Add router role for prodnxsr0020 (#536)

prodnxsr0020 runs FRR/OSPF hand-configured; bring its routing config under puppet without touching interfaces, firewall or dnsmasq.

- add roles::infra::network::router (base + frrouting + frr_exporter)
- enable ip_forward and disable rp_filter via sysctl::base
- add prodnxsr0020 OSPF config (dum0, dum1, bond0.201; src 198.18.21.160)
- pin dns, consul and router-id to dum0 instead of the WAN-facing primary IP
- listen sshd on 127.0.0.1 and dum0 only, knocking out the common WAN primary IP
- keep resolv.conf on the local dnsmasq (127.0.0.1)

Reviewed-on: #536
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

hieradata/nodes/prodnxsr0020.main.unkin.net.yaml

@@ -0,0 +1,45 @@
+---
+# primary interface is the WAN uplink; pin host identity to the dum0 loopback
+networking_loopback0_ip: 198.18.2.160
+networking_loopback1_ip: 198.18.21.160
+
+# dns: keep the local dnsmasq resolver
+profiles::dns::base::nameservers:
+  - 127.0.0.1
+profiles::dns::base::search:
+  - main.unkin.net
+profiles::dns::base::primary_interface: dum0
+profiles::dns::updater::deny_ranges:
+  - 198.18.199.0/24
+  - 198.18.200.0/24
+  - 10.42.0.0/16
+  - 10.43.0.0/16
+  - 10.10.12.0/24     # wg0
+  - 103.216.190.0/23  # wan uplink
+profiles::consul::client::host_addr: "%{hiera('networking_loopback0_ip')}"
+
+# ssh: listen on localhost and dum0 only; knock out the common wan primary ip
+lookup_options:
+  ssh::server::options:
+    merge:
+      strategy: deep
+      knockout_prefix: '--'
+ssh::server::options:
+  ListenAddress:
+    - "--%{facts.networking.ip}"
+    - 127.0.0.1
+    - "%{hiera('networking_loopback0_ip')}"
+profiles::ssh::sign::principals:
+  - "%{hiera('networking_loopback0_ip')}"
+
+# frrouting
+frrouting::ospfd_router_id: "%{hiera('networking_loopback0_ip')}"
+frrouting::ospfd_interfaces:
+  dum0:
+    area: 0.0.0.0
+  dum1:
+    area: 0.0.0.0
+  bond0.201:
+    area: 0.0.0.0
+frrouting::ospf_preferred_source_enable: true
+frrouting::ospf_preferred_source: "%{hiera('networking_loopback1_ip')}"

hieradata/roles/infra/network/router.yaml

@@ -0,0 +1,26 @@
+---
+hiera_include:
+  - frrouting
+  - exporters::frr_exporter
+
+# routing
+sysctl::base::values:
+  net.ipv4.ip_forward:
+    value: '1'
+  net.ipv4.conf.all.rp_filter:
+    value: '0'
+  net.ipv4.conf.default.rp_filter:
+    value: '0'
+
+# frrouting
+exporters::frr_exporter::enable: true
+frrouting::ospfd_redistribute:
+  - connected
+frrouting::daemons:
+  ospfd: true
+
+# consul
+profiles::consul::client::node_rules:
+  - resource: service
+    segment: frr_exporter
+    disposition: write

site/roles/manifests/infra/network/router.pp

@@ -0,0 +1,12 @@
+# roles::infra::network::router
+# an ospf router; frr only, interfaces and firewall are managed outside puppet
+#
+class roles::infra::network::router {
+  if $facts['firstrun'] {
+    include profiles::defaults
+    include profiles::firstrun::init
+  }else{
+    include profiles::defaults
+    include profiles::base
+  }
+}