前言
linux资源监控系列文章:
关联文章:
一 free命令获取内存信息
通过free 命令查看内存和交换空间的使用情况
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free
free 默认单位为KB， 可以使用free -m 以MB为单位，或者 free -g 以GB为单位显示。
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free -m
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free -g
二 python脚本实现
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import os
import subprocess
import signal
# 获取内存信息
def get_MemoryInfo(ip):
timeout_seconds = 30
cmd = 'ssh -o StrictHostKeyChecking=no %s free' % ip
# res = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
memory_utilization = '-1'
swap_utilization = '-1'
res = timeout_Popen(cmd, timeout=timeout_seconds)
if res:
stdout = res.stdout.readlines()
if not stdout:
print('ssh %s 连接失败, 获取memory信息失败' % ip)
return [memory_utilization, swap_utilization]
memory_info = stdout[1].decode().split()
swap_info = stdout[2].decode().split()
totoal_memory = int(memory_info[1])
available_memory = int(memory_info[-1])
# used_memory = float(memory_info[2])
# memory_utilization = str(round((used_memory / totoal_memory) *100, 2))
memory_utilization = ((totoal_memory-available_memory)/totoal_memory)*100
memory_utilization = str(round(memory_utilization, 2))
totoal_swap = int(swap_info[1])
if totoal_swap == 0:
print('ip: %s,交换空间为0' % ip)
available_swap = int(swap_info[-1])
swap_utilization = ((totoal_swap - available_swap) / totoal_swap) * 100
swap_utilization = str(round(swap_utilization, 2))
# used_swap = float(swap_info[2])
# swap_utilization = str(round((used_swap / totoal_swap)*100, 2))
# print('--------- ip:%s----------' % ip)
# print('swap: %d, %d, %s' % (totoal_swap, available_swap, swap_utilization))
# print('memory: %d, %d, %s\n' %(totoal_memory, available_memory, memory_utilization))
else:
print('{}: timeout > {}s, 获取memory信息失败'.format(ip, timeout_seconds))
return [memory_utilization, swap_utilization]
# 处理popen等待超时:
def timeout_Popen(cmd, timeout=30):
start = time.time()
process = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
while process.poll() is None: # 是否结束
time.sleep(0.2)
now = time.time()
if now - start >= timeout:
os.kill(process.pid, signal.SIGKILL)
# pid=-1 等待当前进程的all子进程, os.WNOHANG 没有子进程退出,
os.waitpid(-1, os.WNOHANG)
return None
return process
