What you want is for your init process to run it, not cron. Cron can do it but it's basically a hack.
If your version of Debian uses systemd, you'll want to make a unit file. You can see the ones I'm using in my post history.
If it's using sysvinit still, you'll want either a /etc/init.d script or to put it in your /etc/inittab. The latter will ensure that it starts back up if it crashes.
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