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DEPLOYING.md

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Deployment

This is a step by step guide covering all the necessary steps to deploy CKAN using custom template on a new machine.

The guide will try to cover all Linux-based operating systems, but some commands might be specific to Ubuntu and its derivatives. However, links containing further information were added in order to simplify the installation process on other operating systems as well.

Installation

Dependencies

  • A GNU/Linux operating system with good internet connectivity.
  • Unrestricted access to external domains, such as GitHub, DockerHub, etc.
  • git, docker-engine (docker) and docker-compose

First we need to install git and docker-compose (docker-compose should already have docker as dependency. If this is not the case follow the official documentation on installing docker):

sudo apt-get update
sudo apt-get install git docker-compose build-essential

Then start and enable the docker service and verify operation

sudo systemctl start docker
sudo systemctl enable docker
sudo docker info

Note: In case you need to use your local county mirrors as pip registry please set pip index URL:

export PIP_INDEX_URL=<<https://local-mirror-url.xy>>

Extra dependencies

  • You will also need a SMTP server and its credentials for CKAN to work properly. This will not obstacle deployment, CKAN will be up and running, but won't be able to send emails (e.g. on password reset). You will be asked to provide SMTP server credentials while running make secret script, see below.

Source files and configuration

Now we have the runtime, next we need to download the cluster configuration files and build the services.

Navigate to where you want the source files to live on your server (e.g. /opt) and clone the repository:

cd /opt
git clone https://github.com/ViderumGlobal/ckan-cloud-docker.git
cd ckan-cloud-docker

Environment variables

To create or update files with secrets and env vars run and follow all steps:

make secret

Traefik proxy service

Traefik is the entry point from the outside world. It binds to the default HTTP (80) and HTTPS (443) ports and handles requests by forwarding them to the appropriate services within the stack. In our case, it will point to Nginx serving the CKAN web app.

Traefik will set up SSL for the website. There are two ways of doing this:

  1. By having a provided certificate we need to install
  2. By obtaining and installing a Let's Encrypt certificate
Install a provided certificate

To install an existing SSL certificate we need to use the traefik/traefik_custom_ssl.toml file. Make sure this file is the one mounted in the Traefik container, and not the default (which will attempt to obtain a Let's Encrypt certificate, see next step).

The certificate chain and private key need to be copied in the traefik/certs directory using these exact names:

  • domain.cert for the certificate [chain] of the domain
  • domain.key for the private key

Modifying these names is possible by also altering the traefik.toml configuration file. This might be needed for installing multiple certificates, for example (subdomains, alternate TLDs etc.).

Set up Let's Encrypt

Traefik needs strict permissions in order to run Let's Encrypt (more info):

chmod 600 traefik/acme.json

Finally, edit traefik/traefik.toml file

vim traefik/traefik.toml

Traefik will attempt to obtain a Let's Encrypt SSL certificate. In order for this to happen, the following configuration items need to be filled in:

IMPORTANT: Use FQDN for both ‘main’ and ‘rule’ entries.

This is the contact email for Let's Encrypt

  • main = "example.com" This is the domain for which Let's Encrypt will generate a certificate for

In addition to SSL specific configuration, there is one more line you need to adjust:

  • rule = "Host:example.com" This is the domain name that Traefik should respond to. Requests to any other domain not configured as a Host rule will result in Traefik not being able to handle the request.

Note: All the necessary configuration items are marked with TODO flags in the traefik.toml configuration file.

This should be enough for the basic installation. In case you need to tweak versions or other initialization parameters for CKAN, you need these two files:

  • docker-compose/ckan-conf-templates/{instance-id}-theme-ckan.ini This is the file used to generate the CKAN main configuration file.

  • .docker-compose.{instance-id}-theme.yaml This is the file that defines the services used by this instance.

Running

To run the instance:

sudo make start O=<<instance-id>>

To stop it, run:

sudo make stop O=<<instance-id>>

To destroy the instance, run:

sudo make down O=<<instance-id>>

To destroy the instance, together with volumes, databases etc., run:

sudo make remove_volumes O=<<instance-id>>

If you want to tweak the source files, typically you need to destroy the instance and run it again once you're done editing. The choice of removing the volumes in the process is up to you.

Migrate Data

Migrate Database

You will need public URLs to database dumps.

