Hello,
I want to know if we have to install Prometheus on a Docker Swarm Manager o
if it is possible to install it to a Worker one to retrieve Docker Swarm
Cluster metrics.
I actually encountered the following issue:
monitoring_prometheus.1.ntwl9vdheus9@gb40000p822c3 | level=error
ts=2021-02-04T10:09:38.463Z caller=refresh.go:98 component="discovery
manager scrape" discovery=dockerswarm msg="Unable to refresh target groups"
err="error while listing swarm services: Error response from daemon: This
node is not a swarm manager. Worker nodes can't be used to view or modify
cluster state. Please run this command on a manager node or promote the
current node to a manager."
Which seems to be an issue that the Worker node cannot scap the metrics to
the Manager (make sense).
Install Docker services on a Docker Swarm Manager is not in the Swarm
best-practises so is there any possibility with an example or some
documentation to use maybe the Docker HTTP other /var/run/docker.sock?
This is my prometheus.yml configuration:
global:
scrape_interval: 30s
scrape_timeout: 30s
evaluation_interval: 5m
external_labels:
monitor: testing-monitoring
scrape_configs:
# Prometheus
- job_name: prometheus
static_configs:
- targets:
- prometheus:9090
# Docker Swarm job
- job_name: 'testing-dockerswarm'
dockerswarm_sd_configs:
- host: unix:///var/run/docker.sock
role: tasks
relabel_configs:
- source_labels: [__address__]
separator: ':'
regex: '(.*):(8089)'
target_label: __address__
replacement: '${1}:8080'
- source_labels: [__address__]
regex: '(.+)\:(9100|8080|9307|9308)'
action: keep
- source_labels: [__meta_dockerswarm_network_name]
regex: 'monitoring_.+'
action: keep
- source_labels: [__meta_dockerswarm_task_desired_state]
regex: 'running'
action: keep
- source_labels: [__meta_dockerswarm_node_hostname]
target_label: node_name
- source_labels: [__meta_dockerswarm_node_id]
target_label: node_id
Thanks in advance for your time.
Kind Regards,
Thomas
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