Guide to running an nginx reverse proxy on Unraid with a Let's Encrypt wildcard cert, using the official nginx and certbot Docker images.

update_cert.sh

#!/bin/bash
#description=Updates the web gui ssl cert if it's been renewed.
set -eo pipefail

CERTS_DIR=/mnt/user/appdata/nginx-certbot/certs/live/default
BUNDLE=/boot/config/ssl/certs/certificate_bundle.pem

new_bundle=$(cat \
  "$CERTS_DIR/cert.pem" \
  "$CERTS_DIR/fullchain.pem" \
  "$CERTS_DIR/privkey.pem")

[[ -f $BUNDLE ]] && old_bundle=$(cat "$BUNDLE")

if [[ "$old_bundle" != "$new_bundle" ]]; then
  echo 'Updating SSL cert'
  cat <<<"$new_bundle" >"$BUNDLE"
  /etc/rc.d/rc.nginx restart
else
  echo 'Nothing to do'
fi