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+---
+title: Failover 
+---
+
+Active-passive failover in an API gateway setup is like having a backup plan in place to keep things
+running smoothly if something goes wrong. Here’s why it’s valuable:
+
+* Staying Online: When the main (or "active") backend has issues or goes offline,
+the fallback (or "passive") backend is ready to step in instantly.
+This helps keep your API accessible and your services running, so users don’t even notice any interruptions.
+
+* Automatic Switch Over: If a problem occurs, the system can automatically switch traffic over to the fallback backend. 
+This avoids needing someone to jump in and fix things manually, which could take time and might even lead to mistakes.
+
+* Lower Costs: In an active-passive setup, the fallback backend doesn’t need to work all the time—it’s just on standby. 
+This can save on costs (like cloud egress costs) compared to setups where both backend are running at full capacity.
+
+* Peace of Mind with Redundancy: Although the fallback backend isn’t handling traffic daily, it's there as a safety net.
+If something happens with the primary backend, the backup can take over immediately, ensuring your service doesn’t skip a beat.
+
+## Prerequisites
+
+{{< boilerplate prerequisites >}}
+
+## Test
+
+* We'll first create two services & deployments, called `active` and `passive`, representing an `active` and `passive` backend application.
+
+{{< tabpane text=true >}}
+{{% tab header="Apply from stdin" %}}
+
+```shell
+cat <<EOF | kubectl apply -f -
+apiVersion: v1
+kind: Service
+metadata:
+  name: active 
+  labels:
+    app: active
+    service: active
+spec:
+  ports:
+    - name: http
+      port: 3000
+      targetPort: 3000
+  selector:
+    app: active
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: active
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: active
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: active
+        version: v1
+    spec:
+      containers:
+        - image: gcr.io/k8s-staging-gateway-api/echo-basic:v20231214-v1.0.0-140-gf544a46e
+          imagePullPolicy: IfNotPresent
+          name: active 
+          ports:
+            - containerPort: 3000
+          env:
+            - name: POD_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
+            - name: NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: passive 
+  labels:
+    app: passive
+    service: passive
+spec:
+  ports:
+    - name: http
+      port: 3000
+      targetPort: 3000
+  selector:
+    app: passive
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: passive
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: passive
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: passive
+        version: v1
+    spec:
+      containers:
+        - image: gcr.io/k8s-staging-gateway-api/echo-basic:v20231214-v1.0.0-140-gf544a46e
+          imagePullPolicy: IfNotPresent
+          name: passive 
+          ports:
+            - containerPort: 3000
+          env:
+            - name: POD_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
+            - name: NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
+EOF
+```
+
+{{% /tab %}}
+{{% tab header="Apply from file" %}}
+Save and apply the following resource to your cluster:
+
+```yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: active 
+  labels:
+    app: active
+    service: active
+spec:
+  ports:
+    - name: http
+      port: 3000
+      targetPort: 3000
+  selector:
+    app: active
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: active
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: active
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: active
+        version: v1
+    spec:
+      containers:
+        - image: gcr.io/k8s-staging-gateway-api/echo-basic:v20231214-v1.0.0-140-gf544a46e
+          imagePullPolicy: IfNotPresent
+          name: active 
+          ports:
+            - containerPort: 3000
+          env:
+            - name: POD_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
+            - name: NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: passive 
+  labels:
+    app: passive
+    service: passive
+spec:
+  ports:
+    - name: http
+      port: 3000
+      targetPort: 3000
+  selector:
+    app: passive
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: passive
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: passive
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: passive
+        version: v1
+    spec:
+      containers:
+        - image: gcr.io/k8s-staging-gateway-api/echo-basic:v20231214-v1.0.0-140-gf544a46e
+          imagePullPolicy: IfNotPresent
+          name: passive 
+          ports:
+            - containerPort: 3000
+          env:
+            - name: POD_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
+            - name: NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
+```
+
+{{% /tab %}}
+{{< /tabpane >}}
+
+
+* Follow the instructions [here](./../../tasks/traffic/backend/#enable-backend) to enable the Backend API
+
+* Create two Backend resources that are used to represent the `active` backend and `passive` backend.
