# Security recommendations




F5 NGINX Ingress Controller LTS follows Kubernetes best practices: this page outlines configuration specific to NGINX Ingress Controller LTS you may require, including links to examples in the [GitHub repository](https://github.com/nginx/kubernetes-ingress/tree/v/examples).

For general guidance, we recommend the official Kubernetes documentation for [Securing a Cluster](https://kubernetes.io/docs/tasks/administer-cluster/securing-a-cluster/).

## Kubernetes recommendations

### RBAC and Service Accounts

Kubernetes uses [RBAC](https://kubernetes.io/docs/reference/access-authn-authz/rbac/) to control the resources and operations available to different types of users.

NGINX Ingress Controller LTS requires RBAC to configure a [ServiceUser](https://kubernetes.io/docs/concepts/security/service-accounts/#default-service-accounts), and provides least privilege access in its standard deployment configurations:

- [Helm](https://github.com/nginx/kubernetes-ingress/blob/v/deployments/rbac/rbac.yaml)
- [Manifests](https://github.com/nginx/kubernetes-ingress/blob/v/deployments/rbac/rbac.yaml)

By default, the ServiceAccount has access to all Secret resources in the cluster.

### Secrets

[Secrets](https://kubernetes.io/docs/concepts/configuration/secret/) are required by NGINX Ingress Controller LTS for certificates and privacy keys, which Kubernetes stores unencrypted by default. We recommend following the [Kubernetes documentation](https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/) to store these Secrets using at-rest encryption.

## NGINX Ingress Controller LTS recommendations

### Configure root filesystem as read-only

NGINX Ingress Controller LTS is designed to be resilient against attacks in various ways, such as running the service as non-root to avoid changes to files. We recommend setting filesystems on `nginx-ingress-controller` container to read-only. This is so that the attack surface is further reduced by limiting changes to binaries and libraries.

This is not enabled by default, but can be enabled with **Helm** using the [**readOnlyRootFilesystem**](/nic/lts/install/helm.md#configuration) argument in security contexts.

For **Manifests**, uncomment the following sections of the deployment:

- `readOnlyRootFilesystem: true`
- The entire **volumeMounts** section
- The entire **initContainers** section

The block below shows the code you will look for:

```yaml
#      volumes:
#      - name: nginx-etc
#        emptyDir: {}
#      - name: nginx-cache  # do not set this value in statefulset if volumeclaimtemplate is set
#        emptyDir: {}       # do not set this value in statefulset if volumeclaimtemplate is set
#      - name: nginx-lib
#        emptyDir: {}
#      - name: nginx-lib-state
#        emptyDir: {}
#      - name: nginx-log
#        emptyDir: {}
.
.
.
#          readOnlyRootFilesystem: true
.
.
.
#        volumeMounts:
#        - mountPath: /etc/nginx
#          name: nginx-etc
#        - mountPath: /var/cache/nginx
#          name: nginx-cache
#        - mountPath: /var/lib/nginx
#          name: nginx-lib
#        - mountPath: /var/lib/nginx/state
#          name: nginx-lib-state
#        - mountPath: /var/log/nginx
#          name: nginx-log
```

### Prometheus

If Prometheus metrics are [enabled](/nic/lts/logging-and-monitoring/prometheus.md), we recommend [using HTTPS](/nic/lts/configuration/global-configuration/command-line-arguments.md#cmdoption-prometheus-tls-secret).

### Snippets

Snippets allow raw NGINX configuration to be inserted into resources. They are intended for advanced NGINX users and could create vulnerabilities in a cluster if misused.

Snippets are disabled by default. To use snippets, set the [**enable-snippets**]() command-line argument.

**caution:** 
 Snippets are **always** enabled for ConfigMap.

For more information, read the following:

- [Advanced configuration using Snippets](/nic/lts/configuration/ingress-resources/advanced-configuration-with-snippets.md)
- [Using Snippets with VirtualServer/VirtualServerRoute](/nic/lts/configuration/virtualserver-and-virtualserverroute-resources.md#using-snippets)
- [Using Snippets with TransportServer](/nic/lts/configuration/transportserver-resource.md#using-snippets)
- [ConfigMap snippets and custom templates](/nic/lts/configuration/global-configuration/configmap-resource.md#snippets-and-custom-templates)