Integrate Dapr with OSM

Dapr OSM Walkthrough

This document walks you through the steps of getting Dapr working with OSM on a Kubernetes cluster.

Install Dapr on your cluster with mTLS disabled:
1. Dapr has a quickstart repository to help users get familiar with dapr and its features. For this integration demo we will be leveraging the hello-kubernetes quickstart. As we would like to integrate this Dapr example with OSM, there are a few modifications required and they are as follows:
  - The hello-kubernetes demo installs Dapr with mtls enabled (by default), we would not want mtls from Dapr and would like to leverage OSM for this. Hence while installing Dapr on your cluster, make sure to disable mtls by passing the flag : --enable-mtls=false during the installation
  - Further hello-kubernetes sets up everything in the default namespace, it is strongly recommended to set up the entire hello-kubernetes demo in a specific namespace (we will later join this namespace to OSM’s mesh). For the purpose of this integration, we have the namespace as dapr-test
```
 $ kubectl create namespace dapr-test
 namespace/dapr-test created
```
  - The redis state store, redis.yaml, node.yaml and python.yaml need to be deployed in the dapr-test namespace
  - Since the resources for this demo are set up in a custom namespace. We will need to add an rbac rule on the cluster for Dapr to have access to the secrets. Create the following role and role binding:
```
kubectl apply -f - <<EOF
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: secret-reader
  namespace: dapr-test
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get", "list"]
---

kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: dapr-secret-reader
  namespace: dapr-test
subjects:
- kind: ServiceAccount
  name: default
roleRef:
  kind: Role
  name: secret-reader
  apiGroup: rbac.authorization.k8s.io
EOF
```
2. Ensure the sample applications are running with Dapr as desired.

Install OSM:

$ osm install
OSM installed successfully in namespace [osm-system] with mesh name [osm]

Enable permissive mode in OSM:

$ kubectl patch meshconfig osm-mesh-config -n osm-system -p '{"spec":{"traffic":{"enablePermissiveTrafficPolicyMode":true}}}'  --type=merge
meshconfig.config.openservicemesh.io/osm-mesh-config patched

This is necessary, so that the hello-kubernetes example works as is and no SMI policies are needed from the get go.

Exclude kubernetes API server IP from being intercepted by OSM’s sidecar:
1. Get the kubernetes API server cluster IP:
```
$ kubectl get svc -n default
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP   10.0.0.1     <none>        443/TCP   1d
```
2. Add this IP to the MeshConfig so that outbound traffic to it is excluded from interception by OSM’s sidecar
```
$ kubectl patch meshconfig osm-mesh-config -n osm-system -p '{"spec":{"traffic":{"outboundIPRangeExclusionList":["10.0.0.1/32"]}}}'  --type=merge
meshconfig.config.openservicemesh.io/osm-mesh-config patched
```
It is necessary to exclude the Kubernetes API server IP in OSM because Dapr leverages Kubernetes secrets to access the redis state store in this demo.

Note: If you have hardcoded the password in the Dapr component file, you may skip this step.
Globally exclude ports from being intercepted by OSM’s sidecar:
1. Get the ports of Dapr’s placement server (dapr-placement-server):
```
$ kubectl get svc -n dapr-system
NAME                    TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)              AGE
dapr-api                ClusterIP   10.0.172.245   <none>        80/TCP               2h
dapr-dashboard          ClusterIP   10.0.80.141    <none>        8080/TCP             2h
dapr-placement-server   ClusterIP   None           <none>        50005/TCP,8201/TCP   2h
dapr-sentry             ClusterIP   10.0.87.36     <none>        80/TCP               2h
dapr-sidecar-injector   ClusterIP   10.0.77.47     <none>        443/TCP              2h
```
2. Get the ports of your redis state store from the redis.yaml, 6379incase of this demo
3. Add these ports to the MeshConfig so that outbound traffic to it is excluded from interception by OSM’s sidecar
```
$ kubectl patch meshconfig osm-mesh-config -n osm-system -p '{"spec":{"traffic":{"outboundPortExclusionList":[50005,8201,6379]}}}'  --type=merge
meshconfig.config.openservicemesh.io/osm-mesh-config patched
```
It is necessary to globally exclude Dapr’s placement server (dapr-placement-server) port from being intercepted by OSM’s sidecar, as pods having Dapr on them would need to talk to Dapr’s control plane. The redis state store also needs to be excluded so that Dapr’s sidecar can route the traffic to redis, without being intercepted by OSM’s sidecar.

Note: Globally excluding ports would result in all pods in OSM’s mesh from not interceting any outbound traffic to the specified ports. If you wish to exclude the ports selectively only on pods that are running Dapr, you may omit this step and follow the step mentioned below.

