OpenShift 4 之 GitOps（2）用ArgoCD部署应用
文章目录
- 用ArgoCD部署应用
- 向ArgoCD增加Github Repo
- 通过ArgoCD部署OpenShift应用
- 用ArgoCD自动更新应用配置
- 用ArgoCD删除应用配置
用ArgoCD部署应用
向ArgoCD增加Github Repo
首先向ArgoCD增加Github Reop，然后查看ArgoCD的repo列表。
$ argocd repo add https://github.com/liuxiaoyu-git/gitops-on-openshift.git
repository 'https://github.com/liuxiaoyu-git/gitops-on-openshift.git' added
$ argocd repo list
REPO INSECURE LFS USER STATUS MESSAGE
https://github.com/liuxiaoyu-git/gitops-on-openshift.git false false - Successful
通过ArgoCD部署OpenShift应用
- 查看当前Argo管理的OpenShift或K8s集群。如果ArgoCD和OpenShift运行在一起，那么使用本地地址（https://kubernetes.default.svc）访问。
$ argocd cluster list
SERVER NAME STATUS MESSAGE
https://kubernetes.default.svc Successful
- 基于Github，在ArgoCD上创建一个应用reverse-words-app，然后查看ArgoCD上的应用列表。其中ArgoCD的create命令参数有：
–project ：ArgoCD应用程序所属的ArgoCD项目
–name ：ArgoCD应用程序名称
–repo ：Git存储库
–path ：Git信息库中存储清单的目录路径
–dest-server ：OpenShift集群
–dest-namespace ：用于将ArgoCD应用程序部署到的OpenShift项目
–revision ：Git存储库的分支
–sync-policy ：与Git存储库同步的策略
$ argocd app create --project default --name reverse-words-app \
> --repo http://github.com/liuxiaoyu-git/gitops-on-openshift.git \
> --path simple-app/reversewords_app/ \
> --dest-server https://kubernetes.default.svc \
> --dest-namespace reverse-words \
> --revision master --sync-policy automated
application 'reverse-words-app' created
$ argocd app list
NAME CLUSTER NAMESPACE PROJECT STATUS HEALTH SYNCPOLICY CONDITIONS REPO PATH TARGET
reverse-words-app https://kubernetes.default.svc reverse-words default Synced Progressing Auto <none> http://github.com/liuxiaoyu-git/gitops-on-openshift.git simple-app/reversewords_app/ master
- 查看ArgoCD中的reverse-words-app应用，注意此时ArgoCD的reverse-words应用状态和Github是“Synced”的同步状态。
$ argocd app get reverse-words-app
Name: reverse-words-app
Project: default
Server: https://kubernetes.default.svc
Namespace: reverse-words
URL: https://argocd-server-argocd.apps.cluster-shanghai-c30f.shanghai-c30f.example.opentlc.com/applications/reverse-words-app
Repo: http://github.com/liuxiaoyu-git/gitops-on-openshift.git
Target: master
Path: simple-app/reversewords_app/
Sync Policy: Automated
Sync Status: Synced to master (36306dc)
Health Status: Progressing
GROUP KIND NAMESPACE NAME STATUS HEALTH HOOK MESSAGE
Namespace reverse-words reverse-words Running Synced namespace/reverse-words created
Service reverse-words reverse-words Synced Healthy service/reverse-words created
apps Deployment reverse-words reverse-words Synced Healthy deployment.apps/reverse-words created
Namespace reverse-words Synced Unknown
- 查看OpenShift的Deployment和Service。
$ oc get deployment -n reverse-words
NAME READY UP-TO-DATE AVAILABLE AGE
reverse-words 1/1 1 1 43s
$ oc get svc -n reverse-words
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
reverse-words ClusterIP 172.30.202.52 <none> 8080/TCP 53s
- 创建访问应用的Route，然后访问reverse-words应用。
$ oc expose svc reverse-words -n reverse-words
route.route.openshift.io/reverse-words exposed
$ curl -X POST http://$(oc get route reverse-words -n reverse-words -o jsonpath='{.spec.host}') -d '{"word":"PALC"}'
{"reverse_word":"CLAP"}
