Python的 '子' CalledProcessError：命令 '[...]' 返回非零退出状态1

执行下面的脚本...Python的 '子' CalledProcessError：命令 '[...]' 返回非零退出状态1

import socket     
import sys       

from collections import OrderedDict 
from subprocess import check_output 
from threading import Thread

[...]

class IpCheck(Thread): 

    RECEIVED_PACKAGES_RE = re.compile(r'(\d+) received') 

    def __init__(self, ip):       
     Thread.__init__(self) 
     self.ip = ip 
     self.result = None 

    def run(self):       
     match = self.RECEIVED_PACKAGES_RE.search(
      check_output(['ping', '-q', '-c2', '-W1', self.ip]) 
     ) 

     successful_ping_count = int(match.group(1)) if match else 0 

     if successful_ping_count == 0: 
      self.result = 'no response' 
     elif successful_ping_count == 1: 
      self.result = 'alive, but 50% package loss' 
     elif successful_ping_count == 2: 
      self.result = check_snmp(self.ip) 
     else: 
      assert False 

[...]

...导致一个错误：

CalledProcessError: Command '[ping', '-q', '-c2', '-W1', '10.81.3.80 ']' returned non-zero exit status 1

在check_output添加“标准错误= STDOUT”没有产生任何有用的反馈。

如何获取有关错误的更多信息以便我可以排除故障？

来源

2015-10-05 Chpo7234

subprocess.check_output引发CalledProcessError看看上非零退出代码，ping返回非零退出代码，如果事情是错误的（如未知的域名或网站关闭，或现场已经封锁ICMP一些原因或您的Internet连接断开）。

如果你想检查输出和退出代码，使用subprocess.Popen：

import subprocess 
import sys 

site = sys.argv[1] 
ping_count = 4 
process = subprocess.Popen(['ping', site, '-c', str(ping_count)], 
          stdout=subprocess.PIPE, 
          stderr=subprocess.STDOUT) 
returncode = process.wait() 
print('ping returned {0}'.format(returncode)) 
print(process.stdout.read())

例子：

$ python ping.py google.com   <-- ping successful 
ping returned 0 
PING google.com (195.64.213.27) 56(84) bytes of data. 
64 bytes from cache.google.com (195.64.213.27): icmp_seq=1 ttl=57 time=59.8 ms 
64 bytes from cache.google.com (195.64.213.27): icmp_seq=2 ttl=57 time=2.43 ms 
64 bytes from cache.google.com (195.64.213.27): icmp_seq=3 ttl=57 time=77.0 ms 
64 bytes from cache.google.com (195.64.213.27): icmp_seq=4 ttl=57 time=43.8 ms 

--- google.com ping statistics --- 
4 packets transmitted, 4 received, 0% packet loss, time 3004ms 
rtt min/avg/max/mdev = 2.439/45.802/77.096/27.658 ms 

$ python ping.py asdasdas.com  <-- DNS resolved, but site is down 
ping returned 1 
PING asdasdas.com (69.172.201.208) 56(84) bytes of data. 

--- asdasdas.com ping statistics --- 
4 packets transmitted, 0 received, 100% packet loss, time 3024ms 

$ python ping.py asdasdasdasda.com <-- DNS failed 
ping returned 2 
ping: unknown host asdasdasdasda.com

来源

2015-10-05 06:37:31 alexanderlukanin13

由于您的错误消息说，ping完成非零退出状态。这可能意味着例如所提供的IP地址不可访问，或者您传递了错误的参数。

从ping手册页（http://linux.die.net/man/8/ping）：

If ping does not receive any reply packets at all it will exit with code 1. If a packet count and deadline are both specified, and fewer than count packets are received by the time the deadline has arrived, it will also exit with code 1. On other error it exits with code 2. Otherwise it exits with code 0. This makes it possible to use the exit code to see if a host is alive or not.

你可以试着抓住CalledProcessError，看看它包含output。这里https://docs.python.org/2/library/subprocess.html#subprocess.check_output

来源

2015-10-05 06:10:40

Python的 '子' CalledProcessError：命令 '[...]' 返回非零退出状态1

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