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add lego example

Jeremy Lin 2021-02-26 00:55:02 -08:00
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Running-a-private-bitwarden_rs-instance-with-Let's-Encrypt-certs.md

@ -109,6 +109,25 @@ export WEBSOCKET_ENABLED=true
You should now be able to reach your bitwarden_rs instance at https://bwrs.example.com.
## Getting certs using the `lego` CLI
In the DuckDNS example above, Caddy used the [`lego`](https://github.com/go-acme/lego) library to get certs via DNS challenge.
`lego` also has a CLI that you can use to get certs directly, e.g. if you want to a reverse proxy other than Caddy.
Here's an example of how to do this:
1. Download a pre-built `lego` binary for your system from https://github.com/go-acme/lego. Extract the contents to some directory, say, `/usr/local/lego`.
2. From that directory, run `DUCKDNS_TOKEN=<token> ./lego -a --dns duckdns -d my-bwrs.duckdns.org -m me@example.com run`,
substituting appropriate values for the token, domain, and email address. This registers you with Let's Encrypt and
fetches a certificate for your domain.
3. Set up a weekly cron job to run `DUCKDNS_TOKEN=<token> ./lego --dns duckdns -d my-bwrs.duckdns.org -m me@example.com renew`.
This renews your certificate as it nears expiration.
In this example, the generated outputs you need to configure your reverse proxy with are:
* `/usr/local/lego/.lego/certificates/my-bwrs.duckdns.org.crt` (certificate)
* `/usr/local/lego/.lego/certificates/my-bwrs.duckdns.org.key` (private key)
## References
### DNS Challenge