最近在做个人网站，但是由于服务器资源不足，偶尔会出现系统崩溃的现象，所以想写一个程序来实时监控系统状态。当系统资源占用过高时发送邮件提醒。

psutil（进程和系统实用程序）是一个跨平台的库，用于检索 Python中有关正在运行的进程和系统利用率（CPU，内存，磁盘，网络，传感器）的信息。它主要用于系统监视，概要分析和限制进程资源以及管理正在运行的进程。

1、安装psutil

pip3 install psutil    # python2用户直接使用pip install psutil

2、创建get_system_info.py文件，获取系统状态

 1 import psutil as p
 2 
 3 
 4 def memory(): # 获取内存信息
 5     info = p.virtual_memory()
 6     return info[2]
 7 
 8 
 9 def disk(): # 获取磁盘使用情况
10     info = p.disk_usage('/')
11     return info[-1], info[-2]
12 
13 
14 def cpu(): # 获取CPU使用率

15     info = p.cpu_percent(1)
16     return info

3、创建邮件发送send_Email.py文件

 1 import smtplib
 2 from email.header import Header
 3 from email.mime.text import MIMEText
 4 from email.utils import formataddr
 5 
 6 
 7 class send_Email():
 8     def __init__(self, mail_host, mail_port, mail_user, mail_pass, sender):
 9         self.mail_host = mail_host
10         self.mail_port = mail_port
11         self.mail_user = mail_user
12         self.mail_pass = mail_pass
13         self.sender = sender
14 
15     def make_mail(self, title, code, receiver): # 生成邮件
16         mail_msg = """
17         <h1>%s</h1>
18         <p>%s</p>
19         """ % (title, code)
20         self.message = MIMEText(mail_msg, "html", "utf-8")
21         self.message['From'] = formataddr(["XX", self.sender])
22         self.message['To'] = formataddr(["User", receiver])
23         subject = title
24         self.message['Subject'] = Header(subject, "utf-8")
25 
26     def send(self, receiver, title, code): # 发送邮件

27         status = 0
28         self.make_mail(title, code, receiver)
29         try:
30             self.smtpObj = smtplib.SMTP_SSL(self.mail_host, self.mail_port)
31             # print(1)
32             self.smtpObj.login(self.mail_user, self.mail_pass)
33             # print(2)
34             self.smtpObj.sendmail(self.sender, [receiver], self.message.as_string())
35             self.smtpObj.quit()
36             status = 1
37         except smtplib.SMTPException as e:
38             print("Error！ 无法发送邮件！！！" + e)
39         return status

4、整合代码

from send_Email import send_Email
import get_system_info as gsi

email = send_Email("smtp.163.com", 465, "*******@***.com", "**********", "********@***.com") # 初始化

memory = gsi.memory()
disk, capacity = gsi.disk()
info = str(memory)+"     "+str(disk)+"     "+str(round(capacity/1024/1024/1024, 2))
email.send(code=info, title="系统状态异常", receiver="*******@***.***")
status_d = 0
status_m = 0
while True: # 实时检测系统状态，会占用一定的系统资源
    memory = gsi.memory()
    disk, capacity = gsi.disk()
    if memory >= 80 and status_m == 0:
        status_m = 1
        data = "当前内存占用率为"+str(memory)+"%，建议清理或扩充内存！"
        email.send(code=data, title="系统状态异常", receiver="*******@***.***")
    elif memory < 80:
        status_m = 0
    if disk >= 80 and status_d == 0:
        status_d = 1
        data = "当前硬盘已使用"+str(disk)+"%，剩余"+str(round(capacity/1024/1024/1024, 2))+"GB，请及时扩充！"
        email.send(receiver="*******@***.***", title="系统状态异常", code=data)
    elif disk < 80:
        status_d = 0
    if memory >= 90 and status_m == 1:
        status_m = 2
        data = "当前内存占用率为"+str(memory)+"%，建议清理或扩充内存！"
        email.send(code=data, title="系统状态异常", receiver="*******@***.***")
    elif memory < 90:
        status_m = 1
    if disk >= 90 and status_d == 1:
        status_d = 2
        data = "当前硬盘已使用"+str(disk)+"%，剩余"+str(round(capacity/1024/1024/1024, 2))+"GB，请及时扩充！"
        email.send(receiver="*******@***.***", title="系统状态异常", code=data)
    elif disk < 90:
        status_d = 1

程序仍有不足之处，请大佬多多指教。