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Deploy a multi-tier web application Locally

in this project we will build a multi tier application locally we will divide it to two parts, in the first part, we will build it manually and in the second part, we will automate our deployment

pre requisite tools

  • Virtual box
  • Vagrant
  • Git bash
  • IDE e.g vscode, notepad++
  • vagrant hostmanager plugin

we will be setting up in this order

  • mysql for our database
  • memcache for caching
  • rabbitmq for our message broker
  • tomcat for our application
  • nginx for web server

part 1: Manually Deploy a multi-tier application Locally

  • firstly, we will install hostmanager plugin vagrant plugin install vagrant-hostmanager this is used to manager multiple machines in one file
  • next, we will initailize vagrant with vagrant up
  • now we will edit the Vagrantfile, and clean up the comments to make it easy to read and work with
  • we will duplicate all the code 5 times and edit it, feel free to use any ide of your choice at this point as we will be powering 5 machines all ounce in a file
  • carefully edit only the neccesary parts for our project

below are the names for our virtual machines

  • db01: this will store and manage our database
  • mc01: memcached will cache our data
  • rmq01: message broker server
  • web01: the web server will serve as our load balancer to the app01 server
  • app01: the app server hosts our main application

we will start by powering up our machine after editing and configuring our Vagrantfile, with this

vagrant up

majorly, what we are doing here is to configure each of the machines, specifying its hostname, operating system, RAM size and private ip address

once everything is set vagrant up to bring up all our machines now all our machines are up, lets validate

vagrant ssh <hostname> and you will see information about the host

try vagrant ssh web01 and check cat /etc/host ping app01 and see sa successful ping

1. setting up the database

vagrant ssh db01 vi /etc/profile

add this to the last line DATABASE_PASS='admin123'

source /etc/profile this make the variable become permanent copy and paste the code below, to install neccesary packages to run our service

sudo -i
yum update -y
yum epel-release -y
yum install git mariadb-server -y
systemctl start mariadb
systemctl enable mariadb
systemctl statutus mariadb
mysql_secure_installation
#folllow all the command prompts and configure the database

once you are done with this run mysql -u root -p enter your password and you are in, now exit exit

we will run git clone to fetch our source code so as to initialize our database

once you are done log out with logout

2. setup memcached

vagrant ssh mc01

copy

sudo -i
yum update -y

yum install epel-release -y

to validate ss -tunlp | grep 11211

exit

3. setup rabbitmq

vagrant ssh rmq01

sudo -i
yum update -y

4. setting up application server

login to our app server vagrant ssh app01update packages, install dependencies jdk and some tools like wget and git copy and paste the code below to

#switch to root user
sudo -i

yum update -y
yum install epel-release -y

5. setting up web server

we are in the final configuration, log in to web server vagrant ssh web01

sudo apt update && sudo apt upgrade -y
sudo -i 
apt install nginx -y
vim /etc/nginx/sites-available/vproapp

part 2: Automate the Deployment of a multi-tier application Locally

we will create all neccesary settings to start up and deploy the app and provision it in the vagrant file

  1. vim memcached.sh and copy the code this file memc

  2. vim rabbitmq.sh and copy the code this file rabbitmq

  3. vim mysql.sh and copy the code this file mysql

  4. vim application.properties and copy the code this file app

  5. vim nginx.sh and copy the code this file nginx

  6. vim tomcat.sh and copy the code this file tomcat

  7. vim Vagrantfile and copy the code this file vagrantf

  8. git clone our application folder

and now you can power up your machines all preprovisioned with vagrant up