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Config Template

What is Config Template?

There are many scenarios to need users to provide structured data which is a config. Config Template could define the schema and the structure of the config data. KubeVela could base the Config Template help users to create a valid config.

The config data save as a Secret default, but you also could generate resources of any type by defining the template. Even, you can define the extend writer to write the config data to the Nacos server.

Config Template Specification

Config Template defined with the CUE file. The schema of the specification:


metadata: {
name: string
alias?: string
description?: string
scope: "project" | "system"
sensitive: bool
}

template: {
parameter: {...}
output?: #Secret
outputs?: {#AnyResources}
nacos?: {
// The endpoint can not references the parameter.
endpoint: {
// Users must create a config base the nacos-server template firstly.
name: string
}
format: "json" | "yaml" | "properties" | "toml"
// could references the parameter
metadata: {
dataId: string
group: string
appName: string
namespaceId: string
tenant: string
tag: string
}
content: {...}
}
}

Metadata

  • metadata.name This is required. Specify the name of the template.
  • metadata.alias Specify the alias of the template.
  • metadata.description Specify the description of the template.
  • metadata.scope Specify the scope of the config created by this template. In VelaUX, the template belonging to the project scope means this template could be used to create the config in the project. If created in the system, this config could be shared with all projects.
  • metadata.sensitive Is it sensitive the config created by this template? If the config is sensitive, it can not be read directly and could only mount the Secret.

Template

  • template.parameter Specify the parameters of the config. KubeVela will generate the schema by this definition and validate the user's input.

  • template.output This is not required. You could specify if you want to customize the data structure of the Secret.

  • template.outputs This is not required. You could specify any resources that you want to generate by this config.

  • template.nacos This is not required. You could specify the Nacos config metadata if you want to write the config data to the Nacos server. template.nacos.name This is the name of the config created by the built-in template nacos-server.

Config Template Management

  • List the Config Templates
vela config-template list
  • Create a Config Template
vela config-template apply -f example.cue
  • Show the schema and document of the Config Template
vela config-template show <Template Name>
  • Delete a Config Template
vela config-template delete <Template Name>

More usages, refer to:

vela config-template --help

Examples

Image Registry

import (
"encoding/base64"
"encoding/json"
"strconv"
)

metadata: {
name: "image-registry"
alias: "Image Registry"
scope: "project"
description: "Config information to authenticate image registry"
sensitive: false
}

template: {
output: {
apiVersion: "v1"
kind: "Secret"
metadata: {
name: context.name
namespace: context.namespace
labels: {
"config.oam.dev/catalog": "velacore-config"
"config.oam.dev/type": "image-registry"
}
}
if parameter.auth != _|_ {
type: "kubernetes.io/dockerconfigjson"
}
if parameter.auth == _|_ {
type: "Opaque"
}
stringData: {
if parameter.auth != _|_ && parameter.auth.username != _|_ {
".dockerconfigjson": json.Marshal({
"auths": (parameter.registry): {
"username": parameter.auth.username
"password": parameter.auth.password
if parameter.auth.email != _|_ {
"email": parameter.auth.email
}
"auth": base64.Encode(null, (parameter.auth.username + ":" + parameter.auth.password))
}
})
}
if parameter.insecure != _|_ {
"insecure-skip-verify": strconv.FormatBool(parameter.insecure)
}
if parameter.useHTTP != _|_ {
"protocol-use-http": strconv.FormatBool(parameter.useHTTP)
}
}
}

parameter: {
// +usage=Image registry FQDN, such as: index.docker.io
registry: *"index.docker.io" | string
// +usage=Authenticate the image registry
auth?: {
// +usage=Private Image registry username
username: string
// +usage=Private Image registry password
password: string
// +usage=Private Image registry email
email?: string
}
// +usage=For the registry server that uses the self-signed certificate
insecure?: bool
// +usage=For the registry server that uses the HTTP protocol
useHTTP?: bool
}
}

