using orchestration in puppet enterprise 3 - puppetconf 2013

Using Orchestration in Puppet Enterprise 3Nick FagerlundTechnical Writer | Puppet Labs @nfagerlund

Friday, August 23, 13

puppetconf.com #puppetconf

How’s it goin.

Let’s talk about orchestration!

Raise your hand if you know what it is.

Specifically,let’s talk about…

• What it is, why you use it, and when

• HOW???

• Cool new features in Puppet Enterprise 3

• Concrete use cases

I already took notes for you.

http://docs.puppetlabs.com/pe/latest

OK, what’s orchestration.

It’s not configuration management.

It’s a different kind of automation.

They’re complementary!

Config management is:

• Modeling a desired state for systems…

• …enforcing that desired state…

• …and updating the model in order to update the state.

Orchestration is about:

• Executing actions…

• …on demand…

• …on a flexible group of systems.

What’s an “action?”

• Pre-defined actions are distributed as plugins.

• Actions have structured inputs and outputs.

• Actions can do... like, whatever. (Several built-in, or write your own.)

What’s “on demand?”

• Whenever you want—

• —either really quickly and in parallel—

• —or in a controlled series of batches.

Flexible group of systems?

• Select nodes by fact values

• Select by Puppet classes

• Select with dynamic data discovery

Instead of using a list of hostnames, set criteria to match against.

Why orchestrate?

• Controlling config management

• Gathering information

• Application deployment

• Routine or emergency maintenance

• Any of your day-to-day work that must happen interactively

Basically: What tasks do you want to Run Better on

Lots of Nodes?

How do you use orchestration?

(We wrote this down.)http://docs.puppetlabs.com/pe/latest/orchestration_invoke_cli.html

Two ways to invoke actions

• In the PE console

• On the command line

Two ways to invoke actions

• In the PE console

• On the command line (focusing here for today!)

1. Go to the command line

• SSH to puppet master server

• Switch user to “peadmin”

2. Decide on three things

• What action?

• What inputs/arguments?

• On which kinds of nodes?

3. Run your command

• mco <SUBCOMMAND> <ARGUMENTS> <OPTIONS> <FILTER>

Finding actions/inputs:http://docs.puppetlabs.com/pe/latest/orchestration_actions.html

Finding filter informationhttp://docs.puppetlabs.com/pe/latest/orchestration_invoke_cli.html#filtering-actions

Demo time!

What did we just see?

The mco command

• The mco command controls the orchestration engine.

• It has a bunch of subcommands, whose syntax can vary.

The subcommands

• mco rpc is the generic subcommand. It can do basically anything.

• All the other subcommands are simpler ways to do things you could probably do with mco rpc.

Specialized subcommands

• mco ping is exactly what it sounds like.

• mco find is a fast way to test filters.

• mco service mimics the familiar service command.

• mco package mimics apt and yum commands.

Specialized subcommands

• And mco puppet is for controlling Puppet.

How about those new features?

Batching / progressive deployment

• --batch <SIZE>

• --batch-sleep <SECONDS>

Batching / progressive deployment

• Good for rolling out new Puppet modules!

(demo)

Data plugins / dynamic discovery

• $ mco rpc puppet status -S "puppet().enabled=false"

Data plugins / dynamic discovery

• Advanced filtering

• Ad-hoc monitoring and reporting

(demo)

Sampling/limiting

• --1

• --limit <COUNT>

What next?

The built-in actions are useful, but orchestration

really shines when you roll your own.

For example:

(That’s it, that’s all the code.)

Info about writing actionshttp://docs.puppetlabs.com/pe/latest/orchestration_adding_actions.html#writing-mcollective-agent-plugins

Say hi later, and I can show you more!

Thank YouNick FagerlundTechnical Writer | Puppet Labs @nfagerlund

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