Cooking Perl with Chef

David Golden@xdg

[cliff]

A metaphoric cliff

From cozy job ... to entrepreneur

Fear...

Fear... am I crazy?

Fear... am I too old for this?

Startups are for college kids, right?

[hoodie picture]

Startup culture is a grind

All night hackathons? WTF?

[hackathon sleep pic(s)]

I will never beat 20 year-olds on hours

I don't want to for two big reasons

I don't want to for two big reasonslittle

I'm not afraid of running a business

I'm not afraid of programming

I'm afraid of operations

I'm afraid of things going horribly wrong

Fear... is motivating

Memorial Day Weekend, 2012

Got lucky!

Side projects take time, too

Work smarter, not harder

Doing things by hand (more than once) sucks

Infrastructure as code

Automate deploying the whole stack

Configuration management(Chef, Puppet, etc....)

WAIT!What's wrong with this idea?

Dependency hell

Perl applications are complex

App = perl + CPAN + your code

App = perl + CPAN + your code

CHIDateTimeDBIJSONMoosePlackPOETry::Tiny...

App = perl + CPAN + your code

CHIDateTimeDBIJSONMoosePlackPOETry::Tiny...

v1.0.0

App = Perl + CPAN + your code

CHIDateTimeDBIJSONMoosePlackPOETry::Tiny...

v1.0.0 v5.14.2

App = Perl + CPAN + your code

0.550.761.6222.532.06030.99891.3540.11...

v1.0.0 v5.14.2

App = Perl + CPAN + your code

0.550.761.6222.532.06030.99891.3540.11...

v1.0.0 v5.14.2 v1.0

App = Perl + CPAN + your code

0.550.761.6222.532.06030.99891.3540.11...

v1.0.0 v5.14.2 v1.0

App = Perl + CPAN + your code

0.550.761.6222.532.06030.99891.3540.11...

v1.0.0 v5.16.0 v1.0

App = Perl + CPAN + your code

0.550.761.6222.532.06030.99891.3540.11...

v1.0.1 v5.16.0 v1.0

Repeatable deployment

Repeatable deployment

... the same Perl

Repeatable deployment

... the same Perl

... the same modules

Repeatable deployment

... the same Perl

... the same modules

... the same code

Repeatable deployment

... the same Perl

... the same modules

... the same code

... on demand

Easy...

If we have the right tools

Distro packages (?!)

(how much do you like your system perl?!)

We need something better

Let's be inspired by Larry

[larry hat pic]

YARRR!

Great hackers steal!

Great hackers steal ideas

python has virtualenv + pipruby has rvm + Bundler

We have Miyagawa

We have Kang-min Liu

We have Matt Trout

We have a community helping them

Repeatable deployment in five parts

Repeatable deployment in five parts

application-specific Perl

application-specific @INC path

versioned application code

versioned module dependencies

automate the previous four

Repeatable deployment in five parts

perlbrew

application-specific @INC path

versioned application code

versioned module dependencies

automate the previous four

Repeatable deployment in five parts

perlbrew

local::lib

versioned application code

versioned module dependencies

automate the previous four

Repeatable deployment in five parts

perlbrew

local::lib

git

versioned module dependencies

automate the previous four

Repeatable deployment in five parts

perlbrew

local::lib

git

carton

automate the previous four

Repeatable deployment in five parts

perlbrew

local::lib

git

carton

@&$%!

@&$%!

[swedish chef FAIL pic]

So I implemented it

In Ruby

After I learned some Ruby

Time for a demonstration

Our goal: deploy a “Hello World” Plack app

$ tree.├── Changes├── Makefile.PL├── app.psgi├── carton.lock├── cookbook│ └── hello-world│ ├── README.md│ ├── attributes│ │ └── default.rb│ ├── metadata.rb│ └── recipes│ └── default.rb└── lib └── ZZZ └── Hello └── World.pm

$ tree.├── Changes├── Makefile.PL├── app.psgi├── carton.lock├── cookbook│ └── hello-world│ ├── README.md│ ├── attributes│ │ └── default.rb│ ├── metadata.rb│ └── recipes│ └── default.rb└── lib └── ZZZ └── Hello └── World.pm

$ tree.├── Changes├── Makefile.PL├── app.psgi├── carton.lock├── cookbook│ └── hello-world│ ├── README.md│ ├── attributes│ │ └── default.rb│ ├── metadata.rb│ └── recipes│ └── default.rb└── lib └── ZZZ └── Hello └── World.pm

