NiFi Ingest 25.4
NiFi Ingest

# Example NiFi SSL Configuration

This page demonstrates how to generate your own custom certificate authority (CA), and create a NiFi server certificate that is signed by that CA.

## Create a Custom Certificate Authority

If you are deploying a NiFi instance for testing purposes, you might use self-signed certificates.

To create your own certificate authority (CA)

1. Generate a private key for the custom CA.

       openssl genpkey -algorithm RSA -out ca.key

2. Generate a certificate signing request.

       openssl req -new -key ca.key -out ca.csr

3. Generate the (self-signed) CA certificate.

       openssl x509 -req -days 365 -in ca.csr -key ca.key -out cacert.crt

   You now have the private key (`ca.key`) and CA certificate (`cacert.crt`) in PEM format.

## Create a Server Certificate for a NiFi Node

The following steps demonstrate how to generate a keystore for a NiFi node.

1. On the NiFi server, generate a private key for this node.

       openssl genpkey -algorithm RSA -out private.key

2. Generate a certificate signing request.

       openssl req -new -key private.key -out request.csr

   NOTE: When you provide the details for the CSR, you will be asked for a common name (CN). Ensure that you enter the fully-qualified domain name of the server (for example `nifi3.example.com`).

3. On the machine where you created your custom certificate authority, use the CSR and generate the certificate.

       openssl x509 -req -days 365 -in request.csr -CA cacert.crt -CAkey ca.key -out nifi-server.crt

   In this command:

   - `request.csr` is the certificate signing request (CSR) from the NiFi node.
   - `cacert.crt` is the certificate of your custom CA.
   - `ca.key` is the private key of your custom CA.
   - `nifi-server.crt` is the SSL certificate that is generated for the NiFi node. This certificate is signed by your custom CA, so will be trusted providing that the CA is trusted.

   These files are all in PEM format.

4. Return to the NiFi server and combine the node's private key and certificate together as a PKCS #12 keystore:

       openssl pkcs12 -export -inkey private.key -in nifi-server.crt -out nifi-keystore.p12

5. You now have everything you need to configure SSL for the NiFi node. Copy `nifi-keystore.p12` and the CA certificate (`cacert.crt`) to a suitable location and configure the relevant settings in `nifi.properties`.

       nifi.security.keystore=./conf/nifi-keystore.p12
       nifi.security.keystore.certificate=
       nifi.security.keystore.privateKey=
       nifi.security.keystoreType=PKCS12
       nifi.security.keystorePasswd=changeit
       nifi.security.keyPasswd=
       nifi.security.truststore=
       nifi.security.truststore.certificate=./conf/cacert.crt
       nifi.security.truststoreType=PEM
       nifi.security.truststorePasswd=

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Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery NiFi Ingest 25.4

Topic Title: Example NiFi SSL Configuration