Common CKAN Administrator Tasks

The majority of common CKAN administration tasks are carried out using the paster script.

Paster is run on the command line on the server running CKAN. This section covers:

Understanding Paster

At its simplest, paster commands can be thought of like this:

paster <ckan commands>

But there are various extra elements to the commandline that usually need adding. We shall build them up:

Enabling CKAN commands

Paster is used for many things aside from CKAN. You usually need to tell paster that you want to enable the CKAN commands:

paster --plugin=ckan <ckan commands>

You know you need to do this if you get the error Command 'user' not known for a valid CKAN command.

(Alternatively, CKAN commands are enabled by default if your current directory is the CKAN source directory)

Pointing to your CKAN config

Paster needs to know where your CKAN config file is (so it knows which database and search index to deal with etc.):

paster --plugin=ckan <ckan commands> --config=<config file>

If you forget to specify --config then you will get error AssertionError: Config filename '/home/okfn/development.ini' does not exist.

(Paster defaults to looking for development.ini in the current directory.)

For example, to initialise a database:

paster --plugin=ckan db init --config=/etc/ckan/std/std.ini

Virtual environments

You often need to run paster within your CKAN virtual environment (pyenv). If CKAN was installed as ‘source’ then you can activate it as usual before running the paster command:

. ~/pyenv/bin/activate
paster --plugin=ckan db init --config=/etc/ckan/std/std.ini

The alternative, which also suits a CKAN ‘package’ install, is to simply give the full path to the paster in your pyenv:

/var/lib/ckan/std/pyenv/bin/paster --plugin=ckan db init --config=/etc/ckan/std/std.ini

Running Paster on a deployment

If CKAN is deployed with Apache on this machine, then you should run paster as the same user, which is usually www-data. This is because paster will write to the same CKAN logfile as the Apache process and file permissions need to match.

For example:

sudo -u www-data /var/lib/ckan/std/pyenv/bin/paster --plugin=ckan db init --config=/etc/ckan/std/std.ini

Otherwise you will get an error such as: IOError: [Errno 13] Permission denied: '/var/log/ckan/std/std.log'.

Getting Help on Paster

To get a full list of paster commands (i.e. including CKAN commands):

paster --plugin=ckan --help

And to get more detailed help on each command (e.g. on db):

paster --plugin=ckan --help db

Paster executable

It is essential to run the correct paster. The program may be installed globally on a server, but in nearly all cases, the one installed in the CKAN python virtual environment (pyenv) is the one that should be used instead. This can be done by either:

  1. Activating the virtual environment:

    . pyenv/bin/activate
    
  2. Giving the path to paster when you run it:

    pyenv/bin/paster ...
    

Position of Paster Parameters

The position of paster parameters matters.

--plugin is a parameter to paster, so needs to come before the CKAN command. To do this, the first parameter to paster is normally --plugin=ckan.

Note

The default value for --plugin is setup.py in the current directory. If you are running paster from the directory where CKAN’s setup.py file is located, you don’t need to specify the plugin parameter..

Meanwhile, --config is a parameter to CKAN, so needs to come after the CKAN command. This specifies the CKAN config file for the instance you want to use, e.g. --config=/etc/ckan/std/std.ini

Note

The default value for --config is development.ini in the current directory. If you are running a package install of CKAN (as described in Option 1: Package Installation), you should explicitly specify std.ini.

The position of the CKAN command itself is less important, as longs as it follows --plugin. For example, both the following commands have the same effect::

paster --plugin=ckan db --config=development.ini init
paster --plugin=ckan db init --config=development.ini

Running a Paster Shell

If you want to run a “paster shell”, which can be useful for development, then the plugin is pylons. e.g. paster --plugin=pylons shell.

Often you will want to run this as the same user as the web application, to ensure log files are written as the same user. And you’ll also want to specify a config file (note that this is not specified using the --config parameter, but simply as the final argument). For example:

sudo -u www-data paster --plugin=pylons shell std.ini

Common Tasks Using Paster

The following tasks are supported by paster.

create-test-data Create test data in the database.
db Perform various tasks on the database.
ratings Manage the ratings stored in the db
rights Commands relating to per-object and system-wide access rights.
roles Commands relating to roles and actions.
search-index Creates a search index for all datasets
sysadmin Gives sysadmin rights to a named user
user Manage users

For the full list of tasks supported by paster, you can run:

paster --plugin=ckan --help

create-test-data: Create test data

As the name suggests, this command lets you load test data when first setting up CKAN. See Load Test Data for details.

db: Manage databases

Lets you initialise, upgrade, and dump the CKAN database.

