What does Splunk Connect for Kubernetes do?
Splunk Connect for Kubernetes provides a way to import and search your Kubernetes logging, object, and metrics data in Splunk. Splunk is a proud contributor to Cloud Native Computing Foundation (CNCF) and Splunk Connect for Kubernetes utilizes and supports multiple CNCF components in the development of these tools to get data into Splunk.
- Splunk Enterprise 7.0 or later
- An HEC token. See the following topics for more information:
- You should be familiar with your Kubernetes configuration and know where your log info is collected in Kubernetes.
- You must have administrator access to your Kubernetes cluster.
- To install using Helm (recommended), make sure you are running Helm in your Kubernetes configuration. See https://github.com/kubernetes/helm
- Have a minimum of two Splunk indexes ready to collect the log data, one for both logs and Kubernetes objects, and one for metrics. You can also create separate indexes for logs and objects, in which case you will need three Splunk indexes.
Before you begin
Splunk Connect for Kubernetes supports installation using Helm. Ensure that you thoroughly read the Prerequisites and Installation and Deployment documentation before you start your deployment of Splunk Connect for Kubernetes.
Make sure you do the following before you install:
- Create a minimum of two Splunk indexes:
- one events index, which will handle logs and objects (you may also create two separate indexes for logs and objects).
- one metrics index. If you do not configure these indexes, Kubernetes Connect for Splunk uses the defaults created in your HEC token.
- Create a HEC token if you do not already have one. If you are installing the connector on Splunk Cloud, file a ticket with Splunk Customer Service and they will deploy the indexes for your environment and generate your HEC token.
Deploy with Helm
Helm, maintained by the CNCF, allows the Kubernetes administrator to install, upgrade, and manage the applications running in their Kubernetes clusters. For more information on how to use and configure Helm Charts, please the the Helm site and repository for tutorials and product documentation. Helm is the only method that Splunk supports for installing Splunk Connect for Kubernetes.
To install and configure defaults with Helm:
$ helm install --name my-release -f my_values.yaml https://github.com/splunk/splunk-connect-for-kubernetes/releases/download/v1.0.1/splunk-connect-for-kubernetes-1.0.1.tgz
To learn more about using and modifying charts, see:
Configuration variables for Helm
To learn more about using and modifying charts, see:
Deploy using YAML
You can grab the manifest YAML files and use them to create the Kubernetes objects needed to deploy Splunk Connect for Kubernetes. Please note that installation and debugging for Splunk Connect for Kubernetes through YAML is community-supported only.
When you use YAML to deploy Splunk Connect for Kubernetes, the installation does not create the default configuration that is created when you install using Helm. To deploy the connector using YAML, you must know how to configure your Kubernetes variables to work with the connector. If you are not familiar with this process, we recommend that you use the Helm installation method.
To configure the Splunk Connector for Kubernetes using YAML files:
Grab the Charts and Manifest files from https://github.com/splunk/splunk-connect-for-kubernetes
Read through all YAML files in the Manifests folder and make any necessary changes. Note that the YAML files in the Manifests folder are examples and are not expected to be used as provided.
Verify that your Kubernetes logs are recognized by the Splunk Connect for Kubernetes.
Splunk Connect for Kubernetes deploys a daemonset on each node. And in the daemonset, a Fluentd container runs and does the collecting job. Splunk Connector for Kubernetes collects three types of data:
- logs: Splunk Connectr for Kubernetes collects two types of logs:
- logs from Kubernetes system components (https://kubernetes.io/docs/concepts/overview/components/)
- applications (container) logs
To collect the data, Splunk leverages:
- JQ plugin for transforming data
- Splunk HEC output plug-in: The HTTP Event Collector collects all data sent to Splunk for indexing.
- For Splunk Connect for Kubernetes, Splunk uses the node logging agent method. See the Kubernetes Logging Architecture for an overview of the types of Kubernetes logs from which you may wish to collect data as well as information on how to set up those logs.
Splunk Connect for Kubernetes uses the Kubernetes node logging agent to collect logs. Splunk deploys a daemonset on each of these nodes. Each daemonset holds a Fluentd container to collect the data. The following plugins are enabled in that Fluentd container:
- in_systemd reads logs from systemd journal if systemd is available on the host.
- in_tail reads logs from file system.
- filter_jq_transformer transforms the raw events to a Splunk-friendly format and generates source and sourcetypes.
- out_splunk_hec sends the translated logs to Splunk indexes through the HTTP Event Collector input (HEC).
Splunk Connect for Kubernetes collects Kubernetes objects that can help users access cluster status. Splunk deploys code in the Kubernetes cluster that collects the object data. That deployment contains one pod that runs Fluentd which contains the following plugins to help push data to Splunk:
- in_kubernetes_objects collects object data by calling the Kubernetes API (by https://github.com/abonas/kubeclient). in-kubernetes-objects supports two modes:
- watch mode: the Kubernetes API sends new changes to the plugin. In this mode, only the changed data is collected.
- pull mode: the plugin queries the Kubernetes API periodically. In this mode, all data is collected.
- filter_jq_transformer transforms the raw data into a Splunk-friendly format and generates sources and sourcetypes.
- out_splunk_hec sends the data to Splunk via HTTP Event Collector input (HEC).
Splunk Connect for Kubernetes deploys code on the Kubernetes cluster. This deployment has exactly one pod, which runs two containers:
- Heapster collects metrics and sends them to the Fluentd sidecar via UDP in
- Fluentd, which receives metrics from Heapster using in_udp and transforms the metrics using filter_jq_transformer. filter_jq_transformer formats the data for Splunk ingestion: It makea sure the metrics have proper metric_name, dimensions, etc., and then sends the metrics to Splunk using out_splunk_hec.
Make sure your Splunk configuration has a metrics index that is able to receive the data. See Get started with metrics in the Splunk Enterprise documentaiton.
If you want to learn more about how metrics are monitored in a Kubernetes cluster, see Tools for Monitoring Compute, Storage, and Network Resources.
If you want to learn more about which metrics are collected and labels used with Splunk Connect for Kubernetes, view the metrics schema within the Heapster docs.
Some parameters used with Splunk Connect for Kubernetes can have an impact on overall performance of log ingestion, objects, or metrics. In general, the more filters that are added to one of the streams, the greater the preformance impact.
Splunk Connect for Kubernetes can exceed the default throughput of HEC. To best address capacity needs, Splunk recommends that you monitor the HEC throughput and back pressure on Splunk Connect for Kubernetes deployments and be prepared to add additional nodes as needed.
Processing Multi-Line Logs
One possible filter option is to enable the processing of multi-line events. This feature is currently experimental and considered to be community supported.