Allow random UUID

client/client.go

@@ -639,7 +639,7 @@ func (c *Client) getAllocRunners() map[string]*AllocRunner {
 func (c *Client) nodeID() (id, secret string, err error) {
 	var hostID string
 	hostInfo, err := host.Info()
-	if err == nil && helper.IsUUID(hostInfo.HostID) {
+	if !c.config.NoHostUUID && err == nil && helper.IsUUID(hostInfo.HostID) {
 		hostID = hostInfo.HostID
 	} else {
 		// Generate a random hostID if no constant ID is available on

client/config/config.go

@@ -165,6 +165,10 @@ type Config struct {
 
 	// LogLevel is the level of the logs to putout
 	LogLevel string
+
+	// NoHostUUID disables using the host's UUID and will force generation of a
+	// random UUID.
+	NoHostUUID bool
 }
 
 func (c *Config) Copy() *Config {

command/agent/agent.go

@@ -312,6 +312,7 @@ func (a *Agent) clientConfig() (*clientconfig.Config, error) {
 	conf.GCInterval = a.config.Client.GCInterval
 	conf.GCDiskUsageThreshold = a.config.Client.GCDiskUsageThreshold
 	conf.GCInodeUsageThreshold = a.config.Client.GCInodeUsageThreshold
+	conf.NoHostUUID = a.config.Client.NoHostUUID
 
 	return conf, nil
 }

command/agent/config-test-fixtures/basic.hcl

@@ -56,6 +56,7 @@ client {
     gc_interval = "6s"
     gc_disk_usage_threshold = 82
     gc_inode_usage_threshold = 91
+    no_host_uuid = true
 }
 server {
 	enabled = true

command/agent/config.go

@@ -209,6 +209,10 @@ type ClientConfig struct {
 	// GCInodeUsageThreshold is the inode usage threshold beyond which the Nomad
 	// client triggers GC of the terminal allocations
 	GCInodeUsageThreshold float64 `mapstructure:"gc_inode_usage_threshold"`
+
+	// NoHostUUID disables using the host's UUID and will force generation of a
+	// random UUID.
+	NoHostUUID bool `mapstructure:"no_host_uuid"`
 }
 
 // ServerConfig is configuration specific to the server mode
@@ -931,6 +935,9 @@ func (a *ClientConfig) Merge(b *ClientConfig) *ClientConfig {
 	if b.GCInodeUsageThreshold != 0 {
 		result.GCInodeUsageThreshold = b.GCInodeUsageThreshold
 	}
+	if b.NoHostUUID {
+		result.NoHostUUID = b.NoHostUUID
+	}
 
 	// Add the servers
 	result.Servers = append(result.Servers, b.Servers...)

command/agent/config_parse.go

@@ -344,6 +344,7 @@ func parseClient(result **ClientConfig, list *ast.ObjectList) error {
 		"gc_interval",
 		"gc_disk_usage_threshold",
 		"gc_inode_usage_threshold",
+		"no_host_uuid",
 	}
 	if err := checkHCLKeys(listVal, valid); err != nil {
 		return err

command/agent/config_parse_test.go

@@ -73,6 +73,7 @@ func TestConfig_Parse(t *testing.T) {
 					GCInterval:            6 * time.Second,
 					GCDiskUsageThreshold:  82,
 					GCInodeUsageThreshold: 91,
+					NoHostUUID:            true,
 				},
 				Server: &ServerConfig{
 					Enabled:           true,

demo/vagrant/client2.hcl

@@ -7,6 +7,7 @@ data_dir = "/tmp/client2"
 # Enable the client
 client {
     enabled = true
+    no_host_uuid = true
 
     # For demo assume we are talking to server1. For production,
     # this should be like "nomad.service.consul:4647" and a system

website/source/docs/agent/configuration/client.html.md

@@ -92,6 +92,9 @@ client {
 - `gc_inode_usage_threshold` `(float: 70)` - Specifies the inode usage percent
   which Nomad tries to maintain by garbage collecting terminal allocations.
 
+- `no_host_uuid` `(bool: false)` - Force the UUID generated by the client to be
+  randomly generated and not be based on the host's UUID.
+
 ### `chroot_env` Parameters
 
 Drivers based on [isolated fork/exec](/docs/drivers/exec.html) implement file