In addition to these trace and span IDs, the Gorouter access log message for the request includes x_b3_parentspanid.A “router on a stick” (aka “one-armed router”) is a network configuration in which a single network switch is connected to a single LAN interface on a router. If the X-B3-TraceId and X-B3-SpanId HTTP headers are present in the request, the Gorouter forwards them unmodified.These values are also found in the Gorouter access log message for the request: x_b3_traceid and x_b3_spanid. If the X-B3-TraceId and X-B3-SpanId HTTP headers are not present in the request, the Gorouter generates values for these and inserts the headers into the request forwarded to an app.When Zipkin tracing is enabled in Cloud Foundry, the Gorouter examines the HTTP request headers and performs: Zipkin provides the ability to trace requests and responses across distributed systems. Zipkin is a tracing system that enables app developers to troubleshoot failures or latency issues. For more information, see Securing Traffic into Cloud Foundry. If your load balancer terminates TLS on the client side of the Gorouter, it must append these headers to requests forwarded to the Gorouter. If a load balancer sends the client IP using the PROXY protocol, then the Gorouter uses the client IP address to set X-Forwarded-For. If X-Forwarded-For is not present, then the Gorouter sets it to the IP address of the load balancer in the forwarded request (some load balancers masquerade the client IP). If X-Forwarded-For is present, the Gorouter appends the load balancer’s IP address to it and forwards the list.
The header may have multiple values represented as a comma-separated list, so developers must ensure the app rejects traffic that includes any X-Forwarded-Proto values that are not HTTPS.
#Responsibility of router on a stick Offline#
Service-Specific Instructions for Streaming App Logs.Streaming App Logs to Log Management Services.Using an External File System (Volume Services).Configuring Play Framework Service Connections.Delivering Service Credentials to an App.Routing HTTP/2 and gRPC Traffic to Apps.Configuring CF to Route Traffic to Apps on Custom Ports.Troubleshooting App Deployment and Health.Using Blue-Green Deployment to Reduce Downtime and Risk.Starting, Restarting, and Restaging Apps.Deploying a Nozzle to the Loggregator Firehose.Installing the Loggregator Plugin for cf CLI.Monitoring and Testing Diego Components.Configuring Health Monitor Notifications.Configuring Diego Cell Disk Cleanup Scheduling.Configuring SSH Access for Cloud Foundry.Running and Troubleshooting Cloud Foundry.Configuring Load Balancer Health Checks for CF Routers.Getting Started with the Notifications Service.
Creating and Managing Users with the UAA CLI (UAAC).Creating and Managing Users with the cf CLI.Cloud Controller Blobstore Configuration.Backup and Restore for External Blobstores.Configuring Your Cloud Foundry for BOSH Backup and Restore.Migrating from cf-release to cf-deployment.Deploying Cloud Foundry with cf-deployment.Using the cf CLI with a Self-Signed Certificate.Cloud Foundry Command Line Interface (cf CLI).User Account and Authentication (UAA) Server.How Cloud Foundry Maintains High Availability.