(#53) Add Vault as an optional service on the core clusters

This patch migrates the vault component from [holos-infra][1] to a cue
based component.  Vault is optional in the reference platform, so this
patch also defines an `#OptionalServices` struct to conditionally manage
a service across multiple clusters in the platform.

The primary use case for optional services is managing a namespace to
provision and provide secrets across clusters.

[1]: https://github.com/holos-run/holos-infra/tree/v0.5.0/components/core/core/vault

docs/examples/optionalservices.cue

@@ -0,0 +1,39 @@
+package holos
+
+// Controls optional feature flags for services distributed across multiple holos components.
+// For example, enable issuing certificates in the provisioner cluster when an optional service is
+// enabled for a workload cluster.
+
+#OptionalService: {
+	name:    string
+	enabled: true | *false
+	clusters: [Name=_]: #Platform.clusters[Name]
+	clusterNames: [for k, v in clusters {k}]
+	namespaces: [Name=_]: #ManagedNamespace & {
+		name: Name
+	}
+	// servers represents istio Gateway.spec.servers.hosts entries
+	// Refer to istio/gateway/gateway.cue
+	servers: [Name=_]: {
+		hosts: [...string]
+		port: name:          Name
+		port: number:        443
+		port: protocol:      "HTTPS"
+		tls: credentialName: string
+		tls: mode:           "SIMPLE"
+	}
+	// public tls certs should align to hosts.
+	certs: [Name=_]: #Certificate & {
+		metadata: name: Name
+	}
+}
+
+#OptionalServices: {
+	[Name=_]: #OptionalService & {
+		name: Name
+	}
+}
+
+for k, v in #OptionalServices {
+	#ManagedNamespaces: v.namespaces
+}

docs/examples/platforms/optional.site.cue

@@ -0,0 +1,54 @@
+package holos
+
+let CoreDomain = "core.\(#Platform.org.domain)"
+let TargetNamespace = "prod-core-vault"
+
+#OptionalServices: {
+	vault: {
+		enabled: true
+		clusters: core1: _
+		clusters: core2: _
+		namespaces: "prod-core-vault": labels: "istio-injection": "enabled"
+		certs: "vault-core": #Certificate & {
+			metadata: name:      "vault-core"
+			metadata: namespace: "istio-ingress"
+			spec: {
+				commonName: "vault.\(CoreDomain)"
+				dnsNames: [commonName]
+				secretName: metadata.name
+				issuerRef: kind: "ClusterIssuer"
+				issuerRef: name: string | *"letsencrypt"
+			}
+		}
+		servers: "https-vault-core": {
+			hosts: ["\(TargetNamespace)/vault.\(CoreDomain)"]
+			tls: credentialName: certs."vault-core".spec.secretName
+		}
+		for k, v in clusters {
+			let obj = (Cert & {Name: "vault-core", Cluster: v.name}).APIObject
+			certs: "\(obj.metadata.name)": obj
+			servers: "https-\(obj.metadata.name)": {
+				hosts: [for host in obj.spec.dnsNames {"\(TargetNamespace)/\(host)"}]
+				tls: credentialName: obj.spec.secretName
+			}
+		}
+	}
+}
+
+// Cert provisions a cluster specific certificate.
+let Cert = {
+	Name:    string
+	Cluster: string
+
+	APIObject: #Certificate & {
+		metadata: name:      "\(Cluster)-\(Name)"
+		metadata: namespace: string | *"istio-ingress"
+		spec: {
+			commonName: string | *"vault.\(Cluster).\(CoreDomain)"
+			dnsNames: [commonName]
+			secretName: metadata.name
+			issuerRef: kind: "ClusterIssuer"
+			issuerRef: name: string | *"letsencrypt"
+		}
+	}
+}

docs/examples/platforms/reference/clusters/accounts/iam/zitadel/zitadel/zitadel.cue

@@ -10,7 +10,8 @@ let Name = "zitadel"
 #Kustomization: spec: targetNamespace: #TargetNamespace
 
