Overview - Infisical

Infisical Relay is a secure routing layer that allows Infisical to connect to your private network resources, such as databases or internal APIs, without exposing them to the public internet. The relay acts as an intermediary, forwarding encrypted traffic between Infisical and your deployed gateways. This ensures that your sensitive data remains protected and never leaves your network unencrypted. With this architecture, you can achieve secure, firewall-friendly access across network boundaries, making it possible for Infisical to interact with resources even in highly restricted environments.

Before diving in, it's important to determine whether you actually need to deploy your own relay server or if you can use Infisical's managed infrastructure.

Do You Need to Deploy a Relay?

Not all users need to deploy their own relay servers. Infisical provides managed relay infrastructure in US/EU regions for Infisical Cloud users, which requires no setup or maintenance. You only need to deploy a relay if you:

Are self-hosting Infisical
Have a dedicated enterprise instance of Infisical (managed by Infisical)
Require closer geographic proximity to target resources than managed relays provide for lower latency and reduced network congestion when accessing resources through the relay
Need full control over relay infrastructure and traffic routing

If you are using Infisical Cloud and do not have specific requirements, you can use the managed relays provided by Infisical and skip the rest of this guide.

Deployment Steps

To successfully deploy an Infisical Relay for use, follow these steps in order.

<Steps> <Step title="Provision a Machine Identity"> Create a machine identity with the correct permissions to create and manage relays. This identity is used by the relay to authenticate with Infisical and should be provisioned in advance. The relay supports several [machine identity auth methods](/documentation/platform/identities/machine-identities) for authentication, as listed below. Choose the one that best fits your environment and set the corresponding environment variables when deploying the relay. <AccordionGroup> <Accordion title="Universal Auth"> Simple and secure authentication using client ID and client secret.

    **Environment Variables:**
    - `INFISICAL_AUTH_METHOD=universal-auth`
    - `INFISICAL_UNIVERSAL_AUTH_CLIENT_ID=<client-id>`
    - `INFISICAL_UNIVERSAL_AUTH_CLIENT_SECRET=<client-secret>`
  </Accordion>

  <Accordion title="Token Auth">
    Direct authentication using a machine identity access token.

    **Environment Variables:**
    - `INFISICAL_TOKEN=<token>`
  </Accordion>

  <Accordion title="Native Kubernetes">
    Authentication using Kubernetes service account tokens.

    **Environment Variables:**
    - `INFISICAL_AUTH_METHOD=kubernetes`
    - `INFISICAL_MACHINE_IDENTITY_ID=<machine-identity-id>`
  </Accordion>

  <Accordion title="Native AWS IAM">
    Authentication using AWS IAM roles.

    **Environment Variables:**
    - `INFISICAL_AUTH_METHOD=aws-iam`
    - `INFISICAL_MACHINE_IDENTITY_ID=<machine-identity-id>`
  </Accordion>

  <Accordion title="Native GCP ID Token">
    Authentication using GCP identity tokens.

    **Environment Variables:**
    - `INFISICAL_AUTH_METHOD=gcp-id-token`
    - `INFISICAL_MACHINE_IDENTITY_ID=<machine-identity-id>`
  </Accordion>

  <Accordion title="GCP IAM">
    Authentication using GCP service account keys.

    **Environment Variables:**
    - `INFISICAL_AUTH_METHOD=gcp-iam`
    - `INFISICAL_MACHINE_IDENTITY_ID=<machine-identity-id>`
    - `INFISICAL_GCP_SERVICE_ACCOUNT_KEY_FILE_PATH=<path-to-key-file>`
  </Accordion>

  <Accordion title="Native Azure">
    Authentication using Azure managed identity.

    **Environment Variables:**
    - `INFISICAL_AUTH_METHOD=azure`
    - `INFISICAL_MACHINE_IDENTITY_ID=<machine-identity-id>`
  </Accordion>

  <Accordion title="OIDC Auth">
    Authentication using OIDC identity tokens.

    **Environment Variables:**
    - `INFISICAL_AUTH_METHOD=oidc-auth`
    - `INFISICAL_MACHINE_IDENTITY_ID=<machine-identity-id>`
    - `INFISICAL_JWT=<oidc-jwt>`
  </Accordion>

  <Accordion title="JWT Auth">
    Authentication using JWT tokens.

