This guide demonstrates a client within the service mesh accessing destinations external to the mesh using OSM’s Egress capability to passthrough traffic to unknown destinations without an Egress policy.


  • Kubernetes cluster running Kubernetes v1.22.9 or greater.
  • Have OSM installed.
  • Have kubectl available to interact with the API server.
  • Have osm CLI available for managing the service mesh.

HTTP(S) mesh-wide Egress passthrough demo

  1. Enable global egress passthrough if not enabled:

    export osm_namespace=osm-system # Replace osm-system with the namespace where OSM is installed
    kubectl patch meshconfig osm-mesh-config -n "$osm_namespace" -p '{"spec":{"traffic":{"enableEgress":true}}}'  --type=merge
  2. Deploy the curl client into the curl namespace after enrolling its namespace to the mesh.

    # Create the curl namespace
    kubectl create namespace curl
    # Add the namespace to the mesh
    osm namespace add curl
    # Deploy curl client in the curl namespace
    kubectl apply -f -n curl

    Confirm the curl client pod is up and running.

    $ kubectl get pods -n curl
    NAME                    READY   STATUS    RESTARTS   AGE
    curl-54ccc6954c-9rlvp   2/2     Running   0          20s
  3. Confirm the curl client is able to make successful HTTPS requests to the website on port 443.

    $ kubectl exec -n curl -ti "$(kubectl get pod -n curl -l app=curl -o jsonpath='{.items[0]}')" -c curl -- curl -I
    HTTP/2 200
    date: Tue, 16 Mar 2021 22:19:00 GMT
    content-type: text/html; charset=utf-8
    content-length: 9593
    server: gunicorn/19.9.0
    access-control-allow-origin: *
    access-control-allow-credentials: true

    A 200 OK response indicates the HTTPS request from the curl client to the website was successful.

  4. Confirm the HTTPS requests fail when mesh-wide egress is disabled.

    kubectl patch meshconfig osm-mesh-config -n "$osm_namespace" -p '{"spec":{"traffic":{"enableEgress":false}}}'  --type=merge
    $ kubectl exec -n curl -ti "$(kubectl get pod -n curl -l app=curl -o jsonpath='{.items[0]}')" -c curl -- curl -I
      curl: (7) Failed to connect to port 443 after 3 ms: Connection refused
      command terminated with exit code 7