content/en/docs/tasks/observability/logs/otel-provider/index.md
The Envoy proxies can be configured to export their access logs in OpenTelemetry format.
In this example, the proxies send access logs to an OpenTelemetry collector, which is configured to print the logs to standard output.
The standard output of the OpenTelemetry collector can then be accessed via the kubectl logs command.
{{< boilerplate before-you-begin-egress >}}
{{< boilerplate start-httpbin-service >}}
{{< boilerplate start-otel-collector-service >}}
To enable access logging, use the Telemetry API.
Edit MeshConfig to add an OpenTelemetry provider, named otel. This involves adding an extension provider stanza:
{{< text yaml >}} extensionProviders:
The final configuration should look something like:
{{< text yaml >}} apiVersion: v1 kind: ConfigMap metadata: name: istio namespace: istio-system data: mesh: |- accessLogFile: /dev/stdout defaultConfig: discoveryAddress: istiod.istio-system.svc:15012 proxyMetadata: {} tracing: zipkin: address: zipkin.istio-system:9411 enablePrometheusMerge: true extensionProviders: - name: otel envoyOtelAls: service: opentelemetry-collector.observability.svc.cluster.local port: 4317 rootNamespace: istio-system trustDomain: cluster.local meshNetworks: 'networks: {}' {{< /text >}}
Next, add a Telemetry resource that tells Istio to send access logs to the OpenTelemetry collector.
{{< text bash >}} $ cat <<EOF | kubectl apply -n default -f - apiVersion: telemetry.istio.io/v1 kind: Telemetry metadata: name: curl-logging spec: selector: matchLabels: app: curl accessLogging: - providers: - name: otel EOF {{< /text >}}
The above example uses the otel access log provider, and we do not configure anything other than default settings.
Similar configuration can also be applied on an individual namespace, or to an individual workload, to control logging at a fine grained level.
For more information about using the Telemetry API, see the Telemetry API overview.
If you used an IstioOperator configuration to install Istio, add the following field to your configuration:
{{< text yaml >}} spec: meshConfig: accessLogFile: /dev/stdout extensionProviders: - name: otel envoyOtelAls: service: opentelemetry-collector.observability.svc.cluster.local port: 4317 defaultProviders: accessLogging: - envoy - otel {{< /text >}}
Otherwise, add the equivalent setting to your original istioctl install command, for example:
{{< text syntax=bash snip_id=none >}} $ istioctl install -f <your-istio-operator-config-file> {{< /text >}}
Istio will use the following default access log format if accessLogFormat is not specified:
{{< text plain >}} [%START_TIME%] "%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%" %RESPONSE_CODE% %RESPONSE_FLAGS% %RESPONSE_CODE_DETAILS% %CONNECTION_TERMINATION_DETAILS% "%UPSTREAM_TRANSPORT_FAILURE_REASON%" %BYTES_RECEIVED% %BYTES_SENT% %DURATION% %RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)% "%REQ(X-FORWARDED-FOR)%" "%REQ(USER-AGENT)%" "%REQ(X-REQUEST-ID)%" "%REQ(:AUTHORITY)%" "%UPSTREAM_HOST%" %UPSTREAM_CLUSTER% %UPSTREAM_LOCAL_ADDRESS% %DOWNSTREAM_LOCAL_ADDRESS% %DOWNSTREAM_REMOTE_ADDRESS% %REQUESTED_SERVER_NAME% %ROUTE_NAME%\n {{< /text >}}
