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How We Manage Our Infrastructure with Chef

It’s been awhile since we decided to remotely update the servers. Not even the servers, but the scripts on those servers.


We use self-compiled scripts for content update (for real-time debugging). Using the server-client principle, that is the initializer script and the executable script on the servers. But since there are a lot of servers, making changes to a script on each server will take ages. 


So, we begin.


Requirements: 

1. We already have the OS with updated packages.

2. We have a FQDN name.

3. Curl and wget should already be installed.



Server installation: 

1. Go to https://www.opscode.com/chef/install

2. Click tab "Chef Server"

3. Select the operating system and the architecture

4. Select Chef version

5. Install the package

rpm -ivh https://opscode-omnibus-packages.s3.amazonaws.com/el/6/x86_64/chef-server-11.1.3-1.el6.x86_64.rpm

Configure Chef server 11.*. Run command

# chef-server-ctl reconfigure

It will install and set up the required packages itself


Then we stop the web-server, if any, and run the verification script:

# chef-server-ctl test

After the test, go to:

# https://FQDN-OR-IP-OF-CHEF-SERVER


Note: Default UserName/Password: admin/p@ssw0rd1


Setting up the WorkStation: 


Run command (on Linux like)

# curl -L https://www.opscode.com/chef/install.sh | bash

% Total % Received % Xferd Average Speed Time Time Time Current


Dload Upload Total Spent Left Speed

101 6790 101 6790 0 0 3826 0 0:00:01 0:00:01 —:—:— 12190

Downloading Chef for el…

Installing Chef

warning: /tmp/tmp.KnyQTnqz/chef-.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 83ef826a: NOKEY

Preparing… ########################################### [100%] 1:chef ########################################### [100%] Thank you for installing Chef!

After the installation is complete, verify the client is installed

# chef-client -v

 Chef: 11.6.0

Create a Chef directory


Copy Cert Keys from Chef Server to Workstation User Folder

$ mkdir ~/.chef
$ scp root@chef-server:/etc/chef-server/admin.pem ~/.chef
$ scp root@chef-server:/etc/chef-server/chef-validator.pem ~/.chef

Now, configure the client using the “knife” command

$ knife configure -i

Overwrite /root/.chef/knife.rb? (Y/N) y


Please enter the chef server URL: [https://test.example.com:443] https://chef-server.example.com:443/

Please enter a name for the new user: [root] knife-user1

Please enter the existing admin name: [admin] Enter

Please enter the location of the existing admin’s private key: [/etc/chef-server/admin.pem] ~/.chef/admin.pem

Please enter the validation clientname: [chef-validator] Please enter the location of the validation key: [/etc/chef-server/chef-validator.pem] ~/.chef/chef-validator.pem

Please enter the path to a chef repository (or leave blank):

Creating initial API user…

Please enter a password for the new user:

Created user[knife-user1] Configuration file written to /root/.chef/knife.rb

Your “Knife config” (knife.rb) will look like this:

$ cat ~/.chef/knife.rb

log_level :info

log_location STDOUT

node_name ‘knife-user1’

client_key ‘/root/.chef/knife-user1.pem’

validation_client_name ‘chef-validator’

validation_key ‘/root/.chef/admin.pem’

chef_server_url ‘https://chef-server.example.com:443/’

syntax_check_cache_path ‘/root/.chef/syntax_check_cache’

Check our installation by running the respective commands:

$ knife client list

chef-validator

chef-webui

$ knife user list

admin

knife-user1

Installing the node:


Run command (on Linux like)

# curl -L https://www.opscode.com/chef/install.sh | bash

% Total % Received % Xferd Average Speed Time Time Time Current


Dload Upload Total Spent Left Speed

101 6790 101 6790 0 0 3826 0 0:00:01 0:00:01 —:—:— 12190

Downloading Chef for el…

Installing Chef

warning: /tmp/tmp.KnyQTnqz/chef-.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 83ef826a: NOKEY

Preparing… ########################################### [100%] 1:chef ########################################### [100%] Thank you for installing Chef!

Create Chef directory

# mkdir /etc/chef

Copy Chef Server Validation Cert Keys from Chef Server to our node in “/etc/chef”:

# scp root@chef-server:/etc/chef-server/chef-validator.pem /etc/chef

Run the command and register yourself in Chef Server:

# chef-client -S https://FQDN-OR-IP-OF-CHEF-SERVER -K /etc/chef/chef-validator.pem

Once the client is verified, we have to create a file in “client.rb” in directory “/etc/chef”.

