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Install an Application
This walkthrough demonstrates how to install an example application on Kubernetes with kapp-controller. The example application is an HTTP server. You will use examples/simple-app-git directory for the YAML configuration.
You can use kapp or another tool such as kubectl to deploy the following YAML examples:
Install kapp-controller onto your cluster.
Install examples/default-ns-rbac.yml.
It creates
default-ns-saservice account to change resources within thedefaultnamespace. The App CR in the next step uses the service account.$ kapp deploy -a default-ns-rbac -f https://raw.githubusercontent.com/carvel-dev/kapp-controller/develop/examples/rbac/default-ns.ymlInstall examples/simple-app-git/1.yml App CR.
It specifies how to fetch, template, and deploy the example application.
$ kapp deploy -a simple-app -f https://raw.githubusercontent.com/k14s/kapp-controller/develop/examples/simple-app-git/1.yml # or... kubectl apply -f https://raw.githubusercontent.com/k14s/kapp-controller/develop/examples/simple-app-git/1.yml Changes Namespace Name Kind Conds. Age Op Wait to Rs Ri default simple-app App - - create reconcile - - Op: 1 create, 0 delete, 0 update, 0 noop, 0 exists Wait to: 1 reconcile, 0 delete, 0 noop Continue? [yN]: y 5:20:27PM: ---- applying 1 changes [0/1 done] ---- 5:20:27PM: create app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:20:27PM: ---- waiting on 1 changes [0/1 done] ---- 5:20:27PM: ongoing: reconcile app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:20:33PM: ok: reconcile app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:20:33PM: ---- applying complete [1/1 done] ---- 5:20:33PM: ---- waiting complete [1/1 done] ---- SucceededRun
kubectl get appto verify that the app is deployed.Verify the status of the App CR.
Note: As of kapp-controller v0.31.0, inspect is deactivated by default. See App CR spec for more details.
$ kapp inspect -a simple-app --status # or... kubectl get app simple-app -oyaml Resources in app 'simple-app' Namespace default Name simple-app Kind App Status conditions: - status: "True" type: ReconcileSucceeded deploy: exitCode: 0 finished: true startedAt: "2019-12-02T22:20:28Z" stdout: |- Changes Namespace Name Kind Conds. Age Op Wait to Rs Ri default simple-app Deployment - - create reconcile - - ^ simple-app Service - - create reconcile - - Op: 2 create, 0 delete, 0 update, 0 noop, 0 exists Wait to: 2 reconcile, 0 delete, 0 noop 10:20:28PM: ---- applying 2 changes [0/2 done] ---- 10:20:28PM: create service/simple-app (v1) namespace: default 10:20:28PM: create deployment/simple-app (apps/v1) namespace: default 10:20:29PM: ---- waiting on 2 changes [0/2 done] ---- 10:20:29PM: ok: reconcile service/simple-app (v1) namespace: default 10:20:29PM: ongoing: reconcile deployment/simple-app (apps/v1) namespace: default 10:20:29PM: ^ Waiting for 1 unavailable replicas 10:20:29PM: L ok: waiting on replicaset/simple-app-6fb57f844b (apps/v1) namespace: default 10:20:29PM: L ongoing: waiting on pod/simple-app-6fb57f844b-jk7d8 (v1) namespace: default 10:20:29PM: ^ Pending: ContainerCreating 10:20:29PM: ---- waiting on 1 changes [1/2 done] ---- 10:20:31PM: ok: reconcile deployment/simple-app (apps/v1) namespace: default 10:20:31PM: ---- applying complete [2/2 done] ---- 10:20:31PM: ---- waiting complete [2/2 done] ---- Succeeded updatedAt: "2019-12-02T22:20:31Z" fetch: exitCode: 0 startedAt: "2019-12-02T22:20:27Z" updatedAt: "2019-12-02T22:20:27Z" inspect: exitCode: 0 stdout: |- Resources in app 'simple-app-ctrl' Namespace Name Kind Owner Conds. Rs Ri Age default simple-app Deployment kapp 2/2 t ok - 4s default L simple-app-6fb57f844b ReplicaSet cluster - ok - 4s default L.. simple-app-6fb57f844b-jk7d8 Pod cluster 4/4 t ok - 4s default simple-app Service kapp - ok - 4s default L simple-app Endpoints cluster - ok - 4s Rs: Reconcile state Ri: Reconcile information 5 resources Succeeded updatedAt: "2019-12-02T22:20:32Z" observedGeneration: 2 template: exitCode: 0 updatedAt: "2019-12-02T22:20:28Z" 1 resources SucceededThe output shows the overall status of the application, including the latest deploy output (
status.deploy.stdout) and the latest inspect output (status.inspect.stdout). Based on the inspect output you can see that the app included aDeploymentand aService.Update
simple-appApp CR to reconfigure it.This example changes data values for ytt templates.
