gornir

README ¶

Gornir is a pluggable framework with inventory management to help operate collections of devices. It's similar to nornir but in golang.

The goal is to be able to operate on many devices with little effort. For instance:

package main

import (
	"context"
	"os"

	"github.com/nornir-automation/gornir/pkg/gornir"
	"github.com/nornir-automation/gornir/pkg/plugins/connection"
	"github.com/nornir-automation/gornir/pkg/plugins/inventory"
	"github.com/nornir-automation/gornir/pkg/plugins/logger"
	"github.com/nornir-automation/gornir/pkg/plugins/output"
	"github.com/nornir-automation/gornir/pkg/plugins/runner"
	"github.com/nornir-automation/gornir/pkg/plugins/task"
)

func main() {
	log := logger.NewLogrus(false)

	file := "/go/src/github.com/nornir-automation/gornir/examples/hosts.yaml"
	plugin := inventory.FromYAML{HostsFile: file}
	inv, err := plugin.Create()
	if err != nil {
		log.Fatal(err)
	}

	gr := gornir.New().WithInventory(inv).WithLogger(log).WithRunner(runner.Parallel())

	// Open an SSH connection towards the devices
	results, err := gr.RunSync(
		context.Background(),
		&connection.SSHOpen{},
	)
	if err != nil {
		log.Fatal(err)
	}

	// defer closing the SSH connection we just opened
	defer func() {
		results, err = gr.RunSync(
			context.Background(),
			&connection.SSHClose{},
		)
		if err != nil {
			log.Fatal(err)
		}
	}()

	// Following call is going to execute the task over all the hosts using the runner.Parallel runner.
	// Said runner is going to handle the parallelization for us. Gornir.RunS is also going to block
	// until the runner has completed executing the task over all the hosts
	results, err = gr.RunSync(
		context.Background(),
		&task.RemoteCommand{Command: "ip addr | grep \\/24 | awk '{ print $2 }'"},
	)
	if err != nil {
		log.Fatal(err)
	}
	// next call is going to print the result on screen
	output.RenderResults(os.Stdout, results, "What is my ip?", true)
}

would render:

# What is my ip?
@ dev5.no_group
  - err: failed to retrieve connection: couldn't find connection

@ dev1.group_1
  - stdout: 10.21.33.101/24

  - stderr:
@ dev6.no_group
  - stdout: 10.21.33.106/24

  - stderr:
@ dev4.group_2
  - stdout: 10.21.33.104/24

  - stderr:
@ dev3.group_2
  - stdout: 10.21.33.103/24

  - stderr:
@ dev2.group_1
  - stdout: 10.21.33.102/24

  - stderr:

Examples

You can see more examples in the examples folder and run them with Docker-Compose as follows:

Create a development enviroment

make start-dev-env

Run any of the examples in the examples folder with make example. Specify the name of the example with EXAMPLE; for instance 2_simple_with_filter.

make example EXAMPLE=2_simple_with_filter

After you are done, make sure you stop the development enviroment

make stop-dev-env

The project is still work in progress and feedback/help is welcomed.

Expand ▾ Collapse ▴

Documentation ¶

Overview ¶

Package gornir provides a pluggable framework with inventory management to help operate collections of devices. It's similar to https://github.com/nornir-automation/nornir/ but in Go.

The goal is to be able to operate on many devices with little effort. For instance:

package main

import (
	"context"
	"os"

	"github.com/nornir-automation/gornir/pkg/gornir"
	"github.com/nornir-automation/gornir/pkg/plugins/connection"
	"github.com/nornir-automation/gornir/pkg/plugins/inventory"
	"github.com/nornir-automation/gornir/pkg/plugins/logger"
	"github.com/nornir-automation/gornir/pkg/plugins/output"
	"github.com/nornir-automation/gornir/pkg/plugins/runner"
	"github.com/nornir-automation/gornir/pkg/plugins/task"
)

func main() {
	log := logger.NewLogrus(false)

	file := "/go/src/github.com/nornir-automation/gornir/examples/hosts.yaml"
	plugin := inventory.FromYAML{HostsFile: file}
	inv, err := plugin.Create()
	if err != nil {
		log.Fatal(err)
	}

	gr := gornir.New().WithInventory(inv).WithLogger(log).WithRunner(runner.Parallel())

	results, err := gr.RunSync(
		context.Background(),
		&connection.SSHOpen{},
	)
	if err != nil {
		log.Fatal(err)
	}

	// defer closing the SSH connection we just opened
	defer func() {
		results, err = gr.RunSync(
			context.Background(),
			&connection.SSHClose{},
		)
		if err != nil {
			log.Fatal(err)
		}
	}()

	results, err = gr.RunSync(
		context.Background(),
		&task.RemoteCommand{Command: "ip addr | grep \\/24 | awk '{ print $2 }'"},
	)
	if err != nil {
		log.Fatal(err)
	}
	output.RenderResults(os.Stdout, results, "What is my ip?", true)
}

would render:

# What is my ip?
@ dev5.no_group
  - err: failed to retrieve connection: couldn't find connection

@ dev1.group_1
  - stdout: 10.21.33.101/24

  - stderr:
@ dev6.no_group
  - stdout: 10.21.33.106/24

  - stderr:
@ dev4.group_2
  - stdout: 10.21.33.104/24

  - stderr:
@ dev3.group_2
  - stdout: 10.21.33.103/24

  - stderr:
@ dev2.group_1
  - stdout: 10.21.33.102/24

  - stderr:

You can see more examples here: https://github.com/nornir-automation/gornir/tree/master/examples

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Path	Synopsis
examples
1_simple this is the simplest example possible	this is the simplest example possible
1_simple_processor this example is similar to 1_simple but it uses processors to render the result instead	this example is similar to 1_simple but it uses processors to render the result instead
2_simple_with_filter Similar to the simple example but filtering the hosts	Similar to the simple example but filtering the hosts
2_simple_with_filter_bis Similar to the simple_with_filter but leveraging included filters	Similar to the simple_with_filter but leveraging included filters
3_grouped_simple Here is an example of how we can compose tasks	Here is an example of how we can compose tasks
4_advanced_1 In this example we can see how we can call the runner asynchronously	In this example we can see how we can call the runner asynchronously
5_advanced_2 In this example we can see how we can call the runner asynchronously and process the results without having to wait for all the hosts to complete	In this example we can see how we can call the runner asynchronously and process the results without having to wait for all the hosts to complete
6_custom_ssh_config this is the simplest example possible	this is the simplest example possible
pkg
gornir Package gornir implements the core functionality and define the needed interfaces to integrate with the framework	Package gornir implements the core functionality and define the needed interfaces to integrate with the framework
plugins/connection Package connection implements various Connection plugins that can be run over Hosts	Package connection implements various Connection plugins that can be run over Hosts
plugins/filter Package filter provides a collection of gornir.FilterFunc	Package filter provides a collection of gornir.FilterFunc
plugins/inventory Package inventory implements various plugins to instantiate and populate a gornir.Inventor object	Package inventory implements various plugins to instantiate and populate a gornir.Inventor object
plugins/logger Package logger implements various plugins to log events	Package logger implements various plugins to log events
plugins/output Package output implements functions to help processing the results	Package output implements functions to help processing the results
plugins/processor Package processor implements plugins to process the task events and results	Package processor implements plugins to process the task events and results
plugins/runner Package runner implements various plugins that can be used to defined the strategy to execute tasks over hosts	Package runner implements various plugins that can be used to defined the strategy to execute tasks over hosts
plugins/task Package task implements various Task plugins that can be run over Hosts	Package task implements various Task plugins that can be run over Hosts