Description

The CouchDB Cookbook is a library cookbook that provides custom resources for use in recipes, designed to install and configure Apache CouchDB 2.x from source, optionally enabling full-text search capabilities.

It includes reference examples illustrating how to install and configure a standalone CouchDB server, or a full cluster of joined CouchDB server nodes.

Platform Support

The following platforms have been tested with Test Kitchen:

• CentOS 7.3
• Debian 7.11 (wheezy), 8.7 (jessie)
• Ubuntu 14.04 (trusty), 16.04 (xenial)

Partial support is provided for the following platforms:

• Debian 9.x (stretch) - search not yet supported
• Ubuntu 17.10 (artful) - search not yet supported

Pull requests to add support for other platforms are most welcome.

NOTE: This recipe cannot automatically install JDK 6 for Debian 8 and Ubuntu 16. Please ensure this prerequisite is managed by roles preceeding this one for your nodes if you wish to enable fulltext search ability.

Examples

The test cookbooks under test/cookbooks/couchdb-wrapper-test/recipes/ include worked examples of how to include the CouchDB resources in your own cookbooks. Here are a few excerpts.

Standalone (single-node) CouchDB

For a single CouchDB server, use the couchdb_node resource once:

couchdb_node 'couchdb' do
  admin_username 'admin'
  admin_password 'password'
  type 'standalone'
end

The fulltext true attribute can be added to enable full-text search functionality.

Clustered CouchDB nodes

All nodes in the cluster must have the same uuid, cookie, admin_username and admin_password.

It is recommended to pre-generate the UUID and place it in your cookbook. The following one-liner will generate a CouchDB UUID:

python -c "import uuid;print(uuid.uuid4().hex)"

Further, if you want session cookies from one node to work on another (for instance, when putting a load balancer in front of CouchDB) the hashed admin password must match on every machine as well. There are many ways to pre-generate a hashed password. One way is by downloading and extracting CouchDB's source code, changing into the dev/ directory, and running the following one-liner, replacing MYPASSWORD with your desired password:

sudo pip install simple-pbkdf2
python -c 'import uuid;from pbkdf2 import pbkdf2_hex;password="MYPASSWORD";salt=uuid.uuid4().hex;iterations=10;print("-pbkdf2-{},{},{}".format(pbkdf2_hex(password,salt,iterations,20),salt,iterations))'

Place this hashed password in your recipe, cookbook, data bag, encrypted data bag, vault, etc.

For each machine to run a CouchDB clustered node, use a block of the form:

uuid = <uuid_goes_here>

couchdb_node 'couchdb' do
  type 'clustered'
  uuid uuid
  cookie 'henriettapussycat'
  admin_username 'admin'
  admin_password 'password'
end

A single node in the cluster must also include the couchdb_setup_cluster resource. DO NOT run this resource on all nodes in the cluster.

The couchdb_setup_cluster resource uses Chef Search to determine which nodes to include in the cluster. By default, it searches for nodes with the role specified in the role attribute. If desired, the search string can be completely overridden with the search_string attribute.

Additionally, the number of nodes expected to be retrieved from Chef Search must be specified in the num_nodes attribute. This prevents prematurely finalising cluster setup before all nodes have been converged by Chef.

This example joins exactly 3 nodes with the role my_couchdb_role into a cluster:

couchdb_setup_cluster 'doit' do
  admin_username 'admin'
  admin_password 'password'
  role 'my_couchdb_role'
  num_nodes 3
end

Development "3-in-1" server

For development purposes, it is often useful to run a 3-node cluster on a single machine to ensure that applications correctly respond to cluster-like CouchDB behaviour. The recipe test/cookbooks/couchdb-wrapper-test/recipes/three-nodes-from-source.rb is a full example of how this can be done, and is used by Test Kitchen in the verification of this cookbook.

Requirements

• Chef 12 or higher
• Network-accessible package repositories
• EPEL repositories on RHEL platforms

Platform:

• ubuntu (>= 14.04)
• debian (>= 7.0)
• amazon (>= 7.0)
• centos (>= 7.0)
• oracle (>= 7.0)
• redhat (>= 7.0)
• scientific (>= 7.0)
• zlinux (>= 7.0)

Cookbooks:

• build-essential
• compat_resource
• erlang
• poise-python
• yum-epel
• java
• maven

Attributes

• node['couch_db']['src_version'] - Apache CouchDB version to download. Defaults to 2.1.1.
• node['couch_db']['src_mirror'] - Apache CouchDB download link. Defaults to https://archive.apache.org/dist/couchdb/source/#{node['couch_db']['src_version']}/apache-couchdb-#{node['couch_db']['src_version']}.tar.gz.
• node['couch_db']['src_checksum'] - sha256 checksum of Apache CouchDB tarball. Defaults to d5f255abc871ac44f30517e68c7b30d1503ec0f6453267d641e00452c04e7bcc.
• node['couch_db']['install_erlang'] - Whether CouchDB installation will install Erlang or not. Defaults to true.
• node['couch_db']['configure_flags'] - CouchDB configure options. Defaults to -c.
• node['couch_db']['dreyfus']['repo_url'] - Full-text search: dreyfus repository URL. Defaults to https://github.com/cloudant-labs/dreyfus.
• node['couch_db']['dreyfus']['repo_tag'] - Full-text search: dreyfus repository tag or hash. Defaults to d83888154be546b2826b3346a987089a64728ee5.
• node['couch_db']['clouseau']['repo_url'] - Full-text search: clouseau repository URL. Defaults to https://github.com/cloudant-labs/clouseau.
• node['couch_db']['clouseau']['repo_tag'] - Full-text search: clouseau repository tag or hash. Defaults to 32b2294d40c5e738b52b3d57d2fb006456bc18cd.
• node['maven']['version'] - Full-text search: Maven version for CouchDB full-text search. 3.2.5 or earlier REQUIRED. Defaults to 3.2.5.
• node['maven']['url'] - Full-text search: URL to Apache Maven download. Defaults to https://dist.apache.org/repos/dist/release/maven/maven-3/3.2.5/binaries/apache-maven-3.2.5-bin.tar.gz.
• node['maven']['checksum'] - Full-text search: Apache Maven tarball sha256 checksum. Defaults to 8c190264bdf591ff9f1268dc0ad940a2726f9e958e367716a09b8aaa7e74a755.
• node['maven']['m2_home'] - Full-text search: Location of m2 home. Defaults to /opt/maven.
• node['couch_db']['enable_search'] - INTERNAL: Set to true by resource provider if search is enabled. Defaults to false.