The following table shows an example using the default access log format for a request sent from curl to httpbin:
| Log operator | access log in curl | access log in httpbin |
|---|---|---|
[%START_TIME%] | [2020-11-25T21:26:18.409Z] | [2020-11-25T21:26:18.409Z] |
\"%REQ(:METHOD)% %REQ(X-ENVOY-ORIGINAL-PATH?:PATH)% %PROTOCOL%\" | "GET /status/418 HTTP/1.1" | "GET /status/418 HTTP/1.1" |
%RESPONSE_CODE% | 418 | 418 |
%RESPONSE_FLAGS% | - | - |
%RESPONSE_CODE_DETAILS% | via_upstream | via_upstream |
%CONNECTION_TERMINATION_DETAILS% | - | - |
\"%UPSTREAM_TRANSPORT_FAILURE_REASON%\" | "-" | "-" |
%BYTES_RECEIVED% | 0 | 0 |
%BYTES_SENT% | 135 | 135 |
%DURATION% | 4 | 3 |
%RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)% | 4 | 1 |
\"%REQ(X-FORWARDED-FOR)%\" | "-" | "-" |
\"%REQ(USER-AGENT)%\" | "curl/7.73.0-DEV" | "curl/7.73.0-DEV" |
\"%REQ(X-REQUEST-ID)%\" | "84961386-6d84-929d-98bd-c5aee93b5c88" | "84961386-6d84-929d-98bd-c5aee93b5c88" |
\"%REQ(:AUTHORITY)%\" | "httpbin:8000" | "httpbin:8000" |
\"%UPSTREAM_HOST%\" | "10.44.1.27:80" | "127.0.0.1:80" |
%UPSTREAM_CLUSTER% | <code>outbound|8000||httpbin.foo.svc.cluster.local</code> | <code>inbound|8000||</code> |
%UPSTREAM_LOCAL_ADDRESS% | 10.44.1.23:37652 | 127.0.0.1:41854 |
%DOWNSTREAM_LOCAL_ADDRESS% | 10.0.45.184:8000 | 10.44.1.27:80 |
%DOWNSTREAM_REMOTE_ADDRESS% | 10.44.1.23:46520 | 10.44.1.23:37652 |
%REQUESTED_SERVER_NAME% | - | outbound_.8000_._.httpbin.foo.svc.cluster.local |
%ROUTE_NAME% | default | default |
Send a request from curl to httpbin:
{{< text bash >}} $ kubectl exec "$SOURCE_POD" -c curl -- curl -sS -v httpbin:8000/status/418 ... < HTTP/1.1 418 Unknown ... < server: envoy ... I'm a teapot! ... {{< /text >}}
Check otel-collector's log:
{{< text bash >}} $ kubectl logs -l app=opentelemetry-collector -n observability [2020-11-25T21:26:18.409Z] "GET /status/418 HTTP/1.1" 418 - via_upstream - "-" 0 135 3 1 "-" "curl/7.73.0-DEV" "84961386-6d84-929d-98bd-c5aee93b5c88" "httpbin:8000" "127.0.0.1:80" inbound|8000|| 127.0.0.1:41854 10.44.1.27:80 10.44.1.23:37652 outbound_.8000_._.httpbin.foo.svc.cluster.local default {{< /text >}}
Note that the messages corresponding to the request appear in logs of the Istio proxies of both the source and the destination, curl and httpbin, respectively. You can see in the log the HTTP verb (GET), the HTTP path (/status/418), the response code (418) and other request-related information.
Shutdown the [curl]({{< github_tree >}}/samples/curl) and [httpbin]({{< github_tree >}}/samples/httpbin) services:
{{< text bash >}} $ kubectl delete telemetry curl-logging $ kubectl delete -f @samples/curl/curl.yaml@ $ kubectl delete -f @samples/httpbin/httpbin.yaml@ $ kubectl delete -f @samples/open-telemetry/otel.yaml@ -n istio-system $ kubectl delete namespace observability {{< /text >}}
Remove, or set to "", the meshConfig.extensionProviders and meshConfig.defaultProviders setting in your Istio install configuration.
{{< tip >}}
In the example below, replace default with the name of the profile you used when you installed Istio.
{{< /tip >}}
{{< text bash >}} $ istioctl install --set profile=default ✔ Istio core installed ✔ Istiod installed ✔ Ingress gateways installed ✔ Installation complete {{< /text >}}