CKAN overview

Open source data catalog
An overview of CKAN
Augusto Herrmann
Open Knowledge Brazil

IV Moscow Urban Forum
CKAN Overview | Augusto Herrmann
Topics covered in this presentation
• Introduction
○ what is CKAN
○ who uses it
○ feature tour
• Features of CKAN
• Data publishing
2
• Under the hood
○ installation and maintenance
• Site administration
• Directions (where to find stuff)

Time constraints
• pick and choose topics accordingly
• I’ll be quick, but will address questions
3
by Moyan Brenn

4
First, a quick poll
•who is familiar with
○ the concepts of open data
○ browsing open data catalogs
○ including data in CKAN catalogs
○ installing CKAN
○ developing / theming CKAN
y sean dreilinger

What is it?
Comprehensive
Knowledge
Archive
Network
by degreezero2000
6

What is it?
An open source software for open data catalogs
by Steven de Costa
7

What is it?
Affero GPL 3 Licence
● if you offer it as software-as-a-
service (SaaS), you also have
to make source code available
https://github.com/ckan/ckan
more than 7 years old
more than 80 developers
8

What is it?
● stores metadata, not data itself
(in principle)
● makes it easy to find data
● keep handy documentation about data
by Reeding Lessons
9

What is it?
● data must be available on the internet
in a permanent URL
○ directly linkable
by Dave Winer
10

What is it?
● data must be available on the internet
in a permanent URL
○ no captcha!
byLuChOeDu
11

What is it?
● structured data
○ no tables inside pdf or doc
■ common offenders: statistic bulletins,
official press
○ no tables as images
by Petras Gagilas
12

What is it?
● open formats
○ common formats: csv, json, xml, rdf
● open licences
○ “Open data and content can be freely
used, modified, and shared by anyone
for any purpose” - opendefinition.org
○ examples: CC 4.0, ODbL, OGL
by Jonathan Grey
13

Who makes it?
● Open Knowledge
http://okfn.org
http://br.okfn.org
● Community of developers
http://github.com/ckan/ckan
● Governance: CKAN Association
http://ckan.org/about/association
14

Who uses it?
● national governments
● local and regional
governments
● parliaments
● civil society
(e.g. community instances)
● research institutions
(open research data)
more at: http://ckan.org/instances
16

Who uses it?
National govenments

data.gov.uk
18
United Kingdom
Source code:
https://github.
com/datagovuk

data.gov
19
USA

dados.gov.br
20
Brazil
Source code:
http://dev.dados.gov.
br/codigo/dev/tema-ckan

and many other countries
21
● Argentina
● Australia
● Austria
● Canada
● Germany
● Iceland
● Ireland
● Italia
● Japan
● Mexico
● Netherlands
● Norway
● Romania
● Slovakia
● Sweden
● Switzerland
● Uruguay
Riley Kaminer

dados.recife.pe.gov.br
23
Recife, PE, Brazil
Source code:
http://dados.recife.pe.gov.
br/source/ckan_dados_recife_20140828.zip

data.rio.rj.gov.br
24
Rio de Janeiro, RJ,
Brazil

datapoa.com.br
25
Porto Alegre, RS,
Brazil

data.buenosaires.gob.ar
26
Buenos Aires,
Argentina

opendata.caceres.es
27
Cáceres, Spain

data.kk.dk
28
Copenhagen,
Denmark

Who uses it?
Community instances

datahub.io
30
Open Knowledge

hubofdata.ru
31
OpenGovData.ru

Internationalization (i18n)
● available in 53 languages
● languages with 99% or more complete
in version 2.2:
○ bulgarian
○ catalan
○ czech
○ dutch
○ french
○ finnish
○ german
○ italian
○ japanese
○ norweigan
○ portuguese (br)
○ spanish
○ swedish
32
by Eric Andresen

Russian localization
● 92% completed for version 2.2
● translation of version 2.3 will soon begin
● join the localization team:
○ collaborative translation platform - Transifex
○ https://www.transifex.com/projects/p/ckan/language/ru/
33

Catalog and search data
● catalog through the web interface,
using the API or harvesting tools
● search all metadata fields
● faceted search
○ organization, tag,
format, license
● data is sorted out as “datasets”
and “resources”
35

Find related data
● related or similar resources
are registered in the same
dataset (e.g. same data, but
different format; same data,
but for differing time periods,
etc.)
36