Exclude ports from being intercepted by OSM’s sidecar at pod level:

Get the ports of Dapr’s api and sentry (dapr-sentry and dapr-api):

$ kubectl get svc -n dapr-system
NAME                    TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)              AGE
dapr-api                ClusterIP   10.0.172.245   <none>        80/TCP               2h
dapr-dashboard          ClusterIP   10.0.80.141    <none>        8080/TCP             2h
dapr-placement-server   ClusterIP   None           <none>        50005/TCP,8201/TCP   2h
dapr-sentry             ClusterIP   10.0.87.36     <none>        80/TCP               2h
dapr-sidecar-injector   ClusterIP   10.0.77.47     <none>        443/TCP              2h

Update the pod spec in both nodeapp (node.yaml) and pythonapp (python.yaml) to contain the following annotation: openservicemesh.io/outbound-port-exclusion-list: "80"

Adding the annotation to the pod excludes Dapr’s api (dapr-api) and sentry (dapr-sentry) port’s from being intercepted by OSM’s sidecar, as these pods would need to talk to Dapr’s control plane.

Make OSM monitor the namespace that was used for the Dapr hello-kubernetes demo setup:

$ osm namespace add dapr-test
Namespace [dapr-test] successfully added to mesh [osm]

Delete and re-deploy the Dapr hello-kubernetes pods:

$ kubectl delete -f ./deploy/node.yaml
service "nodeapp" deleted
deployment.apps "nodeapp" deleted

$ kubectl delete -f ./deploy/python.yaml
deployment.apps "pythonapp" deleted

$ kubectl apply -f ./deploy/node.yaml
service "nodeapp" created
deployment.apps "nodeapp" created

$ kubectl apply -f ./deploy/python.yaml
deployment.apps "pythonapp" created

The pythonapp and nodeapp pods on restart will now have 3 containers each, indicating OSM’s proxy sidecar has been successfully injected

$ kubectl get pods -n dapr-test
NAME                         READY   STATUS    RESTARTS   AGE
my-release-redis-master-0    1/1     Running   0          2h
my-release-redis-slave-0     1/1     Running   0          2h
my-release-redis-slave-1     1/1     Running   0          2h
nodeapp-7ff6cfb879-9dl2l     3/3     Running   0          68s
pythonapp-6bd9897fb7-wdmb5   3/3     Running   0          53s

Verify the Dapr hello-kubernetes demo works as expected:
1. Verify the nodeapp service using the steps documented here
2. Verify the pythonapp documented here

Applying SMI Traffic Policies:

The demo so far illustrated permissive traffic policy mode in OSM whereby application connectivity within the mesh is automatically configured by osm-controller, therefore no SMI policy was required for the pythonapp to talk to the nodeapp.

In order to see the same demo work with an SMI Traffic Policy, follow the steps outlined below:

Disable permissive mode:

$ kubectl patch meshconfig osm-mesh-config -n osm-system -p '{"spec":{"traffic":{"enablePermissiveTrafficPolicyMode":false}}}'  --type=merge
meshconfig.config.openservicemesh.io/osm-mesh-config patched

Verify the pythonapp documented here no longer causes the order ID to increment.

Create a service account for nodeapp and pythonapp:

$ kubectl create sa nodeapp -n dapr-test
serviceaccount/nodeapp created

$ kubectl create sa pythonapp -n dapr-test
serviceaccount/pythonapp created

Update the role binding on the cluster to contain the newly created service accounts:

kubectl apply -f - <<EOF
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: dapr-secret-reader
  namespace: dapr-test
subjects:
- kind: ServiceAccount
  name: default
- kind: ServiceAccount
  name: nopdeapp
- kind: ServiceAccount
  name: pythonapp
roleRef:
  kind: Role
  name: secret-reader
  apiGroup: rbac.authorization.k8s.io
EOF

Apply the following SMI access control policies:

Deploy SMI TrafficTarget

kubectl apply -f - <<EOF
---
kind: TrafficTarget
apiVersion: access.smi-spec.io/v1alpha3
metadata:
  name: pythodapp-traffic-target
  namespace: dapr-test
spec:
  destination:
    kind: ServiceAccount
    name: nodeapp
    namespace: dapr-test
  rules:
  - kind: HTTPRouteGroup
    name: nodeapp-service-routes
    matches:
    - new-order
  sources:
  - kind: ServiceAccount
    name: pythonapp
    namespace: dapr-test
EOF

Deploy HTTPRouteGroup policy

kubectl apply -f - <<EOF
---
apiVersion: specs.smi-spec.io/v1alpha4
kind: HTTPRouteGroup
metadata:
  name: nodeapp-service-routes
  namespace: dapr-test
spec:
  matches:
  - name: new-order
EOF

Update the pod spec in both nodeapp (node.yaml) and pythonapp (python.yaml) to contain their respective service accounts. Delete and re-deploy the Dapr hello-kubernetes pods
Verify the Dapr hello-kubernetes demo works as expected, shown here

Cleanup:
1. To clean up the Dapr hello-kubernetes demo, clean the dapr-test namespace
```
$ kubectl delete ns dapr-test
```
2. To uninstall Dapr, run
```
$ dapr uninstall --kubernetes
```
3. To uninstall OSM, run
```
$ osm uninstall mesh
```
4. To remove OSM’s cluster wide resources after uninstallation, run the following command. See the uninstall guide for more context and information.
```
$ osm uninstall mesh --delete-cluster-wide-resources
```

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