Most Useful Chef Commands

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Dear Readers,

In this article,we will see Most useful Chef Commands.

SNO	USE	COMMAND
1	Download Chef package from chef official website	wget https://packages.chef.io/files/stable/chef-workstation/0.13.35/el/7/chef-workstation-0.13.35-1.el7.x86_64.rpm
2	Install Chef package	yum install chef-workstation-0.13.35-1.el7.x86_64.rpm -y
3	Verify Chef Pacakge	which chef
4	See the version	chef -v or chef –version
5	Create a cookbook	chef generate cookbook <cookbook name> chef generate cookbook ktexperts-cookbook
6	Create a recipe	chef generate recipe <recipe name> chef generate recipe ktexperts-recipe
7	Verify ruby script	chef exec ruby -c <cookbook name>/recipes/<recipe name> chef exec ruby -c ktexperts-cookbook/recipes/ktexperts-recipe.rb
8	Run chef-client Locally	sudo chef-client -zr “recipe[<cookbook name>::<recipe name]” sudo chef-client -zr “recipe[ktexperts-cookbook::ktexperts-recipe]”
9	Get IP Address from Ohai store	ohai ipaddress
10	Get hostname from Ohai store	ohai hostname
11	Get memory/total from ohai store	ohai memory/total
12	Get cpu/0/mhz from ohai store	ohai cpu/0/mhz
13	Run List (Each recipe from each cookbook only)	sudo chef-client -zr “recipe[<cookbook name>::<recipe name>],recipe<cookbook name>::<recipe name>]” sudo chef-client -zr “recipe[ktexperts-apache-cookbook::ktexperts-apache-recipe],recipe[ktexperts-cookbook::ktexperts-recipe]”
14	Include_recipe (Run multiple recipes from same cookbook)	sudo chef-client -zr “recipe[<cookbook name>::default]” sudo chef-client -zr “recipe[ktexperts-apache-cookbook::default]”
15	Combine Run List and Include_recipe (Run any number of recipes from any number of cookbooks)	sudo chef-client -zr “recipe[<first cookbook name>],recipe[<second cookbook name>]” sudo chef-client -zr “recipe[ktexperts-apache-cookbook],recipe[ktexperts-cookbook]”
16	verify the connection between Workstation and Chef Server	knife ssl check (Be inside chef-repo)
17	Bootstrap a node	knife bootstrap <node-private IP> –ssh-user ec2-user –sudo -i <node-pem key> -N <Any node name> knife bootstrap 172.31.35.120 –ssh-user ec2-user –sudo -i chef.pem -N node1
18	Verify Nodes	knife node list
19	Upload cookbook to Chef Server	knife cookbook upload <cookbook name> knife cookbook upload ktexperts-apache-cookbook
20	See the list of cookbooks	knife cookbook list
21	Attach recipe to node	knife node run_list set <node-name> “recipe[<cookbook name>::<recipe name>]” knife node run_list set node1 “recipe[ktexperts-apache-cookbook::ktexperts-apache-recipe]”
22	Verify the recipe added to the node or not	knife node show <node-name> knife node show node1
23	Automate the chef-client (Add in node)	vi /etc/crontab * * * * * root chef-client
24	Automate the chef-client (Add in user data)	#!/bin/bash sudo sudo yum update -y echo “* * * * * root chef-client” >> /etc/crontab
25	Create a role	vi roles/ktexperts-web.rb name ‘ktexperts-web’ description “ktexperts web server role” run_list “recipe[<cookbook name>::<recipe name]”,”recipe[<cookbook name>::<recipe name]”,”recipe[<cookbook name>]” run_list “recipe[ktexperts-apache-cookbook::ktexperts-apache-recipe]”,”recipe[ktexperts-apache-cookbook::ktexperts-sample-recipe]”,”recipe[ktexperts-apache-cookbook]”
26	Upload role to chef server	knife role from file roles/<role-name> knife role from file roles/ktexperts-web.rb
27	Attach node to Role	knife node run_list set <node-name> “role[<role-name>]” knife node run_list set node1 “role[ktexperts-web]”
28	Verify the node added to the roles or not	knife node show <node-name> knife node show node1
29	Upload all cookbooks to Chef Server	knife cookbook upload –all
30	See the list of Clients	knife client list
31	See the list of Roles	knife role list
32	Delete cookbooks from chef server	knife cookbook delete <cookbook name> knife cookbook delete ktexperts-apache-cookbook
33	Delete nodes from chef server	knfie node delete <node name> knfie node delete <node1>
34	Delete roles from chef server	knife role delete <role name> knife role delete ktexperts-web.rb
35	Delete clients from chef server	knife client delete <client name> knife client delete node1

Ruby Script for Single Resource

SNO	ACTION	SCRIPT
1	Create a file	file ‘ktexperts-file1’ do content ‘Ktexperts is a knowledge sharing platform’ action :create end
2	Install package	package ‘tree’ do action :install end
3	Create a web server	package ‘tree’ do action :install end file ‘/var/www/html/index.html’ do content “Ktexperts is a knowledge sharing platform” action :create end service ‘httpd’ do action [ :enable, :start ] end
4	Update the configuration information	file ‘/robofile’ do content “This is to get Attributes HOSTNAME: #{node[‘hostname’]} IPADDRESS: #{node[‘ipaddress’]} CPU: #{node[‘cpu’][‘0’][‘mhz’]} MEMORY: #{node[‘memory’][‘total’]}” owner ‘root’ group ‘root’ action :create end
5	Create a user	user ‘ramesh’ do action :create end
6	Create a group	group “DevOps” do action :create end
7	Add user to group	group “DevOps” do members”ramesh” append true end
8	Create user,group and file	user “Rammy” group “ktexperts” file “/rammyfile”
9	Execute Linux commands	execute “run a script” do command <<-EOH mkdir /ktexpertsdir touch /ktexpertsfile EOH end
10	Download package from internet	remote_file “/home/ec2-user/chef-workstation-0.13.35-1.el7.x86_64.rpm” do source “https://packages.chef.io/files/stable/chef-workstation/0.13.35/el/8/chef-workstation-0.13.35-1.el7.x86_64.rpm” action :create end

Ruby Script for Multiple Resources

SNO	ACTION	SCRIPT
1	Install packages	%w(tree mysql httpd).each do \|p\| package p do action :install end end
2	Create users	%w(Ramesh Ajay Vinod).each do \|p\| user p do action :create end end
3	Create files	%w(/ktfile1 /ktfile2 /ktfile3).each do \|p\| file p do action :create end end
4	Create directories	%w(/ktdir1 /ktdir2 /ktdir3).each do \|path\| directory path do action :create end end
5	Create groups	%w(ktexperts1 ktexperts2 ktexperts3).each do \|grp\| group grp do action :create end end
6	Add users to single group	group ‘ktexperts1’ do action :modify members [‘Ramesh’,’Ajay’,’Vinod’] append true end