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# Environment Variables
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| Name | Description | Default Value |
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| ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------- |
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| DERP_HOSTNAME | Specifies the domain for the DERP server. | `example.com` |
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| DERP_CERTMODE | Determines the SSL/TLS certificate management mode. Options: `manual`, `letsencrypt` | `letsencrypt` |
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| DERP_ADDR | Sets the server address and port to bind to. | `:443` |
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| DERP_VERIFY_CLIENTS | Whether to verify clients connecting to the DERP server. [reference](https://tailscale.com/kb/1118/custom-derp-servers#optional-restricting-client-access-to-your-derp-node) | `false` |
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| DERP_HTTP_PORT | Sets the port for the HTTP server. | `80` |
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| DERP_STUN_ENABLE | Whether to enable STUN. | `true` |
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| DERP_STUN_PORT | Sets the port for the STUN server. | `3478` |
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# Volumes
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| Name | Description |
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| ---------- | ------------------------------------------------ |
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| /app/certs | Directory where SSL/TLS certificates are stored. |
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# Usage
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```shell
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docker run -d --name derper \
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-p 80:80 -p 443:443 -p 3478:3478 \
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-e DERP_DOMAIN=example.com \
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nite07/tailscale-derp-docker:latest
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```
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[Adding DERP servers to your tailnet](https://tailscale.com/kb/1118/custom-derp-servers#step-2-adding-derp-servers-to-your-tailnet)
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