用ArgoCD部署應用

向ArgoCD增加Github Reop

首先向ArgoCD增加Github Reop，然後查看ArgoCD的repo列表。

<code>$ 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/<code>

通過ArgoCD部署OpenShift應用

1. 查看當前Argo管理的OpenShift或K8s集群。如果ArgoCD和OpenShift運行在一起，那麼使用本地地址（https://kubernetes.default.svc）訪問。

<code>$ argocd cluster list
SERVER                          NAME  STATUS      MESSAGE
https://kubernetes.default.svc        Successful/<code>

2. 基於Github，在ArgoCD上創建一個應用reverse-words-app，然後查看ArgoCD上的應用列表。其中ArgoCD的create命令參數有：

• --project ：ArgoCD應用程序所屬的ArgoCD項目
• --name ：ArgoCD應用程序名稱
• --repo ：Git存儲庫
• --path ：Git信息庫中存儲清單的目錄路徑
• --dest-server ：OpenShift集群
• --dest-namespace ：用於將ArgoCD應用程序部署到的OpenShift項目
• --revision ：Git存儲庫的分支
• --sync-policy ：與Git存儲庫同步的策略

<code>$ 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/<none>/<code>

3. 查看ArgoCD中的reverse-words-app應用，注意此時ArgoCD的reverse-words應用狀態和Github是“Synced”的同步狀態。

<code>$ 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/<code>

4. 查看OpenShift的Deployment和Service。

<code>$ 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/<none>/<code>

5. 創建訪問應用的Route，然後訪問reverse-words應用。

<code>$ 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"}/<code>

用ArgoCD自動更新應用配置

1. 先刪除OpenShift中reverse-words的Deployment。

<code>$ oc delete deployment reverse-words -n reverse-words
deployment.extensions "reverse-words" deleted/<code>

2. 查看ArgoCD的應用列表，確認reverse-words-app應用當前HEALTH是“Missing”的狀態，並且STATUS是“OutOfSync”狀態。

<code>$ 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/<none>/<code>

3. 查看ArgoCD的reverse-words-app應用。確認Route資源的STATUS是“OutOfSync”，而且在最後顯示“1 resources require pruning”，這是由於Route是我們手動生成的，而不是通過ArgoCD的Repo生成的。另外Deployment的HEALTH為“Progressing”狀態，這說明ArgoCD已經發現OpenShift的deployment和ArgoCD的Repo不同了，正在進行同步處理。

<code>$ 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
/<code>

4. 持續查看reverse-words的Deployment狀態變化，最後變為READY狀態。

<code>$ 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/<code>

5. 再次訪問reverse-words應用的路由，確認又可以正常訪問應用了。

<code>$ curl -X POST http://$(oc get route reverse-words -n reverse-words -o jsonpath='{.spec.host}') -d '{"word":"PALC"}'
{"reverse_word":"CLAP"}/<code>

# 用ArgoCD刪除應用配置

1. 此時進到ArgoCD的控制檯，在Application中進入reverse-words-ap，確認是“OutOfSync”狀態。其中是名為“reverse-words”的Route是黃色非同步狀態，這是由於這個對象是我們在OpenShift中直接創建的，而不是根據Github的配置創建的。

2. 點擊上圖中紅框中名為“reverse-words”的Route的右側圖標，然後選擇Delete，然後確認是Force

Delete。刪除後，ArgoCD的reverse-words-app應用又恢復了“Synced”狀態了。

3. 然後執行以下命令，確認OpenShift的名為“reverse-words”的Route對象已經被刪除了。

<code>$ oc get route
No resources found in reverse-words namespace./<code>

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關鍵字: Sync 應用 GitHub