+Note, we've set `fallback: true` for the `passive` backend to indicate its a passive backend
+
+
+{{< tabpane text=true >}}
+{{% tab header="Apply from stdin" %}}
+
+```shell
+cat <<EOF | kubectl apply -f -
+---
+apiVersion: gateway.envoyproxy.io/v1alpha1
+kind: Backend
+metadata:
+  name: passive 
+spec:
+  fallback: true
+  endpoints:
+    - fqdn:
+        hostname: passive.default.svc.cluster.local
+        port: 3000 
+---
+apiVersion: gateway.envoyproxy.io/v1alpha1
+kind: Backend
+metadata:
+  name: active
+spec:
+  endpoints:
+  - fqdn:
+      hostname: active.default.svc.cluster.local 
+      port: 3000
+---
+EOF
+```
+
+{{% /tab %}}
+{{% tab header="Apply from file" %}}
+Save and apply the following resources to your cluster:
+
+```yaml
+---
+apiVersion: gateway.envoyproxy.io/v1alpha1
+kind: Backend
+metadata:
+  name: passive 
+spec:
+  fallback: true
+  endpoints:
+    - fqdn:
+        hostname: passive.default.svc.cluster.local
+        port: 3000 
+---
+apiVersion: gateway.envoyproxy.io/v1alpha1
+kind: Backend
+metadata:
+  name: active
+spec:
+  endpoints:
+  - fqdn:
+      hostname: active.default.svc.cluster.local 
+      port: 3000
+---
+```
+
+{{% /tab %}}
+{{< /tabpane >}}
+
+* Lets create an HTTPRoute that can route to both these backends
+
+{{< tabpane text=true >}}
+{{% tab header="Apply from stdin" %}}
+
+```shell
+cat <<EOF | kubectl apply -f -
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: ha-example
+  namespace: default
+spec:
+  hostnames:
+  - www.example.com
+  parentRefs:
+  - group: gateway.networking.k8s.io
+    kind: Gateway
+    name: eg 
+    namespace: default
+  rules:
+  - backendRefs:
+    - group: gateway.envoyproxy.io
+      kind: Backend
+      name: active
+      namespace: default
+      port: 3000
+    - group: gateway.envoyproxy.io
+      kind: Backend
+      name: passive 
+      namespace: default
+      port: 3000
+    matches:
+    - path:
+        type: PathPrefix
+        value: /test
+EOF
+```
+
+{{% /tab %}}
+{{% tab header="Apply from file" %}}
+Save and apply the following resources to your cluster:
+
+```yaml
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: ha-example
+  namespace: default
+spec:
+  hostnames:
+  - www.example.com
+  parentRefs:
+  - group: gateway.networking.k8s.io
+    kind: Gateway
+    name: eg 
+    namespace: default
+  rules:
+  - backendRefs:
+    - group: gateway.envoyproxy.io
+      kind: Backend
+      name: active
+      namespace: default
+      port: 3000
+    - group: gateway.envoyproxy.io
+      kind: Backend
+      name: passive 
+      namespace: default
+      port: 3000
+    matches:
+    - path:
+        type: PathPrefix
+        value: /test
+```
+
+{{% /tab %}}
+{{< /tabpane >}}
+
+* Lets configure a `BackendTrafficPolicy` with a passive health check setting to detect an transient errors.
+
+{{< tabpane text=true >}}
+{{% tab header="Apply from stdin" %}}
+
+```shell
+cat <<EOF | kubectl apply -f -
+apiVersion: gateway.envoyproxy.io/v1alpha1
+kind: BackendTrafficPolicy
+metadata:
+  name: passive-health-check
+spec:
+  targetRefs:
+    - group: gateway.networking.k8s.io
+      kind: HTTPRoute
+      name: ha-example 
+  healthCheck:
+    passive:
+      baseEjectionTime: 10s
+      interval: 2s
+      maxEjectionPercent: 100
+      consecutive5XxErrors: 1 
+      consecutiveGatewayErrors: 0
+      consecutiveLocalOriginFailures: 1
+      splitExternalLocalOriginErrors: false
+EOF
+```
+
+{{% /tab %}}
+{{% tab header="Apply from file" %}}
+Save and apply the following resource to your cluster:
+
+```yaml
+---
+apiVersion: gateway.envoyproxy.io/v1alpha1
+kind: BackendTrafficPolicy
+metadata:
+  name: passive-health-check
+spec:
+  targetRefs:
+    - group: gateway.networking.k8s.io
+      kind: HTTPRoute
+      name: ha-example 
+  healthCheck:
+    passive:
+      baseEjectionTime: 10s
+      interval: 2s
+      maxEjectionPercent: 100
+      consecutive5XxErrors: 1 
+      consecutiveGatewayErrors: 0
+      consecutiveLocalOriginFailures: 1
+      splitExternalLocalOriginErrors: false
+```
+
+{{% /tab %}}
+{{< /tabpane >}}
+
+
+
+* Lets send 10 requests. You should see that they all go to the `active` backend.
+
+```shell
+for i in {1..10; do curl --verbose --header "Host: www.example.com" http://$GATEWAY_HOST/test 2>/dev/null | jq .pod; done
+```
+
+```console
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+"active-5bb896774f-lz8s9"
+```
+
+* Lets simulate a failure in the `active` backend by changing the server listening port to `5000`
+
+{{< tabpane text=true >}}
+{{% tab header="Apply from stdin" %}}
+
+```shell
+cat <<EOF | kubectl apply -f -
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: active
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: active
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: active
+        version: v1
+    spec:
+      containers:
+        - image: gcr.io/k8s-staging-gateway-api/echo-basic:v20231214-v1.0.0-140-gf544a46e
+          imagePullPolicy: IfNotPresent
+          name: active 
+          ports:
+            - containerPort: 3000
+          env:
+            - name: HTTP_PORT
+              value: "5000"
+            - name: POD_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
+            - name: NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
+EOF
+```
+
+{{% /tab %}}
+{{% tab header="Apply from file" %}}
+Save and apply the following resource to your cluster:
+
+```yaml
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: active
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: active
+      version: v1
+  template:
+    metadata:
+      labels:
+        app: active
+        version: v1
+    spec:
+      containers:
+        - image: gcr.io/k8s-staging-gateway-api/echo-basic:v20231214-v1.0.0-140-gf544a46e
+          imagePullPolicy: IfNotPresent
+          name: active 
+          ports:
+            - containerPort: 3000
+          env:
+            - name: HTTP_PORT
+              value: "5000"
+            - name: POD_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
+            - name: NAMESPACE
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
+```
+
+{{% /tab %}}
+{{< /tabpane >}}
+
+* Lets send 10 requests again. You should see them all being sent to the `passive` backend
+
+```shell
+for i in {1..10; do curl --verbose --header "Host: www.example.com" http://$GATEWAY_HOST/test 2>/dev/null | jq .pod; done
+```
+
+```console
+parse error: Invalid numeric literal at line 1, column 9
+"passive-7ddbf945c9-wkc4f"
+"passive-7ddbf945c9-wkc4f"
+"passive-7ddbf945c9-wkc4f"
+"passive-7ddbf945c9-wkc4f"
+"passive-7ddbf945c9-wkc4f"
+"passive-7ddbf945c9-wkc4f"
+"passive-7ddbf945c9-wkc4f"
+"passive-7ddbf945c9-wkc4f"
+"passive-7ddbf945c9-wkc4f"
+```
+
+The first error can be avoided by configuring [retries](./../../tasks/traffic/retry.md).