in init/fluent_bit_init_process.go [362:369]
func openFile(filePath string) *os.File {
file, err := os.OpenFile(filePath, os.O_APPEND|os.O_WRONLY, 0700)
if err != nil {
logrus.Errorln(err)
logrus.Fatalf("[FluentBit Init Process] Unable to read %s\n", filePath)
}
return file
}