• 【云原生 | Kubernetes 系列】--Gitops持续交付 ArgoCD 部署与概念

    1. Pull Pipeline

    使用Pull Pipeline可以不在集群以外的地方保存凭据,避免凭据泄露的风险

    工作模式:

    1. 两个Git仓库.

      1. 程序代码 程序员维护

        分支策略
        Hotfix
        Feature
        Develop
        Release
        Master

      2. 部署配置 基于OAM管理

    2. Updater

      CI流水线交付了新的Image

    3. Operator

      1. Spec 期望状态

        1. 当分支提交合并,那么部署配置中的相应配置也应随之改变.

      2. Status 实际状态

        1. 从实际状态去读期望状态.

      3. 环境

        1. 根据不同分支,对应不同的环境(develoy,stage,production)

    2. Stages in Gitops Ci Pipeline 分支策略

    1. Pre-build Stage构建预备阶段
      1. Pull Request
      2. Code Review
      3. Vulnerability Scan(漏扫)
      4. Code Analysis
    2. Build Stage
      1. Build
      2. Unit Test
      3. Code Coverage
      4. Docker Build
      5. Docker Push
    3. GitOps CI Stage
      1. Git Clone Config Repo
      2. Update Mainfests
      3. Git Commit & Git Push
    4. Post-build Stage
      1. Publish CI Metrics
      2. Build Notification
    5. GitOps CD Stage
      1. Git Clone Config Repo
      2. Discover Manifests
      3. kubectl apply Helm Install
    6. Post-deployment Stage
      1. Function Test
      2. Runtime Vulnerability
      3. Publish CD Metrics

    3. 分支策略

    3.1 单分支策略

    通常单分支策略也称为Featrue Branch Workflow,其中Master Branch承载项目变更历史.
    研发人员创建短生命周期的Featrue分支,完成Feature目标相关的研发任务.
    Feature开发完成后,通过PR流程,请求将代码合并至Master Branch
    PR得到确认后,CI Pipeline即被触发,直至最后将Image推送至Registry
    测试,预发布,生产使用同一个镜像.所有代码变更都生成在master分支上.

    3.2 多分支策略

    多分支策略较适用于需要多团队或外部协作的大型项目的管理场景,并且存在多个不同的变种,较为主流是Gitflow模型
    Gitflow模型使用Develop Branch保存项目变更历史,而使用Master Branch承载生产发布历史
    Feature开发依然使用短生命周期的Feature Branch进行,并在开发目标达成后将代码合并到Develop Branch
    计划发布时,将从最新的Develop Branch创建一个短生命周期的Release Branch,基于该分支进行持续测试和Bug修复,直到满足生产标准
    Gitflow策略中,仅Release Branch CI过程中生成的镜像才允许部署到生产环境,Develop Branch CI生成的镜像只能用于发布前测试及集成测试,显然.回滚时,也只能使用Release Branch此前的CI Pipeline生成的镜像
    用于修复Bug的Hotfix Branch要基于Master Branch创建,同时也需要一个独立CI Pipeline完成必要的CI过程

    4. 主流交付方式

    交付方式含义缺陷
    Deployment滚动仅适用于无状态服务,向后兼容存在问题
    Blue-Green蓝绿需要2个环境,可以适用有状态服务
    Canary金丝雀较长的部署时间,一段较长的时间内并存2个版本,仅适用于无状态服务
    Progressive渐进需要引入监控指标来判定部署结果,较为复杂,仅适用于无状态服务

    5. Argocd

    ​ Argo:
    ​ CD Gitops
    ​ Rollouts -->> 取代Deployment,是ArgoCD的高级交付策略工具
    ​ Workflow 工作流编排
    ​ Events 触发k8s中的Argo工作流和其他操作

    Gitops 基于pull pipeline需要依赖于部署并运行在k8s中的Operator.Operator始终监视着配置仓库,并把配置仓库中定义的以声明式的资源部署到目标集群上.确保status始终接近甚至等同spec中的定义.

    Argocd部署并运行在k8s环境上的一个应用.其本身就是一个Operator.
    它能够读取Git配置仓库中的定义的部署配置清单.
    根据配置清单进行分析,并将其部署到目标集群上.

