python3判断进程是否存在

服务器经常内存爆满，系统就会自动kill掉某些进程。想起来使用Python写一个脚本判断这几个web进程是否存在，不存在直接发送邮件给我并且尝试启动 - 使用psutil模块查找进程

def name(a):
    import psutil
    pids = psutil.pids()   #获取所有的进程的pid
    names = []
    for i in pids:  #遍历循环ID
        name = psutil.Process(i)  #通过pid查找进程的详细信息
        names.append(name.name()) #返回集成名称并添加到names
    if a in names:
        return True  #存在就返回真
    else:
        return False   #不存在返回假

• 运行全部代码

__author__ = 'xiaobing'
import socket,os
def mail(seiz, anb):
    from email.mime.text import MIMEText
    from email.header import Header
    from smtplib import SMTP_SSL
    # qq邮箱smtp服务器
    host_server = 'smtp.qq.com'
    # sender_qq为发件人的qq号码
    sender_qq = '358400845@qq.com'
    # pwd为qq邮箱的授权码
    pwd = 'sdfsdfsdfsdf'  # xh**********bdc
    # 发件人的邮箱
    sender_qq_mail = '358400845@qq.com'
    # 收件人邮箱
    receiver = 'lhb0703love@163.com'
    hostname = socket.gethostname()
    # 邮件的正文内容
    mail_content = '''
    stop %s进程已停止\n
    start %s
    ''' % (seiz, nab)
    # 邮件标题
    mail_title = '%s主机进程' % hostname

    # ssl登录
    smtp = SMTP_SSL(host_server)
    # set_debuglevel()是用来调试的。参数值为1表示开启调试模式，参数值为0关闭调试模式
    smtp.set_debuglevel(0)
    smtp.ehlo(host_server)
    smtp.login(sender_qq, pwd)

    msg = MIMEText(mail_content, "plain", 'utf-8')
    msg["Subject"] = Header(mail_title, 'utf-8')
    msg["From"] = sender_qq_mail
    msg["To"] = receiver
    smtp.sendmail(sender_qq_mail, receiver, msg.as_string())
    smtp.quit()
def name(a):
    import psutil
    pids = psutil.pids()
    names = []
    for i in pids:
        name = psutil.Process(i)
        names.append(name.name())
    if a in names:
        return True
    else:
        return False
def if_pid(abc):
    ps1 = name(abc)
    if ps1 == False:
        na = "%s进程启动失败" % abc
    else:
        na = "%s进程启动成功" % abc
    mail(abc, na)
def ifi(a):
    for i in a:
        ps = name(i)
        if ps == False:
            if i != "mysqld":
                os.system("systemctl start %s" % i)
                if_pid(i)
            else:
                os.system("systemctl start mariadb")
                if_pid(i)
if __name__ == '__main__':
    hostname = socket.gethostname()
    a = ["php-fpm", "nginx", "mysqld"]
    ifi(a)