k3s: use random port for cluster API

Signed-off-by: Abiola Ibrahim <git@abiosoft.com>

environment/container/kubernetes/k3s.go

@@ -2,6 +2,7 @@ package kubernetes
 
 import (
 	"fmt"
+	"strconv"
 	"strings"
 
 	"github.com/abiosoft/colima/cli"
@@ -11,10 +12,13 @@ import (
 	"github.com/abiosoft/colima/environment/container/containerd"
 	"github.com/abiosoft/colima/environment/container/docker"
 	"github.com/abiosoft/colima/environment/vm/lima/limautil"
+	"github.com/abiosoft/colima/util"
 	"github.com/abiosoft/colima/util/downloader"
 	"github.com/sirupsen/logrus"
 )
 
+const listenPortKey = "k3s_listen_port"
+
 func installK3s(host environment.HostActions,
 	guest environment.GuestActions,
 	a *cli.ActiveCommandChain,
@@ -143,7 +147,6 @@ func installK3sCluster(
 	if ipAddress == "127.0.0.1" {
 		args = append(args, "--flannel-iface", "eth0")
 	} else {
-		args = append(args, "--bind-address", "0.0.0.0")
 		args = append(args, "--advertise-address", ipAddress)
 		args = append(args, "--flannel-iface", vmnet.NetInterface)
 	}
@@ -154,7 +157,32 @@ func installK3sCluster(
 	case containerd.Name:
 		args = append(args, "--container-runtime-endpoint", "unix:///run/containerd/containerd.sock")
 	}
+
+	a.Add(func() error {
+		port, err := getPortNumber(guest)
+		if err != nil {
+			return err
+		}
+		args = append(args, "--https-listen-port", strconv.Itoa(port))
+		return nil
+	})
+
 	a.Add(func() error {
 		return guest.Run("sh", "-c", "INSTALL_K3S_SKIP_DOWNLOAD=true INSTALL_K3S_SKIP_ENABLE=true k3s-install.sh "+strings.Join(args, " "))
 	})
 }
+
+// getPortNumber retrieves the previously set port number.
+// If missing, an available random port is set and return.
+func getPortNumber(guest environment.GuestActions) (int, error) {
+	if port, err := strconv.Atoi(guest.Get(listenPortKey)); err == nil && port > 0 {
+		return port, nil
+	}
+
+	port := util.RandomAvailablePort()
+	if err := guest.Set(listenPortKey, strconv.Itoa(port)); err != nil {
+		return 0, err
+	}
+
+	return port, nil
+}

environment/container/kubernetes/kubeconfig.go

@@ -53,6 +53,11 @@ func (c kubernetesRuntime) provisionKubeconfig(ctx context.Context) error {
 		// replace name
 		kubeconfig = strings.ReplaceAll(kubeconfig, ": default", ": "+profile)
 
+		// replace IP
+		if ip != "" && ip != "127.0.0.1" {
+			kubeconfig = strings.ReplaceAll(kubeconfig, "https://127.0.0.1:", "https://"+ip+":")
+		}
+
 		// save on the host
 		return c.host.Write(tmpkubeconfFile, []byte(kubeconfig))
 	})