DnsServers using get_attr

Nameservers are configured on the ctlplane subnets by the
undercloud installer, the nameservers are used early during
the deployment, prior to running os-net-config.

Remove the default DnsServer's in THT, replacing it with
an empty list and use get_attr to get the values for
DnsServers for the overcloud from the ctlplane subnet(s).

A conditinal is used in  puppet/role.role.j2.yaml so that
the parameter value is used whenever it is not [] (default)
to provide backwards compatibilityi and in case the user
want to use different DnsServers for the overcloud and
undercloud.

Partial: blueprint tripleo-routed-networks-templates
Change-Id: I5f33e06ca3f4b13cc355e02156edd9d8a1f773cd

ci/common/net-config-multinode-os-net-config.yaml

@@ -52,6 +52,13 @@ parameters:
     default: 1300
     description: The mtu of the OvS bridge
     type: number
+  DnsServers: # Override this via parameter_defaults
+    default: []
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
+    type: comma_delimited_list
   EC2MetadataIp:
     default: ''
     description: The IP address of the EC2 metadata server. (The parameter

ci/common/net-config-multinode.yaml

@@ -48,6 +48,13 @@ parameters:
     description: The default route of the control plane network. (The parameter
       is automatically resolved from the ctlplane subnet's gateway_ip attribute.)
     type: string
+  DnsServers: # Override this via parameter_defaults
+    default: []
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
+    type: comma_delimited_list
   EC2MetadataIp:
     default: ''
     description: The IP address of the EC2 metadata server. (The parameter

ci/common/net-config-simple-bridge.yaml

@@ -41,6 +41,13 @@ parameters:
     default: ''
     description: IP address/subnet on the management network
     type: string
+  DnsServers: # Override this via parameter_defaults
+    default: []
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
+    type: comma_delimited_list
   EC2MetadataIp:
     default: ''
     description: The IP address of the EC2 metadata server. (The parameter

ci/environments/network/multiple-nics-ipv6/network-environment.yaml

@@ -18,4 +18,3 @@ parameter_defaults:
   StorageMgmtAllocationPools: [{"start": "fd00:fd00:fd00:4000::10", "end": "fd00:fd00:fd00:4000:ffff:ffff:ffff:fffe"}]
   TenantNetCidr: 172.16.0.0/24
   TenantAllocationPools: [{"start": "172.16.0.10", "end": "172.16.0.250"}]
-  DnsServers: ["8.8.8.8", "8.8.4.4"]

ci/environments/network/multiple-nics-ipv6/nic-configs/ceph-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics-ipv6/nic-configs/cinder-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics-ipv6/nic-configs/compute.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics-ipv6/nic-configs/controller.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics-ipv6/nic-configs/swift-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics/network-environment.yaml

@@ -19,4 +19,3 @@ parameter_defaults:
   StorageMgmtAllocationPools: [{"start": "172.19.0.10", "end": "172.19.0.250"}]
   TenantNetCidr: 172.16.0.0/24
   TenantAllocationPools: [{"start": "172.16.0.10", "end": "172.16.0.250"}]
-  DnsServers: ["8.8.8.8", "8.8.4.4"]

ci/environments/network/multiple-nics/nic-configs/ceph-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics/nic-configs/cinder-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics/nic-configs/compute.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics/nic-configs/controller.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/multiple-nics/nic-configs/swift-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/public-bond/network-environment.yaml

@@ -18,5 +18,4 @@ parameter_defaults:
   StorageMgmtAllocationPools: [{"start": "172.19.0.10", "end": "172.19.0.250"}]
   TenantNetCidr: 172.16.0.0/24
   TenantAllocationPools: [{"start": "172.16.0.10", "end": "172.16.0.250"}]
-  DnsServers: ["8.8.8.8", "8.8.4.4"]
   BondInterfaceOvsOptions: bond_mode=balance-slb

ci/environments/network/public-bond/nic-configs/ceph-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/public-bond/nic-configs/cinder-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/public-bond/nic-configs/compute.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/public-bond/nic-configs/controller.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''

ci/environments/network/public-bond/nic-configs/swift-storage.yaml

@@ -75,7 +75,10 @@ parameters:
     type: string
   DnsServers: # Override this via parameter_defaults
     default: []
-    description: A list of DNS servers (2 max for some implementations) that will be added to resolv.conf.
+    description: >
+      DNS servers to use for the Overcloud (2 max for some implementations).
+      If not set the nameservers configured in the ctlplane subnet's
+      dns_nameservers attribute will be used.
     type: comma_delimited_list
   EC2MetadataIp:
     default: ''