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cluster: derive default machine name from its hostname when adding to cluster

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This commit is contained in:
Pasha Sviderski committed 2026-06-19 16:54:59 +10:00
1 parent e3823c29bf
commit 0c42a7df65
8 files changed
+350 -201
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cmd/uncloud/machine/add.go
+2 -1
View File
@@ -71,7 +71,8 @@ Connection methods:
return add(cmd.Context(), uncli, remoteMachine, opts)
},
}
cmd.Flags().StringVarP(&opts.name, "name", "n", "", "Assign a name to the machine.")
cmd.Flags().StringVarP(&opts.name, "name", "n", "",
"Assign a name to the machine. (default is the machine's hostname)")
cmd.Flags().BoolVar(
&opts.noCaddy, "no-caddy", false,
"Don't deploy Caddy reverse proxy service to the machine.",
cmd/uncloud/machine/init.go
+1 -1
View File
@@ -101,7 +101,7 @@ Connection methods:
"API endpoint for the Uncloud DNS service.")
cmd.Flags().StringVarP(
&opts.name, "name", "n", "",
"Assign a name to the machine.",
"Assign a name to the machine. (default is the machine's hostname)",
)
cmd.Flags().StringVar(
&opts.network, "network", cluster.DefaultNetwork.String(),
internal/cli/cli.go
+26 -6
View File
@@ -11,6 +11,7 @@ import (
"github.com/psviderski/uncloud/internal/cli/config"
"github.com/psviderski/uncloud/internal/machine"
"github.com/psviderski/uncloud/internal/machine/api/pb"
"github.com/psviderski/uncloud/internal/machine/cluster"
"github.com/psviderski/uncloud/internal/machine/network"
"github.com/psviderski/uncloud/internal/sshexec"
"github.com/psviderski/uncloud/pkg/api"
@@ -330,7 +331,7 @@ type AddMachineOptions struct {
// The cluster client is connected to the existing machine in the cluster. It was used to add the new machine to the
// cluster. The machine client is connected to the new machine and can be used to interact with it.
// Both client should be closed after use by the caller.
func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client.Client, *client.Client, error) {
func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (_ *client.Client, _ *client.Client, err error) {
contextName := cli.ContextOverrideOrCurrent()
c, err := cli.ConnectCluster(ctx)
if err != nil {
@@ -351,16 +352,19 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
machineClient.Close()
}
}()
// IMPORTANT: 'err' is a named return value so the deferred cleanups above observe it on every error return.
// Do not shadow it with ':=' in a nested scope, or the deferred client cleanup would be skipped on error.
// Check if the machine is already initialised as a cluster member and prompt the user to reset it first.
// TODO: refactor to use client.InspectMachine.
minfo, err := machineClient.Inspect(ctx, &emptypb.Empty{})
inspectResp, err := machineClient.MachineClient.InspectMachine(ctx, nil)
if err != nil {
return nil, nil, fmt.Errorf("inspect machine: %w", err)
}
minfo := inspectResp.Machines[0].Machine
if minfo.Id != "" {
// Check if the machine is already a member of this cluster.
machines, err := c.ListMachines(ctx, nil)
var machines api.MachineMembersList
machines, err = c.ListMachines(ctx, nil)
if err != nil {
return nil, nil, fmt.Errorf("list cluster machines: %w", err)
}
@@ -416,8 +420,24 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
endpoints[i] = pb.NewIPPort(addrPort)
}
}
// Default the machine name to the machine's hostname when not explicitly provided, ensuring it is
// unique within the cluster.
machineName := opts.MachineName
if machineName == "" {
var machines api.MachineMembersList
if machines, err = c.ListMachines(ctx, nil); err != nil {
return nil, nil, fmt.Errorf("list cluster machines: %w", err)
}
existing := make([]string, len(machines))
for i, m := range machines {
existing[i] = m.Machine.Name
}
if machineName, err = cluster.DefaultMachineName(minfo.Hostname, existing); err != nil {
return nil, nil, fmt.Errorf("generate machine name: %w", err)
}
}
addReq := &pb.AddMachineRequest{
Name: opts.MachineName,
Name: machineName,
Network: &pb.NetworkConfig{
Endpoints: endpoints,
PublicKey: token.PublicKey,
@@ -439,7 +459,7 @@ func (cli *CLI) AddMachine(ctx context.Context, opts AddMachineOptions) (*client
// Snapshot the cluster store version so the new machine can catch up before participating.
var storeVersion map[string]int64
inspectResp, err := c.MachineClient.InspectMachine(ctx, &emptypb.Empty{})
inspectResp, err = c.MachineClient.InspectMachine(ctx, &emptypb.Empty{})
if err != nil {
// TODO(lhf): remove Unimplemented check when v0.17.0 is released.
if status.Convert(err).Code() != codes.Unimplemented {
internal/machine/api/pb/machine.pb.go
+203 -192
View File
@@ -32,6 +32,8 @@ type MachineInfo struct {
Name string `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty"`
Network *NetworkConfig `protobuf:"bytes,3,opt,name=network,proto3" json:"network,omitempty"`
PublicIp *IP `protobuf:"bytes,4,opt,name=public_ip,json=publicIp,proto3" json:"public_ip,omitempty"`
// Operating system hostname of the machine.
