Pallet Gogrid

8/8/2019 Pallet Gogrid

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build your environments

in the cloud with pallet@tbatchelli

a.k.a. @disclojure

Oct 28, 2010

Thursday, October 28, 2010


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what

a provisioning and

configuration tool for thecloud

(and other places too)



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how

jclouds by Adrian Cole - Create/destroynodes/services in the cloud.

- http://www.jclouds.org

pallet by Hugo Duncan - Manage andconfigure your nodes in a sane way.

- http://hugoduncan.github.com/pallet/

http://hugoduncan.github.com/pallet/http://www.jclouds.org/http://hugoduncan.github.com/pallet/http://hugoduncan.github.com/pallet/http://www.jclouds.org/http://www.jclouds.org/


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pallets goals

Use the same configuration of computenodes from development to production

Reuse of configuration artifacts by

composition and reuse (as opposed to copy

+modify)

Leverage SCM systems to store the historyof setups

Bring software engineering practices to



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No central server

No agents on nodes

Works with standard (or custom) images

First-class support for complex multi-service configurations

All node configuration done remotely viagenerated scripts over SSH

DSL for generating scripts, resources

Testable



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crates

Pallets basic configuration unit

A crate is a grouping of functions

Functions usually:- manipulate/create internal representations

- result in resources deployed or scripts being runin the target nodes



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proxied

bootstrap

automatedadmin user

tomcat

java tomcat

tomcat

deploy

reverse

proxy

haproxy

Custom Crates

Standard Crates



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proxied node(core/defnodeproxied"Basicwebapp,servedbytomcat"

{:os-family:ubuntu

:os-description-matches"10.04"

:inbound-ports[808022]}:bootstrap(resource/phase(crates/bootstrap))

:configure(resource/phase(crates/tomcat))

:deploy(resource/phase

(crates/tomcat-deploy"webapp.war"))

:restart-tomcat(resource/phase

(service/service"tomcat6"

:action:restart)))



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{:os-family:ubuntu








:action:restart)))



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{:os-family:ubuntu








:action:restart)))



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jclouds instantiates one node (if needed)

Pallet:- Sets up an admin user, and exchanges SSH keys so that

you can login via SSH

-Installs tomcat, and all the necessary dependencies (e.g.

java)

- Deploys the designated webapp on tomcat- Starts tomcat

(converge{proxied1}

:computeservice

:phase:deploy)



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How to deal withmulti-service setups?



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well use this example

http://github.com/hugoduncan/pallet-examples

haproxy

proxy

tomcat

proxied

webapp

http://github.com/hugoduncan/pallet-exampleshttp://github.com/hugoduncan/pallet-examples


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multi-service config

(pallet.core/converge

{proxied10haproxy1}

:computeservice

:phase:deploy)



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two-phase model1. Invoke: for each phase (bootstrap,

configure, deploy, etc...), on all nodes of

each tag, call the crates. This generates:

- An intermediate representation of boththe particular and the global configuration- A list of the tasks to perform to setup the

nodes up to that configuration level needed

2. Execute all listed tasks based on the final

configuration created in the previous step



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the invoke step

haproxycrate- Schedules the creation its configuration based on the

info about the proxied nodes found in the intermediatemodel.

Notice that at this point the proxied info might not yet known

Notice that the actual creation of the configuration will bedone in the next step

proxied crate- for every proxied node it will create an entry in theintermediate model



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the execute step

builds the actual files and scripts to becreated and executed, based on theintermediate model

Executes the scripts on the node via ssh,move files, etc...



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{ { debconf-set-selections /etc/haproxy/haproxy.cfg.new


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reuse crates in allcycles of your app



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development

haproxy

proxied

DB



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QA

haproxy

proxied

DB

haproxy

proxied



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integration tests

haproxy

DB

proxied proxied

DB



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production

haproxy

proxied

haproxy

proxiedproxiedproxiedproxiedproxied

DBDB



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thank you

please visit- www.pallet.org- www.jclouds.org

- #pallet on IRC- #jclouds on IRC- @hugoduncan on twitter

- @jclouds on twitter- and of course you can find everyting clojure in

www.disclojure.org
http://www.jclouds.org/http://www.pallet.org/http://www.disclojure.org/http://www.disclojure.org/http://www.jclouds.org/http://www.jclouds.org/http://www.pallet.org/http://www.pallet.org/

Documents

Pallet Gogrid