 7.5.0. I'll soon be developing for an Ubuntu 18 environment, but I'm stuck with 14 for now.
I can't actually develop on the Ubuntu 14 system (can't get docker dependencies there), so I'm developing on an Ubuntu 18 system and installing the results on the Ubuntu 14 system. The version of filebeat for which I'm developing is filebeat 8.0.
Only 1 of 4 filesets is working on the Ubuntu 14/filebeat 7.5.0 system. I'm really struggling to find any meaningful differences between the filesets. Are there known issues between those versions? Maybe regex subtleties, grok changes, etc.?
Thanks in advance.
P.S. I have 2+GB of log files from running in debug mode. Any clues as to where to look for errors would also be greatly appreciated. See here for more details.