kube-named-ports

Declare GCP named ports on GKE node pools's instance groups according to Kubernetes services annotations.

Annotations

The services annotation is format is as such:

annotations:
  kube-named-ports.io/port-name: "newport6666"
  kube-named-ports.io/port-value: "6666"

Or you can add several ports in one annotation with an inline json dictionnary:

annotations:
  kube-named-ports.io/port-map: '{ "foo": 1234, "bar": 5678, "baz": 9876 }'

Build

Assuming you have go 1.13.4 (or up) :

make build

Usage

cluster is mandatory, the remaining can be automatically guessed when running in cluster, from hosts instance's metadata and serviceaccount.

Usage:
  kube-named-ports [flags]
  kube-named-ports [command]

Available Commands:
  help        Help about any command
  version     Print the version number

Flags:
  -s, --api-server string      kube api server url
  -n, --cluster string         cluster name (mandatory)
  -c, --config string          configuration file (default "/etc/knp/kube-named-ports.yaml")
  -d, --dry-run                dry-run mode
  -p, --healthcheck-port int   port for answering healthchecks
  -h, --help                   help for kube-named-ports
  -k, --kube-config string     kube config path
  -v, --log-level string       log level (default "debug")
  -o, --log-output string      log output (default "stderr")
  -r, --log-server string      log server (if using syslog)
  -j, --project string         project (optional when in cluster, can be found in host's metadata
  -i, --resync-interval int    resync interval in seconds (default 900)
  -z, --zone string            cluster zone name (optional, can be guessed)

Docker image

A ready to use, public docker image is available at Docker Hub, published at each release. You can use it directly from your Kubernetes deployments, ie.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: kube-named-ports
  namespace: kube-system
  labels:
    k8s-app: kube-named-ports
spec:
  selector:
    matchLabels:
      k8s-app: kube-named-ports
  replicas: 1
  template:
    metadata:
      labels:
        k8s-app: kube-named-ports
    spec:
      containers:
        - name: kube-named-ports
          image: bpineau/kube-named-ports:0.5.0
          args:
            - --cluster=MySuperCluster
            - --healthcheck-port=8080
          resources:
            requests:
              cpu: 0.1
              memory: 50Mi
            limits:
              cpu: 0.2
              memory: 100Mi
          livenessProbe:
            httpGet:
              path: /health
              port: 8080
            timeoutSeconds: 5
            initialDelaySeconds: 10