mount -t nfs -o vers=4.0,proto=tcp,noac,noresvport 10.XX.XX.XX:/ /localfolder

import os
import fcntl

O_WRONLY = os.O_WRONLY  # Open the file in write-only mode
O_APPEND = os.O_APPEND  # Open the file in append mode
O_DIRECT = getattr(os, 'O_DIRECT', 0o40000)  # Attempt to obtain the system's O_DIRECT constant; if it does not exist, set it to the default value 0o40000
SEEK_END = os.SEEK_END  # relative to the end of the file

 # Assume the file for concurrent writes is file1
filename = '/root/cfs/file1' 

try:
    fd = os.open(filename, O_WRONLY | O_APPEND | O_DIRECT)
    
    # Attempt to obtain the file lock
    try:
        fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
        print("Successfully acquired lock")
        
        # Position to the end of the file
        os.lseek(fd, 0, SEEK_END)
        
        # Write data
        data = b"hello world"
        os.write(fd, data)
        
    except BlockingIOError:
        print("File is locked by another process")
        # Exit if the file is locked
        exit(1)
    finally:
        # Release the file lock
        fcntl.flock(fd, fcntl.LOCK_UN)
        print("Lock released")
        
finally:
    if 'fd' in locals():
        os.close(fd)