Find relevant metadata
● title
● description
● unique identifier
● author and maintainer
● license
● website or source page for the data
● groups, tags, organizations
● format (for the resource)
● other (including custom ones)
37

Preview data
● preview a sample of the resource
as a table, chart, map, etc.
● interactive - e.g. tables are sortable
by column, axes in charts can
be configured to any column, etc.
● uses the recline.js data visualization
library
38

Preview data
39

Handle geospatial data
● through the ckanext-spatial extension
● visualize geo data in a map
(e.g. contours of plazas and parks)
● search for data inside a user-defined
bounding box selectable by the user
in a search query
40

See a dataset’s change history
● track changes to a dataset
● see who did what and when
41

Sort out datasets by organization
● each organization can
manage their own data
in the catalog and authorize
users who can edit
● gets their own page in the
catalog with visibility for the
data they publish
● is also a facet available
for search
42

Sort out datasets into groups
● another way to link related
datasets
● useful for thematic
classification
● is also a facet available for
search
43

Sort out datasets into tags
● free-form user (editor) defined tags
● also for searching
44

Custom themes
● simple customization (colors, layout of main page, portal title, etc.) can be made
through the user interface by the site administrator
● for deeper customization, use the extension programming interface (Python) and
develop custom templates (Jinja2)
45

Extensible
● programming interface
for creating extensions
● extension repository
extensions.ckan.org
● has many extensions with
varying degrees of
maturity
46
James Petts

FileStore and DataStore
● built-in extensions
● FileStore: allow for uploading files and
store them in CKAN, instead of just
linking to a URL
● DataStore: allow for querying data through
an API, even “joining” data from different
resources
○ also comes with the DataPusher service,
which updates the DataStore on each
file registered
47
DRs Kulturarvsprojekt

Harvesting
● metadata can be harvested from another portal by using the etension ckanex-harvest
● in (configurable) time, data newly catalogued or modified in the source will show up in
the harvesting portal
48
by Martin Pettitt

Feedback
● there are extensions for users
to comment in a specific dataset
● stimulates discussion about and
improvement of data
49

Access by API
● uses http requests (pseudo-RESTful)
● consumes and returns metadata in JSON format
● you can do programmatically any operation you can do
using the UI (e.g., searching)
● by using an access key on the API you can
overcome access throttling limitations
and also do any of the same read and write operations
your user is allowed to do via UI
● useful for processing and cataloguing data in great
volumes (e.g. apply a fix to many datasets in a batch,
include many similar resources in a dataset, etc.)
50
by Andrea Vallejos

Datasets and resources
● resources can be data files, API entry points, query examples, extended data
documentation, etc.
● a resource has exactly one format and URL
● datasets can have one or more resources
● as a general guideline, can be catalogued under the same dataset:
○ resources that are representations of the same data in various formats
○ resources that are about the same data but in different time periods
○ resources that are about the same data but in different regional spans
52

Datasets and resources
● a dataset has
○ a single source (URL for a source page of the data)
○ a single license
○ a single author
○ a single maintainer
○ a single (or none) organization
○ a set of groups that applies to the whole dataset
○ a set of tags that applies to the whole dataset
53

Organizations
● only organization editors (or admins)
can create datasets in it
● users can create datasets in any
organizations for which they are editors
● organization admins can invite existing
or new users for the organization and
assign them a role (member, editor or
administrator)
54

Creating a new dataset
● Click “add a new dataset”
○ on the dataset search screen; or
○ on the organization screen for an organization for which you are an editor
or admin
55

Creating a new dataset
● CKAN will ask for the following basic metadata:
○ title
○ description
○ tags
○ license
○ organization (if you’re editor on
more than one organization)
● when finished, click “Next: add data”
to include resources
56

Including resources
● select “link to file”, “link to an API” or “upload a file” (in case FileStore is
enabled)
● type in name, description and format
● if you have other resources to include,
select “save & add another”
● after including all resources, click
“next: additional info”
57

Additional dataset information
● “visibility”: “public” can be seen by any site visitor; “private” means visible to
members of the organization only
● “author” / “author e-mail”: person or organization responsible for producing
the data
● “maintainer” / “maintainer e-mail”: person or organization technically
responsible for keeping data available
● optional custom fields
● press “finish” to create the dataset
58

Under the hood
BiblioArchives / LibraryArchives

System Architecture
• Usually sits alongside a CMS (e.g. Drupal or Wordpress)
• WGSI Application pluggable to Apache (modwsgi), to nginx, etc.
• PostgreSQL database (metadata, access control, etc.)
• Apache Solr (for indexing and searching)
• Other components (depending on the installed and in-use extensions)
60

