How to append kubernetes container id/name to log file in log4j.xml
Your question seems to be in reference to Log4j 1. Log4j 1 has been end-of-life since August of 2015.
Upgrading to Log4j 2.13.0 would allow you to use the Kubernetes Lookup which would allow you to configure your log file name as:
<File name="MyFile" filename="${path}/app_${k8s:containerName}.${date:MM-dd-yyyy}.log> <PatternLayout> <Pattern>%d %p %c{1.} [%t] %m%n</Pattern> </PatternLayout></File>