DEV Community: Aravind

Azure DevOps : CICD using Azure DevOps demo generator

Aravind — Thu, 25 Mar 2021 10:05:31 +0000

What is Azure DevOps demo generator?

Azure DevOps demo generator provides different templates, from which you can build and deploy different applications. These template comes which Source code , work items and pipelines

In this blog I will provide all the information needed to start using Azure DevOps demo generator and Azure DevOps platform for building and deploying your application using CICD pipelines.

Prerequisites

1.Microsoft account

2.Login to Azure Devops demo generator platform using same account.

https://azuredevopsdemogenerator.azurewebsites.net/

3.Login to azure DevOps as well.

https://azure.microsoft.com/en-us/services/devops/

4.Local machine having Tomcat running.

Demo

Once you login into your azure Devops platform, Create your own organization.

Note: All these can be done for free, no subscription needed

Now go to Azure Devops demo generator, there are plenty of templates available, for this demo I will be choosing a Java based application.

Once you click on to create project , all the details along with source code and pipeline will be cloned to your DevOps platform.

Now by going through Azure DevOps ,you can able to see the source code ,build and release pipeline.

Creating build pipeline :

Here you are already provided with build pipeline ,either you can modify it or you can use the same pipeline or create new pipeline.

Tasks involved in this pipeline

1.Getting your source code from Azure repos.

2.Building your code.

3.Creating and packaging your build artifacts.

Release pipeline

For release pipeline , I will be using Deployment groups for deploying my artifacts into my local machine which has tomcat sunning in it.

Deployment groups

In deployment groups you can specify your machine in which you need your application to be

Steps to create deployment groups

1.Go to deployment groups in pipelines.

2.Create a deployment group, select machine OS ,in my case it's windows.

3.Copy and paste the given command in your machine powershell.

4.powershell should be started as administrator.

5.Create personal access token.

Which will be prompted in powershell for Authorization.

Once this steps are done , The deployment group target machine status will be shown as online as shown below.

Now go back to release pipeline

Create a release pipeline , make sure it is using the artifacts we created using build pipeline.

1.Now in the tasks ,add an deployment group task as shown below.

2.Add a copy task which will copy the build artifacts to our local machine.(copy war file to tomcat webapps folder)

3.Add a command line task to stop and start tomcat.

(Make sure you have tomcat setup done in your local machine)

Once this is done and pipeline succeeds,

You will be able to visit your application using

localhost:8080/warfileprefix

In my case it is localhost:8080/myshuttledev

Linux Basics

Aravind — Mon, 22 Mar 2021 12:27:37 +0000

What is LINUX ?

--Linux is open source & free - Derived from UNIX, written in C - low level language

--Terminal - It's the place where you can interact with OS using commands.

--All the distributions providers [ ubuntu, linux mint, Centos, Fedora, Redhat, Kali linux, etc] they will take the kernal & they will modify & release their own linux version. That means "ubuntu, linux mint, Centos, Fedora, Redhat,Kali linux, etc ] all are Linux only

Basics Linux commands:

cd -- moves to home directory (change directory) , used to move to different directory.

man -- manual (like an user manual)
help -- provide information about each command
ls -- To list files and directories under a folder.
ls -lh -- human readable

Wildcards:

ls *.Txt - - list all the Txt files
ls ?.Txt -- list only Txt file which has one character
eg: a.txt b.txt
ls file[1234].txt

mkdir -p nee/folder/subfolder -- To create directory under specified path

-p -- to create subfolders

create and delete (File/Directory)

touch filename --create a file
rm filename --remove a file

mkdir "Hello world" --creates a dir
To include space in folder name
rmdir -- empty directory
rm -r -- to remove directory that has files
rm -ri folder -- interactive

To edit a file user nano or vi editor:

NANO:

nano filename -- brings you to editor

^ ctrl
M - alt

FIND:

find -name ".Txt"
find -iname ".TXT"
find -type f --file
find -type d --dir
find -maxdepth 2 --levels to search
-i -- case insensitive

Viewing files:

cat file.txt
tac ----- reverse order vertically
rev ------ reverse horizontally
less file.txt -----when file size is big
head -n 20 test.txt -----first 20 lines
tail -n 20 -----last 20 lines

Sorting:

sort test.txt
sort -n test.txt ------> for numbers
sort -r -----> for reverse order
sort -u -----> for unique list

ARCHIVING-COMPRESSING:

It involves two steps:

1.creating tar balls
tar -cvf tarballname file1.txt file2.txt
C- creating tar
V - verbose
F ----file

Extracting ----x

tar -xvf tarballname

2.zip tarball using gzip or bzip2

gzip name.tar --> this will give --> name.tar.gz
gunzip name.tar.gz

creating Zip file:
zip name.zip file1 file 2
Unzip name.zip

To make file executable
chmod +x file.txt

CRONTAB:

To auto schedule jobs/commands

crontab -e ------- take u to crontab,where you can view cronjobs and can add new cron jobs

To find about the machine like Version, flavor:

uname -o
Uname -r
hostnamectl
cat /etc/os-release

Installation and Removal
rpm -i --install (install new RPM; error if already installed)
rpm -U --upgrade (delete existing RPM, if any; install new)
rpm -F --freshen (update RPM only if package already installed)
rpm -e --erase (remove, delete, expunge)

PACKAGE
rpm -q [packages] [information]
rpm -qa (all installed packages)
rpm -q package_name
rpm -qf (filename)
rpm -qp (package filename)
rpm -qa | grep foo

Tee

ls -l | tee new.txt | cat > t.txt

Tee command is literally a "T"

COMMAND flows from left to right

It will spit out the result of command in new.txt

File Permissions

Owner : Group : Others
Read - 4
Write - 2
Execute - 1 [ Clicking the directory & going inside]
ls test.txt shows 10 indexs -rw-rw-r--
1st index -> Indicates file if it is a Directory it will show as d
2nd,3rd,4th -> Indicates Owner has read,write,execute permission
5th,6th,7th -> Indicates Group has read,write,execute permission
8th,9th,10th -> Indicates Others has read,write,execute permission