如何从systemctl status的输出中获取单个值

Question

[root@localhost etc]# systemctl status blu_av
● blu_av.service - avscan
   Loaded: loaded (/etc/systemd/system/blu_av.service; disabled; vendor preset: disabled)
   Active: active (running) since Fri 2018-03-16 16:31:14 IST; 3s ago
 Main PID: 31934 (av)
   CGroup: /system.slice/blu_av.service
           ├─31934 /opt/services/av
           └─31956 /opt/services/av

Mar 16 16:31:14 localhost.localdomain systemd[1]: Started avscan.
Mar 16 16:31:14 localhost.localdomain systemd[1]: Starting avscan...

如果以上是我状态的输出。我想使用python脚本检索服务名称、正常运行时间和状态。需要建议吗

Answer 1

systemctl status有一个选项^{}，它允许使用^{}的选项。在

试试Python可以轻松解析的JSON：

$ sudo systemctl status --output=json-pretty nginx

Answer 2

也许您可以尝试regular expression来解析输出。这是我用过的。请看一看并发表意见。在

import subprocess, re

def read_status(service):
    p =  subprocess.Popen(["systemctl", "status",  service], stdout=subprocess.PIPE)
    (output, err) = p.communicate()
    output = output.decode('utf-8')

    service_regx = r"Loaded:.*\/(.*service);"
    status_regx= r"Active:(.*) since (.*);(.*)"
    service_status = {}
    for line in output.splitlines():
        service_search = re.search(service_regx, line)
        status_search = re.search(status_regx, line)

        if service_search:
            service_status['service'] = service_search.group(1)
            #print("service:", service)

        elif status_search:
            service_status['status'] = status_search.group(1).strip()
            #print("status:", status.strip())
            service_status['since'] = status_search.group(2).strip()
            #print("since:", since.strip())
            service_status['uptime'] = status_search.group(3).strip()
            #print("uptime:", uptime.strip())

    return service_status

def main():
    service = 'mysql'
    reponse = read_status(service)

    for key in reponse:
        print('{}:{}'.format(key, reponse[key]))


if __name__ == '__main__':
    main()

输出：

^{pr2}$

我只需使用this来检查我的正则表达式。在

Answer 3

systemd服务有一个完整的属性列表。例如，要获取开始时间，可以运行：

systemctl show your.service --property=ActiveEnterTimestamp

会产生类似于：

^{pr2}$

查看所有属性的列表；只需运行

systemctl show your.service