Use service account's kube config to talk with the cluster

README.md

@@ -2,13 +2,17 @@
 
 # Calico Route Reflector Operator
 
-### This project is work in progress !!!
-
 ### Use your own risk !!!
 
-### Proposal documentation found here: https://github.com/mhmxs/calico-route-reflector-operator-proposal. Please feel free to share your ideas!!!
+### Proposal documentation found here: https://github.com/mhmxs/calico-route-reflector-operator-proposal. Please feel free to share your ideas !!!
+
+## Prerequisites
+
+ * Kubernetes cluster up and running
+ * Calico network on Kubernetes data store a.k.a. `KDD`.
+ * Configured Calico `BGPPeer`s one for route reflector mesh and an other for clients. [More info](https://docs.projectcalico.org/getting-started/kubernetes/hardway/configure-bgp-peering)
 
-This Kubernetes operator can monitor and scale Calico route refloctor pods based on cluster size. The operator has a few environment variable:
+This Kubernetes operator can monitor and scale Calico route refloctor pods based on node number per zone. The operator owns a few environment variables:
  * `ROUTE_REFLECTOR_CLUSTER_ID` Route reflector cluster ID, default `224.0.0.1`
  * `ROUTE_REFLECTOR_MIN` Minimum number of route reflector pods per zone, default `3`
  * `ROUTE_REFLECTOR_MAX` Maximum number of route reflector pods per zone, default `25`
@@ -33,6 +37,7 @@ Build your own image:
 
 ## Roadmap
 
+ * Etcd data store support
  * Use custom resource instead of environment variables
  * Dedicated or preferred node label
  * Disallow node label

config/manager/manager.yaml

@@ -30,8 +30,12 @@ spec:
         env:
           - name: DATASTORE_TYPE
             value: "kubernetes"
-          - name: KUBECONFIG
-            value: /root/.kube/config
+          - name: K8S_API_ENDPOINT
+            value: "https://kubernetes.default"
+          - name: K8S_CA_FILE
+            value: "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
+          - name: K8S_TOKEN_FILE
+            value: "/var/run/secrets/kubernetes.io/serviceaccount/token"
         image: controller:latest
         imagePullPolicy: Always
         name: manager

config/rbac/role.yaml

@@ -15,6 +15,13 @@ rules:
   - list
   - update
   - watch
+- apiGroups:
+  - projectcalico.org/v3
+  resources:
+  - nodes
+  verbs:
+  - list
+  - update
 - apiGroups:
   - route-reflector.calico-route-reflector-operator.mhmxs.github.com
   resources:

controllers/routereflectorconfig_controller.go

@@ -84,6 +84,7 @@ type reconcileImplClient interface {
 // +kubebuilder:rbac:groups=route-reflector.calico-route-reflector-operator.mhmxs.github.com,resources=routereflectorconfigs,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=route-reflector.calico-route-reflector-operator.mhmxs.github.com,resources=routereflectorconfigs/status,verbs=get;update;patch
 // +kubebuilder:rbac:groups="",resources=nodes,verbs=get;list;update;watch
+// +kubebuilder:rbac:groups="projectcalico.org/v3",resources=nodes,verbs=list;update
 
 func (r *RouteReflectorConfigReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 	_ = r.Log.WithValues("routereflectorconfig", req.Name)
@@ -137,8 +138,9 @@ func (r *RouteReflectorConfigReconciler) Reconcile(req ctrl.Request) (ctrl.Resul
 	expectedNumber := r.calculateExpectedNumber(readyNodes)
 	log.Infof("Expected number of route reflector nodes are %d", expectedNumber)
 
-	for n, isReady := range nodes {
+	for n := range nodes {
 		if status, ok := routeReflectorsUnderOperation[n.GetUID()]; ok {
+			// Node was under operation, better to revert it
 			if status {
 				delete(n.Labels, r.config.NodeLabelKey)
 			} else {
@@ -155,7 +157,9 @@ func (r *RouteReflectorConfigReconciler) Reconcile(req ctrl.Request) (ctrl.Resul
 
 			return nodeReverted, nil
 		}
+	}
 
+	for n, isReady := range nodes {
 		if !isReady || expectedNumber == actualReadyNumber {
 			continue
 		}

