LOYM ENT
DEP ICS
TACT
Managing code from
development to production
Ian Barber - ian.barber@gmail.com
twitter.com/ianbarber | phpir.com

Image: http://flickr.com/photos/denisdervisevic/4527695803

- Table of Contents -
1.... Change Control
2.... Environments
3.... Version Control
4.... The Deploy Process
5.... Scripts
6.... Continuous Integration
7.... Remote Releases
8.... Packaged Releases
9.... Package Management
10.. Managing Hotfixes
11.. Managing Database Changes
12.. Rollbacks
13.. Tactical Deployment

Change control
plan execute
change change
identify
verify
need
close deliver

export copy to
code server
require compare
release md5
report restart
back apache

Change Request Form
Requested By: J. Teamlead Authorised By: S. Manager
Submit Date: 2011-01-27 Change Date: 2011-02-04
Reason For Change:
Resolve JIRA-1602 - Listen for new .com variants on vhost
Change Request:
Release tag 1.1.3 via normal process
mv /etc/httpd/conf.d/fooweb.conf /etc/httpd/conf.d/fooweb.old
mv ~releases/1.1.3/conf/fooweb.conf /etc/httpd/conf.d/
fooweb.conf
Verification:
http://foweb.com shows the same page as http://fooweb.com
Rollback:
Re-release 1.1.2
mv /etc/httpd/conf.d/fooweb.old /etc/httpd/conf.d/fooweb.conf

Environments
Production Development
static verbose
robust dynamic
reliable unstable
optimised experimental

on Envir onment
The Producti
Image: http://flickr.com/photos/lejoe/3763218501

The Staging Environment
Image: http://flickr.com/photos/simononly/4454401446

n Enviro nment
The Int egratio
Image: http://flickr.com/photos/unfoldedorigami/2374016430

The Developme
nt Environmen
t
Image: http://flickr.com/photos/drewnew/511936681

VERSION CONTROL
Image: http://flickr.com/photos/robbie73/4346732208

/branches/newpage /branches/...
/branches/search
/trunk
/branches/1.1.2 /tags/1.1.2

Development
/branches/newpage /branches/...
/branches/search
/trunk
Integration
/branches/1.1.2 /tags/1.1.2
Staging Production

master
release1.1.1
devel
search feature
long feature

Production
master
release1.1.1
Staging
devel
search feature Integration
long feature
Development

The DEPLoy PROCESS

The DEPLoy PROCESS
transparent flexible easy
scalable graceful reliable

support SMTP
process config
apache
vhost
app
update
code config
file perms
packages commands
libpng
update
cache restart
service service

code config package
repository repository repository
ta
da
server commands deployment
server
server controller

code config package
repository repository repository
da
ta
server commands deployment
server + data controller
server

BUILD SCRIPTS
#!/bin/bash
# Deployment script for FooWeb Project
git archive --format=tar
--remote=git://repo.com/myrepo/myrepo.git
HEAD -o fooweb.tar
tar -xf fooweb.tar /var/www
service httpd restart

#!/bin/bash
# Deployment script for FooWeb Project
svn export svn://localhost/fooweb-service/
trunk release
cd release && mkdir build
cp -r web/* build/
javac -cp /usr/share/java/servlet-api-2.5.jar
-d build/WEB-INF/classes
src/com/fooweb/service/*.java
cd build && jar cvf ../fooweb.war * && cd ../
# assumes autoDeploy is true
cp fooweb.war /var/lib/tomcat6/webapps

BUILDS TOOLS
tests release
code build docs
test
assets results

build
tools

<?xml version="1.0" encoding="UTF-8"?>
<project name="FooWeb">
<property name="install" location="/var/lib/
tomcat6/webapps" />
<property name="svn.repo" value="svn://
localhost/fooweb-service/trunk" />
<!--A "clean" target to delete compiled
files-->
<target name="clean">
<delete dir="build" />
<delete dir="release" />
<delete file="fooweb.war" />
</target>

<!-- Checkout, mkdir and compile-->
<target name="build">
<exec executable="svn">
<arg line="export ${svn.repo}
release" />
</exec>
<mkdir dir="build"/>
<copy todir="build">
<fileset dir="release/web" />
</copy>
<javac srcdir="release/src"
destdir="build/WEB-INF/classes/">
<classpath>
<pathelement path="/usr/share/
java/servlet-api-2.5.jar"/>
</classpath>
</javac>
</target>

