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grafana-loki-syslog-aio

About The Project

This Loki Syslog All-In-One example is geared to help you get up and running quickly with a Syslog ingestor and visualization of logs. It uses Grafana Loki and Promtail as a receiver for forwarded syslog-ng logs. I wrote an introductory blog post about how this AIO project came about as well (pesky intermittent network issues!!)

Note that this All In One is geared towards getting network traffic from legacy syslog (RFC3164 UDP port 514) into Loki via syslog-ng and Promtail.

Essentially:

RFC3164 Network/Compute Devices -> syslog-ng (UDP port 514) -> Promtail (port 1514) -> Loki (port 3100) <- Grafana (port 3000)

Getting Started

The project is built around a pre-configured Docker stack of the following:

The stack has been extended to include pre-configured monitoring with:

A simple Syslog generator is included based on Vicente Zepeda Mas's random-logger project.

Prerequisites

Using

This project is built and tested on Linux CentOS 7. To get started, download the code from this repository and extract it into an empty directory. For example:

wget https://github.com/lux4rd0/grafana-loki-syslog-aio/archive/main.zip
unzip main.zip
cd grafana-loki-syslog-aio-main

From that directory, run the docker-compose command:

Full Example Stack: Grafana, Loki with s3/MinIO, Promtail, syslog-ng, Prometheus, cAdvisor, node-exporter

docker-compose -f ./docker-compose.yml up -d

This will start to download all of the needed application containers and start them up.

(Optional docker-compose configurations are listed under Options below)

Grafana Dashboards

Once all of the docker containers are started up, point your Web browser to the Grafana page, typically http://hostname:3000/ - with hostname being the name of the server you ran the docker-compose up -d command on. The "Loki Syslog AIO - Overview" dashboard is defaulted without having to log in.

Note: this docker-compose stack is designed to be as easy as possible to deploy and go. Logins have been disabled, and the default user has an admin role. This can be changed to an Editor or Viewer role by changing the Grafana environmental variable in the docker-compose.yml file to:

GF_AUTH_ANONYMOUS_ORG_ROLE: Viewer

Getting Started With Loki

Here are some additional resources you might find helpful if you're just getting started with Loki:

Stack Options:

A few other docker-compose files are also available:

Full Example Stack with Syslog Generator: Grafana, Loki with s3/MinIO, Promtail, syslog-ng, Prometheus, cAdvisor, node-exporter, Syslog Generator

docker-compose -f ./docker-compose-with-generator.yml up -d

Example Stack without monitoring or Syslog generator: Grafana, Loki with s3/MinIO, Promtail, syslog-ng

docker-compose -f ./docker-compose-without-monitoring.yml up -d

Example Stack without MinIO, monitoring, or Syslog generator: Grafana, Loki with the filesystem, Promtail, syslog-ng

docker-compose -f ./docker-compose-filesystem.yml up -d

The Syslog Generator configuration will need access to the Internet to do a local docker build from the configurations location in ./generator. It'll provide some named hosts and random INFO, WARN, DEBUG, ERROR logs sent over to syslog-ng/Loki.

Configuration Review:

The default Loki storage configuration docker-compose.yml uses S3 storage with MinIO. If you want to use the filesystem instead, use the different docker-compose configurations listed above or change the configuration directly. An example would be:

volumes:
- ./config/loki-config-filesystem.ym:/etc/loki/loki-config.yml:ro

Changing MinIO Keys

The MinIO configurations default the Access Key and Secret Key at startup. If you want to change them, you'll need to update two files:

./docker-compose.yml

  MINIO_ACCESS_KEY: minio123
  MINIO_SECRET_KEY: minio456

./config/loki-config-s3.yml

 aws:
  s3: s3://minio123:minio456@minio.:9000/loki

Changed Default Configurations In syslog-ng and Promtail

To set this example All In One project up, the following configurations have been added to the docker-compose.yml. If you already have syslog-ng running on your deployment server - make similar changes below and comment out the docker container stanza.

SYSLOG-NG CONFIGURATION (docker container listens on port 514)

# syslog-ng.conf

source s_local {
    internal();
};

source s_network {
    default-network-drivers(
    );
};

destination d_loki {
    syslog("promtail" transport("tcp") port("1514"));
};

log {
        source(s_local);
        source(s_network);
        destination(d_loki);
};

Note: the above "promtail" configuration for destination d_loki is the hostname where Promtail is running. Is this example, it happens to be the Promtail docker container name that I configured for the All-In-One example.

PROMTAIL CONFIGURATION (docker container listens on port 1514)

# promtail-config.yml

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: syslog
  syslog:
    listen_address: 0.0.0.0:1514
    idle_timeout: 60s
    label_structured_data: yes
    labels:
      job: "syslog"
  relabel_configs:
    - source_labels: ['__syslog_message_hostname']
      target_label: 'host'

Contributing

Contributions make the open source community such a fantastic place to learn, inspire, and create. Any contributions you make are greatly appreciated.

  • Fork the Project
  • Create your Feature Branch (git checkout -b feature/AmazingFeature)
  • Commit your Changes (git commit -m 'Add some AmazingFeature')
  • Push to the Branch (git push origin feature/AmazingFeature)
  • Open a Pull Request

Contact

Dave Schmid - @lux4rd0 - [email protected]

Project Link: https://github.com/lux4rd0/grafana-loki-syslog-aio

Acknowledgements