ToDo List

An example application containing a WebLogic component

Before you begin

Install Verrazzano by following the installation instructions.
To download the example image, you must first accept the license agreement.
- In a browser, navigate to https://container-registry.oracle.com/ and sign in.
- Search for example-todo and weblogic.
- For each one:
  - Select the image name in the results.
  - From the drop-down menu, select your language and click Continue.
  - Then read and accept the license agreement.

NOTE: The ToDo List example application deployment files are contained in the Verrazzano project located at <VERRAZZANO_HOME>/examples/todo-list, where <VERRAZZANO_HOME> is the root of the Verrazzano project.

All files and paths in this document are relative to <VERRAZZANO_HOME>/examples/todo-list.

Deploy the ToDo List application

ToDo List is an example application containing a WebLogic component. For more information and the source code of this application, see the Verrazzano Examples.

Create a namespace for the ToDo List example and add a label identifying the namespace as managed by Verrazzano.

$ kubectl create namespace todo-list
$ kubectl label namespace todo-list verrazzano-managed=true istio-injection=enabled

Create a docker-registry secret to enable pulling the ToDo List example image from the registry.

$ kubectl create secret docker-registry tododomain-repo-credentials \
        --docker-server=container-registry.oracle.com \
        --docker-username=YOUR_REGISTRY_USERNAME \
        --docker-password=YOUR_REGISTRY_PASSWORD \
        --docker-email=YOUR_REGISTRY_EMAIL \
        -n todo-list

Replace YOUR_REGISTRY_USERNAME, YOUR_REGISTRY_PASSWORD, and YOUR_REGISTRY_EMAIL with the values you use to access the registry.

Create and label secrets for the WebLogic domain:

# Replace the values of the WLS_USERNAME and WLS_PASSWORD environment variables as appropriate.
$ export WLS_USERNAME=<username>
$ export WLS_PASSWORD=<password>
$ kubectl create secret generic tododomain-weblogic-credentials \
    --from-literal=password=$WLS_PASSWORD \
    --from-literal=username=$WLS_USERNAME \
    -n todo-list

$ kubectl create secret generic tododomain-jdbc-tododb \
    --from-literal=username=$WLS_USERNAME \
    --from-literal=password=$WLS_PASSWORD \
    -n todo-list

$ kubectl -n todo-list label secret tododomain-jdbc-tododb weblogic.domainUID=tododomain

Note that the ToDo List example application is preconfigured to use specific secret names. For the source code of this application, see the Verrazzano Examples.

To deploy the application, apply the example resources.

$ kubectl apply -f https://raw.githubusercontent.com/verrazzano/verrazzano/v1.1.2/examples/todo-list/todo-list-components.yaml
$ kubectl apply -f https://raw.githubusercontent.com/verrazzano/verrazzano/v1.1.2/examples/todo-list/todo-list-application.yaml

Wait for the ToDo List application to be ready. You can monitor its progress by listing pods and inspecting the output, or you can use the kubectl wait command. You may need to repeat the kubectl wait command several times before it is successful. The tododomain-adminserver pod may take a while to be created and Ready.
```
$ kubectl get pods -n todo-list

# -or- #

$ kubectl wait pod \
   --for=condition=Ready tododomain-adminserver \
   -n todo-list
```

Get the generated host name for the application.

$ HOST=$(kubectl get gateways.networking.istio.io \
     -n todo-list \
     -o jsonpath='{.items[0].spec.servers[0].hosts[0]}')
$ echo $HOST

# Sample output
todo-appconf.todo-list.10.11.12.13.nip.io

Get the EXTERNAL_IP address of the istio-ingressgateway service.

$ ADDRESS=$(kubectl get service \
     -n istio-system istio-ingressgateway \
     -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
$ echo $ADDRESS

# Sample output
10.11.12.13

Access the ToDo List application:
- Using the command line
```
# The expected response of this query is the HTML of a web page
$ curl -sk \
   https://${HOST}/todo/ \
   --resolve ${HOST}:443:${ADDRESS}
```
  If you are using nip.io, then you do not need to include --resolve.
- Local testing with a browser
  
  Temporarily, modify the /etc/hosts file (on Mac or Linux) or c:\Windows\System32\Drivers\etc\hosts file (on Windows 10), to add an entry mapping the host name to the ingress gateway’s EXTERNAL-IP address. For example:
```
10.11.12.13 todo.example.com
```
  Then, you can access the application in a browser at https://todo.example.com/todo.
  
  If you are using nip.io, then you can access the application in a browser using the HOST variable (for example, https://${HOST}/todo). If you are going through a proxy, then you may need to add *.nip.io to the NO_PROXY list.
- Using your own DNS name
  - Point your own DNS name to the ingress gateway’s EXTERNAL-IP address.
  - In this case, you would need to have edited the todo-list-application.yaml file to use the appropriate value under the hosts section (such as yourhost.your.domain), before deploying the ToDo List application.
  - Then, you can use a browser to access the application at https://<yourhost.your.domain>/todo/.
    
    Accessing the application in a browser opens the page, “Derek’s ToDo List”, with an edit field and an Add button that lets you add tasks.
A variety of endpoints associated with the deployed ToDo List application, are available to further explore the logs, metrics, and such. You can access them according to the directions here.

Access the WebLogic Server Administration Console

To access the Console from the machine where you are running kubectl:

Set up port forwarding.
```
$ kubectl port-forward pods/tododomain-adminserver 7001:7001 -n todo-list
```
NOTE: If you are using the OCI Cloud Shell to run kubectl, in order to access the Console using port forwarding, you will need to run kubectl on another machine.
Access the WebLogic Server Administration Console from your browser.
```
http://localhost:7001/console
```

NOTE

It is recommended that the WebLogic Server Administration Console not be exposed publicly.

Troubleshooting

Verify that the application configuration, domain, and ingress trait all exist.

$ kubectl get ApplicationConfiguration -n todo-list

# Sample output
NAME           AGE
todo-appconf   19h

$ kubectl get Domain -n todo-list

# Sample output
NAME          AGE
todo-domain   19h

$ kubectl get IngressTrait -n todo-list

# Sample output
NAME                           AGE
todo-domain-trait-7cbd798c96   19h

Verify that the WebLogic Administration Server and MySQL pods have been created and are running. Note that this will take several minutes.

$ kubectl get pods -n todo-list

# Sample output
NAME                     READY   STATUS    RESTARTS   AGE
mysql-5c75c8b7f-vlhck    2/2     Running   0          19h
tododomain-adminserver   4/4     Running   0          19h

Undeploy the application

To undeploy the application, delete the ToDo List OAM resources.

$ kubectl delete -f https://raw.githubusercontent.com/verrazzano/verrazzano/v1.1.2/examples/todo-list/todo-list-application.yaml
$ kubectl delete -f https://raw.githubusercontent.com/verrazzano/verrazzano/v1.1.2/examples/todo-list/todo-list-components.yaml

Delete the namespace todo-list after the application pods are terminated. The secrets created for the WebLogic domain also will be deleted.
```
$ kubectl delete namespace todo-list
```

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