Why Use Keycloak?
Keycloak is a powerful open-source identity provider (IdP) that enables single sign-on (SSO) functionality. An IdP is a tool used to create, manage, and maintain identity information for principals and provides authentication services for applications across a distributed network. With Keycloak, you can easily create multiple security policy domains, known as realms, to manage users, applications, roles, and groups. It also allows you to register multiple users for the same application.
One of the key advantages of Keycloak is its flexibility in configuration. You can configure Keycloak either through its user-friendly Admin Console or by using the Command Line Interface (CLI) commands.
Keycloak has a wide range of use-cases, including:
1. Integration in a Kubernetes Cluster for authentication
2. Setting up Keycloak to enable login with social networks
3. Using Keycloak as an identity broker for another IdP
This article provides a detailed guide on setting up Keycloak on an AWS EC2 instance and making it publicly accessible through the internet.
Step 1: Setting up the EC2 Instance
The main focus of this article is on setting up Keycloak on an AWS EC2 instance, rather than the process of launching an EC2 instance. However, the article covers three different methods to configure and launch the EC2 instance to cater to different preferences and provide a clear understanding of the required resources.
If you are looking to set up the necessary resources quickly and want scripts for easy reproduction, it is recommended to skip parts 1.1 and 1.2 and proceed directly to part 1.3.
1.1 Using the Web Interface
1.1.1 Create the EC2 Instance for the First Time
Launching the EC2 instance through the web interface is the most user-friendly option. You can follow the official documentation on how to create an AWS EC2 instance. However, the following steps provide a brief overview of the instance configuration process:
– Log into your AWS account and navigate to the EC2 service.
– Click on “Launch Instance.”
– Choose the appropriate instance configuration, such as a T2 micro instance with the minimum disk space.
– Select the desired Amazon Machine Image (AMI) and configure other instance settings, including networking and security.
– Customize the storage capacity if needed.
– In the “Advanced details” section, add the code snippet to install Docker and Postgres at launch.
1.1.2 Create and Use a Launch Template
To easily reproduce the same set-up in the future, you can create a launch template from the initial instance. This launch template can be used to launch new instances with the same configuration.
1.2 Using AWS CLI Commands
If you are comfortable with using AWS CLI commands, you can set up the EC2 instance using the command line interface.
1.2.1 Set up the Instance for the First Time
Configure your AWS CLI with the relevant credentials and region, and then use the CLI commands to create the EC2 instance, security group, and other required resources.
1.2.2 Using a Launch Template for Reproducibility
To simplify the process of reproducing the same set-up, you can create a launch template from the existing instance using AWS CLI commands.
1.3 Create the EC2 Instance with Terraform
Alternatively, you can use Terraform to create all the necessary resources from scratch. Terraform allows you to manage and provision infrastructure as code.
By following the Terraform script provided in the article, you can easily create the EC2 instance and other required resources.
Remember that if you are using Terraform, it is important to ensure that you have an AWS SSH key already created in your desired region.
Conclusion
Keycloak is an excellent choice for implementing identity provider functionality with single sign-on capabilities. By following the steps outlined in this article, you can set up Keycloak on an AWS EC2 instance and make it accessible via the internet. Whether you choose to use the web interface, AWS CLI commands, or Terraform, Keycloak provides the flexibility and scalability you need for effective identity management in your distributed network.