fix: reserve the apid and trustd ports from the ephemeral port range

The problem is that ports 50000 and 50001 are part of the ephemeral port
range, so they might be occupied by outgoing connections before
`apid`/`trustd` has a chance to bind to it.

So ensure these two ports are always excluded from the ephemeral port
range.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

Author: smira

internal/app/machined/pkg/controllers/runtime/kernel_param_defaults.go

@@ -7,6 +7,7 @@ package runtime
 import (
 	"context"
 	"errors"
+	"fmt"
 	"os"
 
 	"github.com/cosi-project/runtime/pkg/controller"
@@ -15,6 +16,7 @@ import (
 
 	v1alpha1runtime "github.com/siderolabs/talos/internal/app/machined/pkg/runtime"
 	"github.com/siderolabs/talos/pkg/kernel/kspp"
+	"github.com/siderolabs/talos/pkg/machinery/constants"
 	"github.com/siderolabs/talos/pkg/machinery/kernel"
 	"github.com/siderolabs/talos/pkg/machinery/resources/runtime"
 )
@@ -88,6 +90,14 @@ func (ctrl *KernelParamDefaultsController) getKernelParams() []*kernel.Param {
 		},
 	}
 
+	// block apid and trustd from the ephemeral port range
+	res = append(res, []*kernel.Param{
+		{
+			Key:   "proc.sys.net.ipv4.ip_local_reserved_ports",
+			Value: fmt.Sprintf("%d,%d", constants.ApidPort, constants.TrustdPort),
+		},
+	}...)
+
 	if ctrl.V1Alpha1Mode != v1alpha1runtime.ModeContainer {
 		res = append(res, []*kernel.Param{
 			{

internal/app/machined/pkg/controllers/runtime/kernel_param_defaults_test.go

@@ -48,6 +48,10 @@ func getParams(mode runtime.Mode) []*kernel.Param {
 			Key:   "proc.sys.vm.overcommit_memory",
 			Value: "1",
 		},
+		{
+			Key:   "proc.sys.net.ipv4.ip_local_reserved_ports",
+			Value: "50000,50001",
+		},
 	}
 
 	if mode != runtime.ModeContainer {