Node Exporter have wrong nodename in node_uname_info.

[Sohaib Omar]

Hi all, 

I am stuck in some weird situation. in metric node_uname_info I get the same value for nodename and pod label. 

node_uname_info{domainname="(none)",endpoint="metrics",instance="x.x.x.x:9100",job="node-exporter",machine="x86_64",namespace="monitoring",nodename="node-exporter-ljhlp",pod="node-exporter-
ljhlp",release="4.15.0-96-generic",service="node-exporter",sysname="Linux",version="#97-Ubuntu SMP Wed Apr 1 03:25:46 UTC 2020"}

Any idea what might be wrong here. My node-exporter scrape config is as below:

- job_name: node-exporter

  honor_labels: false

  kubernetes_sd_configs:

  - role: endpoints

    namespaces:

      names:

      - monitoring

  scrape_interval: 30s

  scheme: https

  tls_config:

    insecure_skip_verify: true

  relabel_configs:

  - action: keep

    source_labels:

    - __meta_kubernetes_service_label_k8s_app

    regex: node-exporter

  - action: keep

    source_labels:

    - __meta_kubernetes_endpoint_port_name

    regex: https

  - source_labels:

    - __meta_kubernetes_endpoint_address_target_kind

    - __meta_kubernetes_endpoint_address_target_name

    separator: ;

    regex: Node;(.*)

    replacement: ${1}

    target_label: node

  - source_labels:

    - __meta_kubernetes_endpoint_address_target_kind

    - __meta_kubernetes_endpoint_address_target_name

    separator: ;

    regex: Pod;(.*)

    replacement: ${1}

    target_label: pod

  - source_labels:

    - __meta_kubernetes_namespace

    target_label: namespace

  - source_labels:

    - __meta_kubernetes_service_name

    target_label: service

  - source_labels:

    - __meta_kubernetes_pod_name

    target_label: pod

  - source_labels:

    - __meta_kubernetes_service_name

    target_label: job

    replacement: ${1}

  - source_labels:

    - __meta_kubernetes_service_label_k8s_app

    target_label: job

    regex: (.+)

    replacement: ${1}

  - target_label: endpoint

    replacement: https

Prometheus version: 2.17.1
Node Exporter: v0.18.1

[Julius Volz]

On Fri, Apr 24, 2020 at 2:37 PM Sohaib Omar <soha...@gmail.com> wrote:

Hi all, 

I am stuck in some weird situation. in metric node_uname_info I get the same value for nodename and pod label. 

That is to be expected, because uname's "nodename" refers to the hostname, and Kubernetes by default sets a pod's hostname to the pod's name.

See https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/:

"Currently when a pod is created, its hostname is the Pod’s metadata.name value."

[Sohaib Omar]

Got it now, thanks once again, Julius.