HelloWorld java program as sample ************************************* Task- 1 (Continuous Integration) CI ******************************************************* Job-1 Continuous Integration(CI)

using git,jenkins,nexus for creating .jar file( use maven deploy command to create .jar file) upload that jar file to nexus Repository.

Output should be: maven-snapshot content ur .jar file and .pom file

On ubuntu

install git create sample project in git(also create sample repo in github.com) install jenkins from digitalocean install nexus(http://www.sonatype.org/nexus/2017/01/25/how-to-install-latest-sonatype-nexus-3-on-linux/) get the hello-world sample java program from git(mkdir sample,cd sampleapp,git clone https://github.com/DeepakOhol/sample.git) mkdir sample,cd sample mv sampleapp (space)src/ (space)target/ (space)pom.xml (space) /home/user/sample cd sample/ .........it will shows you that "something like nothing to .....initial .....something like that" git status git add . git commit -m "put any message like initial project push" git push origin master sudo vi pom.xml .......make following changes after" junit junit 3.8.1 test " part and add following to it ################# devrepo Internal Repository http://192.168.56.102:8081/#browse/browse/components:maven-snapshots ......................Put here, nexus Component URL

       <snapshotRepository>
                    <id>Snapshots</id>
                         <name>snapshotRepo</name>
                              <url>http://192.168.56.102:8081/repository/maven-snapshots/</url>                                  ......................Put here, nexus Repository URL
                               </snapshotRepository>
                       </distributionManagement>

################# save and close and push that file to git

and also add following lines to the file(sudo vi /usr/share/maven/conf/settings.xml)

inside tag add following lines:

###############################

Now goto jenkins dashboard open ur project(here my project name is "DevOps") goto section "Source code mgmt" select radio button git Repositories Repository URL https://github.com/mohitepramod/sample.git Credentials username and passwd Branch to build: Branch Specifier(blank for 'any') */master Repository Browser(Auto) ###############################################

put following inside jenkins configure/build section ############################################# mvn deploy .........used for storing .jar file to nexus and we already made some changes to the file "sudo vi /usr/share/maven/conf/settings.xml"and "pom.xml" file java -cp sample-0.0.1-SNAPSHOT.jar code.main.App ..........currently no need to run this command manually on terminal ########## up to here ############

where , sample-0.0.1-SNAPSHOT.jar is the jar file which is created code.main.App is the main class name from POM.xml file

click on save .....It will save that. click on "back to dashboard" which is available on top left corner now click on "Build Now" button. and see the console output. finally it will gives u o/p as "Finished:SUCCESS"

Now goto nexus dashboard and goto component--->maven-snapshots--->click on that--->here u will see ur application folder with .jar and .pom files

Task completion is Done. ***************************************************** Task-1 Ends ********************************************************************************************

Task-2 (Continuous Deployment) CD

Now it comes to CD(Continuous Deployment Part): scenerio: output of Task-1(stored .jar file into nexus) should fetch that .jar file and put it into docker container and execute that jar file in docker container()

first install docker in current Virtual machine(I am using 192.168.56.102 local machine) using following link: https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-16-04

On jenkins add new project named as"DevopsDeploy" and don't change any other section except "Build--->Execute shell" section. Now, we need to get the .jar file freom nexus repo, for doing the same we need to go towards jenkins and do the following in build----->execute shell : wget http://192.168.56.102:8081/repository/maven-snapshots/Sample/sample/0.0.1-SNAPSHOT/sample-0.0.1-20171102.060539-1.jar

after hit on save button

now, click on "Build Now" which is available on left pane, it will start executing job.we can see the executing job in consoleoutput. there we can find out whether our job get successfully executed or not. If u got response "SUCCESS" ,then ur job got executed successfully. and .jar file is coppied into following location: "/var/lib/jenkins/workspace/ur_project_name(DevOpsDeploy)" ......Here, "DevOpsDeploy" is my jenkins project name.

