Adding support to use environment variables to adjust hostname only

ingress

README.md

@@ -230,7 +230,7 @@ _See [helm upgrade](https://helm.sh/docs/helm/helm_upgrade/) for command documen
 
 ### Configurations
 
-There are other variables that can be set to a different value. For list of all the modifiable variables/values, take a look at './deploy/chart/values.yaml'. 
+There are other variables that can be set to a different value. For list of all the modifiable variables/values, take a look at './deploy/chart/values.yaml'.
 
 Values can be set/overrided by using the '--set var=value,...' flag or by passing in a custom-values.yaml using '-f custom-values.yaml'.
 

cloud/linode/loadbalancers.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"os"
 	"strconv"
 	"strings"
 	"time"
@@ -776,14 +777,26 @@ func makeLoadBalancerStatus(service *v1.Service, nb *linodego.NodeBalancer) *v1.
 		Hostname: *nb.Hostname,
 	}
 	if !getServiceBoolAnnotation(service, annLinodeHostnameOnlyIngress) {
-		ingress.IP = *nb.IPv4
+		if val := envBoolOptions("LINODE_HOSTNAME_ONLY_INGRESS"); val {
+			klog.Infof("LINODE_HOSTNAME_ONLY_INGRESS:  (%v)", val)
+		} else {
+			ingress.IP = *nb.IPv4
+		}
 	}
-
 	return &v1.LoadBalancerStatus{
 		Ingress: []v1.LoadBalancerIngress{ingress},
 	}
 }
 
+// Checks for a truth value in an environment variable
+func envBoolOptions(o string) bool {
+	boolValue, err := strconv.ParseBool(os.Getenv(o))
+	if err != nil {
+		return false
+	}
+	return boolValue
+}
+
 // getServiceNn returns the services namespaced name.
 func getServiceNn(service *v1.Service) string {
 	return fmt.Sprintf("%s/%s", service.Namespace, service.Name)

cloud/linode/loadbalancers_test.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"reflect"
 	"strconv"
 	"testing"
@@ -166,6 +167,10 @@ func TestCCMLoadBalancers(t *testing.T) {
 			name: "makeLoadBalancerStatus",
 			f:    testMakeLoadBalancerStatus,
 		},
+		{
+			name: "makeLoadBalancerStatusEnvVar",
+			f:    testMakeLoadBalancerStatusEnvVar,
+		},
 		{
 			name: "Cleanup does not call the API unless Service annotated",
 			f:    testCleanupDoesntCall,
@@ -1448,6 +1453,55 @@ func testMakeLoadBalancerStatus(t *testing.T, client *linodego.Client, _ *fakeAP
 	}
 }
 
+func testMakeLoadBalancerStatusEnvVar(t *testing.T, client *linodego.Client, _ *fakeAPI) {
+	ipv4 := "192.168.0.1"
+	hostname := "nb-192-168-0-1.newark.nodebalancer.linode.com"
+	nb := &linodego.NodeBalancer{
+		IPv4:     &ipv4,
+		Hostname: &hostname,
+	}
+
+	svc := &v1.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:        "test",
+			Annotations: make(map[string]string, 1),
+		},
+	}
+
+	expectedStatus := &v1.LoadBalancerStatus{
+		Ingress: []v1.LoadBalancerIngress{{
+			Hostname: hostname,
+			IP:       ipv4,
+		}},
+	}
+	status := makeLoadBalancerStatus(svc, nb)
+	if !reflect.DeepEqual(status, expectedStatus) {
+		t.Errorf("expected status for basic service to be %#v; got %#v", expectedStatus, status)
+	}
+
+	os.Setenv("LINODE_HOSTNAME_ONLY_INGRESS", "true")
+	expectedStatus.Ingress[0] = v1.LoadBalancerIngress{Hostname: hostname}
+	status = makeLoadBalancerStatus(svc, nb)
+	if !reflect.DeepEqual(status, expectedStatus) {
+		t.Errorf("expected status for %q annotated service to be %#v; got %#v", annLinodeHostnameOnlyIngress, expectedStatus, status)
+	}
+
+	os.Setenv("LINODE_HOSTNAME_ONLY_INGRESS", "false")
+	expectedStatus.Ingress[0] = v1.LoadBalancerIngress{Hostname: hostname}
+	status = makeLoadBalancerStatus(svc, nb)
+	if reflect.DeepEqual(status, expectedStatus) {
+		t.Errorf("expected status for %q annotated service to be %#v; got %#v", annLinodeHostnameOnlyIngress, expectedStatus, status)
+	}
+
+	os.Setenv("LINODE_HOSTNAME_ONLY_INGRESS", "banana")
+	expectedStatus.Ingress[0] = v1.LoadBalancerIngress{Hostname: hostname}
+	status = makeLoadBalancerStatus(svc, nb)
+	if reflect.DeepEqual(status, expectedStatus) {
+		t.Errorf("expected status for %q annotated service to be %#v; got %#v", annLinodeHostnameOnlyIngress, expectedStatus, status)
+	}
+	os.Unsetenv("LINODE_HOSTNAME_ONLY_INGRESS")
+}
+
 func testCleanupDoesntCall(t *testing.T, client *linodego.Client, fakeAPI *fakeAPI) {
 	region := "us-west"
 	nb1, err := client.CreateNodeBalancer(context.TODO(), linodego.NodeBalancerCreateOptions{Region: region})

deploy/chart/templates/daemonset.yaml

@@ -47,6 +47,7 @@ spec:
                 secretKeyRef:
                   name: ccm-linode
                   key: region
+            {{- toYaml .Values.env | nindent 12 }}
       volumes:
         - name: k8s
           hostPath:

deploy/chart/values.yaml

@@ -1,4 +1,4 @@
-# apiToken [Required] - Must be a Linode APIv4 Personal Access Token with all permissions. (https://cloud.linode.com/profile/tokens) 
+# apiToken [Required] - Must be a Linode APIv4 Personal Access Token with all permissions. (https://cloud.linode.com/profile/tokens)
 apiToken: ""
 
 # region [Required] - Must be a Linode region. (https://api.linode.com/v4/regions)
@@ -20,7 +20,7 @@ image:
 namespace: "kube-system"
 
 # Set of default tolerations
-tolerations: 
+tolerations:
  # The CCM can run on Nodes tainted as masters
   - key: "node-role.kubernetes.io/master"
     effect: "NoSchedule"
@@ -37,3 +37,9 @@ tolerations:
   - key: node.kubernetes.io/unreachable
     operator: Exists
     effect: NoSchedule
+# This section adds the ability to pass environment variables to adjust CCM defaults
+# https://github.com/linode/linode-cloud-controller-manager/blob/master/cloud/linode/loadbalancers.go
+# LINODE_HOSTNAME_ONLY_INGRESS type bool is supported
+# env:
+  # - name: EXAMPLE_ENV_VAR
+  #   value: "true"