    Argocd会为每一个Application Controller提供一组CRD,用于描述某一个应用程序相关的所有资源应用程序的CRD叫做Application

    以特定Repository(配置仓库)作为应用程序部署和管理的唯一可信源,该Repository负责定义Application的期望状态
    Application Controller负责将Repository中定义的Application运行于一个特定的目标k8s cluster之上.
    Application Controller持续监视,对比Application的期望状态和实际状态,并确保实际状态与期望状态一致.

    5.1 ArgoCD主要功能

    可以协同使用各种配置管理工具(如Ksonnet/jsonnet,Helm和Kustomize)确保应用程序的真实状态与GitRepo中定义的期望状态保持一致

    将应用程序自动部署到指定的目标环境

    持续监控已部署的应用程序

    基于web和cli的操作接口,以及应用程序可视化

    部署或回滚到GitRepo仓库中提交的应用程序的任何状态

    PreSync,Sync,PostSync Hooks以支持复杂的应用程序部署策略
    例如:blue/green和canary

    SSO集成
    劫持OIDC,LDAP,SAML2.0,GitLab,Microsoft,LinkedIn等

    Webhook集成
    GitHub,BitBucket和GitLab

    可以独立使用,也可以作为现有Pipeline的一部分使用,例如与Argo Workflow,Jenkins,以及GitLab CI等配合使用

    5.2 ArgoCD CRD

    1. Application CRD

    定义由ArgoCD管理的应用程序
    定义的这些应用程序受控于Application Controller

    1. ApplicationSet CRD

    以模板化形式自动生成由ArgoCD管理的应用程序
    支持从多个不同的角度构建模板,例如不同的Git Repo或者不同的Kubernetes Cluster等
    ApplicationSet受控于专用的ApplicationSet Controller

    1. AppProject CRD

    为Application提供逻辑分组,同时提供:
    1. 限制可用部署内容(白名单)
    1. 限制应用程序可以部署到的目标位置(集群或名称空间)
    1. 限制可以部署或不能部署的资源类型(RBAC,CRD,DaemonSet等)

    每个Application都必须隶属于AppProject,未指定时,则隶属于名为"default"的默认项目

    default项目可以被修改,但不能被删除

    5.3 ArgoCd的两种状态

    1. Sync Status
      1. synced 一致
      2. OutofSync 不一致
    2. Health Status
      1. Healthy 健康
      2. Processing 处于尝试转为健康状态的进程中
      3. Degraded 降级
      4. Missing 缺失,在GitRepo中存在资源定义,但未完成部署

    6. ArgoCD部署

    https://argo-cd.readthedocs.io/en/stable/

    镜像获取(这里就不再重复了,可以参考之前的文章)

    6.1 部署ArgoCD

    kubectl create namespace argocd
wget https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
sed -i 's#quay.io#harbor.intra.com#g' -i 's#ghcr.io/dexidp#harbor.intra.com/argoproj#g'  install.yaml
sed -i 's#ghcr.io/dexidp#harbor.intra.com/argoproj#g' install.yaml
sed -i 's#redis:7.0.5-alpine#harbor.intra.com/argoproj/redis:7.0.5-alpine#g' install.yaml
kubectl apply -n argocd -f install.yaml

