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kubernetes-k8s-netdata.md
# Kubernetes monitoring with Netdata This document gives an overview of what visualizations Netdata provides on Kubernetes deployments. At Netdata, we've built Kubernetes monitoring tools that add visibility without complexity while also helping you actively troubleshoot anomalies or outages. This guide walks you through each of the visualizations and offers best practices on how to use them to start Kubernetes monitoring in a matter of minutes, not hours or days. Netdata's Kubernetes monitoring solution uses a handful of [complementary tools and collectors](#related-reference-documentation) for peeling back the many complex layers of a Kubernetes cluster, _entirely for free_. These methods work together to give you every metric you need to troubleshoot performance or availability issues across your Kubernetes infrastructure. ## Challenge While Kubernetes (k8s) might simplify the way you deploy, scale, and load-balance your applications, not all clusters come with "batteries included" when it comes to monitoring. Doubly so for a monitoring stack that helps you actively troubleshoot issues with your cluster. Some k8s providers, like GKE (Google Kubernetes Engine), do deploy clusters bundled with monitoring capabilities, such as Google Stackdriver Monitoring. However, these pre-configured solutions might not offer the depth of metrics, customization, or integration with your preferred alerting methods. Without this visibility, it's like you built an entire house and _then_ smashed your way through the finished walls to add windows. ## Solution In this tutorial, you'll learn how to navigate Netdata's Kubernetes monitoring features, using [robot-shop](https://github.com/instana/robot-shop) as an example deployment. Deploying robot-shop is purely optional. You can also follow along with your own Kubernetes deployment if you choose. While the metrics might be different, the navigation and best practices are the same for every cluster. ## What you need to get started To follow this tutorial, you need: - A free Netdata Cloud account. [Sign up](https://app.netdata.cloud/sign-up?cloudRoute=/spaces) if you don't have one already. - A working cluster running Kubernetes v1.9 or newer, with a Netdata deployment and connected parent/child nodes. See our [Kubernetes deployment process](https://github.com/netdata/netdata/blob/master/packaging/installer/methods/kubernetes.md) for details on deployment and conneting to Cloud. - The [`kubectl`](https://kubernetes.io/docs/reference/kubectl/overview/) command line tool, within [one minor version difference](https://kubernetes.io/docs/tasks/tools/install-kubectl/#before-you-begin) of your cluster, on an administrative system. - The [Helm package manager](https://helm.sh/) v3.0.0 or newer on the same administrative system. ### Install the `robot-shop` demo (optional) Begin by downloading the robot-shop code and using `helm` to create a new deployment. ```bash git clone git@github.com:instana/robot-shop.git cd robot-shop/K8s/helm kubectl create ns robot-shop helm install robot-shop --namespace robot-shop . ``` Running `kubectl get pods` shows both the Netdata and robot-shop deployments. ```bash kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE default netdata-child-29f9c 2/2 Running 0 10m default netdata-child-8xphf 2/2 Running 0 10m default netdata-child-jdvds 2/2 Running 0 11m default netdata-parent-554c755b7d-qzrx4 1/1 Running 0 11m kube-system aws-node-jnjv8 1/1 Running 0 17m kube-system aws-node-svzdb 1/1 Running 0 17m kube-system aws-node-ts6n2 1/1 Running 0 17m kube-system coredns-559b5db75d-f58hp 1/1 Running 0 22h kube-system coredns-559b5db75d-tkzj2 1/1 Running 0 22h kube-system kube-proxy-9p9cd 1/1 Running 0 17m kube-system kube-proxy-lt9ss 1/1 Running 0 17m kube-system kube-proxy-n75t9 1/1 Running 0 17m robot-shop cart-b4bbc8fff-t57js 1/1 Running 0 14m robot-shop catalogue-8b5f66c98-mr85z 1/1 Running 0 14m robot-shop dispatch-67d955c7d8-lnr44 1/1 Running 0 14m robot-shop mongodb-7f65d86c-dsslc 1/1 Running 0 14m robot-shop mysql-764c4c5fc7-kkbnf 1/1 Running 0 14m robot-shop payment-67c87cb7d-5krxv 1/1 Running 0 14m robot-shop rabbitmq-5bb66bb6c9-6xr5b 1/1 Running 0 14m robot-shop ratings-94fd9c75b-42wvh 1/1 Running 0 14m robot-shop redis-0 0/1 Pending 0 14m robot-shop shipping-7d69cb88b-w7hpj 1/1 Running 0 14m robot-shop user-79c445b44b-hwnm9 1/1 Running 0 14m robot-shop web-8bb887476-lkcjx 1/1 Running 0 14m ``` ## Explore Netdata's Kubernetes monitoring charts The Netdata Helm chart deploys and enables everything you need for monitoring Kubernetes on every layer. Once you deploy Netdata and connect your cluster's nodes, you're ready to check out the visualizations **with zero configuration**. To get started, [sign in](https://app.netdata.cloud/sign-in?cloudRoute=/spaces) to your Netdata Cloud account. Head over to the War Room you connected your cluster to, if not **General**. Netdata Cloud is already visualizing your Kubernetes metrics, streamed in real-time from each node, in the [Overview](https://github.com/netdata/netdata/blob/master/docs/cloud/visualize/overview.md):  Let's walk through monitoring each layer of a Kubernetes cluster using the Overview as our framework. ## Cluster and node metrics The gauges and time-series charts you see right away in the Overview show aggregated metrics from every node in your cluster. For example, the `apps.cpu` chart (in the **Applications** menu item), visualizes the CPU utilization of various applications/services running on each of the nodes in your cluster. The **X Nodes** dropdown shows which nodes contribute to the chart and links to jump a single-node dashboard for further investigation.  For example, the chart above shows a spike in the CPU utilization from `rabbitmq` every minute or so, along with a baseline CPU utilization of 10-15% across the cluster. Read about the [Overview](https://github.com/netdata/netdata/blob/master/docs/cloud/visualize/overview.md) and some best practices on [viewing an overview of your infrastructure](https://github.com/netdata/netdata/blob/master/docs/visualize/overview-infrastructure.md) for details on using composite charts to drill down into per-node performance metrics. ## Pod and container metrics Click on the **Kubernetes xxxxxxx...