137 lines
3.2 KiB
Python
137 lines
3.2 KiB
Python
#!/usr/bin/env python3
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"""
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=encoding utf8
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=head1 NAME
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kvm_cpu - show CPU usage of VM
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=head1 CONFIGURATION
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Parsed environment variables:
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vmsuffix: part of VM name to be removed
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=head1 LICENSE
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GPLv3
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SPDX-License-Identifier: GPL-3.0-only
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=head1 AUTHORS
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Maxence Dunnewind
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Rodolphe Quiédeville
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=head1 MAGIC MARKERS
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#%# capabilities=autoconf
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#%# family=contrib
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=cut
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"""
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import os
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import re
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import sys
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from subprocess import Popen, PIPE
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def config(vm_names):
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''' Print the plugin's config
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@param vm_names : a list of "cleaned" vms' name
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'''
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percent = 100 * len(
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list(
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filter(
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lambda x: x[0:3] == 'cpu' and x[3] != ' ', open('/proc/stat', 'r').readlines())))
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base_config = """graph_title KVM Virtual Machine CPU usage
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graph_vlabel %%
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graph_category virtualization
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graph_scale no
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graph_period second
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graph_info This graph shows the current CPU used by virtual machines
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graph_args --base 1000 -r --lower-limit 0 --upper-limit %d""" % percent
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print(base_config)
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for vm in vm_names:
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print("%s_cpu.label %s" % (vm, vm))
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print("%s_cpu.min 0" % vm)
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print("%s_cpu.type DERIVE" % vm)
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print("%s_cpu.draw AREASTACK" % vm)
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print("%s_cpu.info percent of cpu time used by virtual machine" % vm)
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def clean_vm_name(vm_name):
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''' Replace all special chars
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@param vm_name : a vm's name
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@return cleaned vm's name
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'''
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# suffix part defined in conf
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suffix = os.getenv('vmsuffix')
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if suffix:
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vm_name = re.sub(suffix, '', vm_name)
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# proxmox uses kvm with -name parameter
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parts = vm_name.split('\x00')
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if parts[0].endswith('kvm'):
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try:
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return parts[parts.index('-name') + 1]
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except ValueError:
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pass
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return re.sub(r"[^a-zA-Z0-9_]", "_", vm_name)
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def detect_kvm():
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''' Check if kvm is installed '''
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kvm = Popen("which kvm", shell=True, stdout=PIPE)
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kvm.communicate()
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return not bool(kvm.returncode)
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def find_vm_names(pids):
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'''Find and clean vm names from pids
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@return a dictionary of {pids : cleaned vm name}
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'''
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result = {}
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for pid in pids:
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cmdline = open("/proc/%s/cmdline" % pid, "r")
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result[pid] = clean_vm_name(
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re.sub(r"^.*guest=([a-zA-Z0-9.-_-]*).*$", r"\1", cmdline.readline()))
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return result
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def list_pids():
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''' Find the pid of kvm processes
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@return a list of pids from running kvm
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'''
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pid = Popen("pidof qemu-kvm qemu-system-x86_64 kvm", shell=True, stdout=PIPE)
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return pid.communicate()[0].decode().split()
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def fetch(vms):
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''' Fetch values for a list of pids
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@param dictionary {kvm_pid: cleaned vm name}
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'''
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for pid, name in vms.items():
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user, system = open("/proc/%s/stat" % pid, 'r').readline().split(' ')[13:15]
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print('%s_cpu.value %d' % (name, int(user) + int(system)))
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if __name__ == "__main__":
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if len(sys.argv) > 1:
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if sys.argv[1] in ['autoconf', 'detect']:
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if detect_kvm():
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print("yes")
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else:
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print("no")
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elif sys.argv[1] == "config":
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config(find_vm_names(list_pids()).values())
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else:
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fetch(find_vm_names(list_pids()))
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else:
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fetch(find_vm_names(list_pids()))
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