Logging

Kf provides you with several types of logs. This document describes these logs and how to access them.

Application logs

All logs written to standard output stdout and standard error stderr, are uploaded to Cloud Logging and stored under the log name user-container.

Open Cloud Logging and run the following query:

resource.type="k8s_container"
log_name="projects/YOUR_PROJECT_ID/logs/user-container"
resource.labels.project_id=YOUR_PROJECT_ID
resource.labels.location=GCP_COMPUTE_ZONE (e.g. us-central1-a)
resource.labels.cluster_name=YOUR_CLUSTER_NAME
resource.labels.namespace_name=YOUR_KF_SPACE_NAME
resource.labels.pod_name:YOUR_KF_APP_NAME

You should see all your application logs written on standard stdout and standard error stderr.

Access logs for your applications

Kf provides access logs using Istio sidecar injection. Access logs are stored under the log name server-accesslog-stackdriver.

Open Cloud Logging and run the following query:

resource.type="k8s_container"
log_name="projects/YOUR_PROJECT_ID/logs/server-accesslog-stackdriver"
resource.labels.project_id=YOUR_PROJECT_ID
resource.labels.location=GCP_COMPUTE_ZONE (e.g. us-central1-a)
resource.labels.cluster_name=YOUR_CLUSTER_NAME
resource.labels.namespace_name=YOUR_KF_SPACE_NAME
resource.labels.pod_name:YOUR_KF_APP_NAME

You should see access logs for your application. Sample access log:

{
  "insertId": "166tsrsg273q5mf",
  "httpRequest": {
    "requestMethod": "GET",
    "requestUrl": "http://test-app-38n6dgwh9kx7h-c72edc13nkcm.***. ***.nip.io/",
    "requestSize": "738",
    "status": 200,
    "responseSize": "3353",
    "remoteIp": "10.128.0.54:0",
    "serverIp": "10.48.0.18:8080",
    "latency": "0.000723777s",
    "protocol": "http"
  },
  "resource": {
    "type": "k8s_container",
    "labels": {
      "container_name": "user-container",
      "project_id": ***,
      "namespace_name": ***,
      "pod_name": "test-app-85888b9796-bqg7b",
      "location": "us-central1-a",
      "cluster_name": ***
    }
  },
  "timestamp": "2020-11-19T20:09:21.721815Z",
  "severity": "INFO",
  "labels": {
    "source_canonical_service": "istio-ingressgateway",
    "source_principal": "spiffe://***.svc.id.goog/ns/istio-system/sa/istio-ingressgateway-service-account",
    "request_id": "0e3bac08-ab68-408f-9b14-0aec671845bf",
    "source_app": "istio-ingressgateway",
    "response_flag": "-",
    "route_name": "default",
    "upstream_cluster": "inbound|80|http-user-port|test-app.***.svc.cluster.local",
    "destination_name": "test-app-85888b9796-bqg7b",
    "destination_canonical_revision": "latest",
    "destination_principal": "spiffe://***.svc.id.goog/ns/***/sa/sa-test-app",
    "connection_id": "82261",
    "destination_workload": "test-app",
    "destination_namespace": ***,
    "destination_canonical_service": "test-app",
    "upstream_host": "127.0.0.1:8080",
    "log_sampled": "false",
    "mesh_uid": "proj-228179605852",
    "source_namespace": "istio-system",
    "requested_server_name": "outbound_.80_._.test-app.***.svc.cluster.local",
    "source_canonical_revision": "asm-173-6",
    "x-envoy-original-dst-host": "",
    "destination_service_host": "test-app.***.svc.cluster.local",
    "source_name": "istio-ingressgateway-5469f77856-4n2pw",
    "source_workload": "istio-ingressgateway",
    "x-envoy-original-path": "",
    "service_authentication_policy": "MUTUAL_TLS",
    "protocol": "http"
  },
  "logName": "projects/*/logs/server-accesslog-stackdriver",
  "receiveTimestamp": "2020-11-19T20:09:24.627065813Z"
}

Audit logs

Audit Logs provides a chronological record of calls that have been made to the Kubernetes API Server. Kubernetes audit log entries are useful for investigating suspicious API requests, for collecting statistics, or for creating monitoring alerts for unwanted API calls.

Open Cloud Logging and run the following query:

resource.type="k8s_container"
log_name="projects/YOUR_PROJECT_ID/logs/cloudaudit.googleapis.com%2Factivity"
resource.labels.project_id=YOUR_PROJECT_ID
resource.labels.location=GCP_COMPUTE_ZONE (e.g. us-central1-a)
resource.labels.cluster_name=YOUR_CLUSTER_NAME
protoPayload.request.metadata.name=YOUR_APP_NAME
protoPayload.methodName:"deployments."

You should see a trace of calls being made to the Kubernetes API server.

Logging Access control

Follow the instructions here to provide logs access to developers and other members on the team. The role roles/logging.viewer provides read-only access to logs.

Logs Router

You can also use Logs Router to route the logs to supported destinations.