mirror of
https://github.com/munin-monitoring/contrib.git
synced 2025-07-21 18:41:03 +00:00
3dc47ad750
Improved the regex parsing to handle cmdline with `k` suffix on memory and to output the command line to stderr if it can't be parsed
115 lines
3.5 KiB
Python
Executable file
115 lines
3.5 KiB
Python
Executable file
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# vim: set fileencoding=utf-8
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#
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# Munin plugin to show amount of memory used by vm
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#
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# Copyright Maxence Dunnewind, Rodolphe Quiédeville, Adrien Pujol
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#
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# License : GPLv3
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#
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# parsed environment variables:
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# vmsuffix: part of vm name to be removed
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#
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#%# capabilities=autoconf
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#%# family=contrib
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import re, os, 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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base_config = """graph_title KVM Virtual Machine Memory usage
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graph_vlabel Bytes
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graph_category virtualization
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graph_info This graph shows the current amount of memory used by virtual machines
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graph_args --base 1024 -l 0"""
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print(base_config)
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for vm in vm_names:
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print("%s_mem.label %s" % (vm, vm))
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print("%s_mem.type GAUGE" % vm)
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print("%s_mem.draw %s" % (vm, "AREASTACK"))
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print("%s_mem.info memory used by virtual machine %s" % (vm, 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 re.sub(r"(^[^A-Za-z_]|[^A-Za-z0-9_])", "_", 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-z_]|[^A-Za-z0-9_])", "_", vm_name)
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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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res = {}
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for pid in vms:
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try:
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with open(f"/proc/{pid}/cmdline", "rb") as f:
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line = f.read().replace(b'\x00', b' ')
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match = re.search(rb"-m\s+size=(\d+)k", line)
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if match:
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amount = int(match.group(1)) * 1024
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else:
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match = re.search(rb"-m\s+size=(\d+)", line)
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if match:
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amount = int(match.group(1)) * 1024 * 1024
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else:
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raise ValueError(f"Memory size not found in {line}")
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print(f"{vms[pid]}_mem.value {amount}")
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except Exception as e:
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print(f"Error extracting memory for PID {pid}: {e}", file=sys.stderr)
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def detect_kvm():
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''' Check if kvm is installed
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'''
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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(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, text=True)
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return pid.communicate()[0].split()
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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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