# vi /etc/chef/client.rb

log_level :info

log_location STDOUT

chef_server_url ‘https://FQDN-OR-IP-OF-CHEF-SERVER’

Check successful registration of the node


On WorkStation, run command:

# knife node list

And on the server in web-interface

# https://FQDN-OR-IP-OF-CHEF-SERVER

Run the client:

# chef-client
# chef-client -l debug (In case if you want to debug)

Create a simple Cookbook and write a Recipe there


Log in to WorkStation:

# vi /root/.chef/knife.rb

cookbook_path [ ‘/usr/local/src/chef/cookbooks’ ]

Create a directory for Cookbook:

# mkdir -p /usr/local/src/chef/cookbooks

Now, create a simple Cookbook

# knife cookbook create cookbook-test

Go to the directory

# cd /usr/local/src/chef/cookbooks
# tree cookbook-test

cookbook-test/

├── attributes

├── CHANGELOG.md

├── definitions

├── files

│ └── default

├── libraries

├── metadata.rb

├── providers

├── README.md

├── recipes

│ └── default.rb

├── resources

└── templates

└── default

Now, let's create a recipe for the new group (system-admins) and user “sanjay”.

 # cat /usr/local/src/chef/cookbooks/cookbook-test/recipes/default.rb

#

# Cookbook Name:: cookbook-test

# Recipe:: default

#

# Copyright 2016, YOUR_COMPANY_NAME

#

# All rights reserved — Do Not Redistribute

#

group «system-admins» do

gid 1001

end

user «sanjay» do

comment «Sanjay User»

shell «/bin/bash»

home «/home/sanjay»

gid «system-admins»

uid 1002

supports :manage_home => true

password «$1$QwuUa80Z$KZkYq8CqICVyIsK1tHZ7s0»

end

To upload cookbooks to the server, do the following:

# knife upload cookbooks

Note: this will upload all cookbooks to the server


To upload a particular book to the server:

# knife upload cookbooks cookbook-test

Now, add our recipe to run_list

# knife node list

node1.example.com

node2.example.com

node3.example.com

#  knife node run_list add node1.example.com cookbook-test

node1.example.com:

run_list: recipe[cookbook-test

Now, log in to the machine node1.example.com, and run command

# chef-client

[2016-10-25T04:47:36-07:00] INFO: Forking chef instance to converge…

Starting Chef Client, version 11.6.2

[2016-10-25T04:47:36-07:00] INFO: *** Chef 11.6.2 ***

[2016-10-25T04:47:37-07:00] INFO: Run List is

] [2016-10-25T04:47:37-07:00] INFO: Run List expands to [cookbook-test] [2016-10-25T04:47:37-07:00] INFO: Starting Chef Run for node1.example.com

[2016-10-25T04:47:37-07:00] INFO: Running start handlers

[2016-10-25T04:47:37-07:00] INFO: Start handlers complete.

resolving cookbooks for run list: [«cookbook-test»] [2016-10-25T04:47:37-07:00] INFO: Loading cookbooks [cookbook-test] Synchronizing Cookbooks:

[2016-10-25T04:47:37-07:00] INFO: Storing updated cookbooks/cookbook-test/recipes/default.rb in the cache.

[2016-10-25T04:47:37-07:00] INFO: Storing updated cookbooks/cookbook-test/metadata.rb in the cache.

[2016-10-25T04:47:37-07:00] INFO: Storing updated cookbooks/cookbook-test/README.md in the cache.

[2016-10-25T04:47:37-07:00] INFO: Storing updated cookbooks/cookbook-test/CHANGELOG.md in the cache.

— cookbook-test

Compiling Cookbooks…

Converging 1 resources

Recipe: cookbook-test::default

* group[system-admins] action create[2016-10-25T22:23:38-07:00] INFO: Processing group[system-admins] action create (cookbook-test::default line 9)

(up to date)

* user[sanjay] action create[2016-10-25T04:47:37-07:00] INFO: Processing user[sanjay] action create (cookbook-test::default line 9)

(up to date)

[2016-10-25T04:47:37-07:00] INFO: Chef Run complete in 0.48225768 seconds

[2016-10-25T04:47:37-07:00] INFO: Running report handlers

[2016-10-25T04:47:37-07:00] INFO: Report handlers complete

Chef Client finished, 0 resources updated

To create one more sendmail installation and run recipe, type on WorkStation

 # vim /usr/local/src/chef/cookbooks/cookbook-test/recipes/sendmail.rb
package 'sendmail' do
 
        action :install
     end
 
     service 'sendmail' do
        action [ :enable,:start ]
     end

Upload the cookbook

# knife upload cookbooks cookbook-test

Run on the node:

# chef-client

Recipe: cookbook-test::sendmail

* package[sendmail] action install[2016-10-25T22:05:22-07:00] INFO: Processing package[sendmail] action install (cookbook-test::sendmail line 1)

[2016-10-25T22:06:14-07:00] INFO: package[sendmail] installing sendmail-8.14.4-8.el6 from base repository


— install version 8.14.4-8.el6 of package sendmail

* service[sendmail] action enable[2016-10-28T04:12:10-07:00] INFO: Processing service[sendmail] action enable (system-users::sendmail line 5)

(up to date)

* service[sendmail] action start[2016-10-28T04:12:11-07:00] INFO: Processing service[sendmail] action start (system-users::sendmail line 5)

[2016-10-28T04:12:11-07:00] INFO: service[sendmail] started


— start service service[sendmail]

This is how Chef works. The official site contains a large amount of information about writing recipes and setting up the program.