用ArgoCD自动更新应用配置
- 先删除OpenShift中reverse-words的Deployment。
$ oc delete deployment reverse-words -n reverse-words
deployment.extensions "reverse-words" deleted
- 查看ArgoCD的应用列表，确认reverse-words-app应用当前HEALTH是“Missing”的状态，并且STATUS是“OutOfSync”状态。
$ argocd app list
NAME CLUSTER NAMESPACE PROJECT STATUS HEALTH SYNCPOLICY CONDITIONS REPO PATH TARGET
reverse-words-app https://kubernetes.default.svc reverse-words default OutOfSync Missing Auto <none> http://github.com/liuxiaoyu-git/gitops-on-openshift.git simple-app/reversewords_app/ master
- 查看ArgoCD的reverse-words-app应用。确认Route资源的STATUS是“OutOfSync”，而且在最后显示“1 resources require pruning”，这是由于Route是我们手动生成的，而不是通过ArgoCD的Repo生成的。另外Deployment的HEALTH为“Progressing”状态，这说明ArgoCD已经发现OpenShift的deployment和ArgoCD的Repo不同了，正在进行同步处理。
$ argocd app sync reverse-words-app
TIMESTAMP GROUP KIND NAMESPACE NAME STATUS HEALTH HOOK MESSAGE
2020-03-03T16:20:38+00:00 Service reverse-words reverse-words Synced Healthy
2020-03-03T16:20:38+00:00 apps Deployment reverse-words reverse-words OutOfSync Missing
2020-03-03T16:20:38+00:00 route.openshift.io Route reverse-words reverse-words OutOfSync Unknown
2020-03-03T16:20:38+00:00 Namespace reverse-words Synced Unknown
Name: reverse-words-app
Project: default
Server: https://kubernetes.default.svc
Namespace: reverse-words
URL: https://argocd-server-argocd.apps.cluster-shanghai-c30f.shanghai-c30f.example.opentlc.com/applications/reverse-words-app
Repo: http://github.com/liuxiaoyu-git/gitops-on-openshift.git
Target: master
Path: simple-app/reversewords_app/
Sync Policy: Automated
Sync Status: OutOfSync from master (36306dc)
Health Status: Progressing
Operation: Sync
Sync Revision: 36306dc264cea403e33b756de6faf95f605fee5d
Phase: Succeeded
Start: 2020-03-03 16:20:38 +0000 UTC
Finished: 2020-03-03 16:20:40 +0000 UTC
Duration: 2s
Message: successfully synced (all tasks run)
GROUP KIND NAMESPACE NAME STATUS HEALTH HOOK MESSAGE
route.openshift.io Route reverse-words reverse-words OutOfSync Unknown ignored (requires pruning)
Namespace reverse-words reverse-words Running Synced namespace/reverse-words unchanged
Service reverse-words reverse-words Synced Healthy service/reverse-words unchanged
apps Deployment reverse-words reverse-words Synced Progressing deployment.apps/reverse-words created
Namespace reverse-words Synced Unknown
FATA[0002] 1 resources require pruning
- 持续查看reverse-words的Deployment状态变化，最后变为READY状态。
$ oc get deployment -n reverse-words -w
NAME READY UP-TO-DATE AVAILABLE AGE
reverse-words 0/1 1 0 29s
reverse-words 1/1 1 1 39s
- 再次访问reverse-words应用的路由，确认又可以正常访问应用了。
$ curl -X POST http://$(oc get route reverse-words -n reverse-words -o jsonpath='{.spec.host}') -d '{"word":"PALC"}'
{"reverse_word":"CLAP"}
用ArgoCD删除应用配置
- 此时进到ArgoCD的控制台，在Application中进入reverse-words-ap，确认是“OutOfSync”状态。其中是名为“reverse-words”的Route是黄色非同步状态，这是由于这个对象是我们在OpenShift中直接创建的，而不是根据Github的配置创建的。
- 点击上图中红框中名为“reverse-words”的Route的右侧图标，然后选择Delete，然后确认是Force
Delete。删除后，ArgoCD的reverse-words-app应用又恢复了“Synced”状态了。
- 然后执行以下命令，确认OpenShift的名为“reverse-words”的Route对象已经被删除了。
$ oc get route
No resources found in reverse-words namespace.