Python real-Combat series of batch host ping Network test (07)

1. Requirements Description

working environment, often use to ping network on the host to do network testing, such as the machine shelves, offline, testing and other needs, for a large number of machines, one by one host ping test, obviously difficult to meet the requirements, for the machine more than the scene, The IP address that needs to perform the ping test can be stored in a file, and it is convenient and convenient to invoke the script to perform the network test.

2. Program Contents

vim ping.py #!/usr/bin/env python#_*_ coding:utf8 _*_#author: happy# from Happy test test The  http://happylab.blog.51cto.com# script is primarily used to ping the test import reimport subprocessdef check_alive (IP, count=1,timeout=1):         "         ping network test, by calling the ping command, send an ICMP packet, from the results through the regular match whether there are 100% keywords, there is the loss of packets, none of the normal           '         cmd =  ' ping -c %d  -w %d %s '  %  (COUNT,TIMEOUT,IP)         p  = subprocess. Popen (cmd,                 Stdin=subprocess. pipe,                stdout= Subprocess. Pipe,              &nbSp; stderr=subprocess. Pipe,                shell= true        )         result  = p.stdout.read ()         regex = re.findall (' 100%  packet loss ', result)         if len (regex)  ==  0:                print   "\033[31m%s up\033[0m"  %  (IP)         else:                 print  "\033[32m %s down\033[0m " %  (IP) if __name__ == " __main__ ":         with file ('/root/ip.txt ', ' R ')  as f:      &nbsP;         for line in f.readlines ():                          ip = line.strip ()                          check_alive (IP)           #执行函数功能调用

3. Test results

Python ping.py 10.16.2.4 DOWN10.16.2.5 DOWN10.16.4.16 UP10.16.4.30 UP10.16.4.61 UP10.16.4.65 UP10.16.4.66 UP10.16.4.68 UP10.16.4.74 UP10.16.4.76 UP10.16.4.77 up

4. About subprocess Module Learning

In Python, there are three main ways to invoke commands in the shell: 1. Os.system (), 2. commands modules, 3.subprocess modules, methods are different.

1.os.system (), call system command, get command output and accept return code

>>> import os>>> os.system (' df -h ') filesystem             size  used avail use% mounted on /dev/sda2             9.9g  7.3g   2.2G  78% /tmpfs                  3.9g  4.0k  3.9g   1% /dev/shm/dev /sda1            1008m   82m   876M   9% /boot/dev/sda4              899g   36g  818g   5% /data110.16.2.8:openstack _glances                       899G   37G  816G   5% /var/lib/glance/images0>> > result = os.system (' df -h ')     #保存返回值Filesystem              size  used avail use% mounted on /dev/sda2             9.9g  7.3g   2.2G  78% /tmpfs                  3.9g  4.0k  3.9g   1% /dev/shm/dev /sda1            1008m   82m   876M   9% /boot/dev/sda4              899g   36g  818g   5% /data110.16.2.8:openstack _glances                       899g   37g  816g   5% /var/lib/glance/images >>> print result0

2.cmmands module

>>> import commands# get command output result >>> commands.getoutput (' df -h ')   ' filesystem            size  used  avail use% mounted on\n/dev/sda2              9.9G  7.3G  2.2G  78% /\ntmpfs                  3.9G  4.0K   3.9g   1% /dev/shm\n/dev/sda1             1008M   82M  876M   9% /boot\n/dev/sda4              899g   36g  818g    5% /data1\n10.16.2.8:openstack_glances\n                       899g   37g  816g    5% /var/lib/glance/images ' #得到命令输出结果和返回码, showing >>> commands.getstatusoutput (' DF ' in the form of a tuple  -h ') (0,  ' filesystem            size   Used Avail Use% Mounted on\n/dev/sda2              9.9g  7.3g  2.2g  78% /\ntmpfs                  3.9g   4.0K  3.9G   1% /dev/shm\n/dev/sda1             1008M   82M  876M   9%  /boot\n/dev/sda4             899g    36g  818g   5% /data1\n10.16.2.8:openstack_glances\n                       899G   37G   816g   5% /var/lib/glance/images ') >>> >>>  Commands.getstatusoutput (' df -h ') [0]0

3.os.popen () module

>>> import os>>> p = os.popen (' df -h ') >>> p.read () ' filesystem            size  used  Avail Use% Mounted on\n/dev/sda2              9.9G  7.3G  2.2G  78% /\ntmpfs                  3.9G  4.0K   3.9G   1% /dev/shm\n/dev/sda1             1008M   82M  876M   9% /boot\n/dev/sda4              899G   36G   818g   5% /data1\n10.16.2.8:openstack_glances\n                       899g   37g  816g    5% /var/lib/glance/images\n ' Other methods, as well as p.readline () read a line, p.readlines () reads all the rows, and the file operation is similar to the method! It is not recommended to use this method, subprocess is recommended because Subprocess is a more advanced package of os.popen () and more powerful

4.subprocess Module

This article from "Happy Laboratory" blog, declined reprint!

Python real-Combat series of batch host ping Network test (07)