Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.
Quickstart: instrument a C/C++ service with Beyla
1. Run an instrumentable C/C++ service
Run an instrumentable C/C++ service or download and run a simple example C++ HTTP service.
curl -OL https://raw.githubusercontent.com/grafana/beyla/main/examples/quickstart/cpp/httplib.h
curl -OL https://raw.githubusercontent.com/grafana/beyla/main/examples/quickstart/cpp/quickstart.cpp
g++ -std=c++11 quickstart.cpp -o quickstart && ./quickstart
If necessary, replace the g++
command by another compiler supporting C++11.
2. Download Beyla
Download the latest Beyla executable from the Beyla releases page. Uncompress and copy the Beyla executable to any location in your $PATH
.
3. (Optional) get Grafana Cloud credentials
Beyla can export metrics and traces to any OpenTelemetry endpoint, as well as exposing metrics as a Prometheus endpoint. However, we recommend using the OpenTelemetry endpoint in Grafana Cloud. You can get a Free Grafana Cloud Account at Grafana’s website.
From the Grafana Cloud Portal, look for the OpenTelemetry box and click Configure.
Under Password / API token click Generate now and follow the instructions to create a default API token.
The Environment Variables will be populated with a set of standard OpenTelemetry environment variables which will provide the connection endpoint and credentials information for Beyla.
Copy the Environment Variables and keep it for the next step.
4. Run Beyla with minimal configuration
To run Beyla, first set the following environment variables:
- The
OTEL_EXPORTER_OTLP_PROTOCOL
,OTEL_EXPORTER_OTLP_ENDPOINT
andOTEL_EXPORTER_OTLP_HEADERS
variables copied from the previous step. BEYLA_OPEN_PORT
: the port the instrumented service is using (for example,80
or443
). If using the example service in the first section of this guide, set this variable to8080
.
To facilitate local testing, set the BEYLA_PRINT_TRACES=true
environment variable. This will cause Beyla to print traces to standard output.
Notice: Beyla requires administrative (sudo) privileges, or at least it needs to be granted the CAP_SYS_ADMIN
capability.
export BEYLA_OPEN_PORT=8080
export BEYLA_PRINT_TRACES=true
export OTEL_EXPORTER_OTLP_PROTOCOL="http/protobuf"
export OTEL_EXPORTER_OTLP_ENDPOINT="https://otlp-gateway-prod-eu-west-0.grafana.net/otlp"
export OTEL_EXPORTER_OTLP_HEADERS="Authorization=Basic ...your-encoded-credentials..."
sudo -E beyla
5. Test the service
With Beyla and the service running, make HTTP requests to the instrumented service:
curl http://localhost:8080/foo
Beyla should output traces to the standard output similar to this:
2024-01-09 10:31:33.19103133 (3.254486ms[3.254486ms]) 200 GET /foo [127.0.0.1]->[127.0.0.1:8080]
size:80B svc=[{quickstart generic lima-ubuntu-lts-5074}] traceparent=[00-46214bd23716280eef43cf798dbe5522-0000000000000000-01]
The above trace shows:
2024-01-09 10:31:33.19103133
: time of the trace(3.254486ms[3.254486ms])
: total response time for the request200 GET /foo
: response code, HTTP method, and URL path[127.0.0.1]->[127.0.0.1:8080]
source and destinationhost:port
size:80B
: size of the HTTP request (sum of the headers and the body)svc=[{quickstart generic lima-ubuntu-lts-5074}]
:quickstart
service, using the generic kernel-based instrumenter, with an automatically created service instance namelima-ubuntu-lts-5074
traceparent
as received by the parent request, or a new random one if the parent request didn’t specify it
After a few minutes traces will appear in Grafana Cloud. For example, in the traces explorer:
6. Configure routing
The exposed span name in Grafana Cloud is a generic GET /**
, where it should say something like GET /foo
(the path of the
test request URL).
Beyla groups any unknown URL path as /**
to avoid unexpected cardinality explosions.
Configure routing to tell Beyla about expected routes.
For this quickstart, let Beyla to heuristically group the routes.
First, create a config.yml
file with the following content:
routes:
unmatched: heuristic
Then, run Beyla with the -config
argument (or use the BEYLA_CONFIG_PATH
environment variable instead):
sudo -E beyla -config config.yml
Finally, make HTTP requests:
curl http://localhost:8080/foo
curl http://localhost:8080/user/1234
curl http://localhost:8080/user/5678
Grafana will now heuristically assign a route to each trace. /foo
got its own route while /user/1234
and
/user/5678
were grouped into the /user/*
route.
Next steps
- Get more details of the different Beyla configuration options.
- Learn how to deploy Beyla as a Docker container or as a Kubernetes DaemonSet or sidecar.