Add KARAF_LOG env variable in the setenv comments
# export KARAF_DATA # Karaf data folder
# export KARAF_BASE # Karaf base folder
# export KARAF_ETC # Karaf etc folder
+# export KARAF_LOG # Karaf log folder
# export KARAF_SYSTEM_OPTS # First citizen Karaf options
# export KARAF_OPTS # Additional available Karaf options
# export KARAF_DEBUG # Enable debug mode