go.sum

@@ -10,6 +10,7 @@ github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEg
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@@ -40,13 +41,15 @@ github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kB
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@@ -142,6 +145,7 @@ github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7a
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+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
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@@ -156,6 +160,7 @@ github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
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@@ -179,13 +184,17 @@ github.com/googleapis/gnostic v0.3.1/go.mod h1:on+2t9HRStVgn95RSsFWFz+6Q0Snyqv1a
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@@ -197,6 +206,7 @@ github.com/imdario/mergo v0.3.5/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJ
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@@ -282,7 +292,6 @@ github.com/projectcalico/go-yaml-wrapper v0.0.0-20191112210931-090425220c54 h1:J
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@@ -308,6 +317,7 @@ github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAm
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@@ -331,12 +341,15 @@ github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJy
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@@ -503,6 +516,7 @@ gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
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@@ -512,6 +526,7 @@ gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/square/go-jose.v2 v2.2.2/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
+gopkg.in/tchap/go-patricia.v2 v2.2.6 h1:z5LKIoAsTWzQoJvMF+E2m7X0dSjzdA7IZz4bafkjMv0=
 gopkg.in/tchap/go-patricia.v2 v2.2.6/go.mod h1:GjlIhdM7u6RWBtv58iEuqTR4NOShCtHo2EeySnNeNfs=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
@@ -536,7 +551,6 @@ k8s.io/apiextensions-apiserver v0.17.2/go.mod h1:4KdMpjkEjjDI2pPfBA15OscyNldHWdB
 k8s.io/apimachinery v0.0.0-20191028221656-72ed19daf4bb/go.mod h1:llRdnznGEAqC3DcNm6yEj472xaFVfLM7hnYofMb12tQ=
 k8s.io/apimachinery v0.17.2 h1:hwDQQFbdRlpnnsR64Asdi55GyCaIP/3WQpMmbNBeWr4=
 k8s.io/apimachinery v0.17.2/go.mod h1:b9qmWdKlLuU9EBh+06BtLcSf/Mu89rWL33naRxs1uZg=
-k8s.io/apimachinery v0.18.3 h1:pOGcbVAhxADgUYnjS08EFXs9QMl8qaH5U4fr5LGUrSk=
 k8s.io/apiserver v0.17.2/go.mod h1:lBmw/TtQdtxvrTk0e2cgtOxHizXI+d0mmGQURIHQZlo=
 k8s.io/client-go v0.0.0-20191114101535-6c5935290e33/go.mod h1:4L/zQOBkEf4pArQJ+CMk1/5xjA30B5oyWv+Bzb44DOw=
 k8s.io/client-go v0.17.2 h1:ndIfkfXEGrNhLIgkr0+qhRguSD3u6DCmonepn1O6NYc=

main.go

@@ -20,10 +20,12 @@ import (
 	"errors"
 	"flag"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
 
+	calicoApiConfig "github.com/projectcalico/libcalico-go/lib/apiconfig"
 	calicoClient "github.com/projectcalico/libcalico-go/lib/clientv3"
 
 	"k8s.io/apimachinery/pkg/runtime"
@@ -94,13 +96,22 @@ func main() {
 		panic(err)
 	}
 
-	min, max, clusterID, ratio, nodeLabelKey, nodeLabelValue, zoneLabel := parseEnv()
-
-	cc, err := calicoClient.NewFromEnv()
+	calicoConfig := calicoApiConfig.NewCalicoAPIConfig()
+	calicoConfig.Spec = calicoApiConfig.CalicoAPIConfigSpec{
+		KubeConfig: calicoApiConfig.KubeConfig{
+			K8sAPIEndpoint: os.Getenv("K8S_API_ENDPOINT"),
+			K8sCAFile:      os.Getenv("K8S_CA_FILE"),
+			K8sAPIToken:    fetchAPIToken(os.Getenv("K8S_TOKEN_FILE")),
+		},
+	}
+	cc, err := calicoClient.New(*calicoConfig)
 	if err != nil {
 		setupLog.Error(err, "unable create Calico config from env")
 		panic(err)
 	}
+
+	min, max, clusterID, ratio, nodeLabelKey, nodeLabelValue, zoneLabel := parseEnv()
+
 	if err = (&controllers.RouteReflectorConfigReconciler{
 		Client:       mgr.GetClient(),
 		CalicoClient: cc,
@@ -189,3 +200,13 @@ func getKeyValue(label string) (string, string) {
 
 	return keyValue[0], keyValue[1]
 }
+
+func fetchAPIToken(path string) string {
+	content, err := ioutil.ReadFile(path)
+	if err != nil {
+		setupLog.Error(err, "unable to find token")
+		panic(err)
+	}
+
+	return string(content)
+}