 #HelmChart & {
-	namespace: #TargetNamespace
+	namespace:   #TargetNamespace
+	enableHooks: true
 	chart: {
 		name:    Name
 		version: "7.9.0"

docs/examples/platforms/reference/clusters/foundation/cloud/init/namespaces/component.cue

@@ -7,26 +7,16 @@ package holos
 	component: "namespaces"
 }
 
-// #PlatformNamespaceObjects defines the api objects necessary for eso SecretStores in external clusters to access secrets in a given namespace in the provisioner cluster.
-#PlatformNamespaceObjects: {
-	_ns: #PlatformNamespace
-
-	objects: [
-		#Namespace & {
-			metadata: _ns
-		},
-	]
-}
-
 #KubernetesObjects & {
 	apiObjects: {
+		// #ManagedNamespaces is the set of all namespaces across all clusters in the platform.
+		for k, ns in #ManagedNamespaces {
+			Namespace: "\(ns.name)": #Namespace & {metadata: ns}
+		}
+
+		// #PlatformNamespaces is deprecated in favor of #ManagedNamespaces.
 		for ns in #PlatformNamespaces {
-			for obj in (#PlatformNamespaceObjects & {_ns: ns}).objects {
-				let Kind = obj.kind
-				let NS = ns.name
-				let Name = obj.metadata.name
-				"\(Kind)": "\(NS)/\(Name)": obj
-			}
+			Namespace: "\(ns.name)": #Namespace & {metadata: ns}
 		}
 	}
 }

docs/examples/platforms/reference/clusters/foundation/cloud/mesh/istio/gateway/gateway.cue

@@ -1,7 +1,8 @@
 package holos
 
-// The primary istio Gateway, named default
+import "list"
 
+// The primary istio Gateway, named default
 let Name = "gateway"
 
 #InputKeys: component: Name
@@ -31,5 +32,21 @@ let LoginCert = #PlatformCerts.login
 				},
 			]
 		}
+
+		for k, svc in #OptionalServices {
+			if svc.enabled {
+				if list.Contains(svc.clusterNames, #ClusterName) {
+					Gateway: "\(svc.name)": #Gateway & {
+						metadata: name:      svc.name
+						metadata: namespace: #TargetNamespace
+						spec: selector: istio: "ingressgateway"
+						spec: servers: [for s in svc.servers {s}]
+					}
+					for k, s in svc.servers {
+						ExternalSecret: "\(s.tls.credentialName)": _
+					}
+				}
+			}
+		}
 	}
 }

docs/examples/platforms/reference/clusters/foundation/cloud/secrets/secretstores/secretstores.cue

@@ -30,5 +30,10 @@ package holos
 				"\(Kind)": "\(NS)/\(Name)": obj
 			}
 		}
+
+		for k, ns in #ManagedNamespaces {
+			let obj = #SecretStore & {_namespace: ns.name}
+			SecretStore: "\(ns.name)/\(obj.metadata.name)": obj
+		}
 	}
 }

