Python，fping，cron

Question

我最近在Python中编写了一个程序（首先用这种语言进行攻击）从数据库中获取IP地址，使用fping对它们进行ping操作并将响应时间返回到所述数据库中。应用程序在命令行中运行良好，但从crontab

中断

非常感谢任何帮助。感谢

PYTHON CODE - 我从互联网中获得了大部分内容

#!/usr/bin/env python
import MySQLdb as mdb;
import threading
import shlex  
from subprocess import Popen, PIPE, STDOUT
import subprocess

con = mdb.connect('localhost', '*****', '*****', '*****')

class myThread(threading.Thread):
    def __init__(self, ip_list):
        threading.Thread.__init__(self)
        self.ip_list = ip_list
    def run(self):
    get_ping(self.ip_list)

def get_simple_cmd_output(cmd):
    args = shlex.split(cmd)
    return Popen(args, stdout=PIPE, stderr=subprocess.STDOUT, shell=False).communicate()[0]

def get_ping(ip_list):
    ip_response_dict = {}
    cmd = "fping -C 4 -q {host}".format(host=" ".join(ip_list))
    for x in get_simple_cmd_output(cmd).strip().split(' : ', 0) :
        lines = x.split("\n")
        for line in lines:
            if line.upper().find(":", 0) > 0:
                ip_data = line.split(":")
                ip_address = ip_data[0].strip()
                ip_response = ip_data[1].strip().split(" ")
                total = 0;
                length = 0;
                for ping_time in ip_response:
                    if ping_time != '' and ping_time != '-':
                        total += float(ping_time)
                        length += 1
                if total > 0 and length > 0:
                    ip_response_dict[ip_address] = (total / length)
                else:
                    ip_response_dict[ip_address] = 0
    save_ping_times(ip_response_dict)

def save_ping_times(ip_list):
    cursor = con.cursor()
    for key, value in ip_list.items():
        cursor.execute('INSERT INTO `Tech_AP_Ping_Time`(`IP_Address`,`Value`) VALUES ("' + key + '","' + str(round(value, 2)) + '")')
    con.commit()

threads = []
chunk_length = 100

with con:
    cur = con.cursor(mdb.cursors.DictCursor)
   cur.execute("SELECT `IP_Address` FROM `Tech_APs` WHERE (`IP_Address` IS NOT NULL AND `IP_Address` != '') ORDER BY `IP_Address`")
    rows = cur.fetchall()
    i = 0
    ip_list = []
    for row in rows:
        ip_list.append(row['IP_Address'])

ip_list = [ip_list[i : i + chunk_length] for i in range(0, len(ip_list), chunk_length)]

for ip_chunk in ip_list:
    thread = myThread(ip_chunk)
    thread.start()
    threads.append(thread)

CRON COMMAND - 是的，我有一个完整的路径来设置我实际的cron中设置的脚本

*/5 * * * * /usr/bin/python distro_pinger.py

错误 - 我从cron运行时得到这个

Exception in thread Thread-1:
Traceback (most recent call last):
    File "/usr/lib64/python2.6/threading.py", line 532, in __bootstrap_inner
    self.run()
  File "/var/www/html/poller/distro_pinger.py", line 15, in run
    get_ping(self.ip_list)
  File "/var/www/html/poller/distro_pinger.py", line 25, in get_ping
    for x in get_simple_cmd_output(cmd).strip().split(' : ', 0) :
  File "/var/www/html/poller/distro_pinger.py", line 19, in get_simple_cmd_output
    return Popen(['fping','-C','4','-q','','127.0.0.1'], stdout=PIPE, stderr=subprocess.STDOUT, shell=False).communicate()[0]
  File "/usr/lib64/python2.6/subprocess.py", line 639, in __init__
    errread, errwrite)
  File "/usr/lib64/python2.6/subprocess.py", line 1228, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

任何帮助都将非常感谢。 （即使你告诉我我做错了一切：P）

Answer 1

安装了哪个用户fping？是否为同一用户设置了crontab？如果没有，crontab设置所在的用户是否具有fping目录的权限？

Answer 2

尝试在脚本中添加fping的完整路径。这应该可以解决问题。