kubectl apply -f https://app.getambassador.io/yaml/emissary/3.2.0/emissary-crds.yaml

resource "helm_release" "emissary_crds" {
     name             = "emissary-crds"
     create_namespace = true # create emissary default namespace `emissary-system`
     namespace        = local.emissary_ns
     chart            = "../common/helm/repos/emissary-crds-8.2.0.tgz"
}

# Install Emissary-ingress from Chart Repository
resource "helm_release" "emissary_ingress" {
  name             = "emissary-ingress"
  repository       = "https://app.getambassador.io"
  chart            = "emissary-ingress"
  version          = local.chart_version
  create_namespace = true
  namespace        = local.emissary_ns

  values = [
    templatefile("${local.common_yaml_d}/emissary-ingress-template.yaml", local.emissary_ingress_map)
  ]

  depends_on = [
    helm_release.emissary_crds
  ]
}

最后一部分，也是自制 chart 专门负责config

# This is for install Host/Listener/Mapping/TLSContext from a local custom chart
# also can upload chart to a bucket or a public github for install from a url
# e.g. [Publish to a GCS bucket](https://github.com/hayorov/helm-gcs)
resource "helm_release" "emissary_config" {
  name      = "emissary-config"
  namespace = local.emissary_ns
  chart     = "../common/helm/repos/emissary-config-8.2.0.tgz"

  values = [
    templatefile("${local.common_yaml_d}/emissary-listeners-template.yaml", local.emissary_listeners_map),
    local.emissary_config_yaml
  ]

  depends_on = [
    helm_release.emissary_ingress
  ]
}

locals 变量

locals {

  project_id     = "global-sre-dev"
  cluster_name   = "sre-gke"
  cluster_region = "us-central1"
  emissary_ns    = "emissary"
  chart_version  = "8.2.0"
  common_yaml_d  = "../common/helm/yamls"
  ambassador_id  = "ambassador"

  emissary_ingress_map = {
    ambassadorID          = local.ambassador_id
    loadBalancerIP        = "35.232.98.249" # Prepare a Static IP first instead to use Ephemeral
    replicaCount          = 2
    minReplicas           = 2
    maxReplicas           = 3
    canaryEnabled         = false # set to true in Prod
    logLevel              = "error" # valid log levels are error, warn/warning, info, debug, and trace
    endpointEnable        = true
    endpointName          = "my-resolver"
    diagnosticsEnable     = false
    clusterRequestTimeout = 120000 # milliseconds
  }

  emissary_listeners_map = {
    ambassadorID          = local.ambassador_id
    listenersEnabled      = true # custom listeners
  }
}

locals.tf

config文件

locals {
  emissary_config_yaml = <<-EOT
    hosts:
    - name: my-host-dev
      spec:
        ambassador_id:
        - ${local.ambassador_id}
        hostname: '*.wadexu.cloud'
        requestPolicy:
          insecure:
            action: Redirect
        tlsContext:
          name: my-tls-context
        tlsSecret:
          name: tls-secret
          namespace: secret
    mappings:
    - name: my-nginx-mapping
      spec:
        ambassador_id:
        - ${local.ambassador_id}
        hostname: dev.wadexu.cloud
        prefix: /
        service: my-nginx.nginx:80

    tlscontexts:
    - name: my-tls-context
      spec:
        ambassador_id:
        - ${local.ambassador_id}
        hosts:
        - "*.wadexu.cloud"
        min_tls_version: v1.2
  EOT
}

config.tf

完整代码请参考 my repo

kubectl create secret -n secret tls tls-secret \
  --key ./xxx.key \
  --cert ./xxx.pem

Install from local， (Optional) 如果要学习自动化Terraform安装，请参考【部署Terrform基础设施代码的自动化利器 Atlantis】

cd terraform_helm_install/dev

terraform init
terraform plan
terraform apply

Install result

% helm list -n emissary-system
NAME         	NAMESPACE      	REVISION	UPDATED                            	STATUS  	CHART              	APP VERSION
emissary-crds	emissary-system	1       	2022-10-20 10:09:30.72553 +0800 CST	deployed	emissary-crds-8.2.0	3.2.0         

% helm list -n emissary
NAME            	NAMESPACE	REVISION	UPDATED                             	STATUS  	CHART                 	APP VERSION
emissary-config 	emissary 	1       	2022-10-20 10:31:24.819555 +0800 CST	deployed	emissary-config-8.2.0 	3.2.0
emissary-ingress	emissary 	1       	2022-10-20 10:29:33.705888 +0800 CST	deployed	emissary-ingress-8.2.0	3.2.0   

在一个集群里安装多个 Emissary 一定要设置 ambassador_id 并且替换 ClusterRoleBinding name， 否则资源冲突。

# apply CRDs first
kustomize build emissary-ingress-init/sre-mgmt-dev > ~/init.yaml
kubectl apply -f ~/init.yaml

# deploy first public Emissary, this allow list = all, face to internet
kustomize build emissary-ingress-public/sre-mgmt-dev > ~/emissary_deploy1.yaml
kubectl apply -f ~/emissary_deploy1.yaml

# deploy second private Emissary with a restrict allow list to access
kustomize build emissary-ingress-private/sre-mgmt-dev > ~/emissary_deploy2.yaml
kubectl apply -f ~/emissary_deploy2.yaml

module "example_custom_manifests" {
  source  = "kbst.xyz/catalog/custom-manifests/kustomization"
  version = "0.3.0"

  configuration_base_key = "default"
  configuration = {
    default = {

      resources = [
        "${path.root}/../../infra/emissary-ingress-init/sre-mgmt-dev"
      ]

      common_labels = {
        "env" = "dev"
      }
    }
  }
}

helm install my-nginx bitnami/nginx --set service.type="ClusterIP" -n nginx --create-namespace

% curl https://dev.wadexu.cloud
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>