docs/examples/platforms/reference/clusters/optional/vault/values.holos.cue

@@ -0,0 +1,146 @@
+package holos
+
+#Values: {
+
+	// Vault Helm Chart Holos Values
+	global: {
+		enabled: true
+		// Istio handles this
+		tlsDisable: true
+	}
+
+	injector: enabled: false
+
+	server: {
+		image: {
+			// repository: "hashicorp/vault"
+			repository: "quay.io/holos/hashicorp/vault"
+			tag:        "1.14.10"
+			// Overrides the default Image Pull Policy
+			pullPolicy: "IfNotPresent"
+		}
+
+		extraLabels: "sidecar.istio.io/inject": "true"
+
+		resources: requests: {
+			memory: "256Mi"
+			cpu:    "2000m"
+		}
+		// limits:
+		//   memory: 1024Mi
+		//   cpu: 2000m
+		// For HA configuration and because we need to manually init the vault,
+		// we need to define custom readiness/liveness Probe settings
+		readinessProbe: {
+			enabled: true
+			path:    "/v1/sys/health?standbyok=true&sealedcode=204&uninitcode=204"
+		}
+		livenessProbe: {
+			enabled:             true
+			path:                "/v1/sys/health?standbyok=true"
+			initialDelaySeconds: 60
+		}
+
+		// extraEnvironmentVars is a list of extra environment variables to set with
+		// the stateful set. These could be used to include variables required for
+		// auto-unseal.
+		// Vault validates an incomplete chain:
+		// https://github.com/hashicorp/vault/issues/11318
+		extraEnvironmentVars: {
+			GOMAXPROCS: "2"
+		} // Set to cpu limit, see https://github.com/uber-go/automaxprocs
+		// extraVolumes is a list of extra volumes to mount. These will be exposed
+		// to Vault in the path `/vault/userconfig/<name>/`.
+		extraVolumes: [{
+			type: "secret"
+			name: "gcpkms-creds"
+		}]
+
+		// This configures the Vault Statefulset to create a PVC for audit logs.
+		// See https://www.vaultproject.io/docs/audit/index.html to know more
+		auditStorage: {
+			enabled:   true
+			mountPath: "/var/log/vault"
+		} // for compatibility with plain debian vm location.
+
+		standalone: {
+			enabled: false
+		}
+
+		ha: {
+			enabled:  true
+			replicas: 3
+			raft: {
+				enabled:   true
+				setNodeId: true
+
+				config: """
+					ui = true
+					listener \"tcp\" {
+					  address = \"[::]:8200\"
+					  cluster_address = \"[::]:8201\"
+					  # mTLS is handled by the the istio sidecar
+					  tls_disable = \"true\"
+					  # Enable unauthenticated metrics access (necessary for Prometheus Operator)
+					  telemetry {
+					    unauthenticated_metrics_access = true
+					  }
+					}
+
+					telemetry {
+					  prometheus_retention_time = \"30s\"
+					  disable_hostname = true
+					}
+
+					seal \"gcpckms\" {
+					  credentials = \"/vault/userconfig/gcpkms-creds/credentials.json\"
+					  project     = \"v6-vault-f15f\"
+					  region      = \"us-west1\"
+					  key_ring    = \"vault-core\"
+					  crypto_key  = \"vault-core-unseal\"
+					}
+
+					# Note; the retry_join leader_api_address values come from the Stable
+					# Network ID feature of a Statefulset.  See:
+					# https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#stable-network-id
+					storage \"raft\" {
+					  path = \"/vault/data\"
+					  retry_join {
+					    leader_api_addr = \"http://vault-0.vault-internal:8200\"
+					    leader_tls_servername = \"vault\"
+					  }
+					  retry_join {
+					    leader_api_addr = \"http://vault-1.vault-internal:8200\"
+					    leader_tls_servername = \"vault\"
+					  }
+					  retry_join {
+					    leader_api_addr = \"http://vault-2.vault-internal:8200\"
+					    leader_tls_servername = \"vault\"
+					  }
+
+					  autopilot {
+					    cleanup_dead_servers = \"true\"
+					    last_contact_threshold = \"200ms\"
+					    last_contact_failure_threshold = \"10m\"
+					    max_trailing_logs = 250000
+					    min_quorum = 3
+					    server_stabilization_time = \"10s\"
+					  }
+
+					}
+
+					service_registration \"kubernetes\" {}
+
+					"""
+
+				// Vault UI (Will be exposed via the service mesh)
+			} // Vault UI (Will be exposed via the service mesh)
+		} // Vault UI (Will be exposed via the service mesh)
+	} // Vault UI (Will be exposed via the service mesh)// Vault UI (Will be exposed via the service mesh)
+	ui: {
+		enabled:         true
+		serviceType:     "ClusterIP"
+		serviceNodePort: null
+		externalPort:    8200
+	}
+}

