https://www.notion.so/Service-Operations-on-CentOS-e2dbd2619fa24666ba86d19f4e6297a5
Enable or disable service on OS start
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$ systemctl disable httpd
rm '/etc/systemd/system/multi-user.target.wants/httpd.service'
$ systemctl status httpd
httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; **disabled**)
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$ systemctl enable httpd
ln -s '/usr/lib/systemd/system/httpd.service' '/etc/systemd/system/multi-user.target.wants/httpd.service'
$ systemctl status httpd
httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; **enabled**)