init: copied modules from lawndale-infra

kubernetes/flannel/configmap.tf

@@ -0,0 +1,39 @@
+resource "kubernetes_config_map" "this" {
+  metadata {
+    namespace = var.namespace
+    name      = "kube-flannel-cfg"
+    labels = {
+      app       = "flannel"
+      "k8s-app" = "cni"
+    }
+  }
+  data = {
+    "cni-conf.json" = jsonencode({
+      name       = "cbr0",
+      cniVersion = "0.3.1",
+      plugins = [
+        {
+          type = "flannel",
+          delegate = {
+            hairpinMode      = true,
+            isDefaultGateway = true,
+          }
+        },
+        {
+          type = "portmap",
+          capabilities = {
+            portMappings = true,
+          }
+        },
+      ]
+    })
+    "net-conf.json" = jsonencode({
+      Network = var.cluster_cidr,
+      Backend = {
+        Type = "vxlan",
+        VNI  = var.vxlan_id,
+        Port = var.vxlan_port,
+      }
+    })
+  }
+}

kubernetes/flannel/daemonset.tf

@@ -0,0 +1,167 @@
+resource "kubernetes_daemonset" "this" {
+  metadata {
+    name      = var.daemonset_name
+    namespace = var.namespace
+    labels = {
+      app       = var.daemonset_name
+      "k8s-app" = "cni"
+    }
+  }
+  spec {
+    selector {
+      match_labels = {
+        app       = var.daemonset_name
+        "k8s-app" = "cni"
+      }
+    }
+
+    template {
+      metadata {
+        labels = {
+          app       = var.daemonset_name
+          "k8s-app" = "cni"
+        }
+      }
+      spec {
+        affinity {
+          node_affinity {
+            required_during_scheduling_ignored_during_execution {
+              node_selector_term {
+                match_expressions {
+                  key      = "kubernetes.io/os"
+                  operator = "In"
+                  values   = var.node_selector_os
+                }
+              }
+            }
+          }
+        }
+
+        host_network        = true
+        priority_class_name = "system-node-critical"
+
+        toleration {
+          operator = "Exists"
+          effect   = "NoSchedule"
+        }
+
+        service_account_name = kubernetes_service_account.this.metadata.0.name
+
+        init_container {
+          name    = "install-cni-plugin"
+          image   = var.flannel_cni_plugin_image
+          command = ["cp"]
+          args    = ["-f", "/flannel", "/opt/cni/bin/flannel"]
+          volume_mount {
+            name       = "cni-plugin"
+            mount_path = "/opt/cni/bin"
+          }
+        }
+
+        init_container {
+          name    = "install-cni"
+          image   = var.flannel_image
+          command = ["cp"]
+          args    = ["-f", "/etc/kube-flannel/cni-conf.json", "/etc/cni/net.d/10-flannel.conflist"]
+          volume_mount {
+            name       = "cni"
+            mount_path = "/etc/cni/net.d"
+          }
+          volume_mount {
+            name       = "flannel-cfg"
+            mount_path = "/etc/kube-flannel/"
+          }
+        }
+
+        container {
+          name    = "kube-flannel"
+          image   = var.flannel_image
+          command = ["/opt/bin/flanneld"]
+          args    = ["--ip-masq", "--kube-subnet-mgr"]
+          resources {
+            requests = {
+              cpu    = "100m"
+              memory = "50Mi"
+            }
+            limits = {
+              cpu    = "100m"
+              memory = "50Mi"
+            }
+          }
+          security_context {
+            privileged = false
+            capabilities {
+              add = ["NET_ADMIN", "NET_RAW"]
+            }
+          }
+
+          env {
+            name = "POD_NAME"
+            value_from {
+              field_ref {
+                field_path = "metadata.name"
+              }
+            }
+          }
+
+          env {
+            name = "POD_NAMESPACE"
+            value_from {
+              field_ref {
+                field_path = "metadata.namespace"
+              }
+            }
+          }
+          env {
+            name  = "EVENT_QUEUE_DEPTH"
+            value = "5000"
+          }
+          volume_mount {
+            name       = "run"
+            mount_path = "/run/flannel"
+          }
+          volume_mount {
+            name       = "flannel-cfg"
+            mount_path = "/etc/kube-flannel/"
+          }
+          volume_mount {
+            name       = "xtables-lock"
+            mount_path = "/run/xtables.lock"
+          }
+        }
+
+        volume {
+          name = "run"
+          host_path {
+            path = "/run/flannel"
+          }
+        }
+        volume {
+          name = "cni-plugin"
+          host_path {
+            path = "/opt/cni/bin"
+          }
+        }
+        volume {
+          name = "cni"
+          host_path {
+            path = "/etc/cni/net.d"
+          }
+        }
+        volume {
+          name = "flannel-cfg"
+          config_map {
+            name = kubernetes_config_map.this.metadata.0.name
+          }
+        }
+        volume {
+          name = "xtables-lock"
+          host_path {
+            path = "/run/xtables.lock"
+            type = "FileOrCreate"
+          }
+        }
+      }
+    }
+  }
+}

kubernetes/flannel/outputs.tf

@@ -0,0 +1,23 @@
+output "service_account" {
+  value = kubernetes_service_account.this
+}
+
+output "cluster_role" {
+  value = kubernetes_cluster_role.this
+}
+
+output "cluster_role_binding" {
+  value = kubernetes_cluster_role_binding.this
+}
+
+output "pod_security_policy" {
+  value = kubernetes_pod_security_policy.this
+}
+
+output "daemonset" {
+  value = kubernetes_daemonset.this
+}
+
+output "configmap" {
+  value = kubernetes_config_map.this
+}

