Nginx Conf Generator

That tool uses client-go to communicate with multi Kubernetes clusters and gets the port of NodePort type service which contains specific annotation. Then modifies the Nginx configuration and reloads the Nginx process.

Prerequisites

nginx-conf-generator uses the kubeconfig file for authentication and authorization with Kubernetes cluster. You should ensure that given kubeconfig file has read only access on the target cluster.

Also nginx-conf-generator needs to reload nginx process when necessary, you must run it with root user.

Configuration

nginx-conf-generator can be customized with several command line arguments:

Usage:
  nginx-conf-generator [flags]

Flags:
      --custom-annotation string      annotation to specify selectable services (default "nginx-conf-generator/enabled")
  -h, --help                          help for nginx-conf-generator
      --kubeconfig-paths string       comma separated list of kubeconfig file paths to access with the cluster (default "/home/joshsagredo/.kube/config")
      --metrics-endpoint string       endpoint to provide prometheus metrics (default "/metrics")
      --metrics-port int              port of the metrics server (default 5000)
      --template-input-file string    path of the template input file to be able to render and print to --template-output-file (default "resources/ncg.conf.tmpl")
      --template-output-file string   rendered output file path which is a valid Nginx conf file (default "/etc/nginx/conf.d/ncg.conf")
  -v, --verbose                       verbose output of the logging library (default false)
      --version                       version for nginx-conf-generator
      --worker-node-label string      label to specify worker nodes (default "worker")

That tool should be run on a Linux host and the user who runs the binary file nginx-conf-generator should have permissions to edit --template-output-file file and reload nginx process using below command:

$ nginx -s reload

If you want to cover multiple kubernetes clusters, add comma seperated list of kubeconfig paths with --kubeconfig-paths argument.

Installation

Binary

Binary can be downloaded from Releases page.

After then, you can simply run binary by providing required command line arguments:

$ ./nginx-conf-generator --kubeconfig-paths=~/.kube/config1,~/.kube/config2 --custom-annotation nginx-conf-generator/enabled

Homebrew

This project can be installed with Homebrew:

brew tap bilalcaliskan/tap
brew install bilalcaliskan/tap/nginx-conf-generator

Development

This project requires below tools while developing:

• Golang 1.20
• pre-commit
• golangci-lint - required by pre-commit
• gocyclo - required by pre-commit

After you installed pre-commit, simply run below command to prepare your development environment:

$ pre-commit install -c build/ci/.pre-commit-config.yaml

License

Apache License 2.0