Now, Docker comes in to picture. we need to (create)write one Dockerfile sudo vim Dockerfile and paste the following content: ########## Dockerfile content ################### FROM ubuntu:14.04 RUN ls COPY . / RUN apt-get update && \

apt-get upgrade -y && \

apt-get install -y  software-properties-common && \

add-apt-repository ppa:webupd8team/java -y && \

apt-get update && \

echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections && \

apt-get install -y oracle-java8-installer && \

apt-get clean

RUN java -cp sample-0.0.1-20171102.060539-1.jar code.main.App

###############################################

explanation of content of Dockerfile: first line is downloading the ubuntu 14.01 image 2nd line is for executing "ls" command and for run the .jar file of java,there should be java installed on that docker container that's why we are installing java 8 (on docker container) 3rd line is for copying our .jar file to docker container's root directory so from 4th line to 10th line (installation of java steps) on 11th line we are executing our .jar file.

explanation of 11th line from Dockerfile is:---> RUN java -cp sample-0.0.1-20171102.060539-1.jar code.main.App

                 where,
                                sample-0.0.1-20171102.060539-1.jar  ------> ur .jar file name
                                 code.main.App                 -------->     This name u can take from pom.xml file(value of tag <mainClass>code.main.App</mainClass>)

That's completed our Dockerfile. Now, we need to execute following commands(to run Dockerfile): goto project's workspace(here, my project workspace is "/var/lib/jenkins/workspace/ur_project_name(DevOpsDeploy)")

slave@salve-virtualbox:/var/lib/jenkins/workspace/DevOpsDeploy$ docker build .(dot) (hit enter) .............This will execute our Dockerfile and gives docker-image id at the bottom(when it runs successfully.)

               You will get output like:
                                            Sending build context to Docker daemon   5.12kB
                                            Step 1/5 : FROM ubuntu:14.04
                                                                ---> dea1945146b9
                                            Step 2/5 : RUN ls
                                                                 ---> Using cache
                                                                 ---> 8fa205a97ec9
                                            Step 3/5 : COPY . /
                                                                 ---> afc0f7313586
                                            Step 4/5 : RUN apt-get update &&     apt-get upgrade -y &&     apt-get install -y  software-properties-common &&     add-apt-repository ppa:webupd8team/java -y &&     apt-get update &&     echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections &&     apt-get install -y oracle-java8-installer &&     apt-get clean
                                                                 ---> Running in 136306ca5218
                                                               Get:1 http://security.ubuntu.com trusty-security InRelease [65.9 kB]
                                                               Get:2 http://security.ubuntu.com trusty-security/universe Sources [77.9 kB]
                                                               Ign http://archive.ubuntu.com trusty InRelease
                                                               Get:3 http://security.ubuntu.com trusty-security/main amd64 Packages [852 kB]
                                                               Get:4 http://archive.ubuntu.com trusty-updates InRelease [65.9 kB]
                                                                                               :
                                                                                               :
                                                                                               :
                                                                                               :
                                        Step 5/5 : RUN java -cp sample-0.0.1-20171102.060539-1.jar code.main.App
                                                             ---> Running in 569b24323081
                                                                     Hello World!
                                                             ---> 3d19b9a98821
                                                            Removing intermediate container 569b24323081

Successfully built 3d19b9a98821 ######################################## here, we will get docker image id "Successfully built 3d19b9a98821", i.e docker image id is "3d19b9a98821" ##################################

slave@salve-virtualbox:/var/lib/jenkins/workspace/DevOpsDeploy$ sudo docker run -itd docker_image_id(3d19b9a98821) (hit enter) Output: [sudo] password for slave: cc4002330d4390907bbcd47558a21892f120660caa23e31142655918c3573ddd ...................after running that command, we will get new docker_image_id for entering into docker-containers root directory.

slave@salve-virtualbox:/var/lib/jenkins/workspace/DevOpsDeploy$ sudo docker exec -it new_docker_image_id(cc4002330d4390907bbcd47558a21892f120660caa23e31142655918c3573ddd) /bin/bash (hit enter)

after completion of execution of the above command you will entered into Docker container's root directory.

Output of above command as follows: root@cc4002330d43:/# root@cc4002330d43:/# ls output: Dockerfile boot etc lib media opt root sample-0.0.1-20171102.060539-1.jar ....................This is our .jar file srv tmp var bin dev home lib64 mnt proc run sbin sys usr