homelab/k8s/core/kube-system-custom/node-external-ip-labeler.yaml

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: node-external-ip-labeler
  namespace: kube-system
  labels:
    app: node-external-ip-labeler
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: node-external-ip-labeler
  labels:
    app: node-external-ip-labeler
rules:
  - apiGroups: [""]
    resources: ["nodes"]
    verbs: ["get", "list", "patch", "update"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: node-external-ip-labeler
  labels:
    app: node-external-ip-labeler
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: node-external-ip-labeler
subjects:
  - kind: ServiceAccount
    name: node-external-ip-labeler
    namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: node-external-ip-labeler
  namespace: kube-system
  labels:
    app: node-external-ip-labeler
rules:
  - apiGroups: ["batch"]
    resources: ["jobs"]
    verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: node-external-ip-labeler
  namespace: kube-system
  labels:
    app: node-external-ip-labeler
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: node-external-ip-labeler
subjects:
  - kind: ServiceAccount
    name: node-external-ip-labeler
    namespace: kube-system
---
apiVersion: batch/v1
kind: CronJob
metadata:
  name: node-external-ip-labeler
  namespace: kube-system
  labels:
    app: node-external-ip-labeler
spec:
  schedule: "17 3 * * *"
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 3
  jobTemplate:
    spec:
      backoffLimit: 1
      template:
        metadata:
          labels:
            app: node-external-ip-labeler
        spec:
          serviceAccountName: node-external-ip-labeler
          restartPolicy: Never
          tolerations:
            - operator: Exists
          containers:
            - name: fanout
              image: bitnami/kubectl:latest
              imagePullPolicy: IfNotPresent
              command:
                - /bin/bash
                - -lc
              args:
                - |
                  set -euo pipefail

                  clean_name() {
                    echo "$1" \
                      | tr '[:upper:]' '[:lower:]' \
                      | tr -c 'a-z0-9-' '-' \
                      | sed 's/^-*//;s/-*$//' \
                      | cut -c1-45
                  }

                  for NODE_NAME in $(kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\n"}{end}'); do
                    NODE_CLEAN="$(clean_name "${NODE_NAME}")"
                    JOB_NAME="node-external-ip-${NODE_CLEAN}"

                    kubectl delete job "${JOB_NAME}" -n kube-system --ignore-not-found=true --wait=true --timeout=60s

                    cat <<EOF | kubectl apply -f -
                  apiVersion: batch/v1
                  kind: Job
                  metadata:
                    name: ${JOB_NAME}
                    namespace: kube-system
                    labels:
                      app: node-external-ip-labeler
                      target-node: "${NODE_CLEAN}"
                  spec:
                    ttlSecondsAfterFinished: 86400
                    backoffLimit: 2
                    template:
                      metadata:
                        labels:
                          app: node-external-ip-labeler
                          target-node: "${NODE_CLEAN}"
                      spec:
                        serviceAccountName: node-external-ip-labeler
                        nodeName: "${NODE_NAME}"
                        hostNetwork: true
                        dnsPolicy: ClusterFirstWithHostNet
                        restartPolicy: Never
                        tolerations:
                          - operator: Exists
                        containers:
                          - name: label-node
                            image: bitnami/kubectl:latest
                            imagePullPolicy: IfNotPresent
                            env:
                              - name: NODE_NAME
                                value: "${NODE_NAME}"
                            command:
                              - /bin/bash
                              - -lc
                            args:
                              - |
                                set -euo pipefail

                                json_ip() {
                                  sed -n 's/.*"ip"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p'
                                }

                                IPV4="\$(curl -fsS --connect-timeout 10 --max-time 30 'https://api.ipify.org?format=json' | json_ip)"
                                IP64="\$(curl -fsS --connect-timeout 10 --max-time 30 'https://api64.ipify.org?format=json' | json_ip || true)"

                                if [ -z "\${IPV4}" ]; then
                                  echo "Unable to detect external IPv4 for node ${NODE_NAME}"
                                  exit 1
                                fi

                                kubectl label node "${NODE_NAME}" external-ipv4="\${IPV4}" --overwrite
                                kubectl annotate node "${NODE_NAME}" homelab.hexor.cy/external-ipv4="\${IPV4}" --overwrite

                                if echo "\${IP64}" | grep -q ':'; then
                                  kubectl annotate node "${NODE_NAME}" homelab.hexor.cy/external-ipv6="\${IP64}" --overwrite
                                elif [ -n "\${IP64}" ]; then
                                  kubectl annotate node "${NODE_NAME}" homelab.hexor.cy/external-ipv4-api64="\${IP64}" --overwrite
                                fi
                  EOF
                  done