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    一堆被创建

    root@k8s-master-01:~/argocd# kubectl create namespace argocd
namespace/argocd created
root@k8s-master-01:~/argocd# kubectl apply -n argocd -f install.yaml
customresourcedefinition.apiextensions.k8s.io/applications.argoproj.io created
customresourcedefinition.apiextensions.k8s.io/applicationsets.argoproj.io created
customresourcedefinition.apiextensions.k8s.io/appprojects.argoproj.io created
serviceaccount/argocd-application-controller created
serviceaccount/argocd-applicationset-controller created
serviceaccount/argocd-dex-server created
serviceaccount/argocd-notifications-controller created
serviceaccount/argocd-redis created
serviceaccount/argocd-repo-server created
serviceaccount/argocd-server created
role.rbac.authorization.k8s.io/argocd-application-controller created
role.rbac.authorization.k8s.io/argocd-applicationset-controller created
role.rbac.authorization.k8s.io/argocd-dex-server created
role.rbac.authorization.k8s.io/argocd-notifications-controller created
role.rbac.authorization.k8s.io/argocd-server created
clusterrole.rbac.authorization.k8s.io/argocd-application-controller created
clusterrole.rbac.authorization.k8s.io/argocd-server created
rolebinding.rbac.authorization.k8s.io/argocd-application-controller created
rolebinding.rbac.authorization.k8s.io/argocd-applicationset-controller created
rolebinding.rbac.authorization.k8s.io/argocd-dex-server created
rolebinding.rbac.authorization.k8s.io/argocd-notifications-controller created
rolebinding.rbac.authorization.k8s.io/argocd-redis created
rolebinding.rbac.authorization.k8s.io/argocd-server created
clusterrolebinding.rbac.authorization.k8s.io/argocd-application-controller created
clusterrolebinding.rbac.authorization.k8s.io/argocd-server created
configmap/argocd-cm created
configmap/argocd-cmd-params-cm created
configmap/argocd-gpg-keys-cm created
configmap/argocd-notifications-cm created
configmap/argocd-rbac-cm created
configmap/argocd-ssh-known-hosts-cm created
configmap/argocd-tls-certs-cm created
secret/argocd-notifications-secret created
secret/argocd-secret created
service/argocd-applicationset-controller created
service/argocd-dex-server created
service/argocd-metrics created
service/argocd-notifications-controller-metrics created
service/argocd-redis created
service/argocd-repo-server created
service/argocd-server created
service/argocd-server-metrics created
deployment.apps/argocd-applicationset-controller created
deployment.apps/argocd-dex-server created
deployment.apps/argocd-notifications-controller created
deployment.apps/argocd-redis created
deployment.apps/argocd-repo-server created
deployment.apps/argocd-server created
statefulset.apps/argocd-application-controller created
networkpolicy.networking.k8s.io/argocd-application-controller-network-policy created
networkpolicy.networking.k8s.io/argocd-applicationset-controller-network-policy created
networkpolicy.networking.k8s.io/argocd-dex-server-network-policy created
networkpolicy.networking.k8s.io/argocd-notifications-controller-network-policy created
networkpolicy.networking.k8s.io/argocd-redis-network-policy created
networkpolicy.networking.k8s.io/argocd-repo-server-network-policy created
networkpolicy.networking.k8s.io/argocd-server-network-policy created
root@k8s-master-01:~/argocd# kubectl get pods -n argocd 
NAME                                               READY   STATUS    RESTARTS   AGE
argocd-application-controller-0                    1/1     Running   0          39s
argocd-applicationset-controller-c76998cc5-dd9x7   1/1     Running   0          40s
argocd-dex-server-746dbc4fbb-cntg6                 1/1     Running   0          40s
argocd-notifications-controller-66dbfdb64c-djrcw   1/1     Running   0          40s
argocd-redis-846547fb9-vb86p                       1/1     Running   0          40s
argocd-repo-server-6d4cb54bd6-fkg2n                1/1     Running   0          40s
argocd-server-54fdfb8dbc-ghd6s                     1/1     Running   0          39s
root@k8s-master-01:~/argocd# kubectl api-resources --api-group=argoproj.io
NAME              SHORTNAMES         APIVERSION             NAMESPACED   KIND
applications      app,apps           argoproj.io/v1alpha1   true         Application
applicationsets   appset,appsets     argoproj.io/v1alpha1   true         ApplicationSet
appprojects       appproj,appprojs   argoproj.io/v1alpha1   true         AppProject
root@k8s-master-01:~/argocd# kubectl get svc -n argocd
NAME                                      TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
argocd-applicationset-controller          ClusterIP   10.200.151.251   <none>        7000/TCP,8080/TCP            86s
argocd-dex-server                         ClusterIP   10.200.63.154    <none>        5556/TCP,5557/TCP,5558/TCP   85s
argocd-metrics                            ClusterIP   10.200.109.51    <none>        8082/TCP                     85s
argocd-notifications-controller-metrics   ClusterIP   10.200.6.84      <none>        9001/TCP                     85s
argocd-redis                              ClusterIP   10.200.186.15    <none>        6379/TCP                     85s
argocd-repo-server                        ClusterIP   10.200.156.235   <none>        8081/TCP,8084/TCP            85s
argocd-server                             ClusterIP   10.200.51.93     <none>        80/TCP,443/TCP               85s
argocd-server-metrics                     ClusterIP   10.200.49.65     <none>        8083/TCP                     85s 

