Argo CD ApplicationSet

Argo CD ApplicationSet

ApplicationSet 介绍

ApplicationSet 控制器是一个 Kubernetes 控制器,添加了对 ApplicationSet CustomResourceDefinition (CRD) 的支持。该控制器实现了跨大量集群和 monorepos 内管理 Argo CD 应用程序的自动化和更大的灵活性,此外,它还使多租户 Kubernetes 集群上的自助服务使用成为可能。

ApplicationSet 控制器与现有的 Argo CD 安装一起工作。Argo CD 是一种声明式 GitOps 持续交付工具,允许开发人员从现有的 Git 工作流程中定义和控制 Kubernetes 应用程序资源的部署。

ApplicationSet 控制器通过添加支持以集群管理员为中心的场景的附加功能来补充 Argo CD。控制器 ApplicationSet 提供:

  • 能够使用单个 Kubernetes 清单通过 Argo CD 定位多个 Kubernetes 集群
  • 能够使用单个 Kubernetes 清单通过 Argo CD 从一个或多个 Git 存储库部署多个应用程序
  • 改进了对 monorepos 的支持:在 Argo CD 的上下文中,monorepo 是在单个 Git 存储库中定义的多个 Argo CD 应用程序资源
  • 在多租户集群内,提高单个集群租户使用 Argo CD 部署应用程序的能力(无需特权集群管理员参与启用目标集群/命名空间)

ApplicationSet 安装

Argo CD v2.3 开始,ApplicationSet 控制器与 Argo CD 捆绑在一起,查看 ApplicationSet

[root@node argocd]# kubectl -n argocd get pods | grep applicationset
argocd-applicationset-controller-57bbb6bcdf-zzh6p   1/1     Running   0          7d23h

[root@node argocd]# kubectl api-resources  | grep ApplicationSet
applicationsets                   appset,appsets     argoproj.io/v1alpha1                   true         ApplicationSet

如果 Argo CD 版本低于 v2.3 则需要安装服务

官方文档:https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Getting-Started/#installation

$ kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/applicationset/v0.4.0/manifests/install.yaml

ApplicationSet 使用

Generators 生成器:https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Generators/

List Generator

官方文档:https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Generators-List/

列表生成器根据任意 key/value 键值对生成参数(只要值是字符串)

配置文件:https://gitee.com/evescn/argocd-example-apps/blob/main/applicationsets/generators/demo-list.yaml

## demo-list.yaml
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: demo1-application-set
  namespace: argocd
spec:
  generators:
  - list:
      elements:
      - namespace: dev
      - namespace: test
      - namespace: stg
      - namespace: prod
  template:      
    metadata:
      name: '{{namespace}}-app'
    spec:
      project: default
      source:
        path: guestbook
        repoURL: https://gitee.com/evescn/argocd-example-apps.git
        targetRevision: main
      destination:
        server: https://kubernetes.default.svc
        namespace: '{{namespace}}'   # 动态值
      syncPolicy:
        syncOptions:
          - CreateNamespace=true  
        # automated: 
        #   prune: true

在此示例中,列表生成器将 namespace 字段作为参数传递到模板中。

创建服务

[root@node argocd]# kubectl apply -f demo-list.yaml
applicationset.argoproj.io/demo1-application-set created

查看 Web UI 界面,自动创建了 4 个服务,

img

点击 Sync 同步按钮

img

查看 K8S 集群信息

[root@node argocd]# kubectl get ns
NAME                    STATUS   AGE
dev                     Active   6d5h
prod                    Active   15s
stg                     Active   12s
test                    Active   10s

[root@node argocd]# kubectl get pods -n dev
NAME                           READY   STATUS    RESTARTS   AGE
guestbook-ui-56f57db4f-txbjv   1/1     Running   0          20s
[root@node argocd]# kubectl get pods -n test
NAME                           READY   STATUS    RESTARTS   AGE
guestbook-ui-56f57db4f-gzxds   1/1     Running   0          22s
[root@node argocd]# kubectl get pods -n stg
NAME                           READY   STATUS    RESTARTS   AGE
guestbook-ui-56f57db4f-55tc8   1/1     Running   0          25s
[root@node argocd]# kubectl get pods -n prod
NAME                           READY   STATUS    RESTARTS   AGE
guestbook-ui-56f57db4f-8jrzn   1/1     Running   0          28s

Cluster Generator

官方文档:https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Generators-Cluster/

Argo CD 中,托管集群存储在 Argo CD 命名空间中的 Secrets 中。ApplicationSet 控制器使用这些相同的 Secret 来生成参数来识别和定位可用集群。