<!-- Build our WAR file -->
<target name="war" depends="build">
<war destfile="fooweb.war" webxml="build/
WEB-INF/web.xml">
<fileset dir="build"/>
<classes dir="build/WEB-INF/classes"/>
</war>
</target>
<!-- Copy our file -->
<target name="deploy" depends="war">
<copy file="fooweb.war" todir="$
{install}" />
</target>
</project>

$ sudo ant deploy
Buildfile: build.xml
build:
[exec] Exported revision 8.
[mkdir] Created dir: /tmp/build
[copy] Copying 2 files to /tmp/build
[copy] Copied 3 empty directories to 1 empty
directory under /tmp/build
[javac] Compiling 1 source file to
/tmp/build/WEB-INF/classes
war:
[war] Building war: /tmp/fooweb.war
deploy:
[copy] Copying 1 file to /var/lib/tomcat6/
webapps
BUILD SUCCESSFUL Total time: 2 seconds

CONTINUOUS
INTEGRATION
Look at the
Hud son Wiki at
dson-ci.org
http://wiki.hu

<project name="Fooweb" default="build">
<target name="build" depends="phpunit" />
<target name="init">
<mkdir dir="${basedir}/build/logs" />
</target>
<target name="phpunit" depends="init">
<exec executable="phpunit"
dir="${basedir}/tests" failonerror="on">
<arg line=" --log-junit '${basedir}/
build/logs/phpunit.xml' --coverage-clover '$
{basedir}/build/logs/clover.xml' --coverage-
html '${basedir}/build/logs/coverage'" />
</exec>
</target>

<target name="phpcpd" depends="init">
<exec executable="phpcpd"
dir="${basedir}/application"
failonerror="on">
<arg line=" --log-pmd
'${basedir}/build/logs/php-cpd.xml' ." />
</exec>
</target>
</project>

REMOTE RELEASES
Image: http://flickr.com/photos/scragz/309353618

server server
authorized_keys authorized_keys
cp
ss
/s
h
/s
h
ss
cp
deployment
controller
id_rsa.pub
user “deploy” ssh-keygen -t rsa

Fabric
from fabric.api import * http://fabfile
.org
# Development environment
def dev():
env.user = 'deployer'
env.roledefs = {
"web" : ['localhost'],
"db" : ['localhost'],
}
# Production environment
def production():
env.user = 'deployer'
env.roledefs = {
"web" : ['primary.fooweb.com',
'secondary.fooweb.com'],
"db" : ['backend.fooweb.com'],
}

# Package up release - run local
def prepare_deploy():
local('svn export svn://localhost/fooweb/
trunk release')
with cd('release'):
local('tar cvzf ../fooweb.tar.gz .')
local('rm -rf release')
# Restart web server
@roles('web')
def restart_webserver():
sudo('/etc/init.d/apache2 restart')

# Deploy to remote servers
@roles('web')
def deploy():
prepare_deploy()
# in case of already existing
with settings(warn_only=True):
run('mkdir /tmp/release')
run('rm -rf /tmp/release/*')
put("fooweb.tar.gz", '/tmp/release')
with cd('/tmp/release'):
run("tar xvzf fooweb.tar.gz")
run("rm -rf fooweb.tar.gz")
run("mv * /tmp/test")
restart_webserver();
local("rm -rf fooweb.tar.gz");

$ fab dev deploy
[localhost] run: svn export svn://localhost/
fooweb/trunk release
[localhost] run: tar cvzf ../fooweb.tar.gz .
[localhost] run: rm -rf release
[localhost] run: mkdir /tmp/release
[localhost] err: mkdir: cannot create
directory `/tmp/release': File exists
Warning: run() encountered an error (return
code 1) while executing 'mkdir /tmp/release'
[localhost] run: rm -rf /tmp/release/*
[localhost] put: fooweb.tar.gz -> /tmp/
release/fooweb.tar.gz

[localhost] run: tar xvzf fooweb.tar.gz
[localhost] run: rm -rf fooweb.tar.gz
[localhost] run: mv * /tmp/test
[localhost] sudo: /etc/init.d/apache2 restart
Password for ianbarber@localhost:
[localhost] out: * Restarting web server
apache2
[localhost] out: ... waiting ...done.
[localhost] run: rm -rf fooweb.tar.gz
Done.
Disconnecting from localhost... done.

