Building the Ingress Controller Image

This document explains how to build an Ingress Controller image using the source code. You can also use pre-built images: please see here and here for details on how to pull the NGINX Ingress Controller based on NGINX Plus from the F5 Docker registry; for NGINX Ingress Controller based on NGINX OSS, we provide the images through DockerHub and GitHub Container.

Prerequisites

Before you can build the image, make sure that the following software is installed on your machine:

Docker v18.09+
GNU Make
git
OpenSSL, optionally, if you would like to generate a self-signed certificate and a key for the default server.
For NGINX Plus, you must have the NGINX Plus license – the certificate (nginx-repo.crt) and the key (nginx-repo.key).

Although the Ingress Controller is written in golang, golang is not required, you have the option to download the binary or to build the Ingress Controller in a Docker container.

Building the Image and Pushing It to the Private Registry

We build the image using the make utility and the provided Makefile. Let’s create the Ingress Controller binary, build an image and push the image to the private registry.

Note: If you have a local golang environment and you want to build the binary, you can remove TARGET=download from the make commands. If you want to build the binary, but you don’t have a local golang environment you can use TARGET=container.

Make sure to run the docker login command first to log in to the registry.

If you’re using Google Container Registry, make sure you’re logged into the gcloud tool by running the gcloud auth login and gcloud auth configure-docker commands.

Clone the Ingress Controller repo:

$ git clone https://github.com/nginxinc/kubernetes-ingress/
$ cd kubernetes-ingress
$ git checkout v2.1.0

Build the image:
- For NGINX:
```
$ make debian-image PREFIX=myregistry.example.com/nginx-ingress TARGET=download
```
  or if you wish to use alpine
```
$ make alpine-image PREFIX=myregistry.example.com/nginx-ingress TARGET=download
```
  myregistry.example.com/nginx-ingress defines the repo in your private registry where the image will be pushed. Substitute that value with the repo in your private registry.
  
  As a result, the image myregistry.example.com/nginx-ingress:2.1.0 is built. Note that the tag 2.1.0 comes from the VERSION variable, defined in the Makefile.
- For NGINX Plus, first, make sure that the certificate (nginx-repo.crt) and the key (nginx-repo.key) of your license are located in the root of the project:
```
$ ls nginx-repo.*
nginx-repo.crt  nginx-repo.key
```
  Then run:
```
$ make debian-image-plus PREFIX=myregistry.example.com/nginx-plus-ingress TARGET=download
```
  myregistry.example.com/nginx-plus-ingress defines the repo in your private registry where the image will be pushed. Substitute that value with the repo in your private registry.
  
  As a result, the image myregistry.example.com/nginx-plus-ingress:2.1.0 is built. Note that the tag 2.1.0 comes from the VERSION variable, defined in the Makefile.
  
  Note: In the event of a patch version of NGINX Plus being released, make sure to rebuild your image to get the latest version. If your system is caching the Docker layers and not updating the packages, add DOCKER_BUILD_OPTIONS="--pull --no-cache" to the make command.
Push the image:
```
$ make push PREFIX=myregistry.example.com/nginx-ingress
```
Note: If you’re using a different tag, append TAG=your-tag to the command above.

Next you will find the details about available Makefile targets and variables.

Makefile Targets

You can see a list of all the targets by running make without any target or make help

Below you can find some of the most useful targets in the Makefile:

build: creates the Ingress Controller binary using the local golang environment (ignored when TARGET is container).
alpine-image: for building an alpine-based image with NGINX.
alpine-image-plus: for building an alpine-based image with NGINX Plus.
debian-image: for building a debian-based image with NGINX.
debian-image-plus: for building a debian-based image with NGINX Plus.
debian-image-nap-plus: for building a debian-based image with NGINX Plus and the appprotect module.
debian-image-dos-plus: for building a debian-based image with NGINX Plus and the appprotect-dos module.
debian-image-nap-dos-plus: for building a debian-based image with NGINX Plus appprotect and appprotect-dos modules.
debian-image-opentracing: for building a debian-based image with NGINX, opentracing module and the Jaeger tracer.
debian-image-opentracing-plus: for building a debian-based image with NGINX Plus, opentracing module and the Jaeger tracer.
openshift-image: for building an ubi-based image with NGINX for Openshift clusters.
openshift-image-plus: for building an ubi-based image with NGINX Plus for Openshift clusters.
openshift-image-nap-plus: for building an ubi-based image with NGINX Plus and the appprotect module for Openshift clusters.
openshift-image-dos-plus: for building an ubi-based image with NGINX Plus and the appprotect_dos module for Openshift clusters.
openshift-image-nap-dos-plus: for building an ubi-based image with NGINX Plus, appprotect and the appprotect_dos module for Openshift clusters. Note: You need to store your RHEL organization and activation keys in a file named rhel_license in the project root. Example:
```
RHEL_ORGANIZATION=1111111
RHEL_ACTIVATION_KEY=your-key
```

A few other useful targets:

push: pushes the image to the Docker registry specified in PREFIX and TAG variables.
all: executes test test, lint, verify-codegen, update-crds and debian-image. If one of the targets fails, the execution process stops, reporting an error.
test: runs unit tests.
certificate-and-key: The Ingress Controller requires a certificate and a key for the default HTTP/HTTPS server. You can reference them in a TLS Secret in a command-line argument to the Ingress Controller. As an alternative, you can add a file in the PEM format with your certificate and key to the image as /etc/nginx/secrets/default. Optionally, you can generate a self-signed certificate and a key using this target. Note that you must add the ADD instruction in the Dockerfile to copy the cert and the key to the image.

Makefile Variables

The Makefile contains the following main variables for you to customize (either by changing the Makefile or by overriding the variables in the make command):

PREFIX – the name of the image. The default is nginx/nginx-ingress.
TAG – the tag added to the image. It’s set to the version of the Ingress Controller by default.
DOCKER_BUILD_OPTIONS – the options for the docker build command. For example, --pull.
TARGET – By default, the Ingress Controller is compiled locally using a local golang environment. If you want to compile the Ingress Controller using your local golang environment, make sure that the Ingress Controller repo is in your $GOPATH. To compile the Ingress Controller using the Docker golang container, specify TARGET=container. If you checked out a tag or are on the latest commit on master you can specify TARGET=download to avoid compiling the binary.