Failed to start nginx.service: Interactive authentication required. with crontab

Dora asked:

I am trying to make a crontab to start nginx if it is stopped.

I googled and found these two scripts

http://www.akamaras.com/linux/linux-script-to-check-if-a-service-is-running-and-start-it-if-its-stopped/

#!/bin/bash
service=replace_me_with_a_valid_service

if (( $(ps -ef | grep -v grep | grep $service | wc -l) > 0 ))
then
echo "$service is running!!!"
else
/etc/init.d/$service start
fi

somehow if I run it manually it works fine by doing source scriptName after I add it to crontab even if the service is stopped, it keeps on echoing nginx is running and does not start the service.

Then I found another script in digital ocean

https://www.digitalocean.com/community/tutorials/how-to-use-a-simple-bash-script-to-restart-server-programs

#!/bin/sh

ps auxw | grep nginx | grep -v grep > /dev/null

if [ $? != 0 ]
then
        /etc/init.d/nginx start > /dev/null
fi

again if I run it manually it works, but it will ask for the user’s password

==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to start 'nginx.service'.
Authenticating as: abc,,, (abc)

after I typed in the password ==== AUTHENTICATION COMPLETE ===
will show and starts nginx

then I add the script into crontab…I get this permission error

Failed to start nginx.service: Interactive authentication required.

Does anyone know how I can fix this?

Thanks in advance for any advices.

#!/bin/bash
if ! systemctl is-active nginx >/dev/null ; then
    systemctl start nginx
fi

[Service]
Restart=always