update/lease-namespace (#140)

* "Add lease namespace flag to NewConfig function and use it in main for lock creation"

* Added support for creating, getting, and deleting leases in coordination.k8s.io API group. Also added flags for lease duration and namespace.

Author: alexei-led

README.md

@@ -66,6 +66,9 @@ rules:
   - apiGroups: [ "" ]
     resources: [ "nodes" ]
     verbs: [ "get" ]
+  - apiGroups: [ "coordination.k8s.io" ]
+    resources: [ "leases" ]
+    verbs: [ "create", "get", "delete" ]
 
 ---
 apiVersion: rbac.authorization.k8s.io/v1
@@ -230,6 +233,8 @@ OPTIONS:
    --release-on-exit                  release the static public IP address on exit (default: true) [$RELEASE_ON_EXIT]
    --retry-attempts value             number of attempts to assign the static public IP address (default: 10) [$RETRY_ATTEMPTS]
    --retry-interval value             when the agent fails to assign the static public IP address, it will retry after this interval (default: 5m0s) [$RETRY_INTERVAL]
+   --lease-duration value             duration of the kubernetes lease (default: 5) [$LEASE_DURATION]
+   --lease-namespace value            namespace of the kubernetes lease (default: "default") [$LEASE_NAMESPACE]
 
    Development
 

cmd/main.go

@@ -91,7 +91,7 @@ func assignAddress(c context.Context, log *logrus.Entry, client kubernetes.Inter
 	defer ticker.Stop()
 
 	// create new cluster wide lock
-	lock := lease.NewKubeLeaseLock(client, kubeipLockName, "default", node.Instance, cfg.LeaseDuration)
+	lock := lease.NewKubeLeaseLock(client, kubeipLockName, cfg.LeaseNamespace, node.Instance, cfg.LeaseDuration)
 
 	for retryCounter := 0; retryCounter <= cfg.RetryAttempts; retryCounter++ {
 		log.WithFields(logrus.Fields{
@@ -293,6 +293,13 @@ func main() {
 						EnvVars:  []string{"LEASE_DURATION"},
 						Category: "Configuration",
 					},
+					&cli.StringFlag{
+						Name:     "lease-namespace",
+						Usage:    "namespace of the kubernetes lease",
+						EnvVars:  []string{"LEASE_NAMESPACE"},
+						Value:    "default", // default namespace
+						Category: "Configuration",
+					},
 					&cli.BoolFlag{
 						Name:     "release-on-exit",
 						Usage:    "release the static public IP address on exit",

internal/config/config.go

@@ -31,6 +31,8 @@ type Config struct {
 	ReleaseOnExit bool `json:"release-on-exit"`
 	// LeaseDuration is the duration of the kubernetes lease
 	LeaseDuration int `json:"lease-duration"`
+	// LeaseNamespace is the namespace of the kubernetes lease
+	LeaseNamespace string `json:"lease-namespace"`
 }
 
 func NewConfig(c *cli.Context) *Config {
@@ -47,5 +49,6 @@ func NewConfig(c *cli.Context) *Config {
 	cfg.IPv6 = c.Bool("ipv6")
 	cfg.ReleaseOnExit = c.Bool("release-on-exit")
 	cfg.LeaseDuration = c.Int("lease-duration")
+	cfg.LeaseNamespace = c.String("lease-namespace")
 	return &cfg
 }