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Fabian Reinartz
2016-11-02 21:20:28 -07:00
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README.md
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@@ -1,8 +1,8 @@
# kube-prometheus # kube-prometheus
This repository collects Kubernetes manifests, dashboards, and alerting rules This repository collects Kubernetes manifests, dashboards, and alerting rules
combined with documentation and scripts to deploy them to get a full cluster combined with documentation and scripts to provide single-command deployments
monitoring setup working. of end-to-end Kubernetes cluster monitoring.
## Prerequisites ## Prerequisites
@@ -12,13 +12,92 @@ instructions of [bootkube](https://github.com/kubernetes-incubator/bootkube) or
repository are adapted to work with a [multi-node setup](https://github.com/kubernetes-incubator/bootkube/tree/master/hack/multi-node) repository are adapted to work with a [multi-node setup](https://github.com/kubernetes-incubator/bootkube/tree/master/hack/multi-node)
using [bootkube](https://github.com/kubernetes-incubator/bootkube). using [bootkube](https://github.com/kubernetes-incubator/bootkube).
Prometheus discovers targets via Kubernetes endpoints objects, which are automatically ## Monitoring Kubernetes
populated by Kubernetes services. Therefore Prometheus can
automatically find and pick up all services within a cluster. By The manifests used here use the [Prometheus Operator](https://github.com/coreos/prometheus-operator),
default there is a service for the Kubernetes API server. For other Kubernetes which manages Prometheus servers and their configuration in a cluster. With a single command we can install
core components to be monitored, headless services must be setup for them to be
discovered by Prometheus as they may be deployed differently depending * The Operator itself
on the cluster. * The Prometheus [node_exporter](https://github.com/prometheus/node_exporter)
* [kube-state-metrics](https://github.com/kubernetes/kube-state-metrics)
* The [Prometheus specification](https://github.com/coreos/prometheus-operator/blob/master/Documentation/prometheus.md) based on which the Operator deploys a Prometheus setup
* A Prometheus configuration covering monitoring of all Kubernetes core components and exporters
* A default set of alerting rules on the cluster component's health
* A Grafana instance serving dashboards on cluster metrics
Simply run:
```bash
export KUBECONFIG=<path> # defaults to "~/.kube/config"
hack/cluster-monitoring/deploy
```
After all pods are ready, you can reach:
* Prometheus UI on node port `30900`
* Grafana on node port `30902`
To tear it all down again, run:
```bash
hack/cluster-monitoring/teardown
```
> All services in the manifest still contain the `prometheus.io/scrape = true`
> annotations. It is not used by the Prometheus Operator. They remain for
> pre Prometheus v1.3.0 deployments as in [this example configuration](https://github.com/prometheus/prometheus/blob/6703404cb431f57ca4c5097bc2762438d3c1968e/documentation/examples/prometheus-kubernetes.yml).
## Monitoring custom services
The example manifests in [/manifests/examples/example-app](/manifests/examples/example-app)
deploy a fake service exposing Prometheus metrics. They additionally define a new Prometheus
server and a [`ServiceMonitor`](https://github.com/coreos/prometheus-operator/blob/master/Documentation/service-monitor.md),
which specifies how the example service should be monitored.
The Prometheus Operator will deploy and configure the desired Prometheus instance and continiously
manage its life cycle.
```bash
hack/example-service-monitoring/deploy
```
After all pods are ready you can reach the Prometheus server on node port `30100` and observe
how it monitors the service as specified.
Teardown:
```bash
hack/example-service-monitoring/teardown
```
## Dashboarding
The provided manifests deploy a Grafana instance serving dashboards provided via a ConfigMap.
To modify, delete, or add dashboards, the `grafana-dashboards` ConfigMap must be modified.
Currently, Grafana does not support serving dashboards from static files. Instead, the `grafana-watcher`
sidecar container aims to emulate the behavior, by keeping the Grafana database always in sync
with the provided ConfigMap. Hence, the Grafana pod is effectively stateless.
This allows managing dashboards via `git` etc. and easily deploying them via CD pipelines.
In the future, a separate Grafana opeartor will support gathering dashboards from multiple
ConfigMaps based on label selection.
## Roadmap
* Alertmanager Operator automatically handling HA clusters
* Grafana Operator that dynamically discovers and deploys dashboards from ConfigMaps
* KPM/Helm packages to easily provide production-ready cluster-monitoring setup (essentially contents of `hack/cluster-monitoring`)
* Add meta-monitoring to default cluster monitoring setup
* Build out the provided dashboards and alerts for cluster monitoring to have full coverage of all system aspects
## Monitoring other Cluster Components
Discovery of API servers and kubelets works the same across all clusters.
Depending on a cluster's setup several other core components, such as etcd or the
scheduler, may be deployed in different ways.