$ fab production deploy
[localhost] run: tar cvzf ../fooweb.tar.gz .
....
[primary.fooweb.com] run: rm -rf /tmp/release/
[localhost] run: tar cvzf ../fooweb.tar.gz .
....
[secondary.fooweb.com] run: mkdir /tmp/release
....
Disconnecting from secondary.fooweb.com...done
Disconnecting from primary.fooweb.com... done

$ mkdir config && cd config && capify .
[add] writing './Capfile'
[add] making directory './config'
[add] writing './config/deploy.rb'
[done] capified!
set :application, "set your application name "
set :repository, "set your repository"
set :scm, :subversion
role :web, "your web-server here"
role :app, "your app-server here"
role :db, "your primary db-server
here", :primary => true
Capi strano
role :db, "slave db" .com/
https:/ /github
capis trano/

set :application, "fooweb"
set :repository,"svn://localhost/fooweb/trunk"
set :scm, :subversion
set :scm_username, "deployment"
set :scm_password, "s3kkr3tp4a55"
set :scm_checkout, "export"
set :keep_releases, 4
set :normalize_asset_timestamps, false
set :deploy_to, "/usr/local/#{application}"
role :web, "primary.fooweb.com"
role :web, "secondary.fooweb.com"
role :db, "backend.fooweb.com"

namespace :deploy do
task :migrate do
# nothing
end
task :restart do
sudo "/etc/init.d/apache2 restart"
end
end
namespace :fooweb do
task :perms do
sudo "chmod -R a+w #{deploy_to}"
end
end
after "deploy:setup", "fooweb:perms"

$ cap deploy:setup
* executing `deploy:setup'
* executing
"sudo mkdir -p /usr/local/fooweb [...]"
servers: ["primary","secondary", "backend"]
[backend] executing command [...]
command finished
triggering after callbacks for deploy:setup
* executing `fooweb:perms'
* executing "sudo chmod -R a+w /usr/local/
fooweb"
servers: ["primary","secondary","backend"]
[primary] executing command [...]
command finished

$ cap deploy
* executing `deploy'
* executing `deploy:update'
** transaction: start
* executing `deploy:update_code'
executing locally: "svn info svn://
localhost/fooweb/trunk -rHEAD"
/usr/bin/svn
* executing "svn checkout -q -r17 svn://
localhost/fooweb/trunk /usr/local/fooweb/
releases/20110116192456 && (echo 17 > /usr/
local/fooweb/releases/20110116192456/
REVISION)"
servers: ["primary.fooweb.com"]
[primary.fooweb.com] executing command
[....]
* executing `deploy:finalize_update'
* executing "chmod -R g+w /usr/local/fooweb/

/usr/local/fooweb/
!"" current -> releases/20110116192316
!"" releases
# !"" 20110116190608
# # !"" application
# # !"" log -> /usr/local/fooweb/shared/log
# # !"" public
# # !"" REVISION
# # !"" tmp
# !"" 20110116192316
# # !"" application
# # !"" log -> /usr/local/fooweb/shared/log
# # !"" public
# # !"" REVISION
# # !"" tmp
$"" shared

Webistrano
https://g ithub.com/
perito r/webistrano

PACKAGED
RELEASES
Image: http://flickr.com/photos/halfbisqued/2353845688

Fooweb
Fooweb Fooweb
Mail Service
Any SMTP
Symfony 1.3 Tomcat 6.0
Server
PHP 5.2.12 Java 1.6

!"" application
# !"" controllers
# # $"" home.php
# $"" library
# $"" Foow
# $"" Router.php
!"" fooweb.spec
!"" public
# $"" index.php
$"" vhosts
$"" fooweb.conf

Summary: Fooweb Application
Vendor: Fooweb
Name: fooweb
Version: 1.0
Release: 1
Source0: fooweb-%{version}.tar.gz
License: BSD
Group: Fooweb
BuildArch: noarch
BuildRoot: %{_tmppath}/%{name}-%{version}-
buildroot
Requires: php
%description
This is the Fooweb web application
%prep
%setup

%install
mkdir -p $RPM_BUILD_ROOT/var/www/fooweb
mkdir -p $RPM_BUILD_ROOT/etc/httpd/conf.d/
cp -r application $RPM_BUILD_ROOT/var/www/fooweb
cp -r public $RPM_BUILD_ROOT/var/www/fooweb
cp vhosts/fooweb.conf $RPM_BUILD_ROOT/etc/httpd/
conf.d/
%clean
rm -rf $RPM_BUILD_ROOT
%files
%dir /var/www
%dir /var/www/fooweb
%config /etc/httpd/conf.d/fooweb.conf
/var/www/fooweb/*

