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Showing posts with label Automation. Show all posts
Showing posts with label Automation. Show all posts

YAML Cheat Sheet


YAML or YML has become a must know data serialization language for System Administrators, it is widely used in many of the configuration management, containerization platforms , Orchestration applications, Infra as a Code, and many more, and because of it's human readable formats, it's widely accepted and used.

YAML usage in some widely used sysadmin tools.
  • Ansible
  • Docker
  • Kubernetes
  • AWS CloudFormation.
  • TerraForm
Here in this blog post, i have kept some of the YAML cheat sheets, which can help you to craft your own or to read some yaml files.

Key Value

A variety of data is structured in the form of key value pairs.

Key - Items written on left side of data ( Fruit, Drink, Vegetable )
Value Items written on left side of data ( Orange, Juice, Spinach)
Important: Space after :

YAML Key Value Pair
Fruit: Orange Drink: Juice Vegetable: Spinach

List or Array

A representation of List Smartphone type and Brand type in YAML format.

YAML List/Array
- IOS - Android Brands: - Apple - Nokia - Micromax
- Vivo


A representation of Employee named 26 year old male named as Jignesh working as Web developer data in dictionary type in YAML format.

YAML Dictionary/Map
Employee: Name: Jignesh Sex: Male Age: 26 Title: Web Developer

Dictionary inside List

A representation of multiple list of Fruits (Mango, Guava, Banana) and their individual specification mapped in dictionary value ( Calories, Fat, Carbs )

YAML Dictionary inside List
Fruits: - Mango: Calories: 95 Fat: 0.3 Carbs: 25 - Guava: Calories: 105 Fat: 0.4 Carbs: 27 - Banana: Calories: 45 Fat: 0.1 Carbs: 11 Vegetables: - Onion: Calories: 25 Fat: 0.1 Carbs: 6 - Potato: Calories: 22 Fat: 0.2 Carbs: 4.8 - Ginger: Calories: 8 Fat: 0.1 Carbs: 1.9

List inside Dictionary

A representation of Employee named 26 year old male named as Jignesh working as Web developer data in dictionary type.

Employee Shail has been assigned two Projects ( Login and Logout Form ), a representation of List data.

YAML List inside Dictionary
Employee: Name: Shail Sex: Male Age: 28 Title: Web Developer
- Login Form - Logout Form

For sure there are many more to update in the YAML cheat list, but will begin with these..

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How to export and import Jenkins job.

If you have multiple jenkins instances, there might be a requirement to export an existing jenkins job, that could be further imported into the newer jenkins instance.

We will learn how to do the export/import of jenkins job using jenkins cli.

How to Export existing Jenkins job.

  • Jenkins Home Page 
  • Manage Jenkins
  • Jenkins CLI.
  • Download  jenkins-cli.jar

  • Click on Jenkins CLI.

Once file "jenkins-cli.jar" file has been downloaded, we are ready to export our Jenkins job, lets do it.
Open your terminal and run the below commands.

Authenticate and List down your jobs to identify the one, which one you want to export, replace "your-jenkins-server-url:your_server_port" from your source jenkins server's url and port.

cyberkeeda@jenkins-master:~$ java -jar jenkins-cli.jar -s "http://your-jenkins-server-url:your_server_port" -auth UserName:Password  list-jobs

docker ps

Now, from above enlisted jobs i want to export the one named as "djpass-docker-app".
Run the below command and replace the highlighted one by yours.

cyberkeeda@jenkins-master:~$  java -jar jenkins-cli.jar -s "http://your-jenkins-server-url:your_server_port" -auth UserName:Password get-job djpass-docker-app > djpass-docker-app.xml

We have successfully exported our jenkins job named as "djpass-docker-app" as an xml file named as "djpass-docker-app.xml"

How to import Jenkins job to different Jenkins server.

