TNS Observability Demo
A simple three-tier demo application, fully instrumented with Prometheus, OpenTracing and Go-kit logging.
The "TNS" name comes from "The New Stack", where the original demo code was used for an article.
Instructions
- Build:
$ make- Run:
$ kubectl apply -f ./production/k8s-yamls- Monitoring with Prometheus
Requires tanka and a recent version of jsonnet-bundler:
$ GO111MODULE=on go get github.com/grafana/tanka/cmd/[email protected]
$ go get github.com/jsonnet-bundler/jsonnet-bundler/cmd/jb$ mkdir tanka; cd tanka
$ tk init
$ tk env set environments/default --server=https://kubernetes.docker.internal:6443 # if you're using docker desktop.
$ jb install github.com/grafana/jsonnet-libs/prometheus-ksonnet
$ curl https://raw.githubusercontent.com/ksonnet/ksonnet-lib/master/ksonnet.beta.3/k8s.libsonnet > vendor/k8s.libsonnet
$ curl https://raw.githubusercontent.com/ksonnet/ksonnet-lib/master/ksonnet.beta.3/k.libsonnet > vendor/k.libsonnetUpdate environments/default/main.jsonnet to be:
local prometheus = import "prometheus-ksonnet/prometheus-ksonnet.libsonnet";
prometheus {
local service = $.core.v1.service,
_config+:: {
namespace: "default",
cluster_name: "docker",
},
_images+:: {
grafana: "grafana/grafana-dev:explore-trace-ui-demo-c8434d13350e0f43c3937ff37ce8932310ac7fd9-ubuntu",
},
prometheus_service+: $.prometheus {
name: "prometheus",
prometheus_container+::
$.util.resourcesRequests('250m', '500Mi'),
},
// Expose the nginx admin frontend on port 30040 of the node.
nginx_service+:
service.mixin.spec.withType("NodePort") +
service.mixin.spec.withPorts({
nodePort: 30040,
port: 8080,
targetPort: 80,
}),
}
Apply:
$ tk apply environments/defaultThen go to http://localhost:30040/ to see the monitoring stack.
3b. Add dashboards for demo app
$ jb install https://github.com/grafana/tns/production/tns-mixin/Update environments/default/main.jsonnet to be:
local prometheus = import "prometheus-ksonnet/prometheus-ksonnet.libsonnet";
local mixin = import "tns-mixin/mixin.libsonnet";
prometheus + mixin {
...
$ tk apply environments/default- Log Aggregation with Grafana Loki
$ helm init
$ helm repo add loki https://grafana.github.io/loki/charts
$ helm repo update
$ helm upgrade --install loki loki/loki-stackAdd a Loki datasource to Grafana, pointing at http://loki.default.svc.cluster.local:3100.
- Install Jaeger
$ kubectl apply -f ./production/jaeger(The app is already configured to send traces to jaeger.)
- Setup The Trace Demo
Override the Grafana Image by adding the following to your main.jsonnet and run tk apply.
_images+:: {
grafana: "grafana/grafana-dev:explore-trace-ui-demo-b56f2a8ae23d399f6e170f439c058f4bdb08f0da-ubuntu",
},
Add a Jaeger datasource:
- URL: http://localhost:31686
- Access: Browser
Navigate to the Loki datasource and add a derived field:
- Name: traceID
- Regex: traceID=(\w+)
- URL: http://localhost:31686/trace/${__value.raw}?uiEmbed=v0
- Internal Link: Jaeger
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