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Installing Logagent on Docker

Please note the following instructions use the latest Logagent image from Docker Hub. If you want to use certified images please pull the image from Red Hat and Docker registries.

Certified Logagent Images

• Red Hat Certified Image: docker pull registry.connect.redhat.com/sematext/logagent
• Docker Certified Image: docker pull sematext/logagent

For Kubernetes or Helm installation instructions, see:

• Kubernetes Installation
• Helm Installation

Installation for Docker

The Logagent Docker image is pre-configured for the log collection on container platforms. It runs as a tiny container on every Docker host and collects logs for all cluster nodes and their containers. All container logs are enriched with Kubernetes and Docker EE/Swarm metadata.

See: sematext/logagent on Docker Hub.

Docker Run

The most basic way to start is via docker run command:

docker pull sematext/logagent
docker run -d --restart=always --name logagent \
-e LOGS_TOKEN=YOUR_LOGS_TOKEN \
-e LOGS_RECEIVER_URL="https://logsene-receiver.sematext.com" \
-v /var/run/docker.sock:/var/run/docker.sock sematext/logagent

Docker Compose

To use Docker Compose create docker-compose.yml as follows and insert real tokens:

# docker-compose.yml
logagent:
  image: 'sematext/logagent:latest'
  environment:
    - LOGS_TOKEN=YOUR_LOGS_TOKEN
    - LOGS_RECEIVER_URL="https://logsene-receiver.sematext.com"
  cap_add:
    - SYS_ADMIN
  restart: always
  volumes:
    - '/var/run/docker.sock:/var/run/docker.sock'

Then start Logagent with the docker-compose file:

docker-compose up -d

Docker Swarm and Docker Enterprise

Connect your Docker client to Swarm or UCP remote API endpoint and deploy Logagent with following docker command with your Logs App Token:

docker service create --mode global --name st-logagent \
--restart-condition any \
--mount type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
-e LOGS_TOKEN="REPLACE THIS WITH YOUR LOGS TOKEN" \
-e REGION=US \
sematext/logagent:latest

Configuration

To see detailed configuration params and manuals, see:

• Container Configuration Parameters
• Container Configuration Manual

Known Issues

Conflict with Docker logging-drivers. Logagent is running with a valid Logs Token, but Sematext Cloud does not show container logs.

Please note that Logagent collects logs via Docker Remote API. If you use a Docker logging-driver other than the default json-file driver, logs will not be available via the Docker Remote API.

Please make sure that your container or docker daemon uses json-file logging driver. This ensures that logs are exposed via Docker Remote API. To check, run the "docker logs" command. If "docker logs CID" shows container logs then Logagent should be able to collect the logs as well.

Please check the parsed timestamps! Logs with timestamps in the future (or several months or years in the past) might not be displayed in Sematext Cloud.