Add a script to configure the DS and create an external frr container

Add a dev-env like script that configures both the external container
and the frr-k8s configuration.

Signed-off-by: Federico Paolinelli <[email protected]>

hack/external_frr.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+set -x
+
+NODES=$(kubectl get nodes -l node-role.kubernetes.io/worker=worker -o jsonpath={.items[*].status.addresses[?\(@.type==\"InternalIP\"\)].address})
+echo $NODES
+pushd ./hack/frr/
+go run . -nodes "$NODES"
+popd
+
+FRR_CONFIG=$(mktemp -d -t frr-XXXXXXXXXX)
+cp hack/frr/*.conf $FRR_CONFIG
+cp hack/frr/daemons $FRR_CONFIG
+chmod a+rw $FRR_CONFIG/*
+
+docker rm -f frr
+docker run -d --privileged --network kind --rm --ulimit core=-1 --name frr --volume "$FRR_CONFIG":/etc/frr quay.io/frrouting/frr:8.4.2
+
+FRR_IP=$(docker inspect -f "{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}" frr)
+
+
+cat <<EOF | kubectl apply -f -
+apiVersion: frrk8s.metallb.io/v1beta1
+kind: FRRConfiguration
+metadata:
+  name: frrconfiguration-sample
+  namespace: default
+spec:
+  bgp:
+    routers:
+    - asn: 64512
+      prefixes:
+      - 192.168.5.0/24
+      neighbors:
+      - asn: 64512
+        address: $FRR_IP
+        toAdvertise:
+          allowed:
+            prefixes:
+            - 192.168.5.0/24
+EOF

hack/frr/daemons

@@ -0,0 +1,80 @@
+# This file tells the frr package which daemons to start.
+#
+# Sample configurations for these daemons can be found in
+# /usr/share/doc/frr/examples/.
+#
+# ATTENTION:
+#
+# When activating a daemon for the first time, a config file, even if it is
+# empty, has to be present *and* be owned by the user and group "frr", else
+# the daemon will not be started by /etc/init.d/frr. The permissions should
+# be u=rw,g=r,o=.
+# When using "vtysh" such a config file is also needed. It should be owned by
+# group "frrvty" and set to ug=rw,o= though. Check /etc/pam.d/frr, too.
+#
+# The watchfrr and zebra daemons are always started.
+#
+bgpd=yes
+ospfd=no
+ospf6d=no
+ripd=no
+ripngd=no
+isisd=no
+pimd=no
+ldpd=no
+nhrpd=no
+eigrpd=no
+babeld=no
+sharpd=no
+pbrd=no
+bfdd=yes
+fabricd=no
+vrrpd=no
+
+#
+# If this option is set the /etc/init.d/frr script automatically loads
+# the config via "vtysh -b" when the servers are started.
+# Check /etc/pam.d/frr if you intend to use "vtysh"!
+#
+vtysh_enable=yes
+zebra_options="  -A 127.0.0.1 -s 90000000"
+bgpd_options="   -A 127.0.0.1"
+ospfd_options="  -A 127.0.0.1"
+ospf6d_options=" -A ::1"
+ripd_options="   -A 127.0.0.1"
+ripngd_options=" -A ::1"
+isisd_options="  -A 127.0.0.1"
+pimd_options="   -A 127.0.0.1"
+ldpd_options="   -A 127.0.0.1"
+nhrpd_options="  -A 127.0.0.1"
+eigrpd_options=" -A 127.0.0.1"
+babeld_options=" -A 127.0.0.1"
+sharpd_options=" -A 127.0.0.1"
+pbrd_options="   -A 127.0.0.1"
+staticd_options="-A 127.0.0.1"
+bfdd_options="   -A 127.0.0.1"
+fabricd_options="-A 127.0.0.1"
+vrrpd_options="  -A 127.0.0.1"
+
+# configuration profile
+#
+#frr_profile="traditional"
+#frr_profile="datacenter"
+
+#
+# This is the maximum number of FD's that will be available.
+# Upon startup this is read by the control files and ulimit
+# is called. Uncomment and use a reasonable value for your
+# setup if you are expecting a large number of peers in
+# say BGP.
+#MAX_FDS=1024
+
+# The list of daemons to watch is automatically generated by the init script.
+#watchfrr_options=""
+
+# for debugging purposes, you can specify a "wrap" command to start instead
+# of starting the daemon directly, e.g. to use valgrind on ospfd:
+#   ospfd_wrap="/usr/bin/valgrind"
+# or you can use "all_wrap" for all daemons, e.g. to use perf record:
+#   all_wrap="/usr/bin/perf record --call-graph -"
+# the normal daemon command is added to this at the end.

