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cron/Dockerfile

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+FROM alpine:3.16
+
+RUN apk update && \
+    apk add --no-cache docker-cli docker-cli-compose
+
+COPY renew_certs.sh /etc/periodic/daily/renew_certs
+
+RUN chmod +x /etc/periodic/daily/renew_certs
+
+WORKDIR /workdir
+
+CMD ["crond", "-f", "-l", "0"]

cron/renew_certs.sh

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+#!/bin/sh
+
+cd /workdir
+echo "Renewing Let's Encrypt Certificates... (`date`)"
+docker compose run --rm --no-TTY --entrypoint certbot certbot renew --no-random-sleep-on-renew
+echo "Reloading Nginx configuration"
+docker compose exec --no-TTY nginx nginx -s reload