Devops Project-1 -Create build artifacts using Jenkins and deploy those using also by Jenkins by Raj Gupta

So both CI(build) and CD(deploy) part are done by using Jenkins

Take two AWS EC2 REHL server

1^st for Webserver in which install tomcat

2^nd for jenking server in which install jenking, git, ,maven and java

Now install jenking on Jenking ec2 server after installation done logging into webpage with public IP of server

After that do configuration of git, ,maven and java path in Jenking

http://52.206.225.213:8080/

Setup Git on jenkins console

·         Install git plugin without restart

• Manage Jenkins > Manage Plugins > available > GitHub (search for it in Filter and click on it then click on Install without restart)

After installation go back to Manage Jenkins once again and do below

·         Configure git path

• Manage Jenkins > Global Tool Configuration > Git

Left the value as default value

Name                        Default

Path to Git executable       git

Then click on apply and save

Setup Java on jenkins console

·         Configure JDK path

• Manage Jenkins > Global Tool Configuration > JDK

Then click on Add JDK and unclick on Install automatically

And fill below row

JDK Name                java

JAVA_HOME           /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-1.el7_6.x86_64 (this address

you can get by running command echo $JAVA_HOME    this will give path of java where it installs)

Then click on apply and save

Setup maven on jenkins console

• Install maven plugin without restart
• Manage Jenkins > Manage Plugins > available > Maven Invoker(search for it in Filter and click on it then click on Install without restart)

After installation go back to Manage Jenkins once again and do below

• Configure java path
• Manage Jenkins > Global Tool Configuration > Maven

Then click on Add Maven and unclick on Install automatically

And fill below row

Name                            Maven

MAVEN_HOME            /opt/maven/apache-maven-3.6.0 (this address

you can get by running command echo $ M2_HOME    this will give path of java where it installs)

Then click on apply and save

If you are not able to see Maven project tab after clicking New Item, then

►To add Maven Project in New Item Page,

just go to Manage Jenkins >> Manage Plugin,

click on Available Tab,

In the filter box enter "Maven plugin" and you will get search result as "Unleash Maven Plugin",

√ enable the check-box, click on "Download now and install after restart"

After Maven install on jenkin reboot the ec2 server

reboot

                 Real project starts from here

Now go to New Item then enter the Item name and click on Maven project after that click ok 

In next tab under Source code management select git and for Repository URL give the github URL where your code is there like below

Repository URL           https://github.com/rajkumargupta14/hello-world.git

Credentials                 None (because only for private github Credentials need to give)

In Build tab

Root POM                       pom.xml ( this file need to keep in github)

Goals and options          clean install package    ( give this option in this)

After that apply and save

Then Click on Build Now radio button

[root@ip-172-31-84-214 ~]# cd /var/lib/jenkins/workspace/

[root@ip-172-31-84-214 workspace]# ls

Test

[root@ip-172-31-84-214 workspace]# cd Test/

[root@ip-172-31-84-214 Test]# ls

Dockerfile  pom.xml  README.md  regapp-deploy.yml  regapp-service.yml  server  webapp

[root@ip-172-31-84-214 Test]# cd webapp/

[root@ip-172-31-84-214 webapp]# ll

total 4

-rw-r--r-- 1 jenkins jenkins 1141 Sep 12 07:51 pom.xml

drwxr-xr-x 3 jenkins jenkins   18 Sep 12 07:51 src

drwxr-xr-x 5 jenkins jenkins   76 Sep 12 07:51 target

[root@ip-172-31-84-214 webapp]# cd target/

[root@ip-172-31-84-214 target]# ll

total 4

drwxr-xr-x 2 jenkins jenkins   28 Sep 12 07:51 maven-archiver

drwxr-xr-x 2 jenkins jenkins    6 Sep 12 07:51 surefire

drwxr-xr-x 4 jenkins jenkins   54 Sep 12 07:51 webapp

-rw-r--r-- 1 jenkins jenkins 2868 Sep 12 07:51 webapp.war

[root@ip-172-31-84-214 target]#

Till now all JAR and WAR files are created for java project, so our CI part are done …. Now time for CD part for that go to second ec2 server (web server)

Install Tomcat on the second server after installation we need to do below two work in Jenking

1.     Install the pugging Deploy to container in jenking 

• Manage Jenkins > Manage Plugins > available > Deploy to container (search for it in Filter and click on it then click on Install without restart)

2.     Second give tomcat id and password to give go to below path

Credentials ---à Jenkins ---à Global credentials (unrestricted)-----à Add Credentials

Then fill the below….

Username and password you can give username of user you have created on tomcatcat server

<role rolename="manager-script"/>

  <user username="deployer" password="deployer" roles="manager-script"/>

For ID and Description you can give anything..

Now in Post-build Actions select Deploy war/ear to a container   then fill the below row

WAR/EAR files-     **/*.war

Context path-     leave it empty

Containers-        select Tomcat 8.x

Credentials:-     select from dropdown whatever you have crated

Tomcat URL:    http://3.91.193.216:8080/

Then click on apply and save

Now in Build Triggers tick the box Poll SCM   then give below to run ever minute

 Schedule-       */1 * * * *

Then click on apply and save.

Now do same changes on github then commit it so that save thing will be show in tomcat server browser

Go to github account where you have kept you code

https://github.com/rajkumargupta14/hello-world -------> webapp---à src/main/webapp-----àindex.jsp

then click on edit this file and do some changes in the index.jsp file

then enter save value in Commit changes like updated file or any other value you want

then you can click on commit changes button

when you click on commit changes button in github then after 1m automatically build will be start in jankins and code changes will be deploy in tomcat sever.

Now in broser give the below URL

http://3.91.193.216:8080/webapp/      then you will see the same output whatever changes you have done in code for app.

We need to give webapp in last because this app will be deploy in webapps folder of tomcat server with name webapp see the below details.

[ec2-user@ip-172-31-85-242 ~]$ sudo -i

[root@ip-172-31-85-242 ~]# ls

anaconda-ks.cfg  app  original-ks.cfg

[root@ip-172-31-85-242 ~]# cd app

[root@ip-172-31-85-242 app]# ls

apache-tomcat-8.5.37  apache-tomcat-8.5.37.tar.gz

[root@ip-172-31-85-242 app]# cd apache-tomcat-8.5.37

[root@ip-172-31-85-242 apache-tomcat-8.5.37]# ls

bin  BUILDING.txt  conf  CONTRIBUTING.md  lib  LICENSE  logs  NOTICE  README.md  RELEASE-NOTES  RUNNING.txt  temp  webapps  work

[root@ip-172-31-85-242 apache-tomcat-8.5.37]# cd webapps/

[root@ip-172-31-85-242 webapps]# ls

docs  examples  host-manager  manager  ROOT  webapp  webapp.war

[root@ip-172-31-85-242 webapps]# ls -ltr

total 12

drwxr-x---.  3 root root 4096 Jan 25 08:49 ROOT

drwxr-x---. 14 root root 4096 Jan 25 08:49 docs

drwxr-x---.  6 root root   83 Jan 25 08:49 examples

drwxr-x---.  5 root root   87 Jan 25 08:49 host-manager

drwxr-x---.  5 root root  103 Jan 25 08:49 manager

-rw-r-----.  1 root root 2476 Jan 25 10:08 webapp.war

drwxr-x---.  4 root root   54 Jan 25 10:08 webapp

[root@ip-172-31-85-242 webapps]#