Docker swarm node exporter host name

General Help/Support
1

hello,

I deployed node exporter on all my docker Hosts on a docker swarm cluster. My central prometheus is able through the swarm inventory to pull data from all node exporter containers.

The issue I have on prometheus is the instance is not the name of the host, but the IP of the node exporter container. This is a big issue because if we restart the container IP might change.

So i’m looking for a way to configure prometheus to add a tag with hostname.

Original configuration is :

  - job_name: 'node-exporter'
    dns_sd_configs:
    - names:
      - 'tasks.node-exporter'
      type: 'A'
      port: 9100

According to the documentation In understand we can use the swarm registry, but this is not working.

  - job_name: 'node-exporter'
    dockerswarm_sd_configs:
      - host: unix:///var/run/docker.sock
        role: tasks
        filters:
          - name: service
            values: ['monitoring_node-exporter']
    relabel_configs:
      - source_labels: [__meta_dockerswarm_task_name]
        regex: 'node-exporter\..*'
        action: keep

      - source_labels: [__meta_dockerswarm_task_container_port_publish]
        action: keep

      - source_labels: [__address__]
        target_label: __address__
        regex: '(.+):\d+'
        replacement: '${1}:9100'

      - source_labels: [__meta_dockerswarm_task_labels_prometheus_job]
        target_label: job
        replacement: $1
        action: replace

Do you have any idea on how I could setup this ?

best regards