DevOps Classroomnotes 25/Jun/2023

Azure DevOps

YAML

• YAML is a data represntation language.
• YAML is name value pair collection
• YAML represents name value pair as <name>: <value>
• names generally are strings/text and value can be of any type
• Types:
  • Simple
    • Text/String
    • number
    • boolean
  • Complex
    • list
    • object/map
• Generally yaml used for some configuration purposes will have predefined structure/schema
• Resume

---
career_objective: <type text>
professional_summary: <type text>
technical skills: <type TechicalSkill>
WorkExperience: <type WorkExperience Array> 
contact: <type Contact>

TechicalSkill: <type Skill Array>

Skill => 
<name of skill>: <type text Array>

WorkExperience =>
Company: <type text>
StartDate: <type text>
EndDate: <type text>
RolesAndResponsibilities: <type text Array>
Designation: <type text>

Contact =>
email: <type text>
phone: <type text>

• Lets start writing a resume based on schema defined above

---
career_objective: |
    Seeking a challenging position in a reputed organization where 
    I can learn new skills, expand my knowledge, and leverage my    
    learnings
professional_summary: |
    Skilled DevOps Engineer with 3+ years of hands-on experience    
    supporting, automating, and optimizing mission critical     
    deployments in AWS, leveraging configuration management, CI/CD, 
    and DevOps processes.   Configuration management using     
    Puppet, Ansible, and Chef. Knowledge of Python, C/C++
technicalskills:
  - os:
      - linux
      - windows
  - ci/cd:
      - Jenkins
      - Azure DevOps
  - VCS:
      - git
WorkExperience:
  - Company: Apple
    StartDate: 6/25/2020
    EndDate: Present
    RolesAndResponsibilities:
      - Maintaining CI/CD Pipelines
      - Developing K8s Manifests
    Designation: Sr DevOps Engineer
  - Company: Google
    StartDate: 6/25/2014
    EndDate: 6/24/2017
    RolesAndResponsibilities:
      - Maintaining CI/CD Pipelines
      - Developing K8s Manifests
    Designation: DevOps Engineer

• Lets look at one more schema for describing investments

---
realestate: <type Property Array>
Equity: <type Equity Array>
MF: <type MF Array>
FD: <type FD Array>

Property =>
AssetValue: <type Number>
Type: <type Text> Commercial|Residential|Agricultural
AreaInSqft: <type Number>

Equity =>
Company: <type text>
NumberOfStocks: <type number>
StockIndex: <type text> NSE|BSE|DOW
AverageStockPrice: <type number>

MF =>
Instrument: <type text>
Number: <type number>
AveragePrice: <type number>

FD =>
Bank: <type Text>
Amount: <type Number>
IntrestRate: <type Number>

• Sample YAML

realestate:
  - AssetValue: 100000000
    Type: Commercial
    AreaInSqft: 3000
Equity:
  - Company: HUL
    NumberOfStocks: 1000
    StockIndex: NSE
    AverageStockPrice: 100.5
  - Company: ITC
    NumberOfStocks: 10000
    StockIndex: NSE
    AverageStockPrice: 10.5
MF:
  - Instrument: SBI Magnum Small Cap
    Number: 100000
    AveragePrice: 350.4
FD:
  - Bank: Sapthagiri Grameena Bank
    Amount: 10000000000
    IntrestRate: 9.75

Azure DevOps Pipeline

• Azure DevOps Pipelines are expressed in yaml formats in git repositories generally with name azure-pipelines.yaml
  
• YAML Schema for azure devops pipelines Refer Here
• Key Concepts of Azure DevOps Refer Here
  
• Pipeline:
  • Where should it execute? => Agents
  • When should it run => Trigger
  • What should happend when pipeline executes
    • Stages
    • Jobs
    • Steps
• When pipeline is executed it is execute with code from version control already cloned and in the branch specified

---
trigger:
  - master

pool: ubuntu-latest

stages:
  - stage: stage1
    displayName: first stage

    jobs: 
      - job: build code
        displayName: Build Code
        steps:
          - task: Maven@4
            inputs:
              mavenPOMFile: 'pom.xml'
              goal: package

• If your pipeline has only one stage, consider pipeline is collection of jobs
• Lets try to write the same pipeline above as collection of jobs as we have only one stage

---
name: learning
trigger:
  - master
pool: ubuntu-latest
jobs:
  - job: buildjob
    displayName: Build JOB
    steps:
      - task: Maven@4
        inputs:
          mavenPOMFile: 'pom.xml'
          goal: 'package'

• Lets write the pipeline as collection of steps

---
name: learning
trigger:
  - master
pool: ubuntu-latest
steps:
  - task: Maven@4
    inputs:
      mavenPOMFile: 'pom.xml'
      goal: 'package'