loki/docs/promtail-examples.md

promtail examples

In this file you can see simple examples of configure promtail

• This example of config promtail based on original docker config and show how work with 2 and more sources:

Filename for example: my-docker-config.yaml

server:
  http_listen_port: 9080
  grpc_listen_port: 0

positions:
  filename: /tmp/positions.yaml

client:
  url: http://ip_or_hostname_where_Loki_run:3100/api/prom/push

scrape_configs:
 - job_name: system
   entry_parser: raw
   static_configs:
   - targets:
      - localhost
     labels:
      job: varlogs
      host: yourhost
      __path__: /var/log/*.log

 - job_name: someone_service
   entry_parser: raw
   static_configs:
   - targets:
      - localhost
     labels:
      job: someone_service
      host: yourhost
      __path__: /srv/log/someone_service/*.log

Description

Scrape_config section of config.yaml contents are various jobs for parsing your logs on current host

job and host these are tags on which you can filter parsed logs date on Grafana later

__path__ it is path to directory where stored your logs.

If you run promtail and this config.yaml in Docker container, don't forget use docker volumes for mapping real directories with log to those folders in the container.

• See next example of Dockerfile, who use our modified promtail config (my-docker-config.yaml)

1. Create folder, for example promtail, then new folder build and in this filder conf and place there my-docker-config.yaml.
2. Create new Dockerfile in root folder promtail, with contents

FROM grafana/promtail:latest
COPY build/conf /etc/promtail

3. Create your Docker image based on original Promtail image and tag it, for example mypromtail-image
4. After that you can run Docker container by this command: docker run -d --name promtail --network loki_network -p 9080:9080 -v /var/log:/var/log -v /srv/log/someone_service:/srv/log/someone_service mypromtail-image -config.file=/etc/promtail/my-docker-config.yaml