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Web App Security 101: Keep Calm and Do Threat Modeling
Web,Outsourcing
ANGULAR 6 versus REACT 16.3
Other
Europe’s Big Payments Directive PSD2
Web,Outsourcing
Migration from Angular 1 to Angular 5
Web,Outsourcing,Other
JavaScript & WebSockets: How to Build Real-Time Applications
Outsourcing,Other
How to Ramp up Your Team Wisely
Web
Scaling software solutions - how it works
Web,Outsourcing,Other
Angular vs. React vs. Vue – Let the Fight Start!
Web,Amazon Web Services
Serverless vs. Hadoop & Containers In The Evolution Of Big Data & AI
DevOps
Setting Up: Traefik Balancer In Rancher Cloud
DevOps
DevOps Consulting – Our Business Is Automating Yours
Web
Microservices… when do we need them?
DevOps
How We Use Ansіble for Configuration of Our Environments
Web
JQuery vs. Angular: Ad Astra per Aspera
Web
K&C insights: how to make your workflow work for you
Mobile
WHY THE IONIC FRAMEWORK IS THE BEST CHOICE FOR YOUR HYBRID APP
Web,Amazon Web Services
What's New In React 16.3.0 - 16.4.2 | K&C React Dev
DevOps
Kubernetes Consulting – Take Control of Your K8s!
Other
The Power of the Holistic Business Analysis
Web,Other
GoLang: Features, Pros and Cons
Web,Amazon Web Services
Cloud App Security: Three Authentication Approaches
Web,Outsourcing
Angular 6 Will Be A Hit
Web
When Microservices Help Make Future-Ready Products
DevOps
Hybrid, SAAS+PAAS: cloud solution trends to watch in 2019
Web,Other
JAMSTACK IS THE NEW FACE OF STATIC SITES
DevOps,Outsourcing,Amazon Web Services
Information Security with AWS DevOps
Other,Marketing
How to Become a Leader in Your Market
Web,Outsourcing,Other
Angular 5 VS React.js – Who’s Going to Set the Tone in the Upcoming Year?
Testing
Fallstudie Testautomatisierung: Cucumber, Selenium und Jira Xray
DevOps
What to Choose: NFS or CEPH?
Outsourcing
SCALED AGILE FRAMEWORKS: YOUR COMPLETE GUIDE TO WHICH, WHY AND HOW
Web
Angular 4 vs React – what to choose in 2017
Web,Amazon Web Services
Single Page Application SEO: Tips & Tricks
Outsourcing
The BPM in the Microservice Environment
Web,Mobile,Outsourcing,Other
All You Wanted to Know About Chatbot Platforms
Web,Mobile,Back-end,Amazon Web Services
Why Enterprises Choose Serverless Architecture
Web,Outsourcing,Other
Golang vs. Node.js
Testing
Test Automation Case Study: Cucumber, Selenium and Jira Xray
Web,Other
SSR or CSR for Progressive Web App
Web,Our cases
White Label: A Customized Software Solution from a Business and Tech Perspective
Web
Centralized Logging with Logstash, Elasticsearch & Kibana
DevOps,Outsourcing
AWS DevOps: A New Way to Run Business
DevOps
How To Launch Kubernetes Federation on Google Cloud Platform
Testing
What Is Quality Assurance and Why You Need It Immediately
DevOps
Guide for Hashicorp Consul/Vault with Kubernetes
Web,Amazon Web Services
ANGULAR 7 OR REACT For Your App?
DevOps
Kubernetes backup with Heptio Ark (Velero)
Web,Amazon Web Services
Vue.js 2019 - not Angular / React
DevOps
Serverless Providers: A Comparative Analysis of AWS Lambda, Azure Functions & Google Cloud Functions
Web,Amazon Web Services
Your Guide To AWS Cognito For Serverless User Authentication
DevOps
Monolith, Microservices, Serverless... Which Will You Choose and Why?
DevOps,Outsourcing,Other
ROCKET.CHAT as an internal messaging system and helpdesk platform
DevOps
DevOps with Puppet: Tips on Setting it up for Configuring Servers
DevOps,Outsourcing
Rancher 2.0: A Quick Look at the New Version
Outsourcing,Testing
How the QA Team Tests Your Project
Web
All You Need to Know About Web App Security Now
DevOps
DEBUGGING AWS LAMBDA FUNCTIONS
Other
Angular vs. Vue vs. jQuery vs. React vs. Ember
Web,Mobile,Back-end,Amazon Web Services
Serverless Architecture for Modern Apps: Stacks Providers & Caveats
DevOps
Security in Kubernetes and How Your Company Can Benefit from It
Web,Outsourcing
Node.js vs. Angular.js – Two Sides of the Same Coin