220601 Today I Learned

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220601 TIL 작성
Kubernetes udemy 강좌 수강
AWS 스터디 준비

주요 키워드

Jenkins 공부
- 설치 및 구성
- Build Basic Jenkinsfile
K8s
- 섹션3

공부 정리

Jenkins for Beginners 1) Run Jenkins in a Docker Container
2) Create Multibranch Pipeline with Git
3) Basic Jenkinsfile Syntax
4) Git Integration - Trigger Jenkins build automatically

Run Jenkins in Docker Container

Learn how to run Jenkins in a Docker Container.

Pull Jenkins Image and run container
Initialize Jenkins and install default plugins
Create First Admin User
Types of Jenkins Projects

개요

Jenkins Container Setup
Create Multibranch Pipeline w/Git Repo
Types of Credentials
Basics of Jenkinsfile

Users Git Repo Jenkins
>Commit >trigger build

Jenkins Container Setup
- DockerHub의 Official Image는 DEPRECATED; 대신 lts 버전사용
- docker run -p 8080:8080 -p 50000:50000 -d -v jenkins_home:/var/jenkins_home jenkins/jenkins:lts
  - Expose port 8080 > By default runs on that port
  - Expose port 50000 > Master/Slave Commun.
  - Run in detached mode > run con. in bg.
  - Bind named volume > persist data of jenkins
    - 새로 생성대신 기존의 볼륨을사용하면(Host Vol) 권한 이슈 생길 수 있음
- 설치 수행 이후, 초기 비밀번호 생성됨
- localhost:8080 으로 Jenkins 실행하여 초기 비밀번호 입력 후 필요 플러그인 설치등 마무리
- 사용중인 App과 버전관리 도구에 따라 상이한 플러그인이 필요함

#### Create Multibranch Pipeline with Git

Create Multibranch Pipeline, configure credentials in Jenkins and discover branches by names.

In this video I show how to create a multibranch pipeline, explain how credentials plugin work in Jenkins and configure to filter branches by name.

Create Multibranch Pipeline
Explain how Credentials Plugin work in Jenkins
Filter Branches by Name

Cre8 Multibranch Pipeline w/Git

Credentials in Jenkins
Filter Branches by Name

Create new multibranch pipeline > Multiple Options

Branch source=Project u want to build
> git https://gitlab.com/nanuchi/techworld-js-docker-demo-app.git

behaviors
filter by name(w/regular exp)

build conf.
build from Jenkinsfile

Credentials in J
“Credentials” Plugin to store&manage them centrally

Credential Scopes

System: Only avail. on J server
Not for J jobs, 관리자가 수동으로 작업할시에 사용되는 Cred.
Global: Everywhere accessible
Project: Limited to pjt, ONLY w/multibranch pipeline

Cred Types

Username&pwd
Certificate
Secret File
New types based on plugins (ex. Github access token)

ID = Reference for ur cred.

create 1 for global, 1 for system

Credentials:

on the main page
on the pipeline page
- System cred. NOT accessible from pjt cred.

Discover branches by Name
filter by name(w/regular exp)
^dev|master|feature.*$ (|=or)
해당 3개의 브랜치만 사용. 버그픽스니 기타 다른 브랜치 build 안함

Jenkinsfile

In this video I show the syntax of a Jenkinsfile, explain the differences between scripted and declarative syntax. I also show how to test something out in a Jenkinsfile by replaying it and how to skip stages via restart option.

▬▬▬▬▬▬ Topics covered

Pipeline Syntax: Scripted vs. Declarative
Basic Syntax
Test something in Jenkinsfile - Replay Jenkinsfile
Restart from stage

Basic Jfile

Pipeline Syntax
Replay
Restart from stage

Pipeline Syntax

Scripted	Declarative
1st. syntax</br>Groovy engine</br>advanced scripting capabilities,high flexibility</br>difficult to start	Recent addition</br>easier to get started + powerful</br>pre-defined structure</br>

Required Fields of Jfile - json format

“pipeline”: must be top-level
“agent”: where to execute 마스터/슬레이브/윈도우노드/리눅스노드/etc/
“stages”: where the “work” happens
- “stages” & relative steps
  - stage(“build”){ steps{sh ‘npm install’ sh ‘npm build’} }
  - stage(“test”){ steps{echo ‘testing the app…’} }
  - stage(“deploy”){ steps{echo ‘deploying the app…’} }

Test changes in a Jfile-Replay

To try something out
- Adjust Jfile
- Commit
- Check out
- Re-build
Build 히스토리에서 Replay 선택, Jfile의 원하는 부분을 수정하고 Run
- stage(“build”){ echo’building the app…’ script{def test = 2+2>3? ‘cool’:’not cool’ echo test} }

Restart from stage

from build history, select that option
Skips the other stages

## Trigger Jenkins Build automatically

Jenkins Gitlab Integration. Learn how to trigger build on commit.

