It is fairly easy to set up an unencrypted data flow from (Tested with NiFi 2.0.0-M1 and MiNiFi c++ to NiFi: 0.15.0.)
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If you want the data flow to use HTTPS, that is a bit more complicated; below is a description of how to do it. (Tested with NiFi 2.0.0-M1 and MiNiFi c++ 0.15.0.)
Step-by-step guide
- Install NiFi. When you a access https://<hostname>:8443/nifi
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- / the first time in your browser, you will get a "Potential Security Risk Ahead" warning about NiFi's self-signed certificate, but you can click Advanced → Accept the Risk and Continue.
- Create a NiFi flow with an Input Port. Double-click the Input Port, and note its ID (1342ea64-018d-1000-a5cf-7bda6830909b in the screenshot below.)
- Create a MiNiFi flow with a Remote Processing Group and an Input Port as shown in this example: https://github.com/apache/nifi-minifi-cpp/blob/main/examples/site_to_site_config.yml. Update
Remote Processing Groups/Input Ports/id
andConnections[0]/id
to the Input Port ID from NiFi, andRemote Processing Groups/Input Ports/url
to the NiFi URL you use to access NiFi in your browser.
- Create a self-signed certificate; there are many how-tos on the internet. Below, we'll assume that your generated files are /opt/certs/agent-cert.pem and /opt/certs/agent-key.pem; the CN of the certificate is "my-agent-ID".
Install NiFi. When you a access https://<hostname>:8443/nifi/ the first time in your browser, you will get a "Potential Security Risk Ahead" warning about NiFi's self-signed certificate, but you can click Advanced → Accept the Risk and Continue.
Add the following settings to your NiFi installation's
nifi.properties
file:Code Block # Site to Site properties nifi.remote.input.host=localhost nifi.remote.input.secure=true nifi.remote.input.socket.port=7777 nifi.remote.input.http.enabled=true
Note that the port you configure here, 7777 in this example, will be used internally by the site-to-site communication, but in the MiNiFi
config.yml
file, you should use the same NiFi address you use in your browser, NOT this site-to-site port.Export the NiFi certificate from the NiFi trust store, and import the MiNiFi agent certificate into the NiFi trust store:
Code Block keytool -exportcert -alias nifi-cert -rfc -keystore truststore.p12 > /opt/certs/nifi-cert.pem keytool -importcert -alias agent-cert -file /opt/certs/agent-cert.pem -keystore truststore.p12
keytool will prompt you for the truststore password; you can get this from the
nifi.properties
file.Add the agent ID (which is the CN of the agent certificate) as the "Initial User Identity 1" value in the "userGroupProvider" section of
authorizers.xml
in your NiFi installation:Code Block <userGroupProvider> <identifier>file-user-group-provider</identifier> <class>org.apache.nifi.authorization.FileUserGroupProvider</class> <property name="Users File">./conf/users.xml</property> <property name="Initial User Identity 1">my-agent-ID</property> </userGroupProvider>
and restart NiFi; it will create a new user in
users.xml
which looks like this:Code Block <tenants> <groups/> <users> <user identifier="9a889e09-6e86-360a-a324-8f3ee341842a" identity="my-agent-ID"/> </users> </tenants>
Add authorizations for your user in
authorizations.xml
in your NiFi installation, copying the user identifier fromusers.xml
:Code Block <authorizations> <policies> <policy identifier="1f6ae57a-08bc-11eb-9242-bf69163fde10" resource="/site-to-site" action="R"> <!-- copy the user identifier from users.xml --> <user identifier="9a889e09-6e86-360a-a324-8f3ee341842a"/> </policy> <policy identifier="282818e0-08bc-11eb-8508-2b51c9d70d42" resource="/site-to-site" action="W"> <user identifier="9a889e09-6e86-360a-a324-8f3ee341842a"/> </policy> <!-- copy the port identifier from the Input Port in NiFi into the resource string --> <policy identifier="f512f796-7afb-4c9f-ab68-b5eaf6d5d0cf" resource="/data-transfer/input-ports/c171f9da-689f-41e2-98c4-9d785c59c306" action="R"> <user identifier="9a889e09-6e86-360a-a324-8f3ee341842a"/> </policy> <policy identifier="b4e836ee-d526-4e16-8bf3-ee1d8fa3d5e6" resource="/data-transfer/input-ports/c171f9da-689f-41e2-98c4-9d785c59c306" action="W"> <user identifier="9a889e09-6e86-360a-a324-8f3ee341842a"/> </policy> <!-- you will also need a pair of policies for resource="/data-transfer/output-ports/..." if you want S2S data transfer from NiFi to MiNiFi --> </policies> </authorizations>
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Restart NiFi again, and test that you can connect to it using https:
Code Block # This should give a large HTML response curl -k --key /opt/certs/agent-key.pem --cert /opt/certs/agent-cert.pem https://<hostname>:8443/nifi/ # This should give a JSON response curl -k --key /opt/certs/agent-key.pem --cert /opt/certs/agent-cert.pem https://<hostname>:8443/nifi-api/site-to-site/
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Finally, configure MiNiFi to use secure site-to-site
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- Set up the certificates in
minifi.properties
:
Code Block nifi.remote.input.secure=true nifi.security.need.ClientAuth=true nifi.security.client.certificate=/opt/certs/agent-cert.pem nifi.security.client.private.key=/opt/certs/agent-key.pem nifi.security.client.pass.phrase=<key passphrase if any> nifi.security.client.ca.certificate=/opt/certs/nifi-cert.pem # These are not needed #nifi.rest.api.user.name= #nifi.rest.api.password=
Update the NiFi address in
config.yml
by changinghttp
tohttps
and changing the port to 8443 in the Remote Process Group:Code Block Remote Process Groups: - id: 1ca9d943-0175-1000-2188-4d25f7418459 name: https://<hostname>:8443/nifi/ url: https://<hostname>:8443/nifi/ comment: '' timeout: 30 secs yield period: 10 sec transport protocol: RAW proxy host: '' proxy port: '' proxy user: '' proxy password: '' local network interface: '' Input Ports: - id: c171f9da-689f-41e2-98c4-9d785c59c306 name: c171f9da-689f-41e2-98c4-9d785c59c306 comment: '' max concurrent tasks: 1 use compression: true Output Ports: []
And restart MiNiFi. Note that the site-to-site port you configured in NiFi will be used for communication, but in the MiNiFi
config.yml
you need to specify the main NiFi port 8443, NOT the site-to-site port (7777 in the example above).
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- Restart MiNiFi. It should be sending data to NiFi now. Congratulations!