Nacos Server

metadata: {
name: "nacos-server"
alias: "Nacos Server"
description: "Config the Nacos server connectors"
sensitive: false
scope: "system"
}

template: {
parameter: {
// +usage=Directly configure the Nacos server address
servers?: [...{
// +usage=the nacos server address
ipAddr: string
// +usage=nacos server port
port: *8849 | int
// +usage=nacos server grpc port, default=server port + 1000, this is not required
grpcPort?: int
}]
// +usage=Discover the Nacos servers by the client.
client?: {
// +usage=the endpoint for get Nacos server addresses
endpoint: string
// +usage=the AccessKey for kms
accessKey?: string
// +usage=the SecretKey for kms
secretKey?: string
// +usage=the regionId for kms
regionId?: string
// +usage=the username for nacos auth
username?: string
// +usage=the password for nacos auth
password?: string
// +usage=it's to open kms,default is false. https://help.aliyun.com/product/28933.html
openKMS?: bool
}
}
}

Generic Nacos Config

metadata: {
name: "nacos-config"
alias: "Nacos Configuration"
description: "Write the configuration to the nacos"
sensitive: false
scope: "system"
}

template: {
nacos: {
// The endpoint can not references the parameter.
endpoint: {
// Users must create a config base the nacos-server template firstly.
name: "nacos"
}
format: parameter.contentType

// could references the parameter
metadata: {
dataId: parameter.dataId
group: parameter.group
if parameter.appName != _|_ {
appName: parameter.appName
}
if parameter.namespaceId != _|_ {
namespaceId: parameter.namespaceId
}
if parameter.tenant != _|_ {
tenant: parameter.tenant
}
if parameter.tag != _|_ {
tag: parameter.tag
}
}
content: parameter.content
}
parameter: {
// +usage=Configuration ID
dataId: string
// +usage=Configuration group
group: *"DEFAULT_GROUP" | string
// +usage=The configuration content.
content: {
...
}
contentType: *"json" | "yaml" | "properties" | "toml"
// +usage=The app name of the configuration
appName?: string
// +usage=The namespaceId of the configuration
namespaceId?: string
// +usage=The tenant, corresponding to the namespace ID field of Nacos
tenant?: string
// +usage=The tag of the configuration
tag?: string
}
}

Alibaba Cloud Provider

import "strings"

metadata: {
name: "terraform-alibaba"
alias: "Terraform Provider for Alibaba Cloud"
sensitive: true
scope: "system"
description: "Terraform Provider for Alibaba Cloud"
}

template: {
outputs: {
"provider": {
apiVersion: "terraform.core.oam.dev/v1beta1"
kind: "Provider"
metadata: {
name: parameter.name
namespace: "default"
labels: l
}
spec: {
provider: "alibaba"
region: parameter.ALICLOUD_REGION
credentials: {
source: "Secret"
secretRef: {
namespace: "vela-system"
name: context.name
key: "credentials"
}
}
}
}
}

output: {
apiVersion: "v1"
kind: "Secret"
metadata: {
name: context.name
namespace: context.namespace
}
type: "Opaque"
stringData: credentials: strings.Join([creds1, creds2], "\n")
}

creds1: "accessKeyID: " + parameter.ALICLOUD_ACCESS_KEY
creds2: "accessKeySecret: " + parameter.ALICLOUD_SECRET_KEY

l: {
"config.oam.dev/catalog": "velacore-config"
"config.oam.dev/type": "terraform-provider"
"config.oam.dev/provider": "terraform-alibaba"
}

parameter: {
//+usage=The name of Terraform Provider for Alibaba Cloud, default is `default`
name: *"default" | string
//+usage=Get ALICLOUD_ACCESS_KEY per this guide https://help.aliyun.com/knowledge_detail/38738.html
ALICLOUD_ACCESS_KEY: string
//+usage=Get ALICLOUD_SECRET_KEY per this guide https://help.aliyun.com/knowledge_detail/38738.html
ALICLOUD_SECRET_KEY: string
//+usage=Get ALICLOUD_REGION by picking one RegionId from Alibaba Cloud region list https://www.alibabacloud.com/help/doc-detail/72379.htm
ALICLOUD_REGION: string
}
}

Share the Template

The Config Template is part of the Addon. You could get or share the templates via addons.