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nscd (13) Versions 4.0.0

Installs and configures nscd

Berkshelf/Librarian
Policyfile
Knife
cookbook 'nscd', '= 4.0.0'
cookbook 'nscd', '= 4.0.0', :supermarket
knife cookbook site install nscd
knife cookbook site download nscd
README
Dependencies
Changelog
Quality

nscd Cookbook

Build Status Cookbook Version

Installs and configures name service cache daemon (nscd). Provides a custom resource for clearing nscd database caches.

Requirements

Platforms

  • Debian 7+
  • Ubuntu 12.04+
  • RHEL/CentOS 5+
  • Fedora
  • SmartOS

Chef

  • Chef 12+

Cookbooks

  • compat_resource

Attributes

  • default['nscd']['package'] - nscd package name, defaults to nscd. Other variants include: unscd, gnscd
  • default['nscd']['version'] - nscd version, defaults to nil. If set to nil, the latest will be installed.

The following attributes affect configuration of /etc/nscd.conf.

  • default['nscd']['logfile']. Specifies name of the file to which debug info should be written. Default /var/log/nscd
  • default['nscd']['threads']. This is the number of threads that are started to wait for requests. At least five threads will always be created. Default 4
  • default['nscd']['max_threads']. Specifies the maximum number of threads. Default 32
  • default['nscd']['server_user']. If this option is set, nscd will run as this user and not as root. If a separate cache for every user is used (-S parameter), this option is ignored. Default nscd
  • default['nscd']['stat_user']. Specifies the user who is allowed to request statistics. Default root
  • default['nscd']['debug_level']. Sets the desired debug level. Default 0
  • default['nscd']['reload_count']. Limit on the number of times a cached entry gets reloaded without being used before it gets removed. Default 5
  • default['nscd']['paranoia']. Enabling paranoia mode causes nscd to restart itself periodically. Default no
  • default['nscd']['restart_interval']. Sets the restart interval to time seconds if periodic restart is enabled by enabling paranoia mode. Default 3600
  • default['nscd']['databases']. List of databases to configure. Default %[passwd group hosts services netgroup]

Each database has attributes, default depends on SERVICE, see attribute file.

  • default['nscd'][SERVICE]['enable_cache']. Enables or disables the specified SERVICE cache.
  • default['nscd'][SERVICE]['positive_time_to_live']. Sets the TTL (time-to-live) for positive entries (successful queries) in the specified cache for service. Value is in seconds. Larger values increase cache hit rates and reduce mean response times, but increase problems with cache coherence.
  • default['nscd'][SERVICE]['negative_time_to_live']. Sets the TTL (time-to-live) for negative entries (unsuccessful queries) in the specified cache for service. Value is in seconds. Can result in significant performance improvements if there are several files owned by UIDs (user IDs) not in system databases (for example untarring the Linux kernel sources as root); should be kept small to reduce cache coherency problems.
  • default['nscd'][SERVICE]['suggested_size']. This is the internal hash table size, value should remain a prime number for optimum efficiency.
  • default['nscd'][SERVICE]['check_files']. Enables or disables checking the file belonging to the specified service for changes. The files are /etc/passwd, /etc/group, /etc/hosts, /etc/services and /etc/netgroup.
  • default['nscd'][SERVICE]['persistent']. Keep the content of the cache for service over server restarts; useful when paranoia mode is set.
  • default['nscd'][SERVICE]['shared']. The memory mapping of the nscd databases for service is shared with the clients so that they can directly search in them instead of having to ask the daemon over the socket each time a lookup is performed.
  • default['nscd'][SERVICE]['max_db_size']. The maximum allowable size, in bytes, of the database files for the service.
  • default['nscd'][SERVICE]['auto_propagate']. When set to no for passwd or group service, then the .byname requests are not added to passwd.byuid or group.bygid cache. This can help with tables containing multiple records for the same ID. This option is valid only for services passwd and group.

Recipes

default

Installs nscd, manages the nscd service and makes available commands to clear the nscd databases (passwd and group) so they can be notified in other recipes (such as when managing openldap).

