Lumogon

Lumogon provides a way to inspect, analyze and report on your running Docker containers.

Trying out Lumogon

Downloading Lumogon

You'll need Docker installed and running locally. This should already be true if you have Docker containers you want to analyze with Lumogon.

docker pull puppet/lumogon

Running Lumogon

Now that you have Lumogon installed, let's run it to find out which containers you have running and what we can learn about them. The output from a Lumogon scan will be a JSON listing of all the containers found and what Lumogon could learn about them.

Since JSON can be hard to read as one big unstructured message, you might want to use a "pretty-printer" like jq to print the data in a more readable format.

docker run --rm  -v /var/run/docker.sock:/var/run/docker.sock puppet/lumogon scan | jq

After a few seconds you should see your JSON data:

{
  "$schema": "http://puppet.com/lumogon/core/draft-01/schema#1",
  "generated": "2017-05-09 07:59:24.287008012 +0000 UTC",
  "owner": "default",
  "group": [
    "default"
  ],
  "client_version": {
    "BuildVersion": "development",
    "BuildTime": "2017-05-09 06:56:22 UTC",
    "BuildSHA": "9e8f684432ff12b04b5b5d594caa0ebcce86b844"
  },
  "reportid": "c73a79dc-8612-4af8-8bd8-22e32ea11e38",
  "containers": {
    "5982d3f16bbbf9530ae09915b22a0d189044e3b953e5e417e2783b90de579034": {
      "$schema": "http://puppet.com/lumogon/containerreport/draft-01/schema#1",
      "generated": "2017-05-09 07:59:03.513739277 +0000 UTC",
      "container_report_id": "8d17e541-11b3-4f25-b145-4ad9d3045995",
      "container_id": "5982d3f16bbbf9530ae09915b22a0d189044e3b953e5e417e2783b90de579034",
      "container_name": "/fixtures_alpine_1",
      "capabilities": {
        "apk": {
          "$schema": "http://puppet.com/lumogon/capability/label/draft-01/schema#1",
          "title": "Packages (APK)",
          "type": "dockerapi",
          "harvestid": "3a5bf0d4-36d8-440b-af81-615b5493fe98",
          "payload": {
            "alpine-baselayout": "3.0.3-r0",
            "alpine-keys": "1.1-r0",
            "apk-tools": "2.6.7-r0",
            "busybox": "1.24.2-r9",
            "libc-utils": "0.7-r0",
            "libcrypto1.0": "1.0.2h-r1",
            "libssl1.0": "1.0.2h-r1",
            "musl": "1.1.14-r10",
            "musl-utils": "1.1.14-r10",
            "scanelf": "1.1.6-r0",
            "zlib": "1.2.8-r2"
          }
        },
        "dpkg": {
          "$schema": "http://puppet.com/lumogon/capability/label/draft-01/schema#1",
          "title": "Packages (DPKG)",
          "type": "dockerapi",
          "harvestid": "bdee3efe-70cf-4684-9eb6-cfbfeeb96b9c"
        },
        "host": {
          "$schema": "http://puppet.com/lumogon/capability/host/draft-01/schema#1",
          "title": "Host Information",
          "type": "attached",
          "harvestid": "53d1961c-e8e9-4b52-8620-6bac37a69664",
          "payload": {
            "hostname": "365cfca386ec",
            "kernelversion": "4.9.21-moby",
            "os": "linux",
            "platform": "alpine",
            "platformfamily": "alpine",
            "platformversion": "3.4.0",
            "procs": "61",
            "uptime": "248396",
            "virtualizationrole": "guest",
            "virtualizationsystem": "docker"
          }
        },
        "label": {
          "$schema": "http://puppet.com/lumogon/capability/label/draft-01/schema#1",
          "title": "Labels",
          "type": "dockerapi",
          "harvestid": "50a3f846-3580-4190-9b00-27c3011f1516",
          "payload": {
            "com.docker.compose.config-hash": "70e9897635135adc7e9bd0af535fef48ae8e26c8e0debbf8f40e0d67938a9884",
            "com.docker.compose.container-number": "1",
            "com.docker.compose.oneoff": "False",
            "com.docker.compose.project": "fixtures",
            "com.docker.compose.service": "alpine",
            "com.docker.compose.version": "1.11.2"
          }
        },
        "rpm": {
          "$schema": "http://puppet.com/lumogon/capability/label/draft-01/schema#1",
          "title": "Packages (RPM)",
          "type": "dockerapi",
          "harvestid": "1c2976f2-802c-4138-a6b7-e7a814340fea"
        }
      }
    }
  }
}

Since Lumogon's output is valid JSON, you can slice and dice it with jq, or pass it along to any other tool you use that can accept JSON input.

Sending reports to the Lumogon service

Lumogon provides an optional web service that can translate your JSON data into more human friendly reports.

docker run --rm -v /var/run/docker.sock:/var/run/docker.sock puppet/lumogon report

The report command generates the same data as scan, but sends it over HTTPS to the Lumogon reporting service and returns a URL to view your report.

https://reporter.app.lumogon.com/UuokYc0VMgA4oAZYaJRaN6O7xMqakDLsqgHGs0dBmJY=

More ways to use Lumogon

Let's get the usage for the Lumogon client:

docker run --rm  -v /var/run/docker.sock:/var/run/docker.sock puppet/lumogon --help
Lumogon is a tool for inspecting, reporting on, and analyzing your container applications.

Usage:
  lumogon [command]

Available Commands:
  help        Help about any command
  report      Scan one or more containers and send the collected information to the Lumogon service
  scan        Scan one or more containers and print the collected information
  version     Show the Lumogon version information

Flags:
  -d, --debug               Print debug logging
      --disable-analytics   Disable sending anonymous data for product improvement
  -k, --keep-harvesters     Keeps harvester containers instead of automatically deleting

Feel free to explore those command-line options. Of note:

The --keep-harvesters flag will preserve temporary containers created on the fly to explore your other containers. You can use docker logs <containerid> to see more of what they found while running.
You can specify scan to collect data on all your running containers, or you can target a specific container by passing scan <containerid>.
--debug will generate verbose debugging output so you can see how Lumogon explores your containers.

Building the client from source

If you're making changes to Lumogon, or just interested in seeing how it works under the hood, you might want to try building from source. For this you'll need a few more things:

Install Go, version 1.8 or later
Install make
Set your $GOPATH variable to the path where you want to keep your Go sources -- for example, ${HOME}/go.
Download the Lumogon source code
Build the Docker image

The terminal commands to do this are:

export GOPATH="${HOME}/go"
mkdir -p ${GOPATH}/src/github.com/puppetlabs
cd ${GOPATH}/src/github.com/puppetlabs
git clone https://github.com/puppetlabs/lumogon
cd $GOPATH/src/github.com/puppetlabs/lumogon
make all

Note that this build process isn't widely tested away from macOS yet but will eventually work everywhere.

Giving us feedback

We'd love to hear from you. We have a Slack channel for talking about Lumogon and please do open issues against the repository.

rick/lumogon