Python code to check if service is running or not.?

Question

I am using python2.7 to check if a service is running or not. I have made my own service and placed it inside /etc/init.d. I have a raspberry on which I am using it.

Now to normally check the status of service, we can do:

service my_service status

But how can I get the status of service from the python code.

Thanks

Answer 1

I might be a few years late to answer this.. but here is an easy solution I've found

import os  # I think it's better to use subprocess for this. but quick code for example

status = os.system('systemctl is-active --quiet service-name')
print(status)  # will return 0 for active else inactive.

Answer 2

Simply by using os.system(). You then get the return code of the execution; 0 means running, 768 stopped

>>> import os
>>> stat = os.system('service sshd status')
Redirecting to /bin/systemctl status  sshd.service
● sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2017-10-05 09:35:14 IDT; 29s ago
     Docs: man:sshd(8)
           man:sshd_config(5)
  Process: 620 ExecStart=/usr/sbin/sshd $OPTIONS (code=exited, status=0/SUCCESS)
 Main PID: 634 (sshd)
   CGroup: /system.slice/sshd.service
           └─634 /usr/sbin/sshd
>>> stat
0  <--  means service is running

>>> os.system('service sshd stop')
Redirecting to /bin/systemctl stop  sshd.service
0  <-- command succeeded

>>> os.system('service sshd status')
Redirecting to /bin/systemctl status  sshd.service
● sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Thu 2017-10-05 09:41:58 IDT; 10s ago
     Docs: man:sshd(8)
...
768 <-- service not running

The return code is the one returned from the execution. From the service manpage:

EXIT CODES service calls the init script and returns the status returned by it.

So it's up to the init script executed. You can safely say any return code other than 0 means the service is not running.

You can either check if the process is running instead using:

>>> os.system('ps aux | grep sshd | grep -v grep | wc -l')
2
>>> os.system('ps aux | grep sshd123 | grep -v grep | wc -l')
0

Answer 3

Little bit off-topic answer here (for python3).

In python3 you can use pystemd for this purpose. It talks with systemd via it's dbus API, so it's better than just executing systemctl and parsing it's output.

P.S. It's better to use subprocess module instead of using os.system().

Answer 4

Using subprocess :

import subprocess

stat = subprocess.call(["systemctl", "is-active", "--quiet", "ssh"])
if(stat == 0):  # if 0 (active), print "Active"
    print("Active")

Also, I found this answer that explains well why use subprocess instead of os.system

Answer 5

You can see my code for reference:

#!/usr/bin/env python
import os

def isActive(daemon):
    command = "systemctl is-active " + daemon + " > tmp"
    os.system(command)
    with open('tmp') as tmp:
        tmp = tmp.read()
        if "active" in tmp:
            os.remove('tmp')
            return 1
    return 0


sshd = "sshd"

print(isActive(sshd))

Answer 6

use os.popen method to get output of a cmd command and check it by if statement

import os

STATE = os.popen('sc query ServiceName').read()
if STATE.find("RUNNING") != -1:
  print("Service is working")
else:
  print("Service is not working")

Answer 7

The first thing you need to do is define what you mean by running:

• systemd gives you a ok status
• process is running/shows up in PS
• things actually work, ie can get a web page or ssh into box on local host

Then write something that preforms your test or find a tool that works for you