Initialisation

Before you can run CKAN for the first time, you need to run “db init” to create the tables in the database and the default authorization settings:

paster --plugin=ckan db init --config=/etc/ckan/std/std.ini

If you forget to do this then CKAN won’t serve requests and you will see errors such as this in the logs:

ProgrammingError: (ProgrammingError) relation "user" does not exist

Cleaning

You can delete everything in the CKAN database, including the tables, to start from scratch:

paster --plugin=ckan db clean --config=/etc/ckan/std/std.ini

The next logical step from this point is to do a “db init” step before starting CKAN again.

Dumping and Loading databases to/from a file

You can ‘dump’ (save) the exact state of the database to a file on disk and at a later point ‘load’ (restore) it again, or load it on another machine.

To write the dump:

paster --plugin=ckan db dump --config=/etc/ckan/std/std.ini std.pg_dump

To load it in again, you first have to clean the database of existing data (be careful not to wipe valuable data), followed by the load:

paster --plugin=ckan db clean --config=/etc/ckan/std/std.ini std.pg_dump
paster --plugin=ckan db load --config=/etc/ckan/std/std.ini std.pg_dump

The pg_dump file notes which PostgreSQL user ‘owns’ the data on the server. Because the PostgreSQL user (by default) is identified as the current Linux user, and this is setup to be ckanINSTANCE where INSTANCE is the name of the CKAN instance. This means if you want to restore the pg_dump as another CKAN instance name (often needed if you move it to another server) then you will need to change the database owner - see Editing the database ownership.

Upgrade migration

When you upgrade CKAN software by any method other than the package update described in Option 1: Package Installation, before you restart it, you should run ‘db upgrade’, which will do any necessary migrations to the database tables:

paster --plugin=ckan db upgrade --config=/etc/ckan/std/std.ini

Creating dump files

For information on using db to create dumpfiles, see Database Dumps.

ratings: Manage dataset ratings

Manages the ratings stored in the database, and can be used to count ratings, remove all ratings, or remove only anonymous ratings.

For example, to remove anonymous ratings from the database:

paster --plugin=ckan ratings clean-anonymous --config=/etc/ckan/std/std.ini

rights: Set user permissions

Sets the authorization roles of a specific user on a given object within the system.

For example, to give the user named ‘bar’ the ‘admin’ role on the dataset ‘foo’:

paster --plugin=ckan rights make bar admin package:foo  --config=/etc/ckan/std/std.ini

To list all the rights currently specified:

paster --plugin=ckan rights list --config=/etc/ckan/std/std.ini

For more information and examples, see Set and Manage Permissions.

roles: Manage system-wide permissions

This important command gives you fine-grained control over CKAN permissions, by listing and modifying the assignment of actions to roles.

The roles command has its own section: see Set and Manage Permissions.

search-index: Rebuild search index

Rebuilds the search index. This is useful to prevent search indexes from getting out of sync with the main database.

For example:

paster --plugin=ckan search-index rebuild --config=/etc/ckan/std/std.ini

This default behaviour will clear the index and rebuild it with all datasets. If you want to rebuild it for only one dataset, you can provide a dataset name:

paster --plugin=ckan search-index rebuild test-dataset-name --config=/etc/ckan/std/std.ini

Alternatively, you can use the -o or –only-missing option to only reindex datasets which are not already indexed:

paster --plugin=ckan search-index rebuild -o --config=/etc/ckan/std/std.ini

If you don’t want to rebuild the whole index, but just refresh it, use the -r or –refresh option. This won’t clear the index before starting rebuilding it:

paster --plugin=ckan search-index rebuild -r --config=/etc/ckan/std/std.ini

There are other search related commands, mostly useful for debugging purposes:

search-index check                  - checks for datasets not indexed
search-index show {dataset-name}    - shows index of a dataset
search-index clear [dataset-name]   - clears the search index for the provided dataset or for the whole ckan instance

sysadmin: Give sysadmin rights

Gives sysadmin rights to a named user. This means the user can perform any action on any object.

For example, to make a user called ‘admin’ into a sysadmin:

paster --plugin=ckan sysadmin add admin --config=/etc/ckan/std/std.ini

user: Create and manage users

Lets you create, remove, list and manage users.

For example, to create a new user called ‘admin’:

paster --plugin=ckan user add admin --config=/etc/ckan/std/std.ini

To delete the ‘admin’ user:

paster --plugin=ckan user remove admin --config=/etc/ckan/std/std.ini