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versioned_docs/version-2.5/installation/resources/tls-settings/tls-settings.md
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title: TLS Settings
weight: 3
aliases:
- /rancher/v2.5/en/installation/options/tls-settings/
- /rancher/v2.5/en/admin-settings/tls-settings
- /rancher/v2.5/en/installation/resources/encryption/tls-settings
- /rancher/v2.x/en/installation/resources/tls-settings/
---
Changing the default TLS settings depends on the chosen installation method.
# Running Rancher in a highly available Kubernetes cluster
When you install Rancher inside of a Kubernetes cluster, TLS is offloaded at the cluster's ingress controller. The possible TLS settings depend on the used ingress controller:
* nginx-ingress-controller (default for RKE1 and RKE2): [Default TLS Version and Ciphers](https://kubernetes.github.io/ingress-nginx/user-guide/tls/#default-tls-version-and-ciphers).
* traefik (default for K3s): [TLS Options](https://doc.traefik.io/traefik/https/tls/#tls-options).
# Running Rancher in a single Docker container
The default TLS configuration only accepts TLS 1.2 and secure TLS cipher suites. You can change this by setting the following environment variables:
| Parameter | Description | Default | Available options |
|-----|-----|-----|-----|
| `CATTLE_TLS_MIN_VERSION` | Minimum TLS version | `1.2` | `1.0`, `1.1`, `1.2`, `1.3` |
| `CATTLE_TLS_CIPHERS` | Allowed TLS cipher suites | `TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256`,<br/>`TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384`,<br/>`TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305`,<br/>`TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256`,<br/>`TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384`,<br/>`TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305` | See [Golang tls constants](https://golang.org/pkg/crypto/tls/#pkg-constants) |