对于使用 Argo CD 注册的每个集群,集群生成器会根据集群 secret 信息找到的项目列表生成参数。

它会自动向每个集群的应用程序模板提供以下参数值:

  • name
  • nameNormalized (“名称”,但标准化为仅包含小写字母数字字符、“-”或“.”)
  • server
  • metadata.labels. (对于 Secret 中的每个标签)
  • metadata.annotations. (对于 Secret 中的每个注释)

配置文件:https://gitee.com/evescn/argocd-example-apps/blob/main/applicationsets/generators/demo-cluster.yaml

## demo-cluster.yaml
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: multi-cluster-application-set
  namespace: argocd
spec:
  generators:
  - clusters: {} #all clusters
    #   selector:
    #     matchLabels:
    #       test: "true"
    #   values:
    #     name: "test"
  template:      
    metadata:
      name: '{{name}}-app'  ## name == clusterName (cluster1, cluster2)
    spec:
      project: default
      source:
        path: guestbook
        repoURL: https://gitee.com/evescn/argocd-example-apps.git
        targetRevision: main
      destination:
        server: '{{server}}'   # cluster URL 
        namespace: '{{name}}-demoapp'
      # Sync policy
      syncPolicy:
        syncOptions:
          - CreateNamespace=true  
        # automated: # automated sync by default retries failed attempts 5 times with following delays between attempts ( 5s, 10s, 20s, 40s, 80s ); retry controlled using `retry` field.
        #  prune: true # Specifies if resources should be pruned during auto-syncing ( false by default ).
        #  selfHeal: true # Specifies if partial app sync should be executed when resources are changed only in target Kubernetes cluster and no git change detected ( false by default ).

测试 Cluster Generator 需要多集群支持,需要向 Argo CD 中添加集群

[root@node argocd]# kubectl config get-contexts -o name
context-cluster1

[root@node ~]# argocd cluster add context-cluster1
WARNING: This will create a service account `argocd-manager` on the cluster referenced by context `context-dev` with full cluster level privileges. Do you want to continue [y/N]? y
INFO[0001] ServiceAccount "argocd-manager" already exists in namespace "kube-system" 
INFO[0001] ClusterRole "argocd-manager-role" updated    
INFO[0001] ClusterRoleBinding "argocd-manager-role-binding" updated 
Cluster 'https://192.168.0.101:6443' added

img

创建服务

[root@node argocd]# kubectl apply -f demo-cluster.yaml
applicationset.argoproj.io/multi-cluster-application-set configured

查看 Web UI 界面,自动创建了 2 个服务,当前存在 2 个集群(虽然这 2 个集群是同一个集群)

img

点击 Sync 同步按钮

img

查看 K8S 集群信息

[root@node argocd]# kubectl get ns
NAME                       STATUS   AGE
context-cluster1-demoapp   Active   49s
in-cluster-demoapp         Active   46s

[root@node argocd]# kubectl get pods -n context-cluster1-demoapp
NAME                           READY   STATUS    RESTARTS   AGE
guestbook-ui-56f57db4f-dsdgb   1/1     Running   0          64s

[root@node argocd]# kubectl get pods -n in-cluster-demoapp
NAME                           READY   STATUS    RESTARTS   AGE
guestbook-ui-56f57db4f-9jpw2   1/1     Running   0          69s

Git Generator

官方文档:https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Generators-Git/

Git 生成器包含两个子类型:Git 目录生成器和 Git 文件生成器

配置文件:https://gitee.com/evescn/argocd-example-apps/blob/main/applicationsets/generators/demo-git.yaml

## demo-git.yaml
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: many-apps-application-set
  namespace: argocd
spec:
  generators:
  - git:
      repoURL: https://gitee.com/evescn/argocd-example-apps.git
      revision: HEAD
      directories:
      - path: applicationsets/demoapps/*
  template:      
    metadata:
      name: '{{path.basename}}'   ## 目录名称(demo1,demo2,demo3)
    spec:
      project: default
      source:
        repoURL: https://gitee.com/evescn/argocd-example-apps.git
        targetRevision: main
        path: '{{path}}'     ## 完整的路径  applicationsets/demoapps/demo1
      destination:
        server: https://kubernetes.default.svc
        namespace: '{{path.basename}}'    ## 目录名称
      # Sync policy
      syncPolicy:
        syncOptions:
          - CreateNamespace=true  
        # automated:
        #  prune: true 

在此示例中,GIT 生成器将 path 字段作为参数传递到模板中。

创建服务

[root@node argocd]# kubectl apply -f demo-git.yaml
applicationset.argoproj.io/many-apps-application-set created