The easiest integration point is for the cluster operator to provide headless services
of all those components to provide a common interface of discovering them. With that
setup they will automatically be discovered by the provided Prometheus configuration.
For the `kube-scheduler` and `kube-controller-manager` there are headless For the `kube-scheduler` and `kube-controller-manager` there are headless
services prepared, simply add them to your running cluster: services prepared, simply add them to your running cluster:
@@ -44,14 +123,8 @@ An example for bootkube's multi-node vagrant setup is [here](/manifests/etcd/etc
> Hint: this is merely an example for a local setup. The addresses will have to > Hint: this is merely an example for a local setup. The addresses will have to
> be adapted for a setup, that is not a single etcd bootkube created cluster. > be adapted for a setup, that is not a single etcd bootkube created cluster.
Before you continue, you should have endpoints objects for: With that setup the headless services provide endpoint lists consumed by
Prometheus to discover the endpoints as targets:
* `apiserver` (called `kubernetes` here)
* `kube-controller-manager`
* `kube-scheduler`
* `etcd` (called `etcd-k8s` to make clear this is the etcd used by kubernetes)
For example:
```bash ```bash
$ kubectl get endpoints --all-namespaces $ kubectl get endpoints --all-namespaces
@@ -60,75 +133,4 @@ default kubernetes 172.17.4.101:443
kube-system kube-controller-manager-prometheus-discovery 10.2.30.2:10252 1h kube-system kube-controller-manager-prometheus-discovery 10.2.30.2:10252 1h
kube-system kube-scheduler-prometheus-discovery 10.2.30.4:10251 1h kube-system kube-scheduler-prometheus-discovery 10.2.30.4:10251 1h
monitoring etcd-k8s 172.17.4.51:2379 1h monitoring etcd-k8s 172.17.4.51:2379 1h
``` ```
## Monitoring Kubernetes
The manifests used here use the [Prometheus Operator](https://github.com/coreos/prometheus-operator),
which manages Prometheus servers and their configuration in your cluster. To install the
controller, the [node_exporter](https://github.com/prometheus/node_exporter),
[Grafana](https://grafana.org) including default dashboards, and the Prometheus server, run:
```bash
export KUBECONFIG=<path> # defaults to "~/.kube/config"
hack/cluster-monitoring/deploy
```
After all pods are ready, you can reach:
* Prometheus UI on node port `30900`
* Grafana on node port `30902`
To tear it all down again, run:
```bash
hack/cluster-monitoring/teardown
```
> All services in the manifest still contain the `prometheus.io/scrape = true`
> annotations. It is not used by the Prometheus controller. They remain for
> pre Prometheus v1.3.0 deployments as in [this example configuration](https://github.com/prometheus/prometheus/blob/6703404cb431f57ca4c5097bc2762438d3c1968e/documentation/examples/prometheus-kubernetes.yml).
## Monitoring custom services
The example manifests in [/manifests/examples/example-app](/manifests/examples/example-app)
deploy a fake service into the `production` and `development` namespaces and define
a Prometheus server monitoring them.
```bash
kubectl --kubeconfig="$KUBECONFIG" create namespace production
kubectl --kubeconfig="$KUBECONFIG" create namespace development
hack/example-service-monitoring/deploy
```
After all pods are ready you can reach the Prometheus server monitoring your services
on node port `30100`.
Teardown:
```bash
hack/example-service-monitoring/teardown
```
## Dashboarding
The provided manifests deploy a Grafana instance serving dashboards provided via a ConfigMap.
To modify, delete, or add dashboards, the `grafana-dashboards` ConfigMap must be modified.
Currently, Grafana does not support serving dashboards from static files. Instead, the `grafana-watcher`
sidecar container aims to emulate the behavior, by keeping the Grafana database always in sync
with the provided ConfigMap. Hence, the Grafana pod is effectively stateless.
This allows managing dashboards via `git` etc. and easily deploying them via CD pipelines.
In the future, a separate Grafana controller should support gathering dashboards from multiple
ConfigMaps, which are selected by their labels.
Prometheus servers deployed by the Prometheus controller should be automatically added as
Grafana data sources.
## Roadmap
* Incorporate [Alertmanager controller](https://github.com/coreos/kube-alertmanager-controller)
* Grafana controller that dynamically discovers and deploys dashboards from ConfigMaps
* KPM/Helm packages to easily provide production-ready cluster-monitoring setup (essentially contents of `hack/cluster-monitoring`)
* Add meta-monitoring to default cluster monitoring setup

3
manifests/prometheus/prometheus-k8s.yaml
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@@ -4,4 +4,5 @@ metadata:
name: prometheus-k8s name: prometheus-k8s
labels: labels:
prometheus: k8s prometheus: k8s
spec: {} spec:
version: v1.3.0