# https://raw.githubusercontent.com/grafana/loki/v2.8.0/production/docker-compose.yaml
# https://grafana.com/docs/loki/latest/clients/docker-driver/

- name: Set up Loki
  hosts: lotus-land-story
  tasks:

    - name: Provision Grafana
      ansible.builtin.copy:
        dest: /mnt/lotus-land-story/grafana/provisioning/datasources/loki.yml
        content: |
          apiVersion: 1

          datasources:
            - name: Loki
              type: loki
              access: proxy
              url: http://loki:3100
        mode: "0644"

    - name: Create Loki config dirs
      ansible.builtin.file:
        path: /mnt/lotus-land-story/loki/{{ item }}
        state: directory
        owner: 10001
        group: 10001
        mode: "0755"
      loop:
        - config
        - data

    - name: Configure Loki
      ansible.builtin.copy:
        dest: /mnt/lotus-land-story/loki/config/loki.yml
        content: |
          auth_enabled: false
          server:
            http_listen_port: 3100
          common:
            path_prefix: /loki
            storage:
              filesystem:
                chunks_directory: /loki/chunks
                rules_directory: /loki/rules
            replication_factor: 1
            ring:
              kvstore:
                store: inmemory
          compactor:
            retention_enabled: true
          limits_config:
            retention_period: 168h
          schema_config:
            configs:
              - from: 2020-10-24
                store: boltdb-shipper
                object_store: filesystem
                schema: v11
                index:
                  prefix: index_
                  period: 24h

              # https://grafana.com/docs/loki/latest/operations/storage/tsdb/
              - from: 2023-07-17
                index:
                  period: 24h
                  prefix: index_
                object_store: filesystem
                schema: v12
                store: tsdb

          storage_config:
            filesystem:
              directory: /data
          ruler:
            alertmanager_url: http://localhost:9093
        owner: 10001
        group: 10001
        mode: "0644"

    # https://github.com/grafana/loki/issues/2361
    - name: Configure Promtail
      ansible.builtin.copy:
        dest: /mnt/lotus-land-story/loki/config/promtail.yml
        content: |
          server:
            http_listen_port: 9080
            grpc_listen_port: 0
          positions:
            filename: /tmp/positions.yaml
          clients:
            - url: http://loki:3100/loki/api/v1/push
          scrape_configs:
            - job_name: system
              static_configs:
              - targets:
                  - localhost
                labels:
                  job: varlogs
                  __path__: /var/log/*.log
                  __path_exclude__: /var/log/syslog
            - job_name: docker
              docker_sd_configs:
                - host: unix:///var/run/docker.sock
                  refresh_interval: 5s
              relabel_configs:
                - source_labels: ['__meta_docker_container_name']
                  regex: '/(.*)'
                  target_label: 'container'
            - job_name: syslog
              syslog:
                listen_address: 0.0.0.0:514
                listen_protocol: tcp
                idle_timeout: 60s
                label_structured_data: yes
                labels:
                  job: syslog
              relabel_configs:
                - source_labels: ['__syslog_message_hostname']
                  target_label: 'host'
                - source_labels: ['__syslog_message_severity']
                  target_label: level
                - source_labels: ['__syslog_message_facility']
                  target_label: syslog_facility
                - source_labels: ['__syslog_message_app_name']
                  target_label: syslog_identifier
        mode: "0644"

    - name: Run Loki
      community.docker.docker_container:
        name: loki
        image: grafana/loki:2.8.0
        restart: true
        command: -config.file=/mnt/config/loki.yml
        ports:
          - "3100:3100"
        volumes:
          - /mnt/lotus-land-story/loki/config:/mnt/config
          - /mnt/lotus-land-story/loki/data:/data
        restart_policy: unless-stopped
        networks:
          - name: lotus_land_story
        etc_hosts:
          host.docker.internal: host-gateway

    - name: Run Promtail
      community.docker.docker_container:
        name: promtail
        image: grafana/promtail:2.8.0
        restart: true
        command: -config.file=/mnt/config/promtail.yml
        ports:
          - "514:514"
        volumes:
          - /var/log:/var/log
          - /var/run/docker.sock:/var/run/docker.sock
          - /mnt/lotus-land-story/loki/config:/mnt/config
        restart_policy: unless-stopped
        networks:
          - name: lotus_land_story
        etc_hosts:
          host.docker.internal: host-gateway

    - name: Ship to promtail using rsyslog
      ansible.builtin.copy:
        content: |
          *.* action(type="omfwd"
                     protocol="tcp"
                     target="127.0.0.1"
                     port="514"
                     Template="RSYSLOG_SyslogProtocol23Format"
                     TCP_Framing="octet-counted"
                     KeepAlive="on")
        dest: /etc/rsyslog.d/50-promtail.conf
        mode: "0644"
      notify: Restart rsyslog

  handlers:
    - name: Restart rsyslog
      ansible.builtin.service:
        name: rsyslog
        state: restarted

# vim: ft=yaml.ansible