From a57bd81fe541d1651376781311eb2f1fb6e5df01 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bruno=20M=2E=20Cust=C3=B3dio?= Date: Wed, 21 Sep 2022 10:32:03 +0100 Subject: [PATCH] Initial commit. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Bruno M. Custódio --- LICENSE | 201 ++++++++++++++++++++++++++++++++++++ Makefile | 7 ++ README.md | 64 ++++++++++++ locals.tf | 31 ++++++ main.tf | 25 +++++ scripts/manifests/etcd.yaml | 130 +++++++++++++++++++++++ scripts/provisioner.sh | 90 ++++++++++++++++ terraform.tf | 23 +++++ variables.tf | 76 ++++++++++++++ 9 files changed, 647 insertions(+) create mode 100644 LICENSE create mode 100644 Makefile create mode 100644 README.md create mode 100644 locals.tf create mode 100644 main.tf create mode 100644 scripts/manifests/etcd.yaml create mode 100755 scripts/provisioner.sh create mode 100644 terraform.tf create mode 100644 variables.tf diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..261eeb9 --- /dev/null +++ b/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..51a3965 --- /dev/null +++ b/Makefile @@ -0,0 +1,7 @@ +SHELL := /bin/bash +ROOT := $$(git rev-parse --show-toplevel) + +.PHONY: docs + +docs: + @terraform-docs markdown table --output-file "$(ROOT)/README.md" --output-mode inject "$(ROOT)" diff --git a/README.md b/README.md new file mode 100644 index 0000000..b3435d4 --- /dev/null +++ b/README.md @@ -0,0 +1,64 @@ +# terraform-k8s-cilium + +An opinionated Terraform module that can be used to install and manage Cilium on top of a Kubernetes cluster. + + +## Requirements + +| Name | Version | +|------|---------| +| [terraform](#requirement\_terraform) | >= 1.2.0 | +| [null](#requirement\_null) | >= 3.1.1 | + +## Providers + +| Name | Version | +|------|---------| +| [null](#provider\_null) | >= 3.1.1 | + +## Modules + +No modules. + +## Resources + +| Name | Type | +|------|------| +| [null_resource.main](https://registry.terraform.io/providers/hashicorp/null/latest/docs/resources/resource) | resource | + +## Inputs + +| Name | Description | Type | Default | Required | +|------|-------------|------|---------|:--------:| +| [cilium\_helm\_chart](#input\_cilium\_helm\_chart) | The name of the Helm chart to use to install Cilium. It is assumed that the Helm repository containing this chart has been added beforehand (e.g. using 'helm repo add'). | `string` | `"cilium/cilium"` | no | +| [cilium\_helm\_release\_name](#input\_cilium\_helm\_release\_name) | The name of the Helm release to use for Cilium. | `string` | `"cilium"` | no | +| [cilium\_helm\_values\_file\_path](#input\_cilium\_helm\_values\_file\_path) | The path to the file containing the values to use when installing Cilium. | `string` | n/a | yes | +| [cilium\_helm\_version](#input\_cilium\_helm\_version) | The version of the Cilium Helm chart to install. | `string` | n/a | yes | +| [cilium\_namespace](#input\_cilium\_namespace) | The namespace in which to install Cilium. | `string` | `"kube-system"` | no | +| [deploy\_etcd\_cluster](#input\_deploy\_etcd\_cluster) | Whether to deploy an 'etcd' cluster suitable for usage as the Cilium key-value store (HIGHLY EXPERIMENTAL). | `bool` | `false` | no | +| [extra\_provisioner\_environment\_variables](#input\_extra\_provisioner\_environment\_variables) | A map of extra environment variables to include when executing the provisioning script. | `map(string)` | `{}` | no | +| [ipsec\_key](#input\_ipsec\_key) | The IPsec key to use for transparent encryption. Leave empty for none to be created (in which case encryption should be disabled in Helm as well). | `string` | `""` | no | +| [path\_to\_kubeconfig\_file](#input\_path\_to\_kubeconfig\_file) | The path to the kubeconfig file to use. | `string` | n/a | yes | +| [post\_cilium\_install\_script](#input\_post\_cilium\_install\_script) | A script to be run right after installing Cilium. | `string` | `""` | no | +| [pre\_cilium\_install\_script](#input\_pre\_cilium\_install\_script) | A script to be run right before installing Cilium. | `string` | `""` | no | + +## Outputs + +No outputs. + + +## License + +Copyright 2022 Isovalent, Inc. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. diff --git a/locals.tf b/locals.tf new file mode 100644 index 0000000..6f189b9 --- /dev/null +++ b/locals.tf @@ -0,0 +1,31 @@ +// Copyright 2022 Isovalent, Inc. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +locals { + provisioner_environment = merge(var.extra_provisioner_environment_variables, local.provisioner_environment_variables) // The full set of environment variables passed to the provisioning script. + provisioner_environment_variables = { // The set of environment variables set by this module on the provisioning script. + CILIUM_HELM_CHART = var.cilium_helm_chart, // The Cilium Helm chart to deploy. + CILIUM_HELM_RELEASE_NAME = var.cilium_helm_release_name, // The name to use for the Cilium Helm release. + CILIUM_HELM_VALUES_FILE = var.cilium_helm_values_file_path, // The path to the Helm values file to use when installing Cilium. + CILIUM_HELM_VERSION = var.cilium_helm_version, // The version of the Cilium Helm chart to deploy. + CILIUM_NAMESPACE = var.cilium_namespace, // The namespace where to deploy Cilium. + DEPLOY_ETCD_CLUSTER = var.deploy_etcd_cluster // Whether to deploy an 'etcd' cluster suitable for usage as the Cilium key-value store. + INSTALL_KUBE_PROMETHEUS_CRDS = true, // Whether to install (some of) the 'kube-prometheus' CRDs (such as 'ServiceMonitor'). + IPSEC_KEY = var.ipsec_key, // The IPsec key to be used for transparent encryption. + KUBECONFIG = var.path_to_kubeconfig_file // The path to the kubeconfig file that will be created and output. + PRE_CILIUM_INSTALL_SCRIPT = var.pre_cilium_install_script != "" ? base64encode(var.pre_cilium_install_script) : "" // The script to execute before installing Cilium. + POST_CILIUM_INSTALL_SCRIPT = var.post_cilium_install_script != "" ? base64encode(var.post_cilium_install_script) : "" // The script to execute after installing Cilium. + } + provisioner_path = "${abspath(path.module)}/scripts/provisioner.sh" +} diff --git a/main.tf b/main.tf new file mode 100644 index 0000000..b571617 --- /dev/null +++ b/main.tf @@ -0,0 +1,25 @@ +// Copyright 2022 Isovalent, Inc. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// The resource used to run the provisioning script. +resource "null_resource" "main" { + triggers = merge(local.provisioner_environment, { + CILIUM_HELM_VALUES_FILE_SHA1 = sha1(file(var.cilium_helm_values_file_path)) // Use the contents of the Cilium (base) Helm values file as a trigger. + PROVISIONER_SHA1 = sha1(file(local.provisioner_path)), // Use the contents of the provisioning script as a trigger. + }) + provisioner "local-exec" { + command = local.provisioner_path // The path to the provisioning script. + environment = local.provisioner_environment // The set of environment variables used when running the provisioning script. + } +} diff --git a/scripts/manifests/etcd.yaml b/scripts/manifests/etcd.yaml new file mode 100644 index 0000000..358dcd3 --- /dev/null +++ b/scripts/manifests/etcd.yaml @@ -0,0 +1,130 @@ +# NOTE: The manifests below and the resulting etcd cluster are meant for testing purposes only. +--- +apiVersion: v1 +kind: Service +metadata: + labels: + app.kubernetes.io/name: cilium-etcd + name: cilium-etcd-client + namespace: "${CILIUM_NAMESPACE}" +spec: + ports: + - name: etcd-client + port: 2379 + protocol: TCP + targetPort: 2379 + selector: + # Do not change the labels below. They must map exactly to + # https://github.com/cilium/cilium/blob/v1.12.2/pkg/identity/numericidentity.go#L207-L348 + app: etcd + io.cilium/app: etcd-operator + etcd_cluster: cilium-etcd + type: LoadBalancer +--- +apiVersion: v1 +kind: Service +metadata: + labels: + app.kubernetes.io/name: cilium-etcd + name: cilium-etcd + namespace: "${CILIUM_NAMESPACE}" +spec: + clusterIP: None + ports: + - port: 2379 + name: client + - port: 2380 + name: peer + publishNotReadyAddresses: true + selector: + # Do not change the labels below. They must map exactly to + # https://github.com/cilium/cilium/blob/v1.12.2/pkg/identity/numericidentity.go#L207-L348 + app: etcd + io.cilium/app: etcd-operator + etcd_cluster: cilium-etcd +--- +apiVersion: apps/v1 +kind: StatefulSet +metadata: + labels: + app.kubernetes.io/name: cilium-etcd + name: cilium-etcd + namespace: "${CILIUM_NAMESPACE}" +spec: + podManagementPolicy: Parallel + selector: + matchLabels: + # Do not change the labels below. They must map exactly to + # https://github.com/cilium/cilium/blob/v1.12.2/pkg/identity/numericidentity.go#L207-L348 + app: etcd + io.cilium/app: etcd-operator + etcd_cluster: cilium-etcd + serviceName: cilium-etcd + replicas: 3 + template: + metadata: + name: cilium-etcd + labels: + # Do not change the labels below. They must map exactly to + # https://github.com/cilium/cilium/blob/v1.12.2/pkg/identity/numericidentity.go#L207-L348 + app: etcd + io.cilium/app: etcd-operator + etcd_cluster: cilium-etcd + spec: + containers: + - name: etcd + image: quay.io/coreos/etcd:v3.5.4 + command: + - etcd + - --data-dir=/var/run/etcd/default.etcd + - --name=$(POD_NAME) + - --initial-advertise-peer-urls=http://$(POD_IP):2380 + - --listen-peer-urls=http://0.0.0.0:2380 + - --listen-client-urls=http://0.0.0.0:2379 + - --advertise-client-urls=http://$(POD_IP).cilium-etcd:2379 + - --initial-cluster-token=cilium-etcd + - --initial-cluster=$(PEERS) + - --initial-cluster-state=new + env: + - name: PEERS + value: cilium-etcd-0=http://cilium-etcd-0.cilium-etcd:2380,cilium-etcd-1=http://cilium-etcd-1.cilium-etcd:2380,cilium-etcd-2=http://cilium-etcd-2.cilium-etcd:2380 + - name: POD_NAME + valueFrom: + fieldRef: + fieldPath: metadata.name + - name: POD_IP + valueFrom: + fieldRef: + fieldPath: status.podIP + ports: + - containerPort: 2379 + name: client + - containerPort: 2380 + name: peer + livenessProbe: + exec: + command: + - etcdctl + - endpoint + - status + - --endpoints=http://localhost:2379 + failureThreshold: 3 + initialDelaySeconds: 10 + periodSeconds: 60 + successThreshold: 1 + timeoutSeconds: 10 + readinessProbe: + exec: + command: + - etcdctl + - endpoint + - status + - --endpoints=http://localhost:2379 + failureThreshold: 3 + initialDelaySeconds: 1 + periodSeconds: 5 + successThreshold: 1 + timeoutSeconds: 5 + volumes: + - name: data + emptyDir: {} diff --git a/scripts/provisioner.sh b/scripts/provisioner.sh new file mode 100755 index 0000000..a582ccc --- /dev/null +++ b/scripts/provisioner.sh @@ -0,0 +1,90 @@ +#!/bin/bash + +# Copyright 2022 Isovalent, Inc. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +set -euxo pipefail + +ROOT="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )" + +# Wait for the KUBECONFIG file to be created. +COUNT=1 +until [[ -f "${KUBECONFIG}" ]]; +do + if [[ ${COUNT} -gt 1800 ]]; + then + echo "Failed to find KUBECONFIG." + exit 1 + else + COUNT=$((COUNT+1)) + sleep 1 + fi +done + +# Create the target namespace if it does not exist. +if ! kubectl get ns "${CILIUM_NAMESPACE}"; +then + kubectl create ns "${CILIUM_NAMESPACE}" +fi + +# Upsert or delete the IPsec secret to be used for transparent encryption. +IPSEC_ENABLED="" +IPSEC_SECRET_NAME="cilium-ipsec-keys" +if [[ "${IPSEC_KEY}" != "" ]]; +then + IPSEC_ENABLED="true" + kubectl -n "${CILIUM_NAMESPACE}" create secret generic "${IPSEC_SECRET_NAME}" --from-literal=keys="${IPSEC_KEY}" --dry-run=client -o yaml | kubectl apply -f- +else + IPSEC_ENABLED="false" + kubectl -n "${CILIUM_NAMESPACE}" delete secret "${IPSEC_SECRET_NAME}" --ignore-not-found +fi +export IPSEC_ENABLED + +# Manually create the 'ServiceMonitor' CRD from 'kube-prometheus' so we can