Custom Resources

clear_cache The clear_cache custom resource provides a simple way to clear the cache of 1 or more nscd databases from other recipes.

Actions

  • :clear: clears the nscd database cache

Properties

  • databases: Array of nscd databases (defaults to passwd group hosts services, and netgroup)

Examples

Clearing caches of passwd, and group databases

nscd_clear_cache 'clear-nscd-caches' do
  databases %w(passwd group)
end

Clearing caches of passwd, and group databases via notification so the databases are only cleared when another change is made.

nscd_clear_cache 'clear-nscd-caches' do
  databases %w(passwd group)
  action :nothing
end

template '/etc/nsswitch.conf' do
  notifies :run, 'nscd_clear_cache[clear-nscd-caches]', :immediately
end

Usage

If you're using nscd, add this recipe. If you need to clear database cache within other recipes using the nscd_clear_cache custom resource.

Note: Version 2.0 of this cookbook replaces notifying execute resource for clearing caches with the nscd_clear_cache custom resource.

License & Authors

Author:: Joshua Timberman (<joshua@chef.io>)

Copyright:: 2009-2016, Chef Software, Inc

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.

nscd Cookbook CHANGELOG

This file is used to list changes made in each version of the nscd cookbook.

v4.0.0 (2016-05-12)

  • The NSCD user / group is now set to nscd if the nscd user/group exist and if not it will run as nobody. This is most likely the desired behavior for users, but may be a surprise based on the previous behavior.

v3.0.0 (2016-04-29)

  • NSCD database values are now sanitized to remove incompatible databases on RHEL < 6 and Debian < 8. services and netgroup will now be removed as necessary

v2.0.0 (2015-10-24)

  • Breaking change: Changed the execute block for performing nscd database cache clears in wrapper cookbooks to a Chef 12.5 custom resource that can more easily clear the cache for multiple databases. This will require updating cookbooks that notified to the previous execute block and requires Chef 12.0 or greater.

v1.0.1 (2015-10-24)

  • Added additional platforms added to Test Kitchen config
  • Added the standard Chef Rubocop config
  • Updated Travis CI to use Chef DK for testing instead of Gems
  • Updated contributing and testing docs
  • Updated testing deps in the Gemfile
  • Added maintainers.toml and maintainers.md
  • Added a Rakefile for simplified testing
  • Updated links to the Github org to point to the new chef-cookbooks org

v1.0.0 (2015-09-05)

  • Minimum supported Chef release is now 11
  • Added default['nscd']['version'] to control the version of the nscd package to install
  • Removed use of Ruby 1.8.7 hash rockets
  • Added source_url and issue_url metadata
  • Added additional platforms to the Kitchen CI config
  • Removed Ruby 1.9.3 from Travis CI and add 2.1 and 2.2
  • Removed the version constraint on apt in the Berkshelf file
  • Updated developent dependencies and break Gemfile into groups
  • Added cookbook version badge to the readme

v0.13.0

  • Template the nscd config before starting the service so we don't have to start then restart
  • Added a chefignore file
  • Added Fedora as supported in metadata / Readme
  • Update testing and contributing docs to match JIRA-free process
  • Update development dependencies to current versions (chefspec, berkshelf, foodcritic, test kitchen, and rubocop)
  • Update chefspec / server spec to work with the newer releases
  • Add Trusty to the test kitchen config

v0.12.0

  • Manage /etc/nscd.conf with a template

v0.11.0

Improvement

  • COOK-3607 - Add support for different nscd packages

v0.10.0

Improvement

v0.9.0

Improvement

  • [COOK-1915] - Support SmartOS for nscd

v0.8.2

  • [COOK-1993] - use install action for packages

v0.7.0

  • Current public release

Foodcritic Metric
            

4.0.0 failed this metric

FC016: LWRP does not declare a default action: /tmp/cook/b8e5e2b15f6b779678ce64de/nscd/resources/clear_cache.rb:1