FluxCD

This addon is built based FluxCD

install

vela addon enable fluxcd

Definitions

The following definitions will be enabled after the installation of fluxcd addon.

DEFINITION NAME	DEFINITION TYPE	DEFINITION DESCRIPTION
helm	ComponentDefinition	helps to deploy a helm chart from git repo, helm repo or S3 compatible bucket
kustomize	ComponentDefinition	helps to deploy a kustomize style artifact and GitOps capability to watch changes from git repo or image registry
kustomize-json-patch	TraitDefinition	A list of JSON6902 patch to selected target
kustomize-patch	TraitDefinition	A list of StrategicMerge or JSON6902 patch to selected target
kustomize-strategy-merge	TraitDefinition	A list of strategic merge to kustomize config

helm

Parameters

Parameters	Description	Example
repoType	required, indicates the type of repository, should be "helm","git", "oss", or "oci".	Helm
pullInterval	optional, the interval at which to check for repository/bucket and release updates, default to 5m	5m
url	required, the Git or Helm repository URL, OSS endpoint, accept HTTP/S or SSH address as git url	https://charts.bitnami.com/bitnami
secretRef	optional, the name of the Secret object that holds the credentials required to pull the repo. The username and password fields must be included in the HTTP/S basic authentication Secret. For TLS the secret must contain a certFile and keyFile, and/or caCert fields. For TLS authentication, the secret must contain a certFile / keyFile field and/or caCert field.	sec-name
timeout	optional, the timeout for operations like download index/clone repository	60s
chart	required, the relative path to helm chart for git/oss source. The chart name for helm resource	redis-cluster
version	optional, chart version, * by default	6.2.7
targetNamespace	optional, the namespace to install chart, decided by chart itself	your-ns
releaseName	optional, release name after installed	your-rn
values	optional, override the Values.yaml inchart, using for the rendering of Helm
installTimeout	optional, the timeout for operation helm install, and 10 minutes by default	20m
interval	optional, the Interval at which to reconcile the Helm release, default to 30s	1m
oss	optional, The oss source configuration
git	optional, The git source configuration	dev

OSS

Parameters	Description	Example
bucketName	required, bucket name	your-bucket
provider	optional, Generic or aws, if you get the certificate from aws EC2, fill in aws. The default is generic.	generic
region	optional, bucket region

Git

Parameters	Description	Example
branch	optional, Git branch, master by default	your-branch

Example

You can create an application like below to deploy a helm chart which stored in helm repository.

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: helm-redis
spec:
  components:
    - name: redis
      type: helm
      properties:
        repoType: "helm"
        url: "https://charts.bitnami.com/bitnami"
        chart: "redis"
        version: "16.8.5"
        values: 
          master:
            persistence:
              size: 16Gi
          replica:
            persistence:
              size: 16Gi

If your helm chart is stored in OCI registry, you can create the application like this:

Note: Please guarantee your fluxcd addon version >= v1.3.1

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: oci-app
  namespace: default
spec:
  components:
    - name: test-oci
      type: helm
      properties:
        repoType: "oci"
        url: oci://ghcr.io/stefanprodan/charts
        chart: podinfo
        version: '6.1.*'

If your helm chart is stored in OSS, you can create the application like this:

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: bucket-app
spec:
  components:
    - name: bucket-comp
      type: helm
      properties:
        repoType: oss
        # required if bucket is private
        secretRef: bucket-secret
        chart: ./chart/podinfo-5.1.3.tgz
        url: oss-cn-beijing.aliyuncs.com
        oss:
            bucketName: definition-registry

If your helm chart stored in git, you can create the application like this:

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
   name: app-delivering-chart
spec:
   components:
     - name: terraform-controller
       type: helm
       properties:
          repoType: git
          url: https://github.com/oam-dev/terraform-controller
          chart: ./chart
          git:
            branch: master

kustomize

Parameters

Parameters	Description	Example
repoType	required, indicates the type of repository, should be "helm","git" or "oss".	oss
pullInterval	optional, Synchronize with Git repository, and the time interval between tuning helm release. The default value is 5m (5 minutes）	10m
url	required, bucket's endpoint, no need to fill in with scheme	oss-cn-beijing.aliyuncs.com
secretRef	optional, Save the name of a Secret, which is the credential to read the bucket. Secret contains accesskey and secretkey fields	sec-name
timeout	optional, The timeout period of the download operation, the default is 20s	60s
path	required, The directory containing the kustomization.yaml file, or the directory containing a set of YAML files (used to generate kustomization.yaml)	./prod
oss	optional, The oss source configuration
git	optional, The git source configuration
imageRepository	optional, The image [repository](#Image Repository) for automatically update image to git

