simple-devops-project-3

Simple DevOps Project 3

Pre-Requirments

• Jenkins with Maven Server
• Docker host
• Create user on Docker Host
• Install Publish over ssh Plugin
• Enable connection between Docker and Jenkins

Create User On docker Host

create a new user for Docker management and add user to Docker (default) group

useradd dockeradmin
passwd dockeradmin
usermod -aG docker dockeradmin

Creat docker directory under /opt

mkdir /opt/docker

Write a Dockerfile under /opt/docker

vi Dockerfile

# Pull base image
From tomcat:8-jre8
# Maintainer
MAINTAINER "maheshkumar.root@gmail.com"

# copy war file on to container
COPY ./webapp.war /usr/local/tomcat/webapps

Install "publish Over SSH" plugin

Jenkins Dashboard >> Manage Jenkins > Manage Plugins > Available > Publish over SSH and install.

Enable connection between Docker and Jenkins

Jenkins Dashboard >> Manage Jenkins > Configure System > Publish Over SSH > SSH Servers

• SSH Servers:
  • Name : docker_host
  • Hostname: <ServerIP>
  • username: dockeradmin
  • password: *******

Test the connection by clicking Test Connection and save

Create Jenkins job

Jenkins Dashboard >> click New item

• Enter item name: Simple-Devops-Project-3

  • Source Code Management

    • Repository : https://github.com/ValaxyTech/hello-world.git
    • Branches to build : */master

  • Build

    • Root POM: pom.xml
    • Goals and options : clean install package

  • Send files or execute commands over SSH

    • Name: docker_host
    • Source files : webapp/target/*.war
    • Remove prefix : webapp/target
    • Remote directory : //opt//docker

  • Exec command[s] :

  docker stop mkn400_demo;
  docker rm -f mkn400_demo;
  docker image rm -f mkn400_demo_img;
  cd /opt/docker;
  docker build -t mkn400_demo_img .

  • send files or execute commands over SSH
    • Name: docker_host
    • Exec command : docker run -d --name mkn400_demo -p 8090:8080 mkn400_demo_img

Login to Docker host and check images and containers before run the job. (no images and containers)

Run Jenkins job

check images and containers again on Docker host. This time an image and container get creates through Jenkins job

Access web application from browser which is running on container http://<docker_host_Public_IP>:8090/webapp