Docker with AKS & Docker with OpenShift

Docker is a containerization platform that allows you to package applications and their dependencies into lightweight, portable containers that can be easily run and managed on different environments.

Azure Kubernetes Service (AKS) is a managed Kubernetes service that makes it easy to deploy and manage containerized applications on Azure. AKS allows you to create and manage a cluster of virtual machines that are preconfigured to run containerized applications, and provides tools and APIs for deploying and managing those applications.

To use Docker with AKS, you can build your applications as Docker images and then use AKS to deploy those images to a cluster. AKS will then run the images as containers on the cluster, and provide tools for managing and scaling the containers as needed.

To build a Docker image for your application, you can use a Dockerfile, which is a text file that contains instructions for building the image. The Dockerfile specifies the base image that the image is built on, as well as any additional packages, libraries, or files that are needed for the application.

Once you have built your Docker images, you can use AKS to deploy them to a cluster. You can use the Azure portal, Azure PowerShell, or Azure CLI to create an AKS cluster and deploy your images to the cluster, or you can use an infrastructure as code (IaC) tool like Terraform to automate the process.

Overall, using Docker with AKS allows you to easily deploy and manage containerized applications on Azure, making it easier to build and run scalable, reliable applications on the cloud.

Create AKS Cluster using Terraform

To create an Azure Kubernetes Service (AKS) cluster using Terraform, you can use the azurerm_kubernetes_cluster resource in your Terraform configuration files.

Here’s an example of how you might use Terraform to create an AKS cluster:

# Create a resource group for the AKS cluster
resource "azurerm_resource_group" "example" {
  name     = "example-resource-group"
  location = "westus2"
}

# Create an AKS cluster
resource "azurerm_kubernetes_cluster" "example" {
  name                = "example-aks-cluster"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  dns_prefix          = "example-aks-cluster"

  kubernetes_version = "1.19.5"

  agent_pool_profile {
    name           = "default"
    count          = 3
    vm_size        = "Standard_DS2_v2"
    os_type        = "Linux"
    max_pods       = 110
    vnet_subnet_id = "/subscriptions/{SUBSCRIPTION_ID}/resourceGroups/{RESOURCE_GROUP_NAME}/providers/Microsoft.Network/virtualNetworks/{VNET_NAME}/subnets/{SUBNET_NAME}"
  }

  service_principal {
    client_id     = "{CLIENT_ID}"
    client_secret = "{CLIENT_SECRET}"
  }

  role_based_access_control {
    enabled = true
  }
}

In this example, Terraform creates an AKS cluster with the specified name and DNS prefix, and assigns it to the specified resource group. The cluster is configured with three virtual machine nodes and is set up to use role-based access control (RBAC).

You can then use the AKS cluster to deploy and manage containerized applications using tools like kubectl or the Azure portal.

Overall, using Terraform to create an AKS cluster can help you automate the process of provisioning and configuring a Kubernetes cluster on Azure, making it easier to deploy and manage containerized applications on the cloud.

OpenShift cluster with CLI

OpenShift is a container application platform that is built on top of Docker and Kubernetes. It provides a range of tools and features for building, deploying, and managing containerized applications, including support for continuous integration and delivery (CI/CD) pipelines, resource management, and security.

To use Docker with OpenShift, you can build your applications as Docker images and then use OpenShift to deploy those images to a cluster. OpenShift will then run the images as containers on the cluster, and provide tools for managing and scaling the containers as needed.

You can use YAML config maps and secrets in OpenShift to manage configuration data and sensitive information for your applications. Config maps are used to store non-sensitive configuration data, such as application settings or environment variables, while secrets are used to store sensitive data, such as passwords or API keys.

To create a config map or secret in OpenShift, you can use the oc command-line tool or the OpenShift web console. You can then reference the config map or secret in your application’s configuration files or environment variables to use the data in your application.

Overall, using Docker with OpenShift and config maps and secrets allows you to easily deploy and manage containerized applications on OpenShift, making it easier to build and run scalable, reliable applications on the platform.

OpenShift is a Kubernetes-based platform for developing, deploying, and managing containerized applications. OpenShift provides a number of tools and features for building and deploying applications, including support for Docker containers.

In OpenShift, config maps and secrets are used to manage configuration data and sensitive information for applications.

Config maps are used to store non-sensitive configuration data, such as application settings or environment variables. You can create config maps in OpenShift using the oc command-line tool or the OpenShift web console, and then reference the config maps in your application’s configuration files or environment variables to use the data in your application.

Secrets are used to store sensitive data, such as passwords or API keys. You can create secrets in OpenShift using the oc command-line tool or the OpenShift web console, and then reference the secrets in your application’s configuration files or environment variables to use the data in your application.

To create a config map or secret in OpenShift, you can use the oc create configmap or oc create secret command, followed by the name of the config map or secret and the data that you want to store. For example, to create a config map named my-config-map with a single key-value pair, you might use the following command:

oc create configmap my-config-map --from-literal=key=value

To create a secret, you can use a similar command, but replace configmap with secret.

Overall, config maps and secrets are useful tools for managing configuration data and sensitive information in OpenShift, and can help you build applications that are more flexible, secure, and easier to manage.