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---
title: "DNS Providers"
date: 2019-03-03T16:39:46+01:00
draft: false
weight: 3
---
## Configuration and Credentials
Credentials and DNS configuration for DNS providers must be passed through environment variables.
### Environment Variables: Value
The environment variables can reference a value.
Here is an example bash command using the Cloudflare DNS provider:
```console
$ CLOUDFLARE_EMAIL=you@example.com \
CLOUDFLARE_API_KEY=b9841238feb177a84330febba8a83208921177bffe733 \
lego --dns cloudflare --domains www.example.com --email you@example.com run
```
### Environment Variables: File
The environment variables can reference a path to file.
In this case the name of environment variable must be suffixed by `_FILE`.
{{% notice note %}}
The file must contain only the value.
{{% /notice %}}
Here is an example bash command using the CloudFlare DNS provider:
```console
$ cat /the/path/to/my/key
b9841238feb177a84330febba8a83208921177bffe733
$ cat /the/path/to/my/email
you@example.com
$ CLOUDFLARE_EMAIL_FILE=/the/path/to/my/email \
CLOUDFLARE_API_KEY_FILE=/the/path/to/my/key \
lego --dns cloudflare --domains www.example.com --email you@example.com run
```
## DNS Providers
{{% tableofdnsproviders %}}
|