Recipes

• couchdb::compile - INTERNAL USE ONLY.
• couchdb::prereq - INTERNAL USE ONLY.

couchdb::compile

INTERNAL USE ONLY. Downloads and compiles CouchDB from source.

couchdb::prereq

INTERNAL USE ONLY. Creates directories, users, and installs runtime and build prerequisites for CouchDB when installing from source.

Resources

• couchdb_clouseau - This creates and destroys a CouchDB Clouseau (search) node, and is automatically invoked by the couchdb_node resource.
• couchdb_node - This creates a CouchDB node, either standalone or as part of a cluster.
• couchdb_setup_cluster - Optional role to join all nodes in the cluster together.

couchdb_clouseau

This creates and destroys a CouchDB Clouseau (search) node, and is automatically invoked by the couchdb_node resource. There is no need to include this resource directly in your wrapper cookbook.

Actions

• create: Create the CouchDB Clouseau node. Default action.

Attribute Parameters

• bind_address: The address on which the clouseau service will bind. Defaults to "127.0.0.1".
• index_dir: The directory in which the clouseau service will store its indexes. Defaults to "default".
• cookie: The Erlang cookie with which the clouseau service will join the cluster. Defaults to "monster".

couchdb_node

This creates a CouchDB node, either standalone or as part of a cluster.

Actions

• create: Create the CouchDB node. Default action.

Attribute Parameters

• bind_address: The address to which CouchDB will bind. Defaults to "0.0.0.0".
• port: The port to which CouchDB will bind the main interface. Defaults to 5984.
• local_port: The port to which CouchDB will bind the node-local (backdoor) interface. Defaults to 5986.
• admin_username: The administrator username for CouchDB. In a cluster, all nodes should have the same administrator.
• admin_password: The administrator password for CouchDB. In a cluster, all nodes should have the same administrator.
• uuid: The UUID for the node. In a cluster, all node UUIDs must match. Auto-generated if not specified.
• cookie: The cookie for the node. In a cluster, all node cookies must match. Defaults to "monster".
• type: The type of the node - standalone or clustered. Defaults to "clustered".
• loglevel: The logging level of the node. Defaults to "info".
• config: A hash specifying additional settings for the CouchDB configuration ini files. The first level of the hash represents section headings. The second level contains key-pair values to place in the ini file. See test/cookbooks/couchdb-wrapper-test/recipes/one-node-from-source.rb for more detail. Defaults to {}.
• fulltext: Whether to enable full-text search functionality or ont. Defaults to false.
• extra_vm_args: Additional Erlang launch arguments to place in the vm.args file. Can be used to specify inet_dist_listen_min, inet_dist_listen_max and inet_dist_use_interface options, for example.

Examples

# Standalone node with full-text search enabled.
couchdb_node 'couchdb' do
  admin_username 'admin'
  admin_password 'password'
  fulltext true
  type 'standalone'
end

couchdb_setup_cluster

Optional role to join all nodes in the cluster together.

NOTE: Intended to be run on a SINGLE NODE IN THE CLUSTER. Adding this to the run list of more than one node in the cluster will result in undefined, probably WRONG behaviour.

Through the use of the address and port options, this resource can be run on any Chef-managed machine. It does not have to run on a CouchDB node.

Operators can also avoid this role and manage cluster membership and finalisation outside of Chef.

Actions

• create: Default action.

Attribute Parameters

• address: The CouchDB address through which cluster management is performed. Defaults to "127.0.0.1".
• port: The port for the CouchDB address through which cluster management is performed. Defaults to 5984.
• admin_username: The administrator username for CouchDB. In a cluster, all nodes should have the same administrator.
• admin_password: The administrator password for CouchDB. In a cluster, all nodes should have the same administrator.
• role: The role to which all nodes in the cluster should belong. Used with Chef Search to retrieve a current list of node addresses and ports. Defaults to "couchdb".
• search_string: Override of the default roles:<role> Chef Search expression. Modify this if you need to build a list of nodes in the cluster via different search terms. Defaults to "default".
• num_nodes: Required. Number of nodes the Chef Search should return. Ensures that all nodes have been provisioned prior to joining them into a cluster.
• node_list: Optional array of [address, port] pairs representing all nodes in the cluster. If a static list is specified here, it will override the Chef Search. Only these nodes will be joined into the cluster. Only use this as a last resort. Example: [['127.0.0.1', 15984], ['127.0.0.1', 25984], ['127.0.0.1', 35984]]. Defaults to [].

License and Maintainer

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

• Author: Joan Touzet ([email protected])
• Previous Authors:
  • Joshua Timberman ([email protected])
  • Matthieu Vachon ([email protected])

Copyright 2014-2017, Joan Touzet; Copyright 2009-2014, Opscode, Inc.