Installing CKAN
• Supported operating system:
• Other possible OS’s:
○ Debian
○ CentOS
○ Red Hat
○ Windows (version 1.8 of CKAN)
http://www.hackneyworkshop.com/2012/03/30/ckan-on-windows/
○ OS X
61

Installing CKAN
• Types of installation
○ Ubuntu 12.04 64-bit server package
○ source code
○ using Docker
62

Package install
● Requirements: Ubuntu 12.04 64-bit server
●installs CKAN and DataPusher (for DataStore)
●Steps:
1. Install the CKAN package and its
dependencies
2. Install PostgreSQL and Solr
3. Restart Apache and Nginx
sudo apt-get update
sudo apt-get install -y nginx apache2
libapache2-mod-wsgi libpq5
wget http://packaging.ckan.org/python-
ckan_2.2_amd64.deb
sudo dpkg -i python-ckan_2.2_amd64.deb
sudo apt-get install -y postgresql
solr-jetty
sudo service apache2 restart
sudo service nginx restart
63

Source code install
● sequence of commands depend on operating system
○ detailed instructions for each are available in:
https://github.com/ckan/ckan/wiki/How-to-Install-CKAN
1. install dependency packages
2. install CKAN packages into a Python virtualenv
3. configure Postgres database
4. create a CKAN configuration file (production.ini)
5. configure Solr
6. create database tables
7. configure DataStore (optional)
8. link to who.ini (Repoze.who configuration file)
64

Docker install
● Requirement: have Docker installed and
configured
● set of 3 commands
● Docker downloads images automatically (can
take a long time)
$ docker run -d --name db
ckan/postgresql
$ docker run -d --name solr ckan/solr
$ docker run -d -p 80:80 --link db:db
--link solr:solr ckan/ckan
65

Initial configuration
• Create a site administrator user
paster sysadmin add seanh -c
/etc/ckan/default/production.ini
• Create other users if necessary
• Edit production.ini (for instance to configure the site name)
ckan.site_title = Open data portal
66

Other maintenance commands
• Rebuild search index
paster --plugin=ckan search-index rebuild --
config=/etc/ckan/std/std.ini
• Create and remove users
paster --plugin=ckan user add exampleuser --
paster --plugin=ckan user remove exampleuser --
67

Simple customization
http://<my-ckan-url>/ckan-admin/config/
● some simple customization changes
can be made through the UI
by the site administrator
○ site title and description
○ color scheme
○ intro text, about text and others
○ custom css
69

User registration
● by default, user self-registration
is enabled
● to disable (e.g. to avoid spam),
change a flag in .ini file
ckan.auth.create_user_via_web = False
70

Registering new groups and organizations
● by default, creating new
organizations is enabled for all editors
● to disable, change a flag in .ini file
ckan.auth.user_create_organizations = False
● likewise, the same for groups
● note: site admin can always create
groups and organizations regardless
71

Manage users
● look for user in
http://<my-ckan-url>/user/
● when logged in as admin, you
see a “manage” button under
the user profile
● admin can edit profile, change
passwords or delete the user
72

Documentation
http://docs.ckan.org
There are specific manuals
for specific audiences:
● End user (editor)
● Site administrator
● Maintainer
74

Documentation
Also manuals for specific subjects:
● API guide
● Extending guide
● Theming guide
● Contributing guide
by John Haslam
75

Where to get help
On mailing lists:
● CKAN Global User Group
https://groups.google.com/forum/#!forum/ckan-global-user-group
● ckan-dev
https://lists.okfn.org/mailman/listinfo/ckan-dev
by Upupa4me
76

Where to get help
On IRC chat:
server: irc.freenode.net
channel: #ckan
by Garry Knight
77

Where to get help
Paid support:
● hosting with a SLA
● deployment and maintenance
● support, consultancy,
training
by glasseyes view
78

Where to try CKAN
demo.ckan.org
● free for experimentation, cataloguing data
and getting to know CKAN
● content is periodically wiped out
by Horia Varlan
79

Where to register datasets
datahub.io
● community instance
● as an individual, if you
don’t have you own
CKAN, this is an option
● e.g. data that has been
cleaned up as
result of a hackathon
80

Questions?
thank you
спасибо
augusto@okfn.org.br
augusto.herrmann@planejamento.gov.br

CKAN overview

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