Add e2e test about dnscache

Signed-off-by: Manuel Buil <mbuil@suse.com>

tests/e2e/dnscache/Vagrantfile

@@ -0,0 +1,99 @@
+ENV['VAGRANT_NO_PARALLEL'] = 'no'
+NODE_ROLES = (ENV['E2E_NODE_ROLES'] || ["server-0", "agent-0" ])
+NODE_BOXES = (ENV['E2E_NODE_BOXES'] || ['generic/ubuntu2004', 'generic/ubuntu2004'])
+GITHUB_BRANCH = (ENV['E2E_GITHUB_BRANCH'] || "release-1.26")
+RELEASE_VERSION = (ENV['E2E_RELEASE_VERSION'] || "")
+NODE_CPUS = (ENV['E2E_NODE_CPUS'] || 2).to_i
+NODE_MEMORY = (ENV['E2E_NODE_MEMORY'] || 3072).to_i
+CNI = (ENV['E2E_CNI'] || "canal") # canal, cilium and calico supported
+NETWORK4_PREFIX = "10.10.10"
+NETWORK6_PREFIX = "fd11:decf:c0ff:ee"
+install_type = ""
+
+def provision(vm, roles, role_num, node_num)
+  vm.box = NODE_BOXES[node_num]
+  vm.hostname = "#{roles[0]}-#{role_num}"
+  node_ip4 = "#{NETWORK4_PREFIX}.#{100+node_num}"
+  node_ip6 = "#{NETWORK6_PREFIX}::#{10+node_num}"
+  node_ip6_gw = "#{NETWORK6_PREFIX}::1"
+  # Only works with libvirt, which allows IPv4 + IPv6 on a single network/interface
+  vm.network "private_network", 
+    :ip => node_ip4,
+    :netmask => "255.255.255.0",
+    :libvirt__dhcp_enabled => false,
+    :libvirt__forward_mode => "none",
+    :libvirt__guest_ipv6 => "yes",
+    :libvirt__ipv6_address => "#{NETWORK6_PREFIX}::1",
+    :libvirt__ipv6_prefix => "64"
+
+  vagrant_defaults = File.exists?("./vagrantdefaults.rb") ? "./vagrantdefaults.rb" : "../vagrantdefaults.rb"
+  load vagrant_defaults
+
+  defaultOSConfigure(vm)
+
+  scripts_location = Dir.exists?("./scripts") ? "./scripts" : "../scripts" 
+  vm.provision "IPv6 Setup", type: "shell", path: scripts_location + "/ipv6.sh", args: [node_ip4, node_ip6, node_ip6_gw, CNI, vm.box]
+
+  install_type = getInstallType(vm, RELEASE_VERSION, GITHUB_BRANCH)
+  vm.provision "Ping Check", type: "shell", inline: "ping -4 -c 2 rke2.io"
+
+  if roles.include?("server")
+    vm.provision :rke2, run: 'once' do |rke2|
+      rke2.env = %W[INSTALL_RKE2_TYPE=server #{install_type}]
+      rke2.config_mode = '0644' # side-step https://github.com/k3s-io/k3s/issues/4321
+      rke2.config = <<~YAML
+        write-kubeconfig-mode: '0644'
+        node-external-ip: #{node_ip4},#{node_ip6}
+        node-ip: #{node_ip4},#{node_ip6}
+        token: vagrant-rke2
+        cluster-cidr: 10.42.0.0/16,2001:cafe:42:0::/56
+        service-cidr: 10.43.0.0/16,2001:cafe:43:0::/112
+        bind-address: #{NETWORK4_PREFIX}.100
+        cni: #{CNI}
+        kubelet-arg: "--node-ip=0.0.0.0" # Workaround for https://github.com/kubernetes/kubernetes/issues/111695
+      YAML
+    end
+  end
+  if roles.include?("agent")
+    vm.provision :rke2, run: 'once' do |rke2|
+      rke2.env = %W[INSTALL_RKE2_TYPE=agent #{install_type}]
+      rke2.config_mode = '0644' # side-step https://github.com/k3s-io/k3s/issues/4321
+      rke2.install_path = false
+      rke2.config = <<~YAML
+        write-kubeconfig-mode: '0644'
+        node-external-ip: #{node_ip4},#{node_ip6}
+        node-ip: #{node_ip4},#{node_ip6}
+        server: https://#{NETWORK4_PREFIX}.100:9345
+        token: vagrant-rke2
+        cni: #{CNI}
+        kubelet-arg: "--node-ip=0.0.0.0" # Workaround for https://github.com/kubernetes/kubernetes/issues/111695
+      YAML
+    end
+  end
+end
+
+Vagrant.configure("2") do |config|
+  config.vagrant.plugins = ["vagrant-rke2", "vagrant-reload", "vagrant-libvirt"]
+  config.vm.provider "libvirt" do |v|
+    v.cpus = NODE_CPUS
+    v.memory = NODE_MEMORY
+  end
+
+  if NODE_ROLES.kind_of?(String)
+    NODE_ROLES = NODE_ROLES.split(" ", -1)
+  end
+  if NODE_BOXES.kind_of?(String)
+    NODE_BOXES = NODE_BOXES.split(" ", -1)
+  end
+
+  # Must iterate on the index, vagrant does not understand iterating 
+  # over the node roles themselves
+  NODE_ROLES.length.times do |i|
+    name = NODE_ROLES[i]
+    config.vm.define name do |node|
+      roles = name.split("-", -1)
+      role_num = roles.pop.to_i
+      provision(node.vm, roles, role_num, i)
+    end
+  end
+end