~$ mkdir buildroot buildroot/tmp
~$ cat .rpmmacro
%packager Fooweb Release Manager
%_topdir ~/buildroot
%_tmppath ~/buildroot/tmp
~$ cd ~/tags
~/tags$ tar cvzf fooweb-1.0.tar.gz fooweb-1.0

~$ rpmbuild -ta fooweb-1.0.tar.gz
~$ rpm -qip ~/rpmbuild/RPMS/noarch/
fooweb-1.0-1.noarch.rpm
Name : fooweb
Relocations: (not relocatable)
Version : 1.0
Vendor: Fooweb
Release : 1
Build Date: Thu 13 Jan 2011 12:26:24 AM PST
Install Date: (not installed)
Build Host: ubuntu.localdomain
Group : Fooweb
Source RPM: fooweb-1.0-1.src.rpm
Size : 781
License : BSD
Signature : (none)
Summary : Fooweb Application
Description : This is the Fooweb web application

$ mkdir /var/www/repo
$ cd /var/www/repo
$ mkdir centox/5/fooweb/
{SRPMS,X86_64,i386,noarch}
$ cp ~rpmbuild/RPMS/noarch/* centos/5/fooweb/
noarch
$ cp ~rpmbuild/SRPMS/* centos/5/fooweb/SRPMS
$ createrepo -v centos/5/fooweb/noarch/
centos/5/fooweb/noarch/
!"" fooweb-1.0-1.noarch.rpm
$"" repodata
!"" filelists.xml.gz
!"" other.xml.gz
!"" primary.xml.gz
$"" repomd.xml

$ cat /etc/yum.repos.d/fooweb.repo
[fooweb_noarch]
name = Fooweb Private Repository
baseurl = http://fooweb.com/repo/centos/5/fooweb/
noarch
enabled = 1
gpgcheck = 0
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-
fooweb
$ yum update
fooweb_noarch 100% |========| 951 B
fooweb_noarch/primary 100% |========| 701 B
fooweb_noarch
1/1
Setting up Update Process
No Packages marked for Update

$ yum info fooweb
Available Packages
Name : fooweb
Arch : noarch
Version : 1.0
Release : 1
Size : 3.3 k
Repo : fooweb_noarch
Summary : Fooweb Application
License : BSD
Description: This is the Fooweb web application

<target name="buildrpm" depends="init">
<tar destfile="build/rpm/SOURCES/
fooweb.tar.gz" compression="gzip">
<tarfileset dir="${basedir}"
prefix="fooweb-1.0">
<include name="*/**" />
<exclude name="build/**" />
</tarfileset>
</tar>
<copy file="${basedir}/fooweb.spec" tofile="$
{basedir}/build/rpm/SPECS/fooweb.spec" />
<rpm command="-ba" specFile="fooweb.spec"
topDir="${basedir}/build/rpm"
cleanBuildDir="true" failOnError="true" />
</target>

PACKAGE
MANAGEMENT
Image: http://flickr.com/photos/southerncalifornian/2129676744

$ sudo aptitude install puppetmaster
0 packages upgraded, 10 newly installed, 0 to
remove and 76 not upgraded.
Need to get 3,233kB of archives. After unpacking
13.7MB will be used.
Puppet
http://puppetlabs.com
$ sudo aptitude install puppet
0 packages upgraded, 5 newly installed, 0 to
remove and 76 not upgraded.
Need to get 587kB of archives. After unpacking
1,892kB will be used.

backend
fooweb.com
primary
fooweb.com
seconday
fooweb.com
int
fooweb.com
staging
fooweb.com
Puppet
master

/etc/puppet
!"" auth.conf
!"" fileserver.conf
!"" manifests
# $"" site.pp
!"" modules
# !"" apache2
# # $"" manifests
# # $"" init.pp
# $"" fooweb
# !"" files
# # $"" fooweb.conf
# $"" manifests
# $"" init.pp
!"" puppet.conf
$"" templates

class fooweb {
package { "fooweb":
ensure => latest,
}
"
file { "/etc/apache2/sites-enabled/fooweb.conf":
owner => root,
group => root,
mode => 0444,
source =>
"puppet:///files/fooweb/files/fooweb.conf",
notify => Service["apache2"]
}
}
mod ules/fooweb
manif ests/init.pp

node "ubuntu.localdomain" { manifests/site.pp
include fooweb
include apache2
}
class apache2 {
service { apache2:
ensure => running
}
modules/apache2
manifests/init.pp

