# Certbot Docker

Docker Certbot that runs on a schedule to create and renew SSL certificates. Uses Cloudflare for DNS-01 verification. Automatic renewal attempt happens every 6 hours.

## Building & Running

```
git clone https://git.mrmeeb.stream/certbot-cron-docker

cd certbot-cron-docker

docker build -t certbot-cron .

docker run -d --name certbot-cron \
    -e EMAIL=admin@domain.com \
    -e DOMAINS=domain.com \
    -v /docker/certbot-cron:/config \
    certbot-cron
```

## Environment Variables:

| Variable | Default Value | Description |
| --- | --- | --- |
| EMAIL | None | Email address for renewal information & other communications |
| DOMAINS | None | Domains to be included in the certificate. Comma separated list, no spaces. Wildcards supported |
| INTERVAL | 0 */6 * * * | How often certbot attempts to renew the certificate. Cron syntax |
| STAGING | false | (case-sensitive) Uses the LetsEncrypt staging endpoint for testing - avoids the aggressive rate-limiting of the production endpoint |
| PROPOGATION_TIME | 10 | The amount of time (seconds) that certbot waits for the TXT records to propogate to Cloudflare before verifying - the more domains in the certificate, the longer you might need |
| GENERATE_DHPARAM | true | (case-sensitive) Generate Diffie-Hellman keys in /config/letsencrypt/keys |


## Volumes

| Docker path | Purpose |
| --- | --- |
| /config | Stores configs and LetsEncrypt output for mounting in other containers

## Other

Thanks to [this guy](https://stackoverflow.com/questions/63447441/docker-stop-for-crond-times-out) for explaining how to make cron actually shutdown when stopping the container.