查看 Web UI 界面,自动创建了 3 个服务,因为 applicationsets/demoapps/* 目录下定义了 3APP

img

点击 Sync 同步按钮

img

查看 K8S 集群信息

[root@node argocd]# kubectl get ns
NAME                       STATUS   AGE
demo1                      Active   3m14s
demo2                      Active   3m10s
demo3                      Active   3m8s

[root@node argocd]# kubectl get pods -n demo1
NAME                                  READY   STATUS    RESTARTS   AGE
demo1-guestbook-ui-6cd8c8f8f7-c5d6g   1/1     Running   0          3m20s
demo1-guestbook-ui-6cd8c8f8f7-z6fw7   1/1     Running   0          3m20s

[root@node argocd]# kubectl get pods -n demo2
NAME                                  READY   STATUS    RESTARTS   AGE
demo2-guestbook-ui-85799f7689-hr2wq   1/1     Running   0          3m17s
demo2-guestbook-ui-85799f7689-qk2xg   1/1     Running   0          3m17s

[root@node argocd]# kubectl get pods -n demo3
NAME                                  READY   STATUS    RESTARTS   AGE
demo3-guestbook-ui-597fdf4f49-ktfh2   1/1     Running   0          3m16s
demo3-guestbook-ui-597fdf4f49-tgxm9   1/1     Running   0          3m16s

Matrix Generator

官方文档:https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Generators-Matrix/

Matrix 生成器组合了两个子生成器生成的参数,迭代每个生成器生成的参数的每个组合。

通过组合两个生成器参数来生成每种可能的组合,这使您能够获得两个生成器的内在属性。例如,许多可能用例的一小部分包括:

  • SCM Provider Generator + Cluster Generator:扫描 GitHub 组织的存储库以获取应用程序资源,并将这些资源定位到所有可用集群。
  • Git File Generator + List Generator:提供要通过配置文件部署的应用程序列表,以及可选的配置选项,并将它们部署到固定的集群列表。
  • Git Directory Generator + Cluster Decision Resource Generator:找到 Git 存储库的文件夹中包含的应用程序资源,并将它们部署到通过外部自定义资源提供的集群列表。

配置文件:https://gitee.com/evescn/argocd-example-apps/blob/main/applicationsets/generators/demo-matrix.yaml

## demo-matrix.yaml
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: cluster-git
  namespace: argocd
spec:
  generators:
    # matrix 'parent' generator
    - matrix:
        generators:
          # git generator, 'child' #1
          - git:
              repoURL: https://gitee.com/evescn/argocd-example-apps.git
              revision: main
              directories:
              - path: applicationsets/demoapps/*
          # cluster generator, 'child' #2
          - clusters: {}
  template:
    metadata:
      name: '{{path.basename}}-{{name}}'
    spec:
      project: default
      source:
        repoURL: https://gitee.com/evescn/argocd-example-apps.git
        targetRevision: main
        path: '{{path}}'
      destination:
        server: '{{server}}'
        namespace: '{{name}}-{{path.basename}}'
      syncPolicy:
        syncOptions:
          - CreateNamespace=true  
        # automated: 
        #  prune: true 

在此示例中,使用了 Matrix Generator 组合了 git generator + cluster generator,完成了在不同的集群中,基于 git 仓库中定义的 APP 配置,完成服务创建,确保每个集群中都的 APP 信息相同。

创建服务

[root@node argocd]# kubectl apply -f demo-matrix.yaml
applicationset.argoproj.io/cluster-git created

查看 Web UI 界面,自动创建了多个服务

img

点击 Sync 同步按钮

img

查看 K8S 集群信息

[root@node argocd]# kubectl get ns
NAME                       STATUS   AGE
context-cluster1-demo1     Active   53s
context-cluster1-demo2     Active   48s
context-cluster1-demo3     Active   41s
in-cluster-demo1           Active   96s
in-cluster-demo2           Active   44s
in-cluster-demo3           Active   39s

[root@node argocd]# kubectl get pods -n context-cluster1-demo1
NAME                                  READY   STATUS    RESTARTS   AGE
demo1-guestbook-ui-6cd8c8f8f7-bh7cq   1/1     Running   0          77s
demo1-guestbook-ui-6cd8c8f8f7-x2c5l   1/1     Running   0          77s

[root@node argocd]# kubectl get pods -n in-cluster-demo1
NAME                                  READY   STATUS    RESTARTS   AGE
demo1-guestbook-ui-6cd8c8f8f7-j79ng   1/1     Running   0          82s
demo1-guestbook-ui-6cd8c8f8f7-zl97z   1/1     Running   0          82s

Other Generator

其他更多生成器使用,可以查看官方文档:https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Generators/

posted @ 2023-08-16 17:25  evescn  阅读(476)  评论(0编辑  收藏  举报