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Version: 1.15

Logging stack

This guide allows you to deploy logging and monitoring services thanks to your inventory.

Active services​

Add following services inside your inventory file group_vars/regards_nodes/main.yml:

# COTS
group_docker_cots:
  [...]
  elasticsearch_exporter:
    tag: "{{ group_docker_tags.cots }}"
  node_exporter:
    tag: "{{ group_docker_tags.cots }}"
  telegraf:
    tag: "{{ group_docker_tags.cots }}"
    # Telegraf, Node exporter and Fluentbit are global services
  kafka:
    tag: "{{ group_docker_tags.cots }}"
  fluentbit:
    tag: "{{ group_docker_tags.cots }}"
  fluentd:
    tag: "{{ group_docker_tags.cots }}"
  prometheus:
    tag: "{{ group_docker_tags.cots }}"
  loki:
    tag: "{{ group_docker_tags.cots }}"
  grafana:
    tag: "{{ group_docker_tags.cots }}"
    port: 3000

Multi-nodes swarm cluster​

If you have several nodes in your swarm cluster, you need to add node_label_placement_constraint to services that uses local disk: Loki and Prometheus.

group_docker_cots:
  [...]
  prometheus:
    [...]
    node_label_placement_constraint:
      key: type
      value: logging
  loki:
    [...]
    node_label_placement_constraint:
      key: type
      value: logging
info

In a multi node swarm cluster, we recommend to dedicate a node for logging and monitoring purpose using Swarm placement constraints

To do that, you need to edit your inventory file hosts to add the label used as a node_label_placement_constraint:

# REGARDS
[regards_nodes]
regards-slaveX labels='{"type": "logging"}' ansible_host=[...]
info

If you've updated labels on the hosts file, you need to patch swarm nodes using delete-swarm.yml then setup-vm.yml playbooks.

Configure Grafana service​

SSL​

If you have SSL certificates (like the one used by REGARDS frontend service), you can give them to Grafana:

group_docker_stack_domain: my-regards.cnes.fr
group_docker_cots:
  [...]
  grafana:
    host: "{{ group_docker_stack_domain }}"
    ssl:
      crt: "{{ group_docker_stack_domain }}.crt"
      key: "{{ group_docker_stack_domain }}.key"
info

When SSL informations are provided inside inventory, Grafana is available through HTTPS protocol.

Elasticsearch​

If you use the REGARDS Elasticsearch service (and not use a mutualised one), you can connect Grafana to see indexes from Elasticsearch server. You need to list indexes like this:

group_docker_cots:
  [...]
  grafana:
    datasources:
      regards_cots:
        elasticsearch_indexes:
          - project1
          - project2
          - ...
          # list here the REGARDS tenant in lower case

Postgres​

If you use a mutualised Postgres, you can configure how Grafana connects to each tenant

group_docker_cots:
  [...]
  grafana:
    datasources:
      custom:
        postgres:
          - name: BD Project <project name>
            url: <database URL>:<database port>
            user: <database user>
            password: <Database password - use Ansible Vault!>
            databases: 
              - <database name>
          [...]

That's it!