Standardizes loadgen behavior for Istio mTLS=STRICT (#279)

* Adds liveness probe annotation, moves loadgen initcontainer into main

* cleanup

* cleanup

* updated wrong manifests

* respond to comments

README.md

@@ -212,35 +212,28 @@ by deploying the [release manifest](./release) directly to an existing cluster.
        --istio-config=auth=MTLS_PERMISSIVE
    ```
 
-   > NOTE: If you need to enable `MTLS_STRICT` mode, you will need to update
+2. (Optional) Enable Stackdriver Tracing/Logging with Istio Stackdriver Adapter
-   > several manifest files:
-   >
-   > - `kubernetes-manifests/frontend.yaml`: delete "livenessProbe" and
-   >   "readinessProbe" fields.
-   > - `kubernetes-manifests/loadgenerator.yaml`: delete "initContainers" field.
-
-1. (Optional) Enable Stackdriver Tracing/Logging with Istio Stackdriver Adapter
    by [following this guide](https://cloud.google.com/istio/docs/istio-on-gke/installing#enabling_tracing_and_logging).
 
-1. Install the automatic sidecar injection (annotate the `default` namespace
+3. Install the automatic sidecar injection (annotate the `default` namespace
    with the label):
 
    ```sh
    kubectl label namespace default istio-injection=enabled
    ```
 
-1. Apply the manifests in [`./istio-manifests`](./istio-manifests) directory.
+4. Apply the manifests in [`./istio-manifests`](./istio-manifests) directory.
    (This is required only once.)
 
    ```sh
    kubectl apply -f ./istio-manifests
    ```
 
-1. Deploy the application with `skaffold run --default-repo=gcr.io/[PROJECT_ID]`.
+5. Deploy the application with `skaffold run --default-repo=gcr.io/[PROJECT_ID]`.
 
-1. Run `kubectl get pods` to see pods are in a healthy and ready state.
+6. Run `kubectl get pods` to see pods are in a healthy and ready state.
 
-1. Find the IP address of your Istio gateway Ingress or Service, and visit the
+7. Find the IP address of your Istio gateway Ingress or Service, and visit the
    application.
 
    ```sh

kubernetes-manifests/frontend.yaml

@@ -24,6 +24,8 @@ spec:
     metadata:
       labels:
         app: frontend
+      annotations:
+        sidecar.istio.io/rewriteAppHTTPProbers: "true"
     spec:
       containers:
         - name: server

kubernetes-manifests/loadgenerator.yaml

@@ -11,7 +11,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -25,20 +24,11 @@ spec:
     metadata:
       labels:
         app: loadgenerator
+      annotations:
+        sidecar.istio.io/rewriteAppHTTPProbers: "true"
     spec:
       terminationGracePeriodSeconds: 5
       restartPolicy: Always
-      initContainers:
-      - name: wait-frontend
-        image: alpine:3.6
-        command: ['sh', '-c', 'set -x;  apk add --no-cache curl && 
-          until timeout -t 2 curl -f "http://${FRONTEND_ADDR}"; do 
-            echo "waiting for http://${FRONTEND_ADDR}"; 
-            sleep 2;
-          done;']
-        env:
-        - name: FRONTEND_ADDR
-          value: "frontend:80"
       containers:
       - name: main
         image: loadgenerator

src/loadgenerator/Dockerfile

@@ -15,4 +15,7 @@ COPY --from=builder /install /usr/local
 
 COPY . .
 RUN chmod +x ./loadgen.sh
+RUN apt-get -qq update \
+    && apt-get install -y --no-install-recommends \
+        curl
 ENTRYPOINT ./loadgen.sh

src/loadgenerator/loadgen.sh

@@ -24,4 +24,13 @@ if [[ -z "${FRONTEND_ADDR}" ]]; then
 fi
 
 set -x
+
+# if one request to the frontend fails, then exit
+STATUSCODE=$(curl --silent --output /dev/stderr --write-out "%{http_code}" http://${FRONTEND_ADDR})
+if test $STATUSCODE -ne 200; then
+    echo "Error: Could not reach frontend - Status code: ${STATUSCODE}"
+    exit 1
+fi
+
+# else, run loadgen
 locust --host="http://${FRONTEND_ADDR}" --no-web -c "${USERS:-10}" 2>&1