Image Repository

Parameter	Required	Description	Example
image	required	The image url	oamdev/vela-core
secretRef	optional	If it's a private image registry, use kubectl create secret docker-registry to create the secret	my-secret
policy	optional	[Policy](#Image policy) gives the particulars of the policy to be followed in selecting the most recent image.
filterTags	optional	FilterTags enables filtering for only a subset of tags based on a set of rules. If no rules are provided, all the tags from the repository will be ordered and compared.	$timestamp
commitMessage	optional	Use for more commit message

Image policy

Parameter	Required	Description	Example
alphabetical.order	optional	Order specifies the sorting order of the tags. Given the letters of the alphabet as tags, ascending order would select Z, and descending order would select A	asc
numerical.order	optional	Given the integer values from 0 to 9 as tags, ascending order would select 9, and descending order would select 0	asc
semver.range	optional	Range gives a semver range for the image tag; the highest version within the range that's a tag yields the latest image	'>=1.0.0 <2.0.0'

FilterTags

Parameter	Required	Description	Example
extract	optional	Extract allows a capture group to be extracted from the specified regular expression pattern, useful before tag evaluation	$timestamp
pattern	optional	Pattern specifies a regular expression pattern used to filter for image tags	'^master-[a-f0-9]'

Example

1. If your kustomize style artifact is stored in oss, you can create application by flowing these steps:

(Optional)If your OSS bucket needs identity verification, create a Secret first:

$ kubectl create secret generic bucket-secret --from-literal=accesskey=<your-ak> --from-literal=secretkey=<your-sk>
secret/bucket-secret created

Deploy this application:

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: bucket-app
spec:
  components:
    - name: bucket-comp
      type: kustomize
      properties:
        repoType: oss
        # If the bucket is private, you will need to provide
        secretRef: bucket-secret
        url: oss-cn-beijing.aliyuncs.com
        oss:
          bucketName: definition-registry
        path: ./app/prod/

2. If your artifact is stored in git, you can create application like this:

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: git-app
spec:
  components:
    - name: git-comp
      type: kustomize
      properties:
        repoType: git
        url: https://github.com/<path>/<to>/<repo>
        git:
          branch: master
          provider: GitHub
        path: ./app/dev/

3. If you want to create a application which updated automatically when image updated. You can create the application like this.

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: image-app
spec:
  components:
    - name: image
      type: kustomize
      properties:
        imageRepository:
          image: <your image>
          secretRef: imagesecret
          filterTags:
            pattern: '^master-[a-f0-9]+-(?P<ts>[0-9]+)'
            extract: '$ts'
          policy:
            numerical:
              order: asc
          commitMessage: "Image: {{range .Updated.Images}}{{println .}}{{end}}"

Note

In this addon, there are five controllers to be installed by default

• Source controller

  • The source-controller is a Kubernetes operator, specialised in artifacts acquisition from external sources such as Git, Helm repositories and S3 buckets. The source-controller implements the source.toolkit.fluxcd.io API and is a core component of the GitOps toolkit.
  • 

• Image (metadata) reflector controller

  • This is a controller that reflects container image metadata into a Kubernetes cluster. It pairs with the image update automation controller to drive automated config updates.

• Image automation controller

  • This controller automates updates to YAML when new container images are available.
  • Its sibling, image-reflector-controller, scans container image repositories and reflects the metadata in Kubernetes resources. This controller reacts to that image metadata by updating YAML files in a git repository, and committing the changes.

• kustomize-controller

  • The kustomize-controller is a Kubernetes operator, specialized in running continuous delivery pipelines for infrastructure and workloads defined with Kubernetes manifests and assembled with Kustomize.
  • 

• helm-controller

  • The helm-controller is a Kubernetes operator, allowing one to declaratively manage Helm chart releases. It is part of a composable GitOps toolkit and depends on source-controller to acquire the Helm charts from Helm repositories.
  • The desired state of a Helm release is described through a Kubernetes Custom Resource named HelmRelease. Based on the creation, mutation or removal of a HelmRelease resource in the cluster, Helm actions are performed by the operator.
  •