Role for managing loki

For possible settings and format look at example configs

This role only installs loki. For promtail, see this role

Compatibility

This role is compatible with any modern systemd-based distro.

Role Variables

Variable name	Default value	Description
loki_version	2.7.3	version of loki
loki_system_user	loki	user for running loki
loki_system_group	loki	group for running loki
loki_server_http_listen_port	3100	listen port for loki
loki_server_http_listen_address	localhost	listen address for loki
loki_directories	[]	array of directories to create before running loki
loki_arguments	[]	arguments to pass to loki binary
loki_memberlist	empty	YAML with memberlist settings
loki_schema_config	default dict	YAML with schema config
loki_storage_config	default dict	YAML with storage config
loki_ingester	default dict	YAML with ingester settings
loki_limits_config	default dict	YAML with limits settings
loki_chunk_store_config	default dict	YAML with chuck store settings
loki_table_manager	default dict	YAML with table manager settings
loki_compactor	empty	YAML with compactor settings
loki_query_range	empty	YAML with query range settings
loki_ruler	empty	YAML with ruler settings
loki_alert_rules	[]	YAML with alerts

Settings

To configure loki with role you just need to supply YAML to each corresponding block. See example configs from loki github repo for examples.
Default settings are provided to get "proof-of-concept" installation up and running, you can see them in defaults/main.yml
Please note that by default loki writes to /tmp/, you will need to adjust loki_storage_config in case you want S3/GCS/other supported storage

Alerts (WIP, not working ATM)

To use alerts you will need to use loki's ruler. Default setting enables it, with rules stored in /tmp with empty ruleset. Alerts follows prometheus format.

Sample alert:

loki_alert_rules:
  groups:
    - name: nginx
      rules:
        - alert: nginx
          annotations:
            description: Errors in nginx requests
          expr: '{% raw %}sum(count_over_time({app="nginx", container="application", type="error"} > 0{% endraw %}'
          for: 1m
          labels:
            severity: warning