Can not start service

[hongson47]

Hi everyone. i'm new comer. I have a VPS running CentOS 7.6.1810.
When i tried to start Varnish

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service varnish start

Result

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

and check

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systemctl status varnish.service

result.

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● varnish.service - Varnish Cache, a high-performance HTTP accelerator
   Loaded: loaded (/usr/lib/systemd/system/varnish.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

Can anyone help me?

[northpoint]

Wouldnt the command be:

sudo systemctl start varnish

And to make it start on reboots:

sudo systemctl enable varnish

?