enable the creation of 'ServiceMonitor' resources in the Cilium Helm chart. +if [[ "${INSTALL_KUBE_PROMETHEUS_CRDS}" == "true" ]]; +then + kubectl apply -f "https://raw.githubusercontent.com/prometheus-operator/kube-prometheus/release-0.11/manifests/setup/0servicemonitorCustomResourceDefinition.yaml" + until kubectl get servicemonitors --all-namespaces; + do + echo "Waiting for the 'servicemonitors' CRD..."; + sleep 1; + done +fi + +# Deploy an 'etcd' cluster suitable for usage as the Cilium key-value store. +# This will be deployed to the same namespace as Cilium itself. +if [[ "${DEPLOY_ETCD_CLUSTER}" == "true" ]]; +then + envsubst < "${ROOT}/manifests/etcd.yaml" | kubectl apply -f- +fi + +# Run any pre-install script we may have been provided with. +if [[ "${PRE_CILIUM_INSTALL_SCRIPT}" != "" ]]; +then + base64 --decode <<< "${PRE_CILIUM_INSTALL_SCRIPT}" | bash +fi + +# Get the latest information about charts from the respective chart repositories. +helm repo update + +# Replace variables in the values file and pipe it to 'helm upgrade --install'. +envsubst < "${CILIUM_HELM_VALUES_FILE}" | \ + helm upgrade --install "${CILIUM_HELM_RELEASE_NAME}" "${CILIUM_HELM_CHART}" \ + --version "${CILIUM_HELM_VERSION}" -n "${CILIUM_NAMESPACE}" -f /dev/stdin + +# Run any post-install script we may have been provided with. +if [[ "${POST_CILIUM_INSTALL_SCRIPT}" != "" ]]; +then + base64 --decode <<< "${POST_CILIUM_INSTALL_SCRIPT}" | bash +fi diff --git a/terraform.tf b/terraform.tf new file mode 100644 index 0000000..740e838 --- /dev/null +++ b/terraform.tf @@ -0,0 +1,23 @@ +// Copyright 2022 Isovalent, Inc. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +terraform { + required_providers { + null = { + source = "hashicorp/null" + version = ">= 3.1.1" + } + } + required_version = ">= 1.2.0" +} diff --git a/variables.tf b/variables.tf new file mode 100644 index 0000000..03d7ff6 --- /dev/null +++ b/variables.tf @@ -0,0 +1,76 @@ +// Copyright 2022 Isovalent, Inc. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +variable "cilium_helm_chart" { + default = "cilium/cilium" + description = "The name of the Helm chart to use to install Cilium. It is assumed that the Helm repository containing this chart has been added beforehand (e.g. using 'helm repo add')." + type = string +} + +variable "cilium_helm_release_name" { + default = "cilium" + description = "The name of the Helm release to use for Cilium." + type = string +} + +variable "cilium_helm_values_file_path" { + description = "The path to the file containing the values to use when installing Cilium." + type = string +} + +variable "cilium_helm_version" { + description = "The version of the Cilium Helm chart to install." + type = string +} + +variable "cilium_namespace" { + default = "kube-system" + description = "The namespace in which to install Cilium." + type = string +} + +variable "deploy_etcd_cluster" { + default = false + description = "Whether to deploy an 'etcd' cluster suitable for usage as the Cilium key-value store (HIGHLY EXPERIMENTAL)." + type = bool +} + +variable "extra_provisioner_environment_variables" { + default = {} + description = "A map of extra environment variables to include when executing the provisioning script." + type = map(string) +} + +variable "ipsec_key" { + default = "" + description = "The IPsec key to use for transparent encryption. Leave empty for none to be created (in which case encryption should be disabled in Helm as well)." + type = string +} + +variable "path_to_kubeconfig_file" { + description = "The path to the kubeconfig file to use." + type = string +} + +variable "pre_cilium_install_script" { + default = "" + description = "A script to be run right before installing Cilium." + type = string +} + +variable "post_cilium_install_script" { + default = "" + description = "A script to be run right after installing Cilium." + type = string +}