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    6.2 部署ArgoCD UI

    argocd-dashboard-virtualservice.yaml

    apiVersion: networking.istio.io/v1beta1
kind: Gateway
metadata:
  name: argocd-dashboard-gateway
  namespace: istio-system
spec:
  selector:
    app: istio-ingressgateway
  servers:
    - hosts:
        - "argocd.intra.com"
      port:
        number: 80
        name: http
        protocol: HTTP
      tls:
        httpsRedirect: true
    - hosts:
        - "argocd.intra.com"
      port:
        number: 443
        name: https
        protocol: HTTPS
      tls:
        mode: PASSTHROUGH
---
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: argocd-dashboard-virtualservice
  namespace: argocd
spec:
  hosts:
  - "argocd.intra.com"
  gateways:
  - istio-system/argocd-dashboard-gateway
  tls:
  - match:
    - port: 443
      sniHosts:
      - argocd.intra.com
    route:
    - destination:
        host: argocd-server
        port:
          number: 443

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    部署

    # kubectl apply -f argocd-dashboard-virtualservice.yaml 
gateway.networking.istio.io/argocd-dashboard-gateway created
virtualservice.networking.istio.io/argocd-dashboard-virtualservice created
# kubectl get vs -n argocd 
NAME                              GATEWAYS                                    HOSTS                  AGE
argocd-dashboard-virtualservice   ["istio-system/argocd-dashboard-gateway"]   ["argocd.intra.com"]   89s

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    6.3 部署ArgoCD CLI

    wget https://github.com/argoproj/argo-cd/releases/download/v2.5.2/argocd-linux-amd64
chmod +x argocd-linux-amd64
mv argocd-linux-amd64 argocd
ln -sf /root/argocd/argocd /usr/local/bin/argocd

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    argocd命令补全

    echo "source <(argocd completion bash)" >> ~/.bashrc
source ~/.bashrc

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    6.4 使用命令行登录

    # kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 -d; echo
EuOxjuuJ4R2kJd2A

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    确保域名能被解析

    # ping argocd.intra.com -c 1
PING kiali.intra.com (192.168.31.163) 56(84) bytes of data.
64 bytes from kiali.intra.com (192.168.31.163): icmp_seq=1 ttl=64 time=0.052 ms

--- kiali.intra.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.052/0.052/0.052/0.000 ms

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    登录argocd

    # argocd login argocd.intra.com
WARNING: server certificate had error: x509: certificate is valid for localhost, argocd-server, argocd-server.argocd, argocd-server.argocd.svc, argocd-server.argocd.svc.cluster.local, not argocd.intra.com. Proceed insecurely (y/n)? y
Username: admin
Password: 
'admin:login' logged in successfully
Context 'argocd.intra.com' updated

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    修改默认密码(密码8-32位,所以不能太短)

    # argocd account update-password
*** Enter password of currently logged in user (admin): #这里输入之前的密码
*** Enter new password for user admin: # 新密码8-32位
*** Confirm new password for user admin: # 新密码8-32位
Password updated
Context 'argocd.intra.com' updated

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    此时再次查看argocd版本

    # argocd version
argocd: v2.5.2+148d8da
  BuildDate: 2022-11-07T17:06:04Z
  GitCommit: 148d8da7a996f6c9f4d102fdd8e688c2ff3fd8c7
  GitTreeState: clean
  GoVersion: go1.18.7
  Compiler: gc
  Platform: linux/amd64
argocd-server: v2.5.2+148d8da
  BuildDate: 2022-11-07T16:42:47Z
  GitCommit: 148d8da7a996f6c9f4d102fdd8e688c2ff3fd8c7
  GitTreeState: clean
  GoVersion: go1.18.8
  Compiler: gc
  Platform: linux/amd64
  Kustomize Version: v4.5.7 2022-08-02T16:35:54Z
  Helm Version: v3.10.1+g9f88ccb
  Kubectl Version: v0.24.2
  Jsonnet Version: v0.18.0

