Default no_host_uuid to true instead of false

client/config/config.go

@@ -210,6 +210,7 @@ func DefaultConfig() *Config {
 		GCDiskUsageThreshold:    80,
 		GCInodeUsageThreshold:   70,
 		GCMaxAllocs:             50,
+		NoHostUUID:              true,
 	}
 }
 

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

@@ -59,7 +59,7 @@ client {
     gc_disk_usage_threshold = 82
     gc_inode_usage_threshold = 91
     gc_max_allocs = 50
-    no_host_uuid = true
+    no_host_uuid = false
 }
 server {
 	enabled = true

command/agent/config.go

@@ -543,6 +543,7 @@ func DefaultConfig() *Config {
 			GCDiskUsageThreshold:  80,
 			GCInodeUsageThreshold: 70,
 			GCMaxAllocs:           50,
+			NoHostUUID:            true,
 		},
 		Server: &ServerConfig{
 			Enabled:          false,
@@ -995,7 +996,8 @@ func (a *ClientConfig) Merge(b *ClientConfig) *ClientConfig {
 	if b.GCMaxAllocs != 0 {
 		result.GCMaxAllocs = b.GCMaxAllocs
 	}
-	if b.NoHostUUID {
+	// NoHostUUID defaults to true, merge if false
+	if !b.NoHostUUID {
 		result.NoHostUUID = b.NoHostUUID
 	}
 

command/agent/config_parse_test.go

@@ -78,7 +78,7 @@ func TestConfig_Parse(t *testing.T) {
 					GCDiskUsageThreshold:  82,
 					GCInodeUsageThreshold: 91,
 					GCMaxAllocs:           50,
-					NoHostUUID:            true,
+					NoHostUUID:            false,
 				},
 				Server: &ServerConfig{
 					Enabled:           true,

demo/vagrant/client1.hcl

@@ -23,7 +23,6 @@ client {
     reserved {
        cpu = 500
     }
-    no_host_uuid = true
 }
 
 # Modify our port to avoid a collision with server1

demo/vagrant/client2.hcl

@@ -7,7 +7,6 @@ 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
@@ -18,7 +17,6 @@ client {
     meta {
         ssd = "true"
     }
-    no_host_uuid = true
 }
 
 # Modify our port to avoid a collision with server1 and client1

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

@@ -110,8 +110,9 @@ client {
   parallel destroys allowed by the garbage collector. This value should be
   relatively low to avoid high resource usage during garbage collections.
 
-- `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.
+- `no_host_uuid` `(bool: true)` - By default a random node UUID will be
+  generated, but setting this to `false` will use the system's UUID. Before
+  Nomad 0.6 the default was to use the system UUID.
 
 ### `chroot_env` Parameters
 

website/source/intro/getting-started/cluster.html.md

@@ -98,11 +98,6 @@ client {
     # this should be like "nomad.service.consul:4647" and a system
     # like Consul used for service discovery.
     servers = ["127.0.0.1:4647"]
-
-    # Since we are starting two clients on the same host, we need to set
-    # this in order to force nomad to generate client UUIDs randomly,
-    # instead of based on the host UUID.
-    no_host_uuid = true
 }
 
 # Modify our port to avoid a collision with server1