kubernetes/flannel/pod_security.tf

@@ -0,0 +1,65 @@
+resource "kubernetes_pod_security_policy" "this" {
+  metadata {
+    name = "psp.flannel.unprivileged"
+    annotations = {
+      "seccomp.security.alpha.kubernetes.io/allowedProfileNames" : "docker/default",
+      "seccomp.security.alpha.kubernetes.io/defaultProfileName" : "docker/default",
+      "apparmor.security.beta.kubernetes.io/allowedProfileNames" : "runtime/default",
+      "apparmor.security.beta.kubernetes.io/defaultProfileName" : "runtime/default",
+    }
+  }
+  spec {
+    # Privilege Escalation
+    allow_privilege_escalation         = false
+    default_allow_privilege_escalation = false
+    privileged                         = false
+
+    volumes = [
+      "configMap",
+      "secret",
+      "emptyDir",
+      "hostPath",
+    ]
+    allowed_host_paths {
+      path_prefix = "/etc/cni/net.d"
+    }
+    allowed_host_paths {
+      path_prefix = "/etc/kube-flannel"
+    }
+    allowed_host_paths {
+      path_prefix = "/run/flannel"
+    }
+
+    read_only_root_filesystem = false
+
+    # Users and groups
+    run_as_user {
+      rule = "MustRunAsNonRoot"
+    }
+    supplemental_groups {
+      rule = "RunAsAny"
+    }
+    fs_group {
+      rule = "RunAsAny"
+    }
+
+    # Capabilities
+    allowed_capabilities       = ["NET_ADMIN", "NET_RAW"]
+    default_add_capabilities   = []
+    required_drop_capabilities = []
+
+    # Host namespaces
+    host_pid     = false
+    host_ipc     = false
+    host_network = true
+    host_ports {
+      min = 0
+      max = 65535
+    }
+    # SELinux
+    se_linux {
+      # SELinux is unused in CaaSP
+      rule = "RunAsAny"
+    }
+  }
+}

kubernetes/flannel/provider.tf

@@ -0,0 +1,8 @@
+terraform {
+  required_providers {
+    kubernetes = {
+      source  = "hashicorp/kubernetes"
+      version = "~> 2.11"
+    }
+  }
+}

kubernetes/flannel/rbac.tf

@@ -0,0 +1,52 @@
+
+resource "kubernetes_cluster_role" "this" {
+  count = var.create_cluster_role ? 1 : 0
+
+  metadata {
+    name = var.cluster_role_name
+  }
+  rule {
+    api_groups     = ["extensions"]
+    resources      = ["podsecuritypolicies"]
+    verbs          = ["use"]
+    resource_names = [kubernetes_pod_security_policy.this.metadata.0.name]
+  }
+  rule {
+    api_groups = [""]
+    resources  = ["pods"]
+    verbs      = ["get"]
+  }
+  rule {
+    api_groups = [""]
+    resources  = ["nodes"]
+    verbs      = ["list", "watch"]
+  }
+  rule {
+    api_groups = [""]
+    resources  = ["nodes/status"]
+    verbs      = ["patch"]
+  }
+}
+
+resource "kubernetes_service_account" "this" {
+  metadata {
+    name      = "flannel"
+    namespace = var.namespace
+  }
+}
+
+resource "kubernetes_cluster_role_binding" "this" {
+  metadata {
+    name = "flannel"
+  }
+  role_ref {
+    api_group = "rbac.authorization.k8s.io"
+    kind      = "ClusterRole"
+    name      = var.cluster_role_name
+  }
+  subject {
+    kind      = "ServiceAccount"
+    name      = kubernetes_service_account.this.metadata.0.name
+    namespace = kubernetes_service_account.this.metadata.0.namespace
+  }
+}

kubernetes/flannel/variables.tf

@@ -0,0 +1,52 @@
+variable "namespace" {
+  type        = string
+  description = "namespace for resources"
+  default     = "kube-system"
+}
+
+variable "vxlan_id" {
+  type        = number
+  description = "VXLAN ID (VNI)"
+}
+
+variable "vxlan_port" {
+  type        = number
+  description = "UDP port to use for sending encapsulated packets"
+}
+
+variable "flannel_image" {
+  type    = string
+  default = "rancher/mirrored-flannelcni-flannel:v0.17.0"
+}
+
+variable "flannel_cni_plugin_image" {
+  type    = string
+  default = "rancher/mirrored-flannelcni-flannel-cni-plugin:v1.0.1"
+}
+
+variable "cluster_role_name" {
+  type        = string
+  description = "Name of the cluster role flannel will use"
+  default     = "flannel"
+}
+variable "create_cluster_role" {
+  type        = bool
+  description = "Weather or not to create a suitable cluster role or use an already exisiting specified by cluster_role_name variable"
+  default     = true
+}
+
+variable "daemonset_name" {
+  type        = string
+  description = "Name of the daeomonset"
+  default     = "flannel"
+}
+variable "node_selector_os" {
+  type        = list(string)
+  description = "Which kubernetes.io/os node-label to match for execution"
+  default     = ["linux"]
+}
+
+variable "cluster_cidr" {
+  type        = string
+  description = "ClusterCIDR"
+}