$ kapp deploy -a simple-app -f https://raw.githubusercontent.com/k14s/kapp-controller/develop/examples/simple-app-git/2.yml -c # or... kubectl apply -f https://raw.githubusercontent.com/k14s/kapp-controller/develop/examples/simple-app-git/2.yml --- update app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default ... 23, 23 template: 24 - - ytt: {} 24 + - ytt: 25 + inline: 26 + pathsFrom: 27 + - secretRef: 28 + name: simple-app-values 25, 29 status: 26, 30 conditions: --- create secret/simple-app-values (v1) namespace: default 0 + apiVersion: v1 1 + kind: Secret 2 + metadata: 3 + labels: 4 + kapp.k14s.io/app: "1575325198404867000" 5 + kapp.k14s.io/association: v1.7a671029ad7db07aa797301eac59e9ad 6 + name: simple-app-values 7 + namespace: default 8 + stringData: 9 + values2.yml: | 10 + #@data/values 11 + --- 12 + hello_msg: updated 13 + Changes Namespace Name Kind Conds. Age Op Wait to Rs Ri default simple-app App 1/1 t 2m update reconcile ok - ^ simple-app-values Secret - - create reconcile - - Op: 1 create, 0 delete, 1 update, 0 noop, 0 exists Wait to: 2 reconcile, 0 delete, 0 noop Continue? [yN]: y 5:23:13PM: ---- applying 2 changes [0/2 done] ---- 5:23:13PM: update app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:23:13PM: create secret/simple-app-values (v1) namespace: default 5:23:14PM: ---- waiting on 2 changes [0/2 done] ---- 5:23:14PM: ongoing: reconcile app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:23:14PM: ok: reconcile secret/simple-app-values (v1) namespace: default 5:23:14PM: ---- waiting on 1 changes [1/2 done] ---- 5:23:17PM: ok: reconcile app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:23:17PM: ---- applying complete [2/2 done] ---- 5:23:17PM: ---- waiting complete [2/2 done] ---- SucceededDelete the
simple-appApp CR.$ kapp delete -a simple-app # or... kubectl delete -f https://raw.githubusercontent.com/k14s/kapp-controller/develop/examples/simple-app-git/2.yml Changes Namespace Name Kind Conds. Age Op Wait to Rs Ri default simple-app App 1/1 t 6m delete delete ok - ^ simple-app-values Secret - 3m delete delete ok - Op: 0 create, 2 delete, 0 update, 0 noop, 0 exists Wait to: 0 reconcile, 2 delete, 0 noop Continue? [yN]: y 5:26:25PM: ---- applying 2 changes [0/2 done] ---- 5:26:25PM: delete secret/simple-app-values (v1) namespace: default 5:26:25PM: delete app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:26:26PM: ---- waiting on 2 changes [0/2 done] ---- 5:26:26PM: ok: delete secret/simple-app-values (v1) namespace: default 5:26:26PM: ongoing: delete app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:26:26PM: ---- waiting on 1 changes [1/2 done] ---- 5:26:30PM: ok: delete app/simple-app (kappctrl.k14s.io/v1alpha1) namespace: default 5:26:30PM: ---- applying complete [2/2 done] ---- 5:26:30PM: ---- waiting complete [2/2 done] ---- Succeeded
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