Cannot start services on CentOS 7

William asked:

Suddenly, I cannot start services on my VPS(CentOS 7). For example,

service httpd start
Redirecting to /bin/systemctl start  httpd.service
Authorization not available. Check if polkit service is running or see debug message for more information.
Failed to start httpd.service: Connection timed out
See system logs and 'systemctl status httpd.service' for details.

This is probably because the domain name I used as the host name has expired. I do not know the logic behind the service command. I start httpd, why does it invoke polkit service? The polkit service is also dead and cannot be started. The "service polkit status -l" command shows a message:

Lost the name org.freedesktop.PolcyKit1 - exiting

How to solve the problem?

My answer:

You need to use sudo

[[email protected] ~]$ sudo systemctl start httpd

or login as root

[[email protected] ~]# systemctl start httpd

in order to start and stop services.

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