Three Tier Architecture using Docker

Create Blogging Site using Docker manual method.

• Set-up:

I use AWS EC2 Instance for this work. The EC2 Amazon machine is Amazon-linux.

• What is Three-tier Architecture:

1. For Blogging Site I use "WordPress".
2. For DataBase to the Wordpress I use "MySQL".
3. For Network I use own customised "Docker network".

Step: 1 [Install Docker & Start Docker Services]

Launch EC2 instance and install docker inside and start docker Service:

Docker install command:

yum install docker -y 

Start Docker Service command:

systemctl enable  docker --now 

Check Docker Status:

systemctl status docker

Step: 2 [Create Custom Docker Network]

create own net name as "psnet"

Subnet range 10.0.0.1/16 in CIDR format.

Command for check docker network list:

docker network ls

Docker network create command:

docker network create --driver bridge --subnet 10.0.0.1/16  psnet

Step: 3 [Launch MySQL Container using own Network]

Create database with own driver (database- container name)...also provide required enviromental variable

Launch MySQL container using custom networks & adding environmental variables & Attach Host folder(Mount volume) Default folder of MySQL storage is /var/lib/mysql:

docker run -dit --name database --network psnet -v /mydata:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=pratik55  -e MYSQL_DATABASE=mydatabase  -e MYSQL_USER=jack  -e MYSQL_PASSWORD=jack11 mysql

Inspect command for check:(here we see our Subnet range(10.0.0.1/16) to our given database container)

docker inspect database   

Here, check provided Subnet range.

Step: 4 [Launch Wordpress Container using own Newtwork]

Launch wordpress and uase PATTING to make outside world connection,As port number of container is 80.

Command for check list port numbers on system:

netstat -tnlp

Lanuch Wordpress container using custom network:

docker run -dit --name mywordpress --network psnet -p 1234:80 wordpress

Wordpress store all iformation of login with database info place in /var/www/html there is file that wp-config.php (here we can also able to attach Host folder that mount volume)

docker run -dit --name mywordpress -v /wordstorage:/var/www/html --network psnet -p 1234:80 wordpress

Can also check MYWORDPRESS has our subnet range by command on above screenshots.(step no.3)

docker inspect mywordpress

Step: 5 [Edit Inbound rule/ Firewall]

EC2 Intance has Firewall which cannot be connected by outside world, so we can modify Inbound rule(All traffic allowed)

Substeps:

1. EC2 Dashboard
2. Celect securtity option
3. Go inside Security groups
4. Select "edit inbound rule"
5. Delete defult rule and new rule
6. custom TCP ->> "ALL TRAFIC", ANYWHERE IPv4
7. Save rule

Step: 6 [Access Wordpress from Browser]

Instance public + our port number that provide in wordpress contanier.

To access wordpresss from browser,need EC2 instance public IP Address+Port no. given to wordpresss container.

To get wordpress interface on google ,provide details that provided in the form of enviromental variable during "database" caintainer launch

http://65.2.146.158:1234 <<------- see interface(This site does not work as instance is terminated now)

Step: 7 [Fill Info]

Create username and password to create blog on wordpress:

Step: 8 [Create Blog page]

On Wordpress Dashboard->create Post->Add Content->Publish->Copy link and paste in the browser.

This is Three Tier Architecture using Docker Overview:

1. WordPress-Blogging Site
2. MySQL-Database
3. PSNet-Own Bridge driver