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# Docker Image Quickstart

## Capabilities
This image currently supports running in standalone mode either unsecured or with Two-Way SSL.

More capabilities will continue to be added and made available from the 

## Building
The Docker image can be built using the following command:

    docker build -t apache/nifi:latest .

This build will result in an image tagged apache/nifi:latest

    # user @ puter in ~/Development/code/apache/nifi/nifi-docker/dockerhub
    $ docker images
    REPOSITORY               TAG                 IMAGE ID            CREATED                 SIZE
    apache/nifi              latest              f0f564eed149        A long, long time ago   1.62GB

**Note**: The default version of NiFi specified by the Dockerfile is typically that of one that is unreleased if working from source.
To build an image for a prior released version, one can override the `NIFI_VERSION` build-arg with the following command:
    
    docker build --build-arg=NIFI_VERSION={Desired NiFi Version} -t apache/nifi:latest .

There is, however, no guarantee that older versions will work as properties have changed and evolved with subsequent releases.
The configuration scripts are suitable for at least 1.4.0+.

## Running a container

### Standalone Instance, Unsecured
The minimum to run a NiFi instance is as follows:

    docker run --name nifi \
      -p 18080:8080 \
      -d \
      apache/nifi:latest
      
This will provide a running instance, exposing the instance UI to the host system on at port 18080,
viewable at `http://localhost:18080/nifi`.
        
### Standalone Instance, Two-Way SSL
In this configuration, the user will need to provide certificates and the associated configuration information.
Of particular note, is the `AUTH` environment variable which is set to `tls`.  Additionally, the user must provide an
the DN as provided by an accessing client certificate in the `INITIAL_ADMIN_IDENTITY` environment variable.
This value will be used to seed the instance with an initial user with administrative privileges.
Finally, this command makes use of a volume to provide certificates on the host system to the container instance.

    docker run --name nifi \
      -v /User/dreynolds/certs/localhost:/opt/certs \
      -p 18443:8443 \
      -e AUTH=tls \
      -e KEYSTORE_PATH=/opt/certs/keystore.jks \
      -e KEYSTORE_TYPE=JKS \
      -e KEYSTORE_PASSWORD=QKZv1hSWAFQYZ+WU1jjF5ank+l4igeOfQRp+OSbkkrs \
      -e TRUSTSTORE_PATH=/opt/certs/truststore.jks \
      -e TRUSTSTORE_PASSWORD=rHkWR1gDNW3R9hgbeRsT3OM3Ue0zwGtQqcFKJD2EXWE \
      -e TRUSTSTORE_TYPE=JKS \
      -e INITIAL_ADMIN_IDENTITY='CN=Random User, O=Apache, OU=NiFi, C=US' \
      -d \
      apache/nifi:latest


## Configuration Information
The following ports are specified by the Docker container for NiFi operation within the container and 
can be published to the host.

| Function                 | Property                      | Port  |
|--------------------------|-------------------------------|-------|
| HTTP Port                | nifi.web.http.port            | 8080  |
| HTTPS Port               | nifi.web.https.port           | 8443  |
| Remote Input Socket Port | nifi.remote.input.socket.port | 10000 |