tests/e2e/dnscache/dnscache_test.go

@@ -0,0 +1,121 @@
+package dnscache
+
+import (
+	"flag"
+	"fmt"
+
+	"os"
+	"strings"
+	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/rancher/rke2/tests/e2e"
+)
+
+// Valid nodeOS: generic/ubuntu2004, opensuse/Leap-15.3.x86_64
+var nodeOS = flag.String("nodeOS", "generic/ubuntu2004", "VM operating system")
+var serverCount = flag.Int("serverCount", 1, "number of server nodes")
+var agentCount = flag.Int("agentCount", 1, "number of agent nodes")
+var ci = flag.Bool("ci", false, "running on CI")
+
+// Environment Variables Info:
+// E2E_RELEASE_VERSION=v1.23.1+rke2r1 or nil for latest commit from release-1.26
+
+func Test_E2Ednscache(t *testing.T) {
+	flag.Parse()
+	RegisterFailHandler(Fail)
+	suiteConfig, reporterConfig := GinkgoConfiguration()
+	RunSpecs(t, "Validate dnscache Test Suite", suiteConfig, reporterConfig)
+}
+
+var (
+	kubeConfigFile  string
+	serverNodeNames []string
+	agentNodeNames  []string
+)
+var _ = ReportAfterEach(e2e.GenReport)
+
+var _ = Describe("Verify dnscache Configuration", Ordered, func() {
+
+	It("Starts up with no issues", func() {
+		var err error
+		serverNodeNames, agentNodeNames, err = e2e.CreateCluster(*nodeOS, *serverCount, *agentCount)
+		Expect(err).NotTo(HaveOccurred(), e2e.GetVagrantLog(err))
+		fmt.Println("CLUSTER CONFIG")
+		fmt.Println("OS:", *nodeOS)
+		fmt.Println("Server Nodes:", serverNodeNames)
+		fmt.Println("Agent Nodes:", agentNodeNames)
+		kubeConfigFile, err = e2e.GenKubeConfigFile(serverNodeNames[0])
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	It("Checks Node Status", func() {
+		Eventually(func(g Gomega) {
+			nodes, err := e2e.ParseNodes(kubeConfigFile, false)
+			g.Expect(err).NotTo(HaveOccurred())
+			for _, node := range nodes {
+				g.Expect(node.Status).Should(Equal("Ready"))
+			}
+		}, "620s", "5s").Should(Succeed())
+		_, err := e2e.ParseNodes(kubeConfigFile, true)
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	It("Checks Pod Status", func() {
+		Eventually(func(g Gomega) {
+			pods, err := e2e.ParsePods(kubeConfigFile, false)
+			g.Expect(err).NotTo(HaveOccurred())
+			for _, pod := range pods {
+				if strings.Contains(pod.Name, "helm-install") {
+					g.Expect(pod.Status).Should(Equal("Completed"), pod.Name)
+				} else {
+					g.Expect(pod.Status).Should(Equal("Running"), pod.Name)
+				}
+			}
+		}, "420s", "5s").Should(Succeed())
+		_, err := e2e.ParsePods(kubeConfigFile, true)
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	It("Verifies that each node has IPv4 and IPv6", func() {
+		for _, node := range serverNodeNames {
+			cmd := fmt.Sprintf("kubectl get node %s -o jsonpath='{.status.addresses}' --kubeconfig=%s | jq '.[] | select(.type == \"ExternalIP\") | .address'",
+				node, kubeConfigFile)
+			res, err := e2e.RunCommand(cmd)
+			Expect(err).NotTo(HaveOccurred(), res)
+			Expect(res).Should(ContainSubstring("10.10.10"))
+			Expect(res).Should(ContainSubstring("fd11:decf:c0ff"))
+		}
+	})
+
+	It("Verifies nodecache daemonset comes up", func() {
+		_, err := e2e.DeployWorkload("nodecache.yaml", kubeConfigFile)
+		Expect(err).NotTo(HaveOccurred())
+		Eventually(func() (string, error) {
+			cmd := "kubectl get ds node-local-dns -n kube-system -o jsonpath='{.status.numberReady}' --kubeconfig=" + kubeConfigFile
+			return e2e.RunCommand(cmd)
+		}, "120s", "5s").Should(ContainSubstring("2"))
+	})
+
+	It("Verifies nodecache is working", func() {
+		cmd := "dig +retries=0 @169.254.20.10 www.kubernetes.io"
+		for _, nodeName := range serverNodeNames {
+			Expect(e2e.RunCmdOnNode(cmd, nodeName)).Should(ContainSubstring("status: NOERROR"), "failed cmd: "+cmd)
+		}
+	})
+})
+
+var failed bool
+var _ = AfterEach(func() {
+	failed = failed || CurrentSpecReport().Failed()
+})
+
+var _ = AfterSuite(func() {
+	if failed && !*ci {
+		fmt.Println("FAILED!")
+	} else {
+		Expect(e2e.DestroyCluster()).To(Succeed())
+		Expect(os.Remove(kubeConfigFile)).To(Succeed())
+	}
+})

tests/e2e/resource_files/nodecache.yaml

@@ -0,0 +1,10 @@
+---
+apiVersion: helm.cattle.io/v1
+kind: HelmChartConfig
+metadata:
+  name: rke2-coredns
+  namespace: kube-system
+spec:
+  valuesContent: |-
+    nodelocal:
+      enabled: true