136 lines
5.2 KiB
Markdown
136 lines
5.2 KiB
Markdown
# Kubernetes Input Plugin
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This input plugin talks to the kubelet api using the `/stats/summary` endpoint to gather metrics about the running pods and containers for a single host. It is assumed that this plugin is running as part of a `daemonset` within a kubernetes installation. This means that telegraf is running on every node within the cluster. Therefore, you should configure this plugin to talk to its locally running kubelet.
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To find the ip address of the host you are running on you can issue a command like the following:
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```
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$ curl -s $API_URL/api/v1/namespaces/$POD_NAMESPACE/pods/$HOSTNAME --header "Authorization: Bearer $TOKEN" --insecure | jq -r '.status.hostIP'
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```
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In this case we used the downward API to pass in the `$POD_NAMESPACE` and `$HOSTNAME` is the hostname of the pod which is set by the kubernetes API.
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#### Series Cardinality Warning
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This plugin may produce a high number of series which, when not controlled
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for, will cause high load on your database. Use the following techniques to
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avoid cardinality issues:
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- Use [metric filtering][] options to exclude unneeded measurements and tags.
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- Write to a database with an appropriate [retention policy][].
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- Limit series cardinality in your database using the
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[max-series-per-database][] and [max-values-per-tag][] settings.
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- Consider using the [Time Series Index][tsi].
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- Monitor your databases [series cardinality][].
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- Consult the [InfluxDB documentation][influx-docs] for the most up-to-date techniques.
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### Configuration
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```toml
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[[inputs.kubernetes]]
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## URL for the kubelet
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url = "http://127.0.0.1:10255"
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## Use bearer token for authorization
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# bearer_token = /path/to/bearer/token
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## Set response_timeout (default 5 seconds)
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# response_timeout = "5s"
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## Optional TLS Config
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# tls_ca = /path/to/cafile
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# tls_cert = /path/to/certfile
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# tls_key = /path/to/keyfile
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## Use TLS but skip chain & host verification
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# insecure_skip_verify = false
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```
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### DaemonSet
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For recommendations on running Telegraf as a DaemonSet see [Monitoring Kubernetes
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Architecture][k8s-telegraf] or view the [Helm charts][tick-charts].
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### Metrics
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- kubernetes_node
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- tags:
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- node_name
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- fields:
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- cpu_usage_nanocores
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- cpu_usage_core_nanoseconds
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- memory_available_bytes
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- memory_usage_bytes
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- memory_working_set_bytes
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- memory_rss_bytes
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- memory_page_faults
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- memory_major_page_faults
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- network_rx_bytes
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- network_rx_errors
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- network_tx_bytes
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- network_tx_errors
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- fs_available_bytes
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- fs_capacity_bytes
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- fs_used_bytes
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- runtime_image_fs_available_bytes
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- runtime_image_fs_capacity_bytes
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- runtime_image_fs_used_bytes
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- kubernetes_pod_container
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- tags:
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- container_name
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- namespace
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- node_name
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- pod_name
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- fields:
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- cpu_usage_nanocores
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- cpu_usage_core_nanoseconds
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- memory_usage_bytes
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- memory_working_set_bytes
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- memory_rss_bytes
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- memory_page_faults
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- memory_major_page_faults
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- rootfs_available_bytes
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- rootfs_capacity_bytes
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- rootfs_used_bytes
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- logsfs_avaialble_bytes
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- logsfs_capacity_bytes
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- logsfs_used_bytes
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- kubernetes_pod_volume
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- tags:
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- volume_name
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- namespace
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- node_name
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- pod_name
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- fields:
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- available_bytes
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- capacity_bytes
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- used_bytes
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- kubernetes_pod_network
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- tags:
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- namespace
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- node_name
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- pod_name
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- fields:
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- rx_bytes
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- rx_errors
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- tx_bytes
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- tx_errors
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### Example Output
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```
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kubernetes_pod_container,host=ip-10-0-0-0.ec2.internal,container_name=deis-controller,namespace=deis,node_name=ip-10-0-0-0.ec2.internal,pod_name=deis-controller-3058870187-xazsr cpu_usage_core_nanoseconds=2432835i,cpu_usage_nanocores=0i,logsfs_avaialble_bytes=121128271872i,logsfs_capacity_bytes=153567944704i,logsfs_used_bytes=20787200i,memory_major_page_faults=0i,memory_page_faults=175i,memory_rss_bytes=0i,memory_usage_bytes=0i,memory_working_set_bytes=0i,rootfs_available_bytes=121128271872i,rootfs_capacity_bytes=153567944704i,rootfs_used_bytes=1110016i 1476477530000000000
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kubernetes_pod_volume,host=ip-10-0-0-0.ec2.internal,name=default-token-f7wts,namespace=kube-system,node_name=ip-10-0-0-0.ec2.internal,pod_name=kubernetes-dashboard-v1.1.1-t4x4t available_bytes=8415240192i,capacity_bytes=8415252480i,used_bytes=12288i 1476477530000000000
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kubernetes_pod_network,host=ip-10-0-0-0.ec2.internal,namespace=deis,node_name=ip-10-0-0-0.ec2.internal,pod_name=deis-controller-3058870187-xazsr rx_bytes=120671099i,rx_errors=0i,tx_bytes=102451983i,tx_errors=0i 1476477530000000000
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```
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[metric filtering]: https://github.com/influxdata/telegraf/blob/master/docs/CONFIGURATION.md#metric-filtering
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[retention policy]: https://docs.influxdata.com/influxdb/latest/guides/downsampling_and_retention/
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[max-series-per-database]: https://docs.influxdata.com/influxdb/latest/administration/config/#max-series-per-database-1000000
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[max-values-per-tag]: https://docs.influxdata.com/influxdb/latest/administration/config/#max-values-per-tag-100000
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[tsi]: https://docs.influxdata.com/influxdb/latest/concepts/time-series-index/
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[series cardinality]: https://docs.influxdata.com/influxdb/latest/query_language/spec/#show-cardinality
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[influx-docs]: https://docs.influxdata.com/influxdb/latest/
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[k8s-telegraf]: https://www.influxdata.com/blog/monitoring-kubernetes-architecture/
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[tick-charts]: https://github.com/influxdata/tick-charts
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