  • Go to your new jenkins server dashboard, where you want to import.
  • Follow the same above steps to download the jenkins-cli.jar file.
  • Ensure you are ready with "jenkins-cli.jar" and your exported jenkins job XML file with you.
Now run the below command to import your jenkins job xml file to new jenkins server.
Note : Replace the highlighted one by yours.

cyberkeeda@jenkins-slave:~$  java -jar jenkins-cli.jar -s "http://your-Newjenkins-server-url:your_server_port" -auth UserName:Password create-job new-djpass-docker-app < djpass-docker-app.xml

Hoah !!! Thats it, check your dashboard to verify the same.

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AWK equivalent in Windows CMD

Missing AWK on Windows ?  for /f  may help you.
Lets see how can we implement the same.


C:\Users\Cyberkeeda>netsh interface show interface

Admin State    State          Type             Interface Name
Enabled        Connected      Dedicated        Wi-Fi
Enabled        Connected      Dedicated        VMware Network Adapter VMnet1
Enabled        Connected      Dedicated        VMware Network Adapter VMnet8
Enabled        Disconnected   Dedicated        Ethernet

Lets assume we have saved the same within a file in linux names as file.txt

Within Linux, to gather the State of interfaces, we use the below command.

cat file.txt| awk '{print $2}'


In Windows, it can be accomplished with FOR /F

C:\Users\cyberkeeda>for /f "tokens=2" %a in ('netsh interface show interface') do @echo %a


Now, if wish to add two values .

cat file.txt| awk '{print $1 " " $2}'

Admin State
Enabled Connected
Enabled Connected
Enabled Connected
Enabled Disconnected

Same can be accomplished within Windows as

C:\Users\cyberkeeda>for /f "tokens=1,2" %a in ('netsh interface show interface') do @echo %a %b
Admin State
Enabled Connected
Enabled Connected
Enabled Connected
Enabled Disconnected

In case, if you want to additional string along with the variable.

C:\Users\cyberkeeda>for /f "tokens=1,2" %a in ('netsh interface show interface') do @echo Boot Stats= %a Ethernet stat= %b

Now in case, if you want to use further filter within it, below one liner can help you.

C:\Users\cyberkeeda>netsh interface show interface | for /f "tokens=2" %a in ('findstr Wi-Fi') do @echo %a

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How to add Hosts and Host groups into Ansible Server

Ansible Initial Host Configuration.

Ansible knows the hosts and hostgroups from a host file by default it is located as /etc/ansible/hosts.

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How to Install Ansible on CentOS 7

Need Automation on Linux : Ansible will become your best friend for sure.

Ansible is the simplest way to automate apps and IT infrastructure. Application Deployment + Configuration Management + Continuous Delivery.

So let's not discuss more jump into installation to have hands on it.

Redhat/Centos ships ANSIBLE on its default repository, so you don’t ned to woory about packages or it’s dependencies.

Just a single command will install ansible and your Automation cockpit is ready to fly.

cybeerkeeda@Linux-Maniac:~ yum install ansible

If you too found the same issue while installing ansible from one liner yum command.
cybeerkeeda@Linux-Maniac:~ yum install ansible 
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base:
 * extras:
 * updates:
No package ansible available.
Error: Nothing to do

Make sure first of all you are connected to internet, then simply install the epel repo first.

cybeerkeeda@Linux-Maniac:~ yum install epel-release
Then run the same earlier command  yum install ansible.
cybeerkeeda@Linux-Maniac:~ yum install ansible
Done ! All fine 

Now lets confirm it’s installation status by checking the installed ansible version.
cybeerkeeda@Linux-Maniac:~ ansible --version

  config file = /etc/ansible/ansible.cfg
  configured module search path = Default w/o overrides
  python version = 2.7.5 (default, Nov  6 2016, 00:28:07) [GCC 4.8.5 20150623 (Red Hat 4.8.5-11)]

Do find the video for reference purpose too.

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Download all Puppet Packages , puppet packages

Puppet Package Repository links.

Download any packages relevant with puppet directly through puppet repository.

Add direct repo for REDHAT/ CentOS 7 , if you are connected to internet.

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