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网上搜，东拼西凑，组装了一个可以查Linux服务器CPU使用率、内存使用率、磁盘空间占用率、负载情况的python脚本。
脚本内容如下：
# -*- coding:utf-8 -*- - import os, timelast_worktime=0last_idletime=0def get_cpu():global last_worktime, last_idletimef=open("/proc/stat","r")line=""while not "cpu " in line: line=f.readline()f.close()spl=line.split(" ")worktime=int(spl[2])+int(spl[3])+int(spl[4])idletime=int(spl[5])dworktime=(worktime-last_worktime)didletime=(idletime-last_idletime)rate=float(dworktime)/(didletime+dworktime)last_worktime=worktimelast_idletime=idletimeif(last_worktime==0): return 0return ratedef get_mem_usage_percent():try:f = open('/proc/meminfo', 'r')for line in f:if line.startswith('MemTotal:'):mem_total = int(line.split()[1])elif line.startswith('MemFree:'):mem_free = int(line.split()[1])elif line.startswith('Buffers:'):mem_buffer = int(line.split()[1])elif line.startswith('Cached:'):mem_cache = int(line.split()[1])elif line.startswith('SwapTotal:'):vmem_total = int(line.split()[1])elif line.startswith('SwapFree:'):vmem_free = int(line.split()[1])else:continuef.close()except:return Nonephysical_percent = usage_percent(mem_total - (mem_free + mem_buffer + mem_cache), mem_total)virtual_percent = 0if vmem_total > 0:virtual_percent = usage_percent((vmem_total - vmem_free), vmem_total)return physical_percent, virtual_percentdef usage_percent(use, total):try:ret = (float(use) / total) * 100except ZeroDivisionError:raise Exception("ERROR - zero division error")return retstatvfs = os.statvfs('/')total_disk_space = statvfs.f_frsize * statvfs.f_blocksfree_disk_space = statvfs.f_frsize * statvfs.f_bfreedisk_usage = (total_disk_space - free_disk_space) * 100.0 / total_disk_spacedisk_usage = int(disk_usage)disk_tip = "硬盘空间使用率（最大100%）："+str(disk_usage)+"%"print(disk_tip)mem_usage = get_mem_usage_percent()mem_usage = int(mem_usage[0])mem_tip = "物理内存使用率（最大100%）："+str(mem_usage)+"%"print(mem_tip)cpu_usage = int(get_cpu()*100)cpu_tip = "CPU使用率（最大100%）："+str(cpu_usage)+"%"print(cpu_tip)load_average = os.getloadavg()load_tip = "系统负载（三个数值中有一个超过3就是高）："+str(load_average)print(load_tip)
在Linux服务器上touch一个py文件，把以上内容粘贴进去并保存。运行python脚本，效果如下：
一目了然。以后再出现访问后台接口502、无返回的情况，在后台服务器执行一下脚本，看看是不是这方面引起的问题，是不是内存占用过高，是不是磁盘满了等等。方便后台服务器环境问题的定位，以便联系相关的开发或运维来协助解决问题。
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