Chef Fix for ( WARNING: No knife configuration file found )

if the command (knife client list) fails with this error:

WARNING: No knife configuration file found
WARN: Failed to read the private key /etc/chef/client.pem: #

make sure you downloaded the chef-repo and configured knife.rb file which looks like this:

current_dir = File.dirname(__FILE__)
log_level                :info
log_location             STDOUT
node_name                "admin"
client_key               "#{current_dir}/admin.pem"
validation_client_name   "org-validator"
validation_key           "#{current_dir}/org-validator.pem"
chef_server_url          "https://server_domain_or_IP/organizations/org"
syntax_check_cache_path  "#{ENV['HOME']}/.chef/syntaxcache"
cookbook_path            ["#{current_dir}/../cookbooks"]

also make sure you are at the chef-repo directory, running the command from another directory will give you the same error.

check this guide to learn how to setup and configure chef workstation :

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-chef-12-configuration-management-system-on-ubuntu-14-04-servers