** section to jump down to Netdata Cloud's unique Kubernetes visualizations for view real-time resource utilization metrics from your Kubernetes pods and containers.  ### Health map The first visualization is the [health map](https://github.com/netdata/netdata/blob/master/docs/cloud/visualize/kubernetes.md#health-map), which places each container into its own box, then varies the intensity of their color to visualize the resource utilization. By default, the health map shows the **average CPU utilization as a percentage of the configured limit** for every container in your cluster.  Let's explore the most colorful box by hovering over it.  The **Context** tab shows `rabbitmq-5bb66bb6c9-6xr5b` as the container's image name, which means this container is running a [RabbitMQ](https://github.com/netdata/go.d.plugin/blob/master/modules/rabbitmq/README.md) workload. Click the **Metrics** tab to see real-time metrics from that container. Unsurprisingly, it shows a spike in CPU utilization at regular intervals.  ### Time-series charts Beneath the health map is a variety of time-series charts that help you visualize resource utilization over time, which is useful for targeted troubleshooting. The default is to display metrics grouped by the `k8s_namespace` label, which shows resource utilization based on your different namespaces.  Each composite chart has a [definition bar](https://github.com/netdata/netdata/blob/master/docs/cloud/visualize/overview.md#definition-bar) for complete customization. For example, grouping the top chart by `k8s_container_name` reveals new information.  ## Service metrics Netdata has a [service discovery plugin](https://github.com/netdata/agent-service-discovery), which discovers and creates configuration files for [compatible services](https://github.com/netdata/helmchart#service-discovery-and-supported-services) and any endpoints covered by our [generic Prometheus collector](https://github.com/netdata/go.d.plugin/blob/master/modules/prometheus/README.md). Netdata uses these files to collect metrics from any compatible application as they run _inside_ of a pod. Service discovery happens without manual intervention as pods are created, destroyed, or moved between nodes. Service metrics show up on the Overview as well, beneath the **Kubernetes** section, and are labeled according to the service in question. For example, the **RabbitMQ** section has numerous charts from the [`rabbitmq` collector](https://github.com/netdata/go.d.plugin/blob/master/modules/rabbitmq/README.md):  > The robot-shop cluster has more supported services, such as MySQL, which are not visible with zero configuration. This > is usually because of services running on non-default ports, using non-default names, or required passwords. Read up > on [configuring service discovery](https://github.com/netdata/netdata/blob/master/packaging/installer/methods/kubernetes.md#configure-service-discovery) to collect > more service metrics. Service metrics are essential to infrastructure monitoring, as they're the best indicator of the end-user experience, and key signals for troubleshooting anomalies or issues. ## Kubernetes components Netdata also automatically collects metrics from two essential Kubernetes processes. ### kubelet The **k8s kubelet** section visualizes metrics from the Kubernetes agent responsible for managing every pod on a given node. This also happens without any configuration thanks to the [kubelet collector](https://github.com/netdata/go.d.plugin/blob/master/modules/k8s_kubelet/README.md). Monitoring each node's kubelet can be invaluable when diagnosing issues with your Kubernetes cluster. For example, you can see if the number of running containers/pods has dropped, which could signal a fault or crash in a particular Kubernetes service or deployment (see `kubectl get services` or `kubectl get deployments` for more details). If the number of pods increases, it may be because of something more benign, like another team member scaling up a service with `kubectl scale`. You can also view charts for the Kubelet API server, the volume of runtime/Docker operations by type, configuration-related errors, and the actual vs. desired numbers of volumes, plus a lot more. ### kube-proxy The **k8s kube-proxy** section displays metrics about the network proxy that runs on each node in your Kubernetes cluster. kube-proxy lets pods communicate with each other and accept sessions from outside your cluster. Its metrics are collected by the [kube-proxy collector](https://github.com/netdata/go.d.plugin/blob/master/modules/k8s_kubeproxy/README.md). With Netdata, you can monitor how often your k8s proxies are syncing proxy rules between nodes. Dramatic changes in these figures could indicate an anomaly in your cluster that's worthy of further investigation. ## What's next? After reading this guide, you should now be able to monitor any Kubernetes cluster with Netdata, including nodes, pods, containers, services, and more. With the health map, time-series charts, and the ability to drill down into individual nodes, you can see hundreds of per-second metrics with zero configuration and less time remembering all the `kubectl` options. Netdata moves with your cluster, automatically picking up new nodes or services as your infrastructure scales. And it's entirely free for clusters of all sizes. ### Related reference documentation - [Netdata Helm chart](https://github.com/netdata/helmchart) - [Netdata service discovery](https://github.com/netdata/agent-service-discovery) - [Netdata Agent · `kubelet` collector](https://github.com/netdata/go.d.plugin/blob/master/modules/k8s_kubelet/README.md) - [Netdata Agent · `kube-proxy` collector](https://github.com/netdata/go.d.plugin/blob/master/modules/k8s_kubeproxy/README.md) - [Netdata Agent · `cgroups.plugin`](https://github.com/netdata/netdata/blob/master/collectors/cgroups.plugin/README.md)