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simple server usage monitoring, writing json to stdout.
#!/usr/bin/env python3
"""
simple server usage monitoring, writing json to stdout.
usage: nohup python3 monitor_usage.py 3 > /var/log/usage.log &
"""
import sys
import psutil
import json
import time
import subprocess
try:
interval = int(sys.argv[1])
except IndexError:
interval = 1
disk_bytes_read_last = disk_bytes_write_last = 0
net_bytes_read_last = net_bytes_write_last = 0
iowait_last = 0
while True:
disk = psutil.disk_io_counters()
disk_bytes_read, disk_bytes_write = disk.read_bytes, disk.write_bytes
net = psutil.net_io_counters()
net_bytes_read, net_bytes_write = net.bytes_recv, net.bytes_sent
iowait = psutil.cpu_times().iowait
disks = [d.mountpoint for d in psutil.disk_partitions()]
disks_usage = [psutil.disk_usage(d) for d in disks]
disks_used = sum(d.used for d in disks_usage)
disks_total = sum(d.total for d in disks_usage)
usage = json.dumps({
'cpu_percent': psutil.cpu_percent(),
'memory_percent': psutil.virtual_memory().percent,
'cache_percent': round(psutil.virtual_memory().cached / psutil.virtual_memory().total * 100, 1),
'slab_percent': round(psutil.virtual_memory().slab / psutil.virtual_memory().total * 100, 1),
'swap_percent': psutil.swap_memory().percent,
'disk_percent': round((disks_used / disks_total * 100), 2),
'iowait_percent': round((iowait - iowait_last) / psutil.cpu_count() * 100, 1),
'net_read_mb_s': '{:,}'.format(int((net_bytes_read - net_bytes_read_last) / 1024 / 1024)),
'net_write_mb_s': '{:,}'.format(int((net_bytes_write - net_bytes_write_last) / 1024 / 1024)),
'disk_read_mb_s': '{:,}'.format(int((disk_bytes_read - disk_bytes_read_last) / 1024 / 1024)),
'disk_write_mb_s': '{:,}'.format(int((disk_bytes_write - disk_bytes_write_last) / 1024 / 1024)),
'lsof': '{:,}'.format(int(subprocess.check_output('lsof | wc -l', shell=True).decode())),
'net_fds': '{:,}'.format(len(psutil.net_connections())),
'pids': '{:,}'.format(len(psutil.pids())),
})
print(usage, flush=True)
time.sleep(interval)
net_bytes_read_last, net_bytes_write_last = net_bytes_read, net_bytes_write
disk_bytes_read_last, disk_bytes_write_last = disk_bytes_read, disk_bytes_write
iowait_last = iowait
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