# puppet agent -o -v --no-daemonize
info: Caching catalog for ubuntu.localdomain
info: Applying configuration version '1295514488'
notice: /Stage[main]/Fooweb/Package[fooweb]/
ensure: ensure changed 'purged' to 'latest'
notice: /Stage[main]/Fooweb/File[/etc/apache2/
sites-enabled/fooweb.conf]/ensure: defined
content as '{md5}
d41d8cd98f00b204e9800998ecf8427e'
info: /Stage[main]/Fooweb/File[/etc/apache2/
sites-enabled/fooweb.conf]: Scheduling refresh of
Service[apache2]
notice: /Stage[main]/Apache2/Service[apache2]:
Triggered 'refresh' from 1 events
notice: Finished catalog run in 3.33 seconds
# ls /etc/httpd/conf.d/fooweb.conf
/etc/httpd/conf.d/fooweb.conf
# ls /var/www/fooweb/
application public

MANAGING HOTFIXES
Image: http://flickr.com/photos/moogan/8206134

/branches/1.1.3
/trunk
/tags/1.1.2 /tags/1.1.3

package
copy code
run db
backup
run db
changes
make code
active

package
copy code
run db
backup
run db
changes
make code
active

MANAGING Database
ChanGES
Image: http://flickr.com/photos/theplanetdotcom/4878814847

CREATE TABLE `blogpost` (
`id` int(11) auto_increment NOT NULL PRIMARY
KEY,
`title` VARCHAR(255),
`timestamp` DATETIME,
`content` TEXT
);
--//@UNDO
DBDeploy
tp://dbdeploy.com
DROP TABLE `blogpost`;
ht

ALTER TABLE `blogpost`
ADD `author` varchar(255) NULL;
--//@UNDO
ALTER TABLE `blogpost` DROP `author`;

$ wget http://dbdeploy.googlecode.com/files/
dbdeploy-dist-3.0M2-distribution.zip
CREATE TABLE changelog (
change_number BIGINT NOT NULL,
delta_set VARCHAR(10) NOT NULL,
start_dt TIMESTAMP NOT NULL,
complete_dt TIMESTAMP NULL,
applied_by VARCHAR(100) NOT NULL,
description VARCHAR(500) NOT NULL,
PRIMARY KEY(change_number, delta_set)
);

$ java -cp mysql-connector-java.jar:dbdeploy-
cli-3.0M2.jar com.dbdeploy.CommandLineTarget -
D com.mysql.jdbc.Driver -d mysql -o delta.sql
-u jdbc:mysql://localhost/foowebdb -U root -P
******
dbdeploy 3.0M2
Reading change scripts from directory
dbdeploy.
Changes currently applied to database:
(none)
Scripts available:
1, 2
To be applied:
1, 2

-- START CHANGE SCRIPT #1: 1-create-blogposts.sql
CREATE TABLE `blogpost` (
`id` int(11) auto_increment NOT NULL PRIMARY
KEY,
`title` VARCHAR(255),
`timestamp` DATETIME,
`content` TEXT
);
INSERT INTO changelog (change_number,
complete_dt, applied_by, description)
VALUES
(1, CURRENT_TIMESTAMP, USER(), '1-create-
blogposts.sql');
COMMIT;

-- END CHANGE SCRIPT #1: 1-create-blogposts.sql
-- START CHANGE SCRIPT #2: 2-add-author.sql
ALTER TABLE `blogpost` ADD `author` varchar(255)
NULL;
INSERT INTO changelog (change_number,
complete_dt, applied_by, description)
VALUES (2, CURRENT_TIMESTAMP, USER(), '2-add-
author.sql');
COMMIT;
-- END CHANGE SCRIPT #2: 2-add-author.sql

<?xml version="1.0" encoding="UTF-8"
standalone="no"?>
<databaseChangeLog [....]>
<changeSet author="ianbarber" id="1">
<createTable tableName="blogposts">
<column autoIncrement="true" name="id"
type="int(11)">
<constraints nullable="false"
primaryKey="true" />
</column>
<column name="title" type="varchar(255)" />
<column name="body" type="text" />
<column name="author" type="varchar(255)"/>
<column name="date" type="timestamp" />
</createTable>
</changeSet> Liquibase
ht tp://liquibase.org

