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chef_client_updater (62) Versions 2.0.1

Upgrades chef-client to specified releases

cookbook 'chef_client_updater', '= 2.0.1', :supermarket
cookbook 'chef_client_updater', '= 2.0.1'
knife supermarket install chef_client_updater
knife supermarket download chef_client_updater
Quality 100%


Build Status Cookbook Version

This cookbook updates the chef-client



  • All platforms with a chef-client package on


  • Chef 11.6.2+


This cookbook provides both a custom resource and a default recipe. The default recipe simply uses the custom resource with a set of attributes. You can add chef_client_updater::default to your run list or use the custom resource in a wrapper cookbook.

Init System Caveats

When Chef runs as a service under a system init daemon such as Sys-V or systemd each chef run forks off from the main chef-client process being managed by the init system. For a chef-client upgrade to occur the running chef-client as well as the parent process must be killed, and a new chef-client must start using the updated binaries. This cookbook handles killing the chef-client, but your init system must properly handle starting the service back up. For systemd and upstart this can be handled via configuration, and chef-client cookbook 8.1.1 or later handles this by default. This functionality is not available in sys-v (RHEL 6, Debian 7, and others), so you will need to employ a secondary process such as a monitoring system to start the chef-client service.

Updating Windows Nodes

There are a couple of considerations on Windows that have to be dealt with. The Chef Client installer uses a custom component to speed up the installation. This component does not gracefully handle open file handles the way the MSI installer does. To work around this, the resource moves the currently installed Chef Client to a staging directory and that clears the way for the newer installer to run. At the end of that installation process though, that Chef Client run must exit or it will fail trying to find files that do not exist in their expected locations. The next run of the Chef Client will use the newly installed version.

Running Chef Client as a Scheduled Task

If you run as a scheduled task, then this will work smoothly. The path to the newly installed Chef Client will be the same and the scheduled task will launch it. Part of this resource's job on the next run is to make sure the staging directory with the older client is removed.

Running Chef Client As A Windows Service

If you run Chef Client as a service, things get a tiny bit more complicated. When the new installer runs, the service is removed. This isn't a big deal if you've got the chef-client cookbook set to configure the Windows service. If that is the case, we can register a scheduled task to run shortly after the chef_client_updater terminates the current chef run. An example recipe might look like:

if Chef::VERSION < node['my_update_cookbook']['desired_version']
  run_chef_task_in_ten_minutes = + 600

  windows_task 'chef-client-upgrade' do
    cwd 'C:\\opscode\\chef\\bin'
    command 'chef-client'
    run_level :highest
    frequency :once
    start_time "#{run_chef_task_in_ten_minutes.hour}:#{run_chef_task_in_ten_minutes.min}"
    action :create
  windows_task 'chef-client-upgrade' do
    cwd 'C:\\opscode\\chef\\bin'
    command 'chef-client'
    run_level :highest
    frequency :once
    start_time "#{run_chef_task_in_ten_minutes.hour}:#{run_chef_task_in_ten_minutes.min}"
    action :delete

chef_client_updater 'Install latest Chef' do
  post_install_action 'kill'

Upgrading from Chef 11

Moving from Chef 11 has a few challenges when we are dealing with public update sources. Chef 11 ships with a very old cacert.pem. To work through this, we need to get a more current cacert.pem file and point OpenSSL to it. Unfortunately, for this to work consistently on Windows, we'll need to reboot. Chef 11 does not have the reboot resource, so this isn't a graceful process. However, on the next Chef run after the reboot, things will be back on track and the upgrade will perform as on other platforms.

Below is an example of a recipe that can set up Chef 11 to work using public update sources.

if platform_family?('windows') && (Chef::VERSION < '12')
  new_cert_file = File.join(ENV['USERPROFILE'], 'cacert.pem')

  remote_file new_cert_file do
    source ''
    action :create

  powershell_script 'restart' do
    code <<-EOH
    restart-computer -force
    action :nothing

  env 'SSL_CERT_FILE' do
    value new_cert_file
    notifies :run, 'powershell_script[restart]', :immediately

chef_client_updater 'Install latest Chef' do
  post_install_action 'kill'



Installs the mixlib-install/mixlib-install gems and upgrades the chef-client.


  • channel - The chef channel you fetch the chef client from. stable contains all officially released chef-client builds where as current contains unreleased builds. Default: stable
  • prevent_downgrade - Don't allow this cookbook to downgrade the chef-client version. Default: true
  • version - The version of the chef-client to install. Default :latest
  • post_install_action - After installing the chef-client what should we do. exec to exec the new client or kill to kill the client and rely on the init system to start up the new version. Default: exec
  • exec_command - The chef-client command. default: $PROGRAM_NAME.split(' ').first
  • exec_args - An array of arguments to exec the chef-client with. default: ARGV
  • download_url_override - The direct URL for the chef-client package.
  • checksum - The SHA-256 checksum of the chef-client package from the direct URL.


chef_client_updater 'Install latest'
chef_client_updater 'Install latest Chef 13.x' do
  version '13'
chef_client_updater 'Install 12.13.36 and kill' do
  version '12.13.36'
  post_install_action 'kill'

License & Authors

Copyright:: 2016-2017, 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

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.

chef_client_updater Cookbook CHANGELOG

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

2.0.1 (2017-06-16)

  • Add information on upgrading Windows nodes and upgrading from Chef 11 to the readme

2.0.0 (2017-06-15)

  • The custom resource has been converted to a LWRP so that we can support Chef Client updates from chef-client 11.6.2 to current. This also removes the need for the compat_resource cookbook.
  • Support for upgrading Windows clients has been added
  • A potential infinite loop in the upgrade process has been fixed
  • The existing /opt/chef directory will now be cleaned up before the reinstall so leftover files will not carry over during upgrades
  • Full Travis testing of the cookbook has been added

1.1.1 (2017-05-11)

  • Fix the initial load of mixlib-install failing

1.1.0 (2017-05-10)

  • Add support for download URL overrides via new properties on the resource and attributes for the default recipe. This requires mixlib-install 3.2.1, which we now ensure we install in the updater resource.
  • Update the default post_install action in the recipe to match the resource (exec).
  • Remove usage of class_eval in the resource since we use compat_resource and class_eval causes issues with some later Chef 12 releases.
  • Fix the solaris platform name in the metadata.rb.
  • Remove disabling FC016 and FC023 Foodcritic rules as these no longer alert.
  • Avoid infinite loops if trying to install the latest chef-client version from any channel.
  • Add a true test recipe and remove unused inspec tests
  • Add debug logging of the current vs. desired versions to help troubleshooting
  • Added a blurb in the readme outlining init system issues surrounding kill and the chef-client starting back up

1.0.2 (2017-04-07)

  • Fix Chef 13 compatibility by using Kernel.exec not exec

1.0.1 (2017-04-07)

  • point the URLs at the new project repo
  • Add ChefSpec matcher


  • Initial release of chef_client_updater

Collaborator Number Metric

2.0.1 passed this metric

Contributing File Metric

2.0.1 passed this metric

License Metric

2.0.1 passed this metric

Testing File Metric

2.0.1 passed this metric

Version Tag Metric

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