docs/examples/platforms/reference/clusters/optional/vault/vault.cue

@@ -0,0 +1,77 @@
+package holos
+
+import "encoding/yaml"
+
+import "list"
+
+let Name = "vault"
+#InputKeys: component: Name
+#InputKeys: project:   "core"
+#TargetNamespace: "\(#InstancePrefix)-\(Name)"
+
+let Vault = #OptionalServices[Name]
+
+if Vault.enabled {
+	if list.Contains(Vault.clusterNames, #ClusterName) {
+		#HelmChart & {
+			namespace: #TargetNamespace
+			chart: {
+				name:    Name
+				version: "0.25.0"
+				repository: {
+					name: "hashicorp"
+					url:  "https://helm.releases.hashicorp.com"
+				}
+			}
+			values: #Values
+
+			apiObjects: {
+				ExternalSecret: "gcpkms-creds":      _
+				ExternalSecret: "vault-server-cert": _
+				VirtualService: "\(Name)": {
+					metadata: name:      Name
+					metadata: namespace: #TargetNamespace
+					spec: hosts: [for cert in Vault.certs {cert.spec.commonName}]
+					spec: gateways: ["istio-ingress/\(Name)"]
+					spec: http: [
+						{
+							route: [
+								{
+									destination: host: "\(Name)-active"
+									destination: port: number: 8200
+								},
+							]
+						},
+					]
+				}
+			}
+		}
+
+		#Kustomize: {
+			patches: [
+				{
+					target: {
+						group:   "apps"
+						version: "v1"
+						kind:    "StatefulSet"
+						name:    Name
+					}
+					patch: yaml.Marshal(EnvPatch)
+				},
+			]
+		}
+
+		let EnvPatch = [
+			{
+				op:    "test"
+				path:  "/spec/template/spec/containers/0/env/4/name"
+				value: "VAULT_ADDR"
+			},
+			{
+				op:    "replace"
+				path:  "/spec/template/spec/containers/0/env/4/value"
+				value: "http://$(VAULT_K8S_POD_NAME):8200"
+			},
+		]
+	}
+}

docs/examples/platforms/reference/clusters/provisioner/mesh/certificates/optional/vault.cue

@@ -0,0 +1,13 @@
+package holos
+
+let Vault = #OptionalServices.vault
+
+if Vault.enabled {
+	#KubernetesObjects & {
+		apiObjects: {
+			for k, obj in Vault.certs {
+				"\(obj.kind)": "\(obj.metadata.name)": obj
+			}
+		}
+	}
+}

docs/examples/platforms/reference/clusters/provisioner/secrets/eso-creds-refresher/component.cue

@@ -24,6 +24,14 @@ ksObjects: []
 				"\(Kind)": "\(ns.name)/\(Name)": obj
 			}
 		}
+
+		for k, ns in #ManagedNamespaces {
+			for obj in (#PlatformNamespaceObjects & {_ns: ns}).objects {
+				let Kind = obj.kind
+				let Name = obj.metadata.name
+				"\(Kind)": "\(ns.name)/\(Name)": obj
+			}
+		}
 	}
 }
 

docs/examples/platforms/reference/clusters/provisioner/secrets/namespaces/component.cue

@@ -7,25 +7,16 @@ package holos
 	component: "namespaces"
 }
 
-// #PlatformNamespaceObjects defines the api objects necessary for eso SecretStores in external clusters to access secrets in a given namespace in the provisioner cluster.
-#PlatformNamespaceObjects: {
-	_ns: #PlatformNamespace
-
-	objects: [
-		#Namespace & {
-			metadata: name: _ns.name
-		},
-	]
-}
-
 #KubernetesObjects & {
 	apiObjects: {
+		// #ManagedNamespaces is the set of all namespaces across all clusters in the platform.
+		for k, ns in #ManagedNamespaces {
+			Namespace: "\(ns.name)": #Namespace & {metadata: ns}
+		}
+
+		// #PlatformNamespaces is deprecated in favor of #ManagedNamespaces.
 		for ns in #PlatformNamespaces {
-			for obj in (#PlatformNamespaceObjects & {_ns: ns}).objects {
-				let Kind = obj.kind
-				let Name = obj.metadata.name
-				"\(Kind)": "\(Name)": obj
-			}
+			Namespace: "\(ns.name)": #Namespace & {metadata: ns}
 		}
 	}
 }