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    此时可以在客户端绑定hosts后通过浏览器访问到argocd的dashboard了

    请添加图片描述

    请添加图片描述

    到此为止Argocd安装完成

    # argocd app create guestbook --repo http://192.168.31.199/root/argocd-example-apps.git --path guestbook --dest-server https://kubernetes.default.svc --dest-namespace default
application 'guestbook' created
# kubectl get applications -n argocd 
NAME        SYNC STATUS   HEALTH STATUS
guestbook   OutOfSync     Missing

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    由于还没有进行操作,所以状态是OutOfSync

    请添加图片描述

    请添加图片描述

    请添加图片描述

    此时

    root@k8s-master-01:~/git/argocd-example-apps# kubectl get pods 
NAME                                        READY   STATUS              RESTARTS      AGE
ehelp-7f6b554776-v4ph4                      0/1     ContainerCreating   0             15d
el-gitlab-event-listener-75497dbb79-2mgjf   1/1     Running             3 (10d ago)   10d
el-s2i-listener-7c78cc48c-5jzmg             1/1     Running             0             10d
guestbook-ui-85985d774c-2tl8w               1/1     Running             0             20m
test-centos-pod                             1/1     Running             3 (10d ago)   17d
# kubectl get app -n argocd
NAME        SYNC STATUS   HEALTH STATUS
guestbook   Synced        Healthy
# argocd app list
NAME              CLUSTER                         NAMESPACE  PROJECT  STATUS  HEALTH   SYNCPOLICY  CONDITIONS  REPO                                                PATH       TARGET
argocd/guestbook  https://kubernetes.default.svc  default    default  Synced  Healthy  <none>      <none>      http://192.168.31.199/root/argocd-example-apps.git  guestbook
# argocd app get guestbook
Name:               argocd/guestbook
Project:            default
Server:             https://kubernetes.default.svc
Namespace:          default
URL:                https://argocd.intra.com/applications/guestbook
Repo:               http://192.168.31.199/root/argocd-example-apps.git
Target:             
Path:               guestbook
SyncWindow:         Sync Allowed
Sync Policy:        <none>
Sync Status:        Synced to  (58982ea)
Health Status:      Healthy

GROUP  KIND        NAMESPACE  NAME          STATUS  HEALTH   HOOK  MESSAGE
       Service     default    guestbook-ui  Synced  Healthy        service/guestbook-ui created
apps   Deployment  default    guestbook-ui  Synced  Healthy        deployment.apps/guestbook-ui created

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    7. 手动创建一个ArgoCD App

    请添加图片描述

    请添加图片描述

    root@k8s-master-01:~/git/argocd-example-apps# kubectl get pods -n helloworld 
NAME                                      READY   STATUS    RESTARTS   AGE
spring-boot-helloworld-766794dd78-44j4m   1/1     Running   0          48s
spring-boot-helloworld-766794dd78-7tbmf   1/1     Running   0          48s
spring-boot-helloworld-766794dd78-c48kx   1/1     Running   0          48s
# kubectl get svc -n helloworld 
NAME                     TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
spring-boot-helloworld   ClusterIP   10.200.229.42   <none>        80/TCP    5m47s
# curl 10.200.229.42
Hello Spring Boot 2.0!

