Exclude Docker Container Logs

Introduction

This article provides the steps needed to configure the Scalyr Agent's Docker monitor to exclude container names. More information on the parameters referenced below (and other Docker monitor fields) can be found here: https://app.scalyr.com/help/monitors/docker-monitor

Configuration

First, access the Scalyr Agent's Docker container

docker ps
docker exec -i -t <container ID> /bin/bash

Edit the Scalyr Agent's Docker configuration file in /etc/scalyr-agent-2/agent.d/docker.json

Using the text editor of your choice, update the monitors section

{
  monitors: [
    {
      module: "scalyr_agent.builtin_monitors.docker_monitor",
      container_globs: ["*"],
      container_globs_exclude: ["SERVICE_NAME"]
    }
  ]
}

Notes:

1. Since the container_globs and container_globs_exclude variables are specific to the Docker monitor, they don't require the SCALYR_ prefix
2. The container_globs variable is explicitly set to * (since it is "None" by default). It is processed before container_globs_exclude
3. Replace "SERVICE_NAME" with the name of the container(s) that you wish to exclude. Wildcards can be used.
   1. You can quickly retrieve the container name by running docker ps and referring to the "NAMES" column
   2. If possible, minimize the use of wildcards. For example, to exclude all containers containing the container name "web", either web* (suffixes included) or web (exact match) would work
4. The same configuration can also be applied to Docker labels via the label_include_globs and label_exclude_globs parameters (see: https://app.scalyr.com/help/monitors/docker-monitor).