hack/frr/frr.conf

@@ -0,0 +1,49 @@
+! -*- bgp -*-
+!
+! BGPd sample configuration file
+!
+! $Id: bgpd.conf.sample,v 1.1 2002/12/13 20:15:29 paul Exp $
+!
+
+hostname bgpd
+password zebra
+!enable password please-set-at-here
+!
+!
+! NOTE: These NODE_IPs will be substituted with the IP addresses
+! assigned to the kind cluster NodesIP if they are different.
+! PROTOCOL will be substituted with either ipv4 or ipv6.
+!
+router bgp 64512
+ no bgp default ipv4-unicast
+ no bgp network import-check
+ neighbor 172.18.0.2 remote-as 64512
+ neighbor 172.18.0.4 remote-as 64512
+ address-family ipv4 unicast
+  neighbor 172.18.0.2 activate
+  neighbor 172.18.0.2 next-hop-self
+  neighbor 172.18.0.4 activate
+  neighbor 172.18.0.4 next-hop-self
+ exit-address-family
+
+!
+!router bgp 7675
+! bgp router-id 10.0.0.1
+! network 10.0.0.0/8
+! neighbor 10.0.0.2 remote-as 7675
+! neighbor 10.0.0.2 ebgp-multihop
+!
+! address-family ipv4 unicast
+!  neighbor 10.0.0.2 route-map set-nexthop out
+!  neighbor 10.0.0.2 next-hop-self
+! exit-address-family
+!
+! access-list all permit any
+!
+!route-map set-nexthop permit 10
+! match ip address all
+! set ip next-hop 10.0.0.1
+!
+!log file /var/log/bgpd.log
+!
+log stdout debugging

hack/frr/frr.conf.tmpl

@@ -0,0 +1,51 @@
+! -*- bgp -*-
+!
+! BGPd sample configuration file
+!
+! $Id: bgpd.conf.sample,v 1.1 2002/12/13 20:15:29 paul Exp $
+!
+
+hostname bgpd
+password zebra
+!enable password please-set-at-here
+!
+!
+! NOTE: These NODE_IPs will be substituted with the IP addresses
+! assigned to the kind cluster NodesIP if they are different.
+! PROTOCOL will be substituted with either ipv4 or ipv6.
+!
+router bgp 64512
+ no bgp default ipv4-unicast
+ no bgp network import-check
+
+{{- range $r := .NodesIP }}
+ neighbor {{ . }} remote-as 64512
+{{- end }}
+ address-family {{ .Protocol }} unicast
+{{- range $r := .NodesIP }}
+  neighbor {{ . }} activate
+  neighbor {{ . }} next-hop-self 
+{{- end }}
+ exit-address-family
+
+!
+!router bgp 7675
+! bgp router-id 10.0.0.1
+! network 10.0.0.0/8
+! neighbor 10.0.0.2 remote-as 7675
+! neighbor 10.0.0.2 ebgp-multihop
+!
+! address-family ipv4 unicast
+!  neighbor 10.0.0.2 route-map set-nexthop out
+!  neighbor 10.0.0.2 next-hop-self
+! exit-address-family
+!
+! access-list all permit any
+!
+!route-map set-nexthop permit 10
+! match ip address all
+! set ip next-hop 10.0.0.1
+!
+!log file /var/log/bgpd.log
+!
+log stdout debugging

hack/frr/main.go

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier:Apache-2.0
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"html/template"
+	"os"
+	"strings"
+)
+
+type BGPD struct {
+	NodesIP  []string
+	Protocol string
+}
+
+func main() {
+	nodeList := flag.String("nodes", "", "nodes ip")
+	flag.Parse()
+	fmt.Println(*nodeList)
+	data := BGPD{
+		NodesIP:  strings.Split(*nodeList, " "),
+		Protocol: "ipv4",
+	}
+
+	t, err := template.New("frr.conf.tmpl").ParseFiles("frr.conf.tmpl")
+	if err != nil {
+		panic(err)
+	}
+	f, err := os.Create("frr.conf")
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+	err = t.Execute(f, data)
+	if err != nil {
+		panic(err)
+	}
+}