Uploaded image for project: 'Managed Service - API'
  1. Managed Service - API
  2. MGDAPI-6186

APIcast sometimes selects wrong backend

XMLWordPrintable

    • False
    • False
    • No
    • Hide

      Disable TLS Termination in APIcast
      OR
      Disable keepalive by configuring HTTP_KEEPALIVE_TIMEOUT=0 in APIcast

      Show
      Disable TLS Termination in APIcast OR Disable keepalive by configuring HTTP_KEEPALIVE_TIMEOUT=0 in APIcast
    • Hide
      1. Download and extract reproducing_env.tar.gz
      2. Start APIcast with ./start_apicast_keepalive_routing_policy.sh
      3. Execute the script that fires multiple requests from the same session to the two paths configured, with: python fire_requests.py
      4. This will produce logs similar to those found in logs/logs_script_routing_policy.log where the problem is visible
      Show
      Download and extract reproducing_env.tar.gz Start APIcast with ./start_apicast_keepalive_routing_policy.sh Execute the script that fires multiple requests from the same session to the two paths configured, with: python fire_requests.py This will produce logs similar to those found in logs/logs_script_routing_policy.log where the problem is visible
    • +

      APIcast routes requests to the wrong backend.

      This happens when backends use the same host for the same service(product). So if a product has two backends

      A request e.g.  'POST https://{backend-host}/c ' can be routed incorrectly to backend 1 as 'POST https://{backend-host}//a/b/c'  instead of being routed to backend 2.  So the request fails.

      Notes:

      • The apicast log statement "Rule matched <url>" shows the wrong the backend being selected.
      • keepalive connection is used . HTTPS is used from both client  to  APIcast and from APICast to backend .

      This can be reproduced when:

      1. APIcast is configured to terminate TLS (either with environment variables, or with the tls termination policy)
      2. A client is configured to reuse the open TCP connection
      3. Multiple requests are sent from the client targeting different Backends configured each on its own path, on the same product

              Unassigned Unassigned
              rhn-support-cvajjhal Chandrasekhar Vajjhala (Inactive)
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

                Created:
                Updated:
                Resolved: