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Sumo Logic Collector for Docker

This repository offers several variants of Docker images to run the Sumo Logic collector. The batteries-included images contains one or more pre-configured sources. In Sumo, collectors use sources to collect data. The following images are available:

  • Docker Collection—This batteries-included image runs the collector with Sumo’s Docker Logs source and Docker Stats source. This allows you to collect container logs, events, and stats, and to use the Sumo web app for Docker. For instructions on using this image, see Use the Docker Collection Image.

  • Syslog Collection—This batteries-included image runs the collector with Sumo’s Syslog source. The collector will listen on port 514 TCP and UDP for Syslog traffic. For more information, see Use the Syslog Collection Image.

  • File Collection—This batteries-included image runs the collector with Sumo’s local file source. This allows you to collect all files from /tmp/clogs/ from a Docker volume on the host. For more information, see Use the File Collection Image.

  • Custom Configuration—This is a base image you can use to build your own custom-configured collector image. For more information, see Create a Custom Docker Image.

When you run a collector image, the collector automatically registers with the Sumo service and creates sources based on a sumo-sources.json file. In each of the batteries-included images, the collector is configured to be ephemeral: it will be deleted automatically after being offline for 12 hours. For information about ephemeral collectors, see Set a Collector as Ephemeral, in Sumo help.

Use the Docker collection image

The batteries-included image tagged latest runs the collector with Sumo’s Docker Logs source and Docker Stats source.

When run, the collector listens on the Docker Unix socket for container logs, events and stats.

Sumo’s Docker Logs source and Docker Stats source use the Docker Engine API to gather the following data from Docker:

  • Docker container logs. Sumo’s Docker Logs source collects container logs. For information about the API Sumo uses to collect logs, see Get Container Logs in Docker API documentation.

  • Docker events. Sumo’s Dockers log source collect Docker events. For information about Docker events, see Monitor Events in Docker API documentation.

  • Docker container stats. Sumo’s Docker stats source collects stats. For information about Docker stats, see Get Container Stats Based on Resource Usage in Docker API documentation.

Prerequisites and limitations

The containers you’re going to monitor must use either the json-file or the journald driver. For more information, see Configure Logging Drivers in Docker help.

By default, you can monitor up to 40 Docker containers on a Docker host. If you want to monitor more than 40 containers on a given host, see To monitor more than 40 containers.

Step 1 Create Sumo Access ID and Key

If you don’t already have a Sumo account, you can create one by clicking Free Trial on https://www.sumologic.com/.

Log into Sumo to create an access ID and an access key to register the Sumo collector. For instructions, see Access Keys in Sumo help. Make a note of the access ID and access key. You supply these credentials when you start the Sumo collector.

Step 2 Tailor source configuration

There are two Sumo sources included in the image: Docker logs and Docker stats. The JSON file defines the sources is at https://github.com/SumoLogic/sumologic-collector-docker/blob/master/docker-sources/sumo-sources.json.

The Docker logs source in the image collects container logs from all containers on a Docker host, and events. Processing of multiline log messages is not enabled.

The Docker stats source collects Docker stats from all containers on a Docker host. The polling interval is set to one minute.

If you want to change the configuration of one or both of the sources, you can create your own sumo-sources.json using https://github.com/SumoLogic/sumologic-collector-docker/blob/master/docker-sources/sumo-sources.json as a starting point.

For example:

  • If you only want to monitor Docker logs, remove the Docker-stats object from the sources array.

  • If you want to collect logs and events from only selected containers, set allContainers in the Docker-logs object to false, and specify selected containers using specifiedContainers.

  • If you want to collect stats from only selected containers, set allContainers in the Docker-stats object to false, and specify selected containers using specifiedContainers. For more information, see More about defining container filters.

  • If you want to prevent the Docker logs source from collecting events (start, stop, and so on) set collectEvents in the Docker-logs object to false.

For general information about configuring Docker sources, see Docker log source and Docker stats source in Sumo help.

When you run the image, specify the location of your sumo-sources.json file using the SUMO_SOURCES_JSON environment variable. For information about using environment variables, see the Collector environment variables below.

More about defining container filters

In the Container Filter field, you can enter a comma-separated list of one or more of the following types of filters:

  • A specific container name, for example, “my-container”
  • A wildcard filter, for example, “my-container-*”
  • An exclusion (blacklist) filter, which begins with an exclamation mark, for example, ”!master-container” or “!prod-*”

For example, this filter list:

prod-*, !prod-*-mysql, master-*-app-*, sumologic-collector

will cause the source to collect from all containers whose names start with “prod-”, except those that match “prod-*-mysql”. It will also collect from containers with names that match “master-*-app-*”, and from the “sumologic-collector” container.

If your filter list contains only exclusions, the source will collect all containers except from those that match your exclusion filters. For example:

!container123*, !prod-*

will cause the source to exclude containers whose names begin with “container123” and “prod-”.

Step 3 Run the image

To run the Docker Collection image, run the following command, supplying your access ID and access key.

docker run -d -v /var/run/docker.sock:/var/run/docker.sock --name="sumo-logic-collector" sumologic/collector:latest AccessID AccessKey

The collector can be configured either with environment variables, or a volume-mounted user.properties file, as described in the sections below.

Collector environment variables

The following environment variables are supported. You can pass environment variables to the docker run command with the -e flag.

Environment Variable     Description
SUMO_ACCESS_ID Passes the Access ID.
SUMO_ACCESS_KEY Passes the Access Key.
SUMO_ACCESS_ID_FILE Passes a bound file path containing Access ID.
SUMO_ACCESS_KEY_FILE Passes a bound file path containing Access Key.
SUMO_CLOBBER When true, if there is an existing collector with the same name, that collector will be deleted.

Default: false
SUMO_COLLECTOR_NAME Configures the name of the collector. The default is set dynamically to the value in /etc/hostname.
SUMO_COLLECTOR_NAME_PREFIX Configures a prefix to the collector name. Useful when overriding SUMO_COLLECTOR_NAME with the Docker hostname.

Default: "collector_container-"

If you do not want a prefix, set the variable as follows:

SUMO_COLLECTOR_NAME_PREFIX = ""
SUMO_DISABLE_SCRIPTS If your organization's internal policies restrict the use of scripts, you can disable the creation of script-based script sources. When this parameter is passed, this option is removed from the Sumo web application, and script source cannot be configured.

Default: false.
SUMO_GENERATE_USER_PROPERTIES Set this variable to “false” if you are providing the collector configuration settings using a user.properties file via a Docker volume mount.
SUMO_JAVA_MEMORY_INIT Sets the initial java heap size (in MB).

Default: 64
SUMO_JAVA_MEMORY_MAX Sets the maximum java heap size (in MB).

Default: 128.
SUMO_PROXY_HOST Sets proxy host when a proxy server is used.
SUMO_PROXY_NTLM_DOMAIN Sets proxy NTLM domain when a proxy server is used with NTLM authentication.
SUMO_PROXY_PASSWORD Sets proxy password when a proxy server is used with authentication.
SUMO_PROXY_PORT Sets proxy port when a proxy server is used.
SUMO_PROXY_USER Sets proxy user when a proxy server is used with authentication.
SUMO_SOURCES_JSON Specifies the path to the sumo-sources.json file.

Default: /etc/sumo-sources.json.
SUMO_SYNC_SOURCES If “true”, the SUMO_SOURCES_JSON file(s) will be continuously monitored and synchronized with the Collector's configuration. This will also disable editing of the collector in the Sumo UI.

Default: false

Configure collector in user.properties file

You can supply source configuration values using a user.properties file via a Docker volume mount. For information about supported properties, see user.properties in Sumo help. For information about Docker volumes, see Use Volumes in Docker help.

Note If you configure a source using user.properties, you cannot update the source configuration using the Sumo web app or the collector management API.

To use a custom user.properties file, you must pass the environment variable SUMO_GENERATE_USER_PROPERTIES=false, and provide the Docker volume mount to replace the file located at /opt/SumoCollector/config/user.properties.

For example:

docker run other options -e SUMO_GENERATE_USER_PROPERTIES=false -v $some_path/user.properties:/opt/SumoCollector/config/user.properties sumologic/collector:$tag

To monitor more than 40 containers

By default, you can collect from up to 40 containers. To increase the limit:

  1. Open a bash shell with the running collector container with either:

docker exec -ti container_id /bin/bash

or

docker exec -ti container_name /bin/bash

  1. Edit the file located at /opt/SumoCollector/config/collector.properties, to add the docker.maxPerContainerConnections property. The maximum supported value is 100.

  2. Exit the shell.

  3. Restart the container with either:

docker restart container_id

or

docker restart container_name

To avoid exposing your keys on the command line

Use Docker Secret Management

To prevent exposing your keys on the commandline, use the following command lines:

# be sure you have an up and running docker swarm cluster (1 node or more):
docker swarm init
# store your API keys using docker secret manager:
echo AccessID | docker secret create sumo-access-id
echo AccessKey | docker secret ceate sumo-access-key
docker service create --name sumologic-collector --mount type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock --mode global --secret sumo-access-id --secret sumo-secret-key -e SUMO_ACCESS_ID_FILE=/run/secret/sumo-access-id -e SUMO_ACCESS_KEY_FILE=/run/secrets/sumo-access-key sumologic/collector:latest

Using this commandline, the service will automatically be deployed to all nodes of your swarm cluster thanks to the global mode.

Store and historize your configuration with docker-compose file and docker stack

You can automate your swarm cluster creation using docker-compose file together with the docker stack command and docker secret management.

# be sure you have an up and running docker swarm cluster (1 node or more):
docker swarm init
# store your API keys using docker secret manager:
echo AccessID | docker secret create sumo-access-id
echo AccessKey | docker secret ceate sumo-access-key

cat > docker-compose.yml <<EOF
version: '3.2'

services:

  sumologic:
    image: sumologic/collector:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
    deploy:
      mode: global
    secrets:
      - sumo-access-id
      - sumo-access-key
    environment:
      SUMO_ACCESS_ID_FILE: /run/secrets/sumo-access-id
      SUMO_ACCESS_KEY_FILE: /run/secrets/sumo-access-key

secrets:
  sumo-access-id:
    external: true
  sumo-access-key:
    external: true

EOF
docker stack deploy --compose-file docker-compose.yml sumologic

Step 4 Install Sumo app for Docker

The Sumo app for Docker provides operational insight into your Docker containers. The app includes dashboards that allow you to view container performance statistics for CPU, memory, and the network. It also provides visibility into container events such as start, stop, and so on.

For installation instructions, see Install the Docker App.

Step 5 Run searches and use dashboards

At this point, Sumo should be receiving Docker data. For an example of logs collected from Docker, see Sample Docker messages. For an example query, see Sample query for containers created or started.

For information about the dashboards provided by the Sumo app for Docker, see Docker App Dashboards.

Sample Docker messages

This is an example of two Docker event logs:

{"status":"start", "id":"10adec58fa15202e06afef7b1b0b3b1464962a115ff56918444c3f22867d3f3b", "from":"hello-world", "time":1485975967}

{"status":"create", "id":"045599bc4d589264658f5f7f4efa3f1e3af9088ba1f7383a160cf344e1055d46", "from":"ubuntu", "time":1485966852}

This is an example of a Docker stats message:

{"read" : "2017-02-01T19:36:48.777487188Z", "network" : {"rx_bytes":87977,"rx_dropped":0,"rx_errors":0,"rx_packets":252,"tx_bytes":146194,"tx_dropped":0,"tx_errors":0,"tx_packets":302}, "cpu_stats" : {"cpu_usage":{"percpu_usage":[9469809313],"total_usage":9469809313,"usage_in_kernelmode":1050000000,"usage_in_usermode":8410000000},"system_cpu_usage":2496992710000000,"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}}, "blkio_stats" : {"io_merged_recursive":[],"io_queue_recursive":[],"io_service_bytes_recursive":[],"io_service_time_recursive":[],"io_serviced_recursive":[],"io_time_recursive":[],"io_wait_time_recursive":[],"sectors_recursive":[]}, "memory_stats" : {"limit":1033252864,"max_usage":202858496,"stats":{"active_anon":86831104,"active_file":13131776,"cache":24981504,"dirty":36864,"hierarchical_memory_limit":9223372036854771712,"inactive_anon":86786048,"inactive_file":11849728,"mapped_file":6430720,"pgfault":63351,"pgmajfault":146,"pgpgin":68526,"pgpgout":20040,"rss":173617152,"rss_huge":0,"total_active_anon":86831104,"total_active_file":13131776,"total_cache":24981504,"total_dirty":36864,"total_inactive_anon":86786048,"total_inactive_file":11849728,"total_mapped_file":6430720,"total_pgfault":63351,"total_pgmajfault":146,"total_pgpgin":68526,"total_pgpgout":20040,"total_rss":173617152,"total_rss_huge":0,"total_unevictable":0,"total_writeback":0,"unevictable":0,"writeback":0},"usage":201818112}}

Sample query for containers created or started

_sourceCategory=docker  ("\"status\":\"create\"" or "\"status\":\"start\"")  id from
| parse "\"status\":\"*\"" as status, "\"id\":\"*\"" as container_id, "\"from\":\"*\"" as image
| count_distinct(container_id)

Use the Syslog collection image

The batteries-included Syslog image is tagged latest-syslog. When you run it, the collector listens on port 514 for TCP and UDP Syslog traffic.

To run the Syslog collection image, run the following command, supplying your access ID and access key. If you have not created the credentials yet, see Create Sumo Access ID and Key.

docker run -d -p 514:514 -p 514:514/udp --name="sumo-logic-collector" sumologic/collector:latest-syslog Access ID Access key

Configuration options:

Use the file collection image

Another "batteries included" image is available and tagged latest-file. When run, the collector collects all files from /tmp/clogs/. Docker volumes need to be used to make logs available in this directory.

To run the file collection image, run the following command, supplying your access ID and access key. If you have not created the credentials yet, see Create Sumo Access ID and Key.

docker run -v /tmp/clogs:/tmp/clogs -d --name="sumo-logic-collector" sumologic/collector:latest-file Access ID Access Key

You can use the /etc/sumo-containers.json source file to collect logs from all containers.

docker run -v /var/lib/docker/containers:/var/lib/docker/containers:ro -d --name="sumo-logic-collector" -e SUMO_SOURCES_JSON=/etc/sumo-containers.json sumologic/collector:latest-file Access ID Access Key

Configuration options:

Create a custom Docker image

A base image to build your own image with a custom configuration is tagged latest-no-source. You must add /etc/sumo-sources.json to run it. This is the configuration file that specifies the sources, metadata, and settings that the collector should monitor.

Examples are available in example in GitHub, along with some example configuration files. Pick one of the examples and rename it to sumo-sources.json or create one from scratch. For more information, see [Use JSON to Configure Sources}(https://help.sumologic.com/Send-Data/Sources/03Use-JSON-to-Configure-Sources) in Sumo help.

After configuring a sumo-sources.json file, create a Dockerfile similar to the one below:

FROM sumologic/collector:latest-no-source
MAINTAINER Happy Sumo Customer
ADD sumo-sources.json /etc/sumo-sources.json

Build an image with your configuration:

docker build --tag="yourname/sumocollector"

To run your image, run the command below, supplying your access ID and access key. If you have not created the credentials yet, see Create Sumo Access ID and Key.

docker run -d --name="sumo-logic-collector" yourname/sumocollector Access ID Access Key

Depending on the configuration of your sources, additional command line parameters may be required to create the container.

Using source templates

The collector image supports source JSON configuration templates allowing for string substitution using environment variables. This works by finding all files with a .json.tmpl extension, looping through all environment variables and replacing the values. Finally the file is renamed to .json.

Note You can also create your own docker image with the tmpl files embedded rather than a volume mount.

For example, if the container was started with the following environment variables and file /etc/sumo-containers.json.tmpl:

docker run -v /var/lib/docker/containers:/var/lib/docker/containers:ro -v /path/to/sources:/sumo  -d --name="sumo-logic-collector" -e SUMO_SOURCES_JSON=/sumo/sources.json -e ENVIRONMENT=prod sumologic/collector:latest-file Access ID Access Key

File /path/to/sources/sources.json.tmpl

{
  "api.version": "v1",
  "sources": [
    {
      "sourceType" : "LocalFile",
      "name": "localfile-collector-container",
      "pathExpression": "/var/lib/docker/containers/**/*.log",
      "category": "${ENVIRONMENT}/containers"
    }
  ]
}

The resulting output of /sumo/sources.json will be

{
  "api.version": "v1",
  "sources": [
    {
      "sourceType" : "LocalFile",
      "name": "localfile-collector-container",
      "pathExpression": "/var/lib/docker/containers/**/*.log",
      "category": "prod/containers"
    }
  ]
}

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A Sumo Logic collector for Docker.

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