$ tree.├── Changes├── Makefile.PL├── app.psgi├── carton.lock├── cookbook│ └── hello-world│ ├── README.md│ ├── attributes│ │ └── default.rb│ ├── metadata.rb│ └── recipes│ └── default.rb└── lib └── ZZZ └── Hello └── World.pm

$ tree.├── Changes├── Makefile.PL├── app.psgi├── carton.lock├── cookbook│ └── hello-world│ ├── README.md│ ├── attributes│ │ └── default.rb│ ├── metadata.rb│ └── recipes│ └── default.rb└── lib └── ZZZ └── Hello └── World.pm

include_recipe 'carton'

package 'git-core'

git node['hello-world']['deploy_dir'] do repository node['hello-world']['deploy_repo'] reference node['hello-world']['deploy_tag'] notifies :restart, "carton_app[hello-world]"end

carton_app "hello-world" do perlbrew node['hello-world']['perl_version'] command "starman -p #{node['hello-world']['port']} app.psgi" cwd node['hello-world']['deploy_dir'] user node['hello-world']['user'] group node['hello-world']['group']end

carton_app "hello-world" do action :startend

include_recipe 'carton'

package 'git-core'

git node['hello-world']['deploy_dir'] do repository node['hello-world']['deploy_repo'] reference node['hello-world']['deploy_tag'] notifies :restart, "carton_app[hello-world]"end

carton_app "hello-world" do perlbrew node['hello-world']['perl_version'] command "starman -p #{node['hello-world']['port']} app.psgi" cwd node['hello-world']['deploy_dir'] user node['hello-world']['user'] group node['hello-world']['group']end

carton_app "hello-world" do action :startend

include_recipe 'carton'

package 'git-core'

git node['hello-world']['deploy_dir'] do repository node['hello-world']['deploy_repo'] reference node['hello-world']['deploy_tag'] notifies :restart, "carton_app[hello-world]"end

carton_app "hello-world" do perlbrew node['hello-world']['perl_version'] command "starman -p #{node['hello-world']['port']} app.psgi" cwd node['hello-world']['deploy_dir'] user node['hello-world']['user'] group node['hello-world']['group']end

carton_app "hello-world" do action :startend

include_recipe 'carton'

package 'git-core'

git node['hello-world']['deploy_dir'] do repository node['hello-world']['deploy_repo'] reference node['hello-world']['deploy_tag'] notifies :restart, "carton_app[hello-world]"end

carton_app "hello-world" do perlbrew node['hello-world']['perl_version'] command "starman -p #{node['hello-world']['port']} app.psgi" cwd node['hello-world']['deploy_dir'] user node['hello-world']['user'] group node['hello-world']['group']end

carton_app "hello-world" do action :startend

include_recipe 'carton'

package 'git-core'

git node['hello-world']['deploy_dir'] do repository node['hello-world']['deploy_repo'] reference node['hello-world']['deploy_tag'] notifies :restart, "carton_app[hello-world]"end

carton_app "hello-world" do perlbrew node['hello-world']['perl_version'] command "starman -p #{node['hello-world']['port']} app.psgi" cwd node['hello-world']['deploy_dir'] user node['hello-world']['user'] group node['hello-world']['group']end

carton_app "hello-world" do action :startend

Enough code... let's make it work

1. Set up a Vagrant virtual machine

2. Prepare Pantry

3. Get Hello World cookbook anddependencies

4. Configure Chef for Hello World

5. Deploy

1. Set up a Vagrant virtual machine

2. Prepare Pantry

3. Get Hello World cookbook anddependencies

4. Configure Chef for Hello World

5. Deploy

Vagrant is a tool for managing virtual machines

Vagrant is a tool for managing virtual machines

“Can I have a VirtualBox now, please?”

Vagrant is a tool for managing virtual machines

$ vagrant box add base \ http://files.vagrantup.com/lucid32.box

$ vagrant init

$ vagrant up

Chef brings a machine to a target state

Chef does pull

Chef Solo does push

Pantry is a tool for driving Chef Solo

Pantry is a tool for driving Chef Solo

$ pantry create node server.example.com

$ pantry apply node server.example.com \ --role web --recipe myapp

$ pantry sync node server.example.com

Finally, the demonstration...

http://goo.gl/LH4Hh

(Recorded live)

You can do this, too

Don't be afraid. Try it out. Get involved.

New!

perl-devops-subscribe@perl.org

Thank you

www.bunchmail.com