    **Environment Variables:**
    - `INFISICAL_AUTH_METHOD=jwt-auth`
    - `INFISICAL_MACHINE_IDENTITY_ID=<machine-identity-id>`
    - `INFISICAL_JWT=<jwt>`
  </Accordion>
</AccordionGroup>

</Step> <Step title="Provision a Server"> Provision a server or virtual machine where you plan to deploy the relay. This server must have a static IP address or DNS name to be identifiable by the Infisical platform. </Step> <Step title="Configure Network & Firewall"> Ensure your network and firewall settings allow the server to accept inbound connections and make outbound connections:

**Inbound Connections Rules:**
| Protocol | Source             | Port | Purpose                          |
| -------- | ------------------ | ---- | -------------------------------- |
| TCP      | Gateways           | 2222 | SSH reverse tunnel establishment |
| TCP      | Infisical instance host (US/EU, other) | 8443 | Platform-to-relay communication  |

**Outbound Connections Rules:**
| Protocol | Destination                          | Port | Purpose                                    |
| -------- | ------------------------------------ | ---- | ------------------------------------------ |
| TCP      | Infisical instance host (US/EU, other) | 443  | API communication and certificate requests |

</Step> <Step title="Select a Deployment Method"> You can deploy the Infisical Relay in various ways. This guide provides a manual setup example using the Infisical CLI. For an infrastructure-as-code approach, see our [Terraform guide](/documentation/platform/gateways/relay-deployment/terraform).

  The Infisical CLI is used to install and start the relay in your chosen environment. The CLI provides commands for both production and development scenarios, and supports a variety of options/flags to configure your deployment.

  To view all available flags and equivalent environment variables for relay deployment, see the [Relay CLI Command Reference](/cli/commands/relay).
<Tabs>
   <Tab title="Linux Server">
      For production deployments on Linux servers, install the Relay as a systemd service. This installation method only supports [Token Auth](/documentation/platform/identities/token-auth) at the moment.

      Once you have a [Token Auth](/documentation/platform/identities/token-auth) token, set the following environment variables for relay authentication:

      ```bash
      export INFISICAL_TOKEN=<your-machine-identity-token>
      ```

      <Warning>
        The systemd install command requires a Linux operating system with root/sudo privileges.
      </Warning>

      ```bash
      sudo infisical relay systemd install \
         --token <your-machine-identity-token> \
         --name <relay-name> \
         --domain <your-infisical-domain> \
         --host <static-ip-or-dns-of-the-server>

      # Start the relay service
      sudo systemctl start infisical-relay
      sudo systemctl enable infisical-relay
      ```
   </Tab>

   <Tab title="Other Environments">
      For non-Linux systems or when you need more control over the relay process:

      ```bash
      infisical relay start \
         --host=<host> \
         --name=<name> \
         --auth-method=<auth-method>
      ```

      This method supports all [machine identity auth methods](/documentation/platform/identities/machine-identities) and runs in the foreground. Suitable for production use on non-Linux systems or development environments.
      Set the appropriate environment variables for your chosen auth method as described in Step 1 before running the relay start command.
   </Tab>
</Tabs>

</Step> </Steps>

Frequently Asked Questions

<AccordionGroup> <Accordion title="Can the relay servers decrypt traffic going through them?"> No, relay servers cannot decrypt any traffic passing through them due to end-to-end encryption:

Client-to-Gateway mTLS (via TLS-pinned tunnel): Clients connect via a proxy that establishes a TLS-pinned tunnel to the gateway; mTLS between the client and gateway is negotiated inside this tunnel, encrypting all application traffic
SSH tunnel encryption: The mTLS-encrypted traffic is then transmitted through SSH reverse tunnels to relay servers
Double encryption: Traffic is encrypted twice - once by client mTLS and again by SSH tunnels
Relay only routes traffic: The relay server only routes the doubly-encrypted traffic without access to either encryption layer

The relay infrastructure is designed as a secure routing mechanism where only the client and gateway can decrypt the actual application traffic.

</Accordion> <Accordion title="What are the benefits of deploying my own relay?"> Deploying your own relay provides several advantages:

Dedicated resources: Full control over relay infrastructure and performance
Lower latency: Deploy closer to your gateways for optimal performance
Compliance: Meet specific data routing and compliance requirements
Custom network policies: Implement organization-specific network configurations
Geographic proximity: Reduce network congestion and improve response times to access resources
High availability: Deploy multiple relays for redundancy and load distribution

Organization-deployed relays give you complete control over your secure communication infrastructure.

</Accordion> <Accordion title="How do I troubleshoot connectivity issues?"> For detailed troubleshooting:

Platform cannot connect to relay:

Check firewall rules allow inbound TCP with TLS on port 8443
Test connectivity: openssl s_client -connect <relay-ip>:8443

Test network connectivity:

bash

# Test outbound API access from relay. Replace URL with your Infisical instance if self-hosted
curl -I https://app.infisical.com

# Test TCP with TLS port from platform
openssl s_client -connect <relay-ip>:8443

</Accordion> <Accordion title="What happens if my relay server goes down?"> Relay server outages affect gateway connectivity:

Gateway reconnection: Gateways will automatically attempt to reconnect when the relay comes back online
Service interruption: While the relay is down, the Infisical platform cannot reach gateways through that relay. As a result, any secrets or resources accessed via those gateways will be temporarily unavailable until connectivity is restored.
Multiple relays: Deploy multiple relay servers for redundancy and high availability
Automatic restart: Use systemd or container orchestration to automatically restart failed relay services

For production environments, consider deploying multiple relay servers to avoid single points of failure.

</Accordion> </AccordionGroup>