증상 Airflow webserver, scheduler가 작동하지 않음 Error log Traceback (most recent call last): File "/home/keti/.local/lib/python3.6/site-packages/lockfile/pidlockfile.py", line 77, in acquire write_pid_to_pidfile(self.path) File "/home/keti/.local/lib/python3.6/site-packages/lockfile/pidlockfile.py", line 161, in write_pid_to_pidfile pidfile_fd = os.open(pidfile_path, open_flags, open_mode) FileExistsEr..