docs/examples/platforms/reference/namespaces.cue

@@ -12,7 +12,7 @@ let Privileged = {
 
 // #PlatformNamespaces is the union of all namespaces across all cluster types.  Namespaces are created in all clusters regardless of if they're
 // used within the cluster or not.  The is important for security and consistency with IAM, RBAC, and Secrets sync between clusters.
-// Holos adopts the namespace sameness position of SIG Multicluster, refer to https://github.com/kubernetes/community/blob/dd4c8b704ef1c9c3bfd928c6fa9234276d61ad18/sig-multicluster/namespace-sameness-position-statement.md
+// TODO: Deprecate in favor of #ManagedNamespaces because it better to add fields to an object instead adding items to a list.
 #PlatformNamespaces: [
 	{name: "external-secrets"},
 	{name: "holos-system"},

docs/examples/schema.cue

@@ -285,6 +285,21 @@ _apiVersion: "holos.run/v1alpha1"
 	}
 }
 
+// ManagedNamespace is a namespace to manage across all clusters in the holos platform.
+#ManagedNamespace: {
+	// TODO metadata labels and annotations
+	name: string
+	labels: [string]: string
+}
+
+// #ManagedNamepsaces is the union of all namespaces across all cluster types and optional services.
+// Holos adopts the namespace sameness position of SIG Multicluster, refer to https://github.com/kubernetes/community/blob/dd4c8b704ef1c9c3bfd928c6fa9234276d61ad18/sig-multicluster/namespace-sameness-position-statement.md
+#ManagedNamespaces: {
+	[Name=_]: {
+		name: Name
+	}
+}
+
 // #Backups defines backup configuration.
 // TODO: Consider the best place for this, possibly as part of the site platform config.  This represents the primary location for backups.
 #Backups: {
@@ -393,6 +408,8 @@ _apiVersion: "holos.run/v1alpha1"
 	resourcesFile: ResourcesFile
 	// kustomizeFiles represents the files in a kustomize directory tree.
 	kustomizeFiles: #KustomizeFiles.Files
+	// enableHooks removes the --no-hooks flag from helm template
+	enableHooks: true | *false
 }
 
 // #KustomizeBuild is a holos component that uses plain yaml files as the source of api objects for a holos component.

pkg/internal/builder/builder.go

@@ -121,6 +121,7 @@ type HelmChart struct {
 	Namespace     string   `json:"namespace"`
 	Chart         Chart    `json:"chart"`
 	ValuesContent string   `json:"valuesContent"`
+	EnableHooks   bool     `json:"enableHooks"`
 	// APIObjectMap holds the marshalled representation of api objects.
 	APIObjectMap apiObjectMap `json:"APIObjectMap"`
 }
@@ -445,7 +446,12 @@ func runHelm(ctx context.Context, hc *HelmChart, r *Result, path holos.PathCompo
 
 	// Run charts
 	chart := hc.Chart
-	helmOut, err := util.RunCmd(ctx, "helm", "template", "--include-crds", "--values", valuesPath, "--namespace", hc.Namespace, "--kubeconfig", "/dev/null", "--version", chart.Version, chart.Release, cachedChartPath)
+	args := []string{"template"}
+	if !hc.EnableHooks {
+		args = append(args, "--no-hooks")
+	}
+	args = append(args, "--include-crds", "--values", valuesPath, "--namespace", hc.Namespace, "--kubeconfig", "/dev/null", "--version", chart.Version, chart.Release, cachedChartPath)
+	helmOut, err := util.RunCmd(ctx, "helm", args...)
 	if err != nil {
 		stderr := helmOut.Stderr.String()
 		lines := strings.Split(stderr, "\n")

pkg/version/embedded/minor

@@ -1 +1 @@
-56
+57