Hostname string `protobuf:"bytes,5,opt,name=hostname,proto3" json:"hostname,omitempty"`
}
func (x *MachineInfo) Reset() {
@@ -94,6 +96,13 @@ func (x *MachineInfo) GetPublicIp() *IP {
return nil
}
func (x *MachineInfo) GetHostname() string {
if x != nil {
return x.Hostname
}
return ""
}
type NetworkConfig struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@@ -1131,7 +1140,7 @@ var file_internal_machine_api_pb_machine_proto_rawDesc = []byte{
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@@ -1139,201 +1148,203 @@ var file_internal_machine_api_pb_machine_proto_rawDesc = []byte{
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}
var (
internal/machine/api/pb/machine.proto
+2
View File
@@ -34,6 +34,8 @@ message MachineInfo {
string name = 2;
NetworkConfig network = 3;
IP public_ip = 4;
// Operating system hostname of the machine.
string hostname = 5;
}
message NetworkConfig {
internal/machine/cluster/machine.go
+45
View File
@@ -2,6 +2,8 @@ package cluster
import (
"fmt"
"slices"
"strings"
"github.com/psviderski/uncloud/internal/secret"
)
@@ -19,3 +21,46 @@ func NewRandomMachineName() (string, error) {
}
return "machine-" + suffix, nil
}
// DefaultMachineName derives a machine name from the given hostname, falling back to a random name if
// no valid name can be derived from it. It then ensures the name is unique among existing by appending
// a numeric suffix ("-1", "-2", etc.) if needed.
func DefaultMachineName(hostname string, existing []string) (string, error) {
name := machineNameFromHostname(hostname)
if name == "" {
var err error
if name, err = NewRandomMachineName(); err != nil {
return "", err
}
}
if !slices.Contains(existing, name) {
return name, nil
}
for i := 1; ; i++ {
candidate := fmt.Sprintf("%s-%d", name, i)
if !slices.Contains(existing, candidate) {
return candidate, nil
}
}
}
// machineNameFromHostname derives a machine name from a hostname.
// It returns an empty string if no valid name can be derived.
func machineNameFromHostname(hostname string) string {
// Use the first DNS label only, e.g. "web-1.example.com" becomes "web-1".
label, _, _ := strings.Cut(hostname, ".")
label = strings.ToLower(strings.TrimSpace(label))
var b strings.Builder
for _, r := range label {
switch {
case r >= 'a' && r <= 'z', r >= '0' && r <= '9', r == '-', r == '_':
b.WriteRune(r)
default:
b.WriteRune('-')
}
}
// Trim leading and trailing hyphens that may result from the sanitisation above.
return strings.Trim(b.String(), "-")
}
internal/machine/cluster/machine_test.go
+65
View File
@@ -0,0 +1,65 @@
package cluster
import (
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestMachineNameFromHostname(t *testing.T) {
t.Parallel()
tests := []struct {
name string
hostname string
want string
}{
{"simple", "web", "web"},
{"fqdn uses first label", "web-1.example.com", "web-1"},
{"uppercase lowercased", "Web-Server", "web-server"},
{"invalid chars replaced", "host_name@1", "host_name-1"},
{"trim surrounding hyphens", "-_host_-", "_host_"},
{"whitespace trimmed", " myhost ", "myhost"},
{"empty", "", ""},
{"only invalid chars", "@#", ""},
{"dot only", ".example.com", ""},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
assert.Equal(t, tt.want, machineNameFromHostname(tt.hostname))
})
}
}
func TestDefaultMachineName(t *testing.T) {
t.Parallel()
t.Run("falls back to random", func(t *testing.T) {
// An empty or fully invalid hostname falls back to a random "machine-xxxx" name.
got, err := DefaultMachineName("***", nil)
require.NoError(t, err)
assert.Regexp(t, `^machine-[a-zA-Z0-9]{4}$`, got)
})
tests := []struct {
name string
hostname string
existing []string
want string
}{
{"from hostname", "web-1.example.com", nil, "web-1"},
{"dedup against existing", "web", []string{"web"}, "web-1"},
{"dedup multiple", "web", []string{"web", "web-1"}, "web-2"},
{"sanitized", "My_Host", nil, "my_host"},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
got, err := DefaultMachineName(tt.hostname, tt.existing)
require.NoError(t, err)
assert.Equal(t, tt.want, got)
})
}
}
internal/machine/machine.go
+6 -1
View File
@@ -766,9 +766,11 @@ func (m *Machine) InitCluster(ctx context.Context, req *pb.InitClusterRequest) (
}
slog.Info("Cluster state initialised.", "network", clusterNetwork.String())
// Default the machine name to the machine's hostname when not explicitly provided.
machineName := req.MachineName
if machineName == "" {
if machineName, err = cluster.NewRandomMachineName(); err != nil {
hostname, _ := os.Hostname()
if machineName, err = cluster.DefaultMachineName(hostname, nil); err != nil {
return nil, status.Errorf(codes.Internal, "generate machine name: %v", err)
}
}
@@ -996,6 +998,8 @@ func (m *Machine) Inspect(_ context.Context, _ *emptypb.Empty) (*pb.MachineInfo,
}
func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.InspectMachineResponse, error) {
hostname, _ := os.Hostname()
storeVersion, err := m.store.Version(ctx)
if err != nil {
return nil, status.Errorf(codes.Internal, "get cluster store version: %v", err)
@@ -1016,6 +1020,7 @@ func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.Ins
Machine: &pb.MachineInfo{
Id: m.state.ID,
Name: m.state.Name,
Hostname: hostname,
Network: &pb.NetworkConfig{
Subnet: pb.NewIPPrefix(m.state.Network.Subnet),
ManagementIp: pb.NewIP(m.state.Network.ManagementIP),