golo-cli

golo-cli is a CLI to interact with go-lo agents. It is able to:

• Find agents by tags on DigitalOcean and when running on localhost
• Upload schedule binaries
• Queue jobs with varying durations, users, and anything else an agent accepts

Installation

There is, currently, no packaged up golo-cli available. Instead it can be easily installed on machines with go installed. Should this not be the case, see here

$ go get github.com/go-lo/golo-cli

Usage

All of the below examples assume a go-lo agent is running on localhost. See below for integration with cloud providers.

$ golo-cli --help
Usage of golo-cli:
  -agent-tag string
        Tag value to query to find agents (default "agent")
  -f string
        Config file to load (default "config.toml")
  -provider string
        Cloud Provider to query for agents (default "localhost")
  -schedule string
        Schedule to upload (default "./schedule")

Running Loadtest Jobs

A job config file looks like:

# Formed of $type:$version. Omitting a version always defaults to 'latest'
type = "job:latest"

[schema]
name     = "my-loadtest"    # Name of the job
users    = 1024             # Users to simulate
duration = 300              # Length of time to run, in seconds

A job is paired with a schedule. A schedule is a binary which an agent runs; it is the loadtest. See go-lo/go-lo for further information. Note that this binary will need to be compiled with CGO_ENABLED=0 GOOS=linux set.

Assuming our toml lives in job.toml, and our schedule my-loadtest we can start our job with:

$ golo-cli -f job.toml --schedule ./my-loadtest

Integration with Cloud Providers

The CLI provides two flags pertinent to this topic:

  -agent-tag string
        Tag value to query to find agents (default "agent")
  -provider string
        Cloud Provider to query for agents (default "localhost")

Currently this software supports the following providers

Provider	Requirements	Description
localhost	None	Returns localhost and nothing else
digitalocean	env var $DO_TOKEN containing a valid do API token	Will return 0 or more addresses for droplets containing specified tag
env	$GOLO_HOSTS csv of hostnames of agents to use	Returns the contents of $GOLO_HOSTS split on the comma

Providers are simple to write; a provider needs to implement

type LookerUpper interface {
    Addresses(tag string) HostBinaryMap
}

And then be registered in lookup.go