2018-4-27 python实现systemd进程后台运行任务

   这个功能非常实用啊，这样子可以通过ansible推送agent到客户端上，然后守护进程进行周期性采集数据，返回给服务端，server端再前端展示数据。

[root@k8s-master py]# cat /root/py/test.py  # 更改此文件，要重启systemd restart test.service服务才行

#!/usr/bin/env python
# -*- coding=utf-8 -*-
import time
filepath = '/root/py/test_systemd' # 文件路径
fm = '%Y-%m-%d %X'
def get_time():
    while 1:
        nowtime = time.strftime(fm, time.localtime())
        with open(filepath, 'a') as fp:  # a模式就代表写形式的追加
            fp.write(nowtime)
            fp.write('\n')
        time.sleep(5)

if __name__ == '__main__':
    get_time()

[root@k8s-master py]# touch /root/py/test_systemd
[root@k8s-master py]# cat /etc/systemd/system/test.service
[Unit]
Description = test daemon
After = rc.local.service

[Service]
Type = simple
User = root
Group = root
ExecStart = /usr/bin/python /root/py/test.py
StartLimitInterval = 30min

[Install]
WantedBy = multi-user.target

[root@k8s-master py]# systemctl start test.service && systemctl enable test.service
[root@k8s-master py]# ps -ef |grep python
[root@k8s-master py]# tail -f /root/py/test_systemd
2018-04-23 11:41:15
2018-04-23 11:41:20
2018-04-23 11:41:25
2018-04-23 11:41:30