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docs: Added documentation for limit stripping of containers

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Sayak Mukhopadhyay 2020-09-24 18:36:11 +05:30
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commit 3adc752839
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24
README.md
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@ -50,6 +50,7 @@ This stack is meant for cluster monitoring, so it is pre-configured to collect m
- [Monitoring all namespaces](#monitoring-all-namespaces)
- [Static etcd configuration](#static-etcd-configuration)
- [Pod Anti-Affinity](#pod-anti-affinity)
- [Stripping container resource limits](#stripping-container-resource-limits)
- [Customizing Prometheus alerting/recording rules and Grafana dashboards](#customizing-prometheus-alertingrecording-rules-and-grafana-dashboards)
- [Exposing Prometheus/Alermanager/Grafana via Ingress](#exposing-prometheusalermanagergrafana-via-ingress)
- [Minikube Example](#minikube-example)
@ -695,6 +696,29 @@ possible, one can include the [kube-prometheus-anti-affinity.libsonnet](jsonnet/
(import 'kube-prometheus/kube-prometheus-anti-affinity.libsonnet')
```
### Stripping container resource limits
Sometimes in small clusters, the CPU/memory limits can get high enough for alerts to be fired continuously. To prevent this, one can strip off the predefined limits.
To do that, one can import the following mixin
[embedmd]:# (examples/strip-limits.jsonnet)
```jsonnet
local kp = (import 'kube-prometheus/kube-prometheus.libsonnet') +
(import 'kube-prometheus/kube-prometheus-strip-limits.libsonnet') + {
_config+:: {
namespace: 'monitoring',
},
};
{ ['00namespace-' + name]: kp.kubePrometheus[name] for name in std.objectFields(kp.kubePrometheus) } +
{ ['0prometheus-operator-' + name]: kp.prometheusOperator[name] for name in std.objectFields(kp.prometheusOperator) } +
{ ['node-exporter-' + name]: kp.nodeExporter[name] for name in std.objectFields(kp.nodeExporter) } +
{ ['kube-state-metrics-' + name]: kp.kubeStateMetrics[name] for name in std.objectFields(kp.kubeStateMetrics) } +
{ ['alertmanager-' + name]: kp.alertmanager[name] for name in std.objectFields(kp.alertmanager) } +
{ ['prometheus-' + name]: kp.prometheus[name] for name in std.objectFields(kp.prometheus) } +
{ ['grafana-' + name]: kp.grafana[name] for name in std.objectFields(kp.grafana) }
```
### Customizing Prometheus alerting/recording rules and Grafana dashboards
See [developing Prometheus rules and Grafana dashboards](docs/developing-prometheus-rules-and-grafana-dashboards.md) guide.

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examples/strip-limits.jsonnet Normal file
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@ -0,0 +1,14 @@
local kp = (import 'kube-prometheus/kube-prometheus.libsonnet') +
(import 'kube-prometheus/kube-prometheus-strip-limits.libsonnet') + {
_config+:: {
namespace: 'monitoring',
},
};
{ ['00namespace-' + name]: kp.kubePrometheus[name] for name in std.objectFields(kp.kubePrometheus) } +
{ ['0prometheus-operator-' + name]: kp.prometheusOperator[name] for name in std.objectFields(kp.prometheusOperator) } +
{ ['node-exporter-' + name]: kp.nodeExporter[name] for name in std.objectFields(kp.nodeExporter) } +
{ ['kube-state-metrics-' + name]: kp.kubeStateMetrics[name] for name in std.objectFields(kp.kubeStateMetrics) } +
{ ['alertmanager-' + name]: kp.alertmanager[name] for name in std.objectFields(kp.alertmanager) } +
{ ['prometheus-' + name]: kp.prometheus[name] for name in std.objectFields(kp.prometheus) } +
{ ['grafana-' + name]: kp.grafana[name] for name in std.objectFields(kp.grafana) }