In this video I show how to trigger the Jenkins build after a commit. Also I show how to configure Jenkins polling for any changes.

This video covers the following:

Push Notification
Polling

Trigger J build automatically Git Integration

Push Notification
Polling for Changes

1st option Push Noti
- Trigger build
- need to set up both J & G
  1. Inst. J plugin based on VC System
  2. Conf. Repository Server Hostname
  3. Add Access Token or Credential
- 대충 webhook url 가져와서 서로 걸어두면 된다는 말
- J가 웹후크를 통해 코드변경사항을 수신
2nd Option. Polling
- Scan Multibranch Pipeline Triggers
- J polls every 1min > Gitlab answers Y/N
Good strategy to conf. both as a backup plan

Configure Build Tools in Jenkins and Jenkinsfile | Jenkins Tutorial

Learn how to configure build tools in Jenkins. Configure Gradle and Yarn in Jenkins and use it in Jenkinsfile.

Using Jenkins you want to build and package your application. So, depending on your application language you need a different build tool available on Jenkins. In this video I show you how to install and configure Gradle, Yarn and NPM build tools in Jenkins and how to use those tools in Jenkinsfile.

▬▬▬▬▬▬ T I M E S T A M P S
0:00 - Intro
1:13 - How to use build tools in Jenkins
1:57 - Check if your build tool is already available?
4:07 - Install npm and yarn from plugins
7:09 - Use build tools (gradle and yarn) in Jenkinsfile
10:43 - Alternative to using build tools in Jenkinsfile

Develop ur app
J should build and package that app
need a build tool available on J

4 main build tools

Backend
- Maven
- Gradle
Frontend/Javascript
- npm(nodejs)
- yarn

How to use these tools in J?

some build tools are already installed
The rest, need to inst&conf

Check if tool already available? If Y, Conf it.
Inst. it from Plugins & Do step 1.
Use it in ur build config (ex. in Jenkinsfile)

Step 1.
Global tool conf.
Gradle&Maven은 설치되어있음. npm과 yarn 설치필요
G&M은 구성만 하면됨

Step 2.
Manage plugins
Add NodeJS(included npm),
Then Do step 1. again

Global npm package to install > yarn@1.13.0

Create new Multibranch Pipelinew

Step 3.
stage(“run FE”{ steps { echo ‘executing yarn…’ } }
stage(“run BE”{ steps { echo ‘executing gradle…’ } }

Wrapper를 이용해서 step 내용 정의
nodejs(‘Node-10.17’){ sh ‘yarn install’ }
withGradle() { sh ‘./gradlew -v’}

Alternative to using tools w/o wrapper

Only 3 tools supported; maven, gradle, jdk

agent와 stages 사이에 tools 삽입
tools { gradle ‘Gradle-6.2’ }

Complete Jenkins Pipeline Tutorial | Jenkinsfile explained

In this complete Jenkins Pipeline Tutorial, I explain everything you need to know about Jenkinsfile.

This complete Jenkins Pipeline Tutorial will help you configure build pipeline for your own project using Jenkinsfile.

▬▬▬▬▬▬ T I M E S T A M P S ⏰ ▬▬▬▬▬▬ 0:00 Intro
0:11 What is Jenkinsfile?
0:50 From Scripted to Declarative Pipeline Syntax
2:48 Basic Structure of Jenkinsfile
8:40 Post Build Actions in Jenkinsfile
10:15 Define Conditionals / When expression
12:45 Using Environmental Variables in Jenkinsfile
20:13 Using Tools attribute for making build tools available
22:30 Using Parameters for a Parameterized Build
27:29 Using external Groovy scripts

Jenkinsfile Tutorial for Beginners

Definition & Syntax for Jfile
Jenkinsfile
- environmental variables
- parameters
- conditionals
- groovy script
- tools
- post

What is Jfile?

GUI 환경에서 젠킨스 프로젝트 생성 대신, 프로젝트 파이프라인을 코드화하여 생성

scripted pipeline
is created in ur git repository

From Scripted to Declarative Pipeline Syntax & Basic Structure

create Jenkinsfile in repository

Nasir