DB_DUMP_URL=<<DB_DUMP_URL.gz>>
DATASTORE_DB_DUMP_URL=<<DATASTORE_DB_DUMP_URL.gz>>

sudo make shell O=<<instance-id>> S=ckan C='bash migrate_databases.sh $(DB_DUMP_URL) $(DATASTORE_DB_DUMP_URL)'

Migrate files

For ckan-cloud devops only - Migrate data from ckan-cloud cluster to object store server (Eg: AWS S3):

# Grab the minio-mc pod name
kubectl get pods -n ckan-cloud | grep minio-mc
# SSH into the pod
kubectl exec -it minio-mc-xya-abc -n ckan-cloud sh
# Add minio server to hosts
mc config host add exporter https://host.ckan.io <<access-key>> <<secret-key>>
# Add client minio server to hosts
mc config host add receiver https://host.client.io <<reciever-access-key>> <<reciever-secret-key>>
# Depending on instance, some paths can be set to public download:
mc policy download prod/ckan/<<instance-id>>/*
# Make sure client server has bucket init with proper permissions. (IAM user owning credentials should have full access over bucket)
# Migrate data
mc cp --recursive exporter/ckan/<<instance-id>> receiver/<<bucket-name>>

Download the data to file system and mount on ckan persistent volumes:

HOST=<<FileStorage Server>>
ACCESS_KEY=<<Access Key>>
SECRET_KEY=<<Secret Key>>
BUCKET=<<Bucket Name>>
STORAGE_PATH=<<Storage Path>>

bash migrate_filestorage.sh $HOST $ACCESS_KEY $SECRET_KEY $BUCKET $STORAGE_PATH

Repopulate search index

After migration rebuild the SOLR search index.

sudo make shell O=<<instance-id>> S=ckan C='/usr/local/bin/ckan-paster --plugin=ckan search-index rebuild  -c /etc/ckan/ckan.ini'

Debugging

To check all the logs at any time:

sudo make logs O=<<instance-id>>

To check the logs for a specific service:

sudo make logs O=<<instance-id>> S=<<Service Name>>

(exit the logs by pressing Ctrl+C at any time)

To get inside a running ckan container

sudo make shell O=<<instance-id>> S=<<Service Name>> C=<<command>>

Note: for some services (Eg: Nginx) you mite need to use C=sh instead of c=bash

Creating the sysadmin user

In order to create organizations and give other user proper permissions, you will need sysamin user(s) who has all the privileges. You can add as many sysadmin as you want. To create sysamin user:

# Create user using paster CLI tool
sudo make user O={instance-id} U={username} P={password} E={email}

# Example
sudo make user O=panama U=ckan_admin P=123456 [email protected]

You can also give sysadmin role to the existing user.

sudo make sysadmin O=panama U=ckan_admin

Sysadmin Control Panel

Here you can edit portal related configuration, like website title, site logo or add custom styling. Login as sysadmin and navigate to ckan-admin/config page and make changes you need. Eg: https://demo.ckan.org/ckan-admin/config

Installing and enabling a new extension

CKAN allows installing various extensions (plugins) to the existing core setup. In order to enable/disable them you will have to install them and include into the ckan config file.

To install extension you need to modify POST_INSTALL section of ckan service in .docker-compose.{instance-id}-theme.yaml. Eg to install s3filestore extension

POST_INSTALL: |
  install_standard_ckan_extension_github -r datopian/ckanext-s3filestore &&\

And add extension to the list of plugins in docker-compose/ckan-conf-templates/{instance-id}-theme-ckan.ini.template

# in docker-compose/ckan-conf-templates/{instance-id}-theme-ckan.ini.template
ckan.plugins = image_view
   ...
   stats
   s3filestore

Note: depending on extension you might also need to update extensions related configurations in the same file. If needed this type of information is ussually included in extension REAMDE.

# in docker-compose/ckan-conf-templates/{instance-id}-theme-ckan.ini.template
ckanext.s3filestore.aws_access_key_id = Your-Access-Key-ID
ckanext.s3filestore.aws_secret_access_key = Your-Secret-Access-Key
ckanext.s3filestore.aws_bucket_name = a-bucket-to-store-your-stuff
ckanext.s3filestore.host_name = host-to-S3-cloud storage
ckanext.s3filestore.region_name= region-name
ckanext.s3filestore.signature_version = signature (s3v4)

In order to disable extension you can simple remove it from the list of plugins. You will probably also want to remove it from POST_INSTALL part to avoid redundant installs, although this is not must.