<?xml version="1.0" encoding="UTF-8"
standalone="no"?>
<databaseChangeLog [....] >
<include file="v000/master.xml" />
</databaseChangeLog>
update.xml
<?xml version="1.0" encoding="UTF-8"
standalone="no"?>
<databaseChangeLog [....]>
<include file="v000/create-blog-
posts-1.xml" />
</databaseChangeLog>
v000/master.xml

$ wget http://downloads.sourceforge.net/
project/liquibase/Liquibase%20Core/2.0.0/
liquibase-2.0.0-bin.zip
# Liquibase properties
driver: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost/fooweb
classpath: /usr/share/java/mysql-connector-
java.jar
username: root
password: ******* roperties
liquibase.p

$ liquibase --changeLogFile=update.xml update
Liquibase Home: /opt/liquibase
INFO 1/18/11 1:32 PM:liquibase: Successfully
acquired change log lock
INFO 1/18/11 1:32 PM:liquibase: Reading from
`DATABASECHANGELOG`
INFO 1/18/11 1:32 PM:liquibase: Reading from
`DATABASECHANGELOG`
INFO 1/18/11 1:32 PM:liquibase: ChangeSet
v000/create-blog-posts-1.xml::1::ianbarber ran
successfully in 101ms
INFO 1/18/11 1:32 PM:liquibase: Successfully
released change log lock
Liquibase Update Successful

class CreateProjects < ActiveRecord::Migration
def self.up
create_table :projects do |t|
t.column :name, :string
t.column :description, :text
t.column :template, :string
t.column :created_at, :datetime
t.column :updated_at, :datetime
end
end
def self.down
drop_table :projects
end
end

ROLLING BACK
Image: http://flickr.com/photos/roolrool/4758613588

<?xml version="1.0" encoding="UTF-8"
standalone="no"?>
<databaseChangeLog [....]>
<changeSet author="ianbarber" id="2">
<addColumn tableName="blogposts">
<column name="commenter" type="varchar
(255)" />
</addColumn>
</changeSet>
</databaseChangeLog>
$ liquibase --changeLogFile=update.xml update
Liquibase Home: /opt/liquibase
INFO 1/18/11 2:38 PM:liquibase: ChangeSet v000/
add_commenter-2.xml::2::ianbarber ran
successfully in 136ms
Liquibase Update Successful

$ liquibase --changeLogFile=update.xml
rollbackCount 1
Liquibase Home: /opt/liquibase
INFO 1/18/11 2:39 PM:liquibase: Successfully
acquired change log lock
INFO 1/18/11 2:39 PM:liquibase: Reading from
`DATABASECHANGELOG`
INFO 1/18/11 2:39 PM:liquibase: Rolling Back
Changeset:v000/add_commenter-2.xml::
2::ianbarber::(Checksum:
3:cc45ae1014b26f8b35cb70a5fc39a1ae)
INFO 1/18/11 2:39 PM:liquibase: Successfully
released change log lock
Liquibase Rollback Successful

TACTICAL
DEPLOYMENTS
Image: http://flickr.com/photos/romainguy/230416692

E.G. mk_
Primary slave_de
http://bi lay
DB t.ly/hDW
DFi
Replication
read
read slave
slave
30 Minute
Backup
Delay

namespace :deploy do
namespace :web do
task :disable, :roles => :web do
on_rollback {
rm "#{shared_path}/system/maintenance.html"
}
require 'erb'
deadline, reason = ENV['DATE'], ENV['WHY']
maintenance = ERB.new(
File.read("./templates/maintenance.erb"
)).result(binding)
put maintenance,
"#{shared_path}/system/maintenance.html",
:mode => 0644
end
end

# DATE="16:00 MST" WHY="a database upgrade"
cap deploy:web:disable
if (-f $document_root/system/maintenance.html)
{
rewrite ^(.*)$ /system/maintenance.html last;
break;
}

warm redirect
caches &
sessions links
proxies
migrate

developers
devops
sys
QA
admins

See : Continuous
Deplo yment In 5
Easy Steps
http://o reil.ly/13EPgd
Image: http://flickr.com/photos/jurvetson/3961794276

Feature F
la gs
Image: http://flickr.com/photos/rossharmes/4153769740

Gradual Ramp
With Feature Without Feature
100%
75%
50%
25%
0%
Day 1 Day 2 Day 3 Day 4

Dark Lau
nches

THanks!
Deployment Tactics: Managing
code from development to
production
Ian Barber - ian.barber@gmail.com
twitter.com/ianbarber | phpir.com