Welcome to the terraform challenge series. In this challenge, we will implement a simple LAMP stack using terraform and docker.

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Architecture Diagram

Challenge

We will implement a simple LAMP stack using terraform and docker.

The requirements in detail:

• Install terraform binary version=1.1.5 on iac-server

• The Docker provider has already been configured using the kreuzwerker/docker provider. Check out the provider. tf given at /root/code/terraform-challenges/challenge2

Create a terraform resource named php-httpd-image for building a docker image with the following specifications:

• Image name: php-httpd: challenge

• Build context: lamp_stack/php_httpd

• Labels: challenge: second

Create a terraform resource named mariadb-image for building a docker image with the following specifications:

• Image name: mariadb: challenge

• Build context: lamp_stack/custom_db

• Labels: challenge: second

Define a terraform resource php-httpd for creating a docker container with the following specifications:

• Container Name: webserver

• Hostname: php-httpd

• Image used: php-httpd: challenge

• Attach the container to the network my_network

• Publish a container's port(s) to the host:
  Host port: 0.0.0.0:80
  containerPort: 80

• Labels: challenge: second

• Create a volume with host_path /root/code/terraform-challenges/challenge2/lamp_stack/website_content/ and container_path /var/www/html within the webserver container.

Define a terraform resource phpmyadmin for docker container with the following configurations:

• Container Name: db_dashboard

• Image Used: phpmyadmin/phpmyadmin

• Hostname: phpmyadmin

• Attach the container to the network my_network

• Publish a container's port(s) to the host:
  Host port: 0.0.0.0:8081
  containerPort: 80

• Labels: challenge: second

• Establish link-based connectivity between db and db_dashboard containers (Deprecated)

• Explicitly specify a dependency on mariadb terraform resource

Define a terraform resource mariadb for docker container with the following configurations:

• Container Name: db

• Image Used: mariadb: challenge

• Hostname: db

• Attach the container to the network my_network

• Publish a container's port(s) to the host:
  Hostport: 0.0.0.0:3306
  containerPort: 3306

• Labels: challenge: second

• Define environment variables inside mariadb resource:
  MYSQL_ROOT_PASSWORD=1234
MYSQL_DATABASE=simple-website

• Attach volume mariadb-volume to /var/lib/mysql a directory within db container.

Create a terraform resource named mariadb_volume creating a docker volume with name=mariadb-volume

Solution:

1. Install terraform binary version=1.1.5 on iac-server

curl -L -o /tmp/terraform_1.1.5_linux_amd64.zip https://releases.hashicorp.com/terraform/1.1.5/terraform_1.1.5_linux_amd64.zip
unzip -d /usr/local/bin /tmp/terraform_1.1.5_linux_amd64.zip

2. Check out the provider. tf

cd /root/code/terraform-challenges/challenge2
cat provider.tf

Let's initialize the provider now.

terraform init

You should now refer to the documentation for this provider. Go to the Terraform Registry and paste kreuzwerker/docker into the search bar.

3. Create a terraform resources

main.tf

#Terraform resource named php-httpd-image
resource "docker_image" "php-httpd-image" {
  name = "php-httpd:challenge"
  build {
    path = "lamp_stack/php_httpd"
    tag  = ["php-httpd:challenge"]
    label = {
      challenge : "second"
    }
  }
}
#Terraform resource named mariadb-image
resource "docker_image" "mariadb-image" {
  name = "mariadb:challenge"
  build {
    path = "lamp_stack/custom_db"
    tag  = ["mariadb:challenge"]
    label = {
      challenge : "second"
    }
  }
}
#Terraform resource php-httpd for creating docker container
resource "docker_container" "php-httpd" {
  name     = "webserver"
  image    = docker_image.php-httpd-image.name
  hostname = "php-httpd"
  networks_advanced {
    name = docker_network.private_network.id
  }
  ports {
    internal = 80
    external = 80
    ip       = "0.0.0.0"
  }
  labels {
    label = "challenge"
    value = "second"
  }
  volumes {
    container_path = "/var/www/html"
    host_path      = "/root/code/terraform-challenges/challenge2/lamp_stack/website_content/"
  }
}
#Terraform resource phpmyadmin for docker container
resource "docker_container" "phpmyadmin" {
  name     = "db_dashboard"
  image    = "phpmyadmin/phpmyadmin"
  hostname = "phpmyadmin"
  networks_advanced {
    name = docker_network.private_network.id
  }
  ports {
    internal = "80"
    external = "8081"
    ip       = "0.0.0.0"
  }
  labels {
    label = "challenge"
    value = "second"
  }
  links = [
    docker_container.mariadb.name
  ]
  depends_on = [
    docker_container.mariadb
  ] 
}
#Terraform resource named private_network
resource "docker_network" "private_network" {
  name       = "my_network"
  attachable = true
  labels {
    label = "challenge"
    value = "second"
  }
}
#Terraform resource mariadb for creating docker container
resource "docker_container" "mariadb" {
  name     = "db"
  image    = docker_image.mariadb-image.name
  hostname = "db"
  networks_advanced {
    name = docker_network.private_network.id
  }
  ports {
    internal = 3306
    external = 3306
    ip       = "0.0.0.0"
  }
  labels {
    label = "challenge"
    value = "second"
  }
  env = [
    "MYSQL_ROOT_PASSWORD=1234",
    "MYSQL_DATABASE=simple-website"
  ]
  volumes {
    container_path = "/var/lib/mysql"
    volume_name    = docker_volume.mariadb_volume.name
  }
}
#Terraform resource named mariadb_volume
resource "docker_volume" "mariadb_volume" {
  name = "mariadb-volume"
}

Thank you so much for taking your valuable time to read

I took the initiative to learn in public and share my work with others. I tried my level best in squeezing as much information as possible in the easiest manner.

Hope you learned something new today :)

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