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    请添加图片描述

    由于这里没有自动health

    同步前Pod中的镜像为V0.8.0

    # kubectl get pods spring-boot-helloworld-766794dd78-44j4m  -n helloworld  -o yaml|grep v0.8
  - image: harbor.intra.com/argocd/spring-boot-helloworld:v0.8.0
    image: harbor.intra.com/argocd/spring-boot-helloworld:v0.8.0

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    手动同步

    root@k8s-master-01:~/git/argocd-example-apps# argocd app list
NAME                           CLUSTER                         NAMESPACE  PROJECT  STATUS  HEALTH   SYNCPOLICY  CONDITIONS  REPO                                                              PATH        TARGET
argocd/guestbook               https://kubernetes.default.svc  default    default  Synced  Healthy  <none>      <none>      http://192.168.31.199/root/argocd-example-apps.git                guestbook   
argocd/spring-boot-helloworld  https://kubernetes.default.svc             default  Synced  Healthy  Auto        <none>      http://192.168.31.199/root/spring-boot-helloworld-deployment.git  kubernetes  HEAD
root@k8s-master-01:~/git/argocd-example-apps# argocd app sync argocd/spring-boot-helloworld
TIMESTAMP                  GROUP        KIND   NAMESPACE                  NAME      STATUS   HEALTH        HOOK  MESSAGE
2022-11-18T16:35:43+08:00          Namespace                        helloworld      Synced                       
2022-11-18T16:35:43+08:00            Service  helloworld  spring-boot-helloworld    Synced  Healthy              
2022-11-18T16:35:43+08:00   apps  Deployment  helloworld  spring-boot-helloworld    Synced  Healthy              
2022-11-18T16:35:43+08:00          Namespace                        helloworld      Synced                       namespace/helloworld unchanged
2022-11-18T16:35:43+08:00            Service  helloworld  spring-boot-helloworld    Synced  Healthy              service/spring-boot-helloworld unchanged
2022-11-18T16:35:43+08:00   apps  Deployment  helloworld  spring-boot-helloworld    Synced  Healthy              deployment.apps/spring-boot-helloworld configured
2022-11-18T16:35:43+08:00   apps  Deployment  helloworld  spring-boot-helloworld  OutOfSync  Progressing              deployment.apps/spring-boot-helloworld configured

Name:               argocd/spring-boot-helloworld
Project:            default
Server:             https://kubernetes.default.svc
Namespace:          
URL:                https://argocd.intra.com/applications/argocd/spring-boot-helloworld
Repo:               http://192.168.31.199/root/spring-boot-helloworld-deployment.git
Target:             HEAD
Path:               kubernetes
SyncWindow:         Sync Allowed
Sync Policy:        Automated
Sync Status:        Synced to HEAD (bbf73a3)
Health Status:      Progressing

Operation:          Sync
Sync Revision:      bbf73a31cb13c11dc9d82717119bc03df7aac040
Phase:              Succeeded
Start:              2022-11-18 16:35:42 +0800 CST
Finished:           2022-11-18 16:35:43 +0800 CST
Duration:           1s
Message:            successfully synced (all tasks run)

GROUP  KIND        NAMESPACE   NAME                    STATUS  HEALTH       HOOK  MESSAGE
       Namespace               helloworld              Synced                     namespace/helloworld unchanged
       Service     helloworld  spring-boot-helloworld  Synced  Healthy            service/spring-boot-helloworld unchanged
apps   Deployment  helloworld  spring-boot-helloworld  Synced  Progressing        deployment.apps/spring-boot-helloworld configured

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    同步后镜像版本成为v0.8.1

    # kubectl get pods spring-boot-helloworld-6db9d64d49-8mbt8  -n helloworld  -o yaml|grep v0.8
  - image: harbor.intra.com/argocd/spring-boot-helloworld:v0.8.1
    image: harbor.intra.com/argocd/spring-boot-helloworld:v0.8.1

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    再次修改将image改为v0.8.2,一段时间后自动更新了images

    # argocd app history argocd/spring-boot-helloworld
ID  DATE                           REVISION
0   2022-11-18 16:22:17 +0800 CST  HEAD (d3f19ac)
1   2022-11-18 16:35:43 +0800 CST  HEAD (bbf73a3)
# argocd app history argocd/spring-boot-helloworld
ID  DATE                           REVISION
0   2022-11-18 16:22:17 +0800 CST  HEAD (d3f19ac)
1   2022-11-18 16:35:43 +0800 CST  HEAD (bbf73a3)
2   2022-11-18 16:45:39 +0800 CST  HEAD (b82bb4a)

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  • 原文地址：https://blog.csdn.net/qq_29974229/article/details/127926078