Chapter 5. Running APIcast on Red Hat OpenShift

This tutorial describes how to use APIcast v2 – the dockerized 3scale API Gateway that is packaged for easy installation and operation on Red Hat OpenShift v3.

5.1. Prerequisites

To follow the tutorial steps below, you will first need to configure APIcast in your 3scale Admin Portal as per the APIcast Overview. Make sure Self-managed Gateway is selected as the deployment option in the integration settings. You should have both Staging and Production environment configured to proceed.

5.2. Step 1: Set up OpenShift

If you already have a running OpenShift cluster, you can skip this step. Otherwise, continue reading.

For production deployments you can follow the instructions for OpenShift installation. In order to get started quickly in development environments, there are a couple of ways you can install OpenShift:

In this tutorial the OpenShift cluster will be installed using:

  • Red Hat Enterprise Linux (RHEL) 7
  • Docker containerized environment v1.10.3
  • OpenShift Origin command line interface (CLI) - v1.3.1

5.2.1. Install the Docker containerized environment

Docker-formatted container images provided by Red Hat are released as part of the Extras channel in RHEL. To enable additional repositories, you can use either the Subscription Manager, or yum config manager. See the RHEL product documentation for details.

For a RHEL 7 deployed on a AWS EC2 instance we’ll use the following the instructions:

  1. List all repositories:

    sudo yum repolist all

Find the *-extras repository.

  1. Enable extras repository:

    sudo yum-config-manager --enable rhui-REGION-rhel-server-extras
  2. Install Docker-formatted container images:

    sudo yum install docker docker-registry
  3. Add an insecure registry of 172.30.0.0/16 by adding or uncommenting the following line in /etc/sysconfig/docker file:

    INSECURE_REGISTRY='--insecure-registry 172.30.0.0/16'
  4. Start the Docker containerized environment:

    sudo systemctl start docker

You can verify that the Docker containerized environment is running with the command:

sudo systemctl status docker

5.2.2. Start OpenShift cluster

Download the latest stable release of the client tools (openshift-origin-client-tools-VERSION-linux-64bit.tar.gz) from OpenShift releases page, and place the Linux oc binary extracted from the archive in your PATH.

Note
  • Please be aware that the oc cluster set of commands are only available in the 1.3+ or newer releases.
  • the docker command runs as the root user, so you will need to run any oc or docker commands with root privileges.

Open a terminal with a user that has permission to run docker commands and run:

oc cluster up

At the bottom of the output you will find information about the deployed cluster:

    -- Server Information ...
      OpenShift server started.
      The server is accessible via web console at:
      https://172.30.0.112:8443

      You are logged in as:
        User:     developer
        Password: developer

      To login as administrator:
        oc login -u system:admin

Note the IP address that is assigned to your OpenShift server, we will refer to it in the tutorial as OPENSHIFT-SERVER-IP.

5.2.2.1. Setting up OpenShift cluster on a remote server

In case you are deploying the OpenShift cluster on a remote server, you will need to explicitly specify a public hostname and a routing suffix on starting the cluster, in order to be able to access the OpenShift web console remotely.

For example, if you are deploying on an AWS EC2 instance, you should specify the following options:

oc cluster up --public-hostname=ec2-54-321-67-89.compute-1.amazonaws.com --routing-suffix=54.321.67.89.xip.io

where ec2-54-321-67-89.compute-1.amazonaws.com is the Public Domain, and 54.321.67.89 is the IP of the instance. You will then be able to access the OpenShift web console at https://ec2-54-321-67-89.compute-1.amazonaws.com:8443.

5.3. Step 2: Deploy APIcast using the OpenShift template

  1. By default you are logged in as developer and can proceed to the next step.

    Otherwise login into OpenShift using the oc login command from the OpenShift Client tools you downloaded and installed in the previous step. The default login credentials are username = "developer" and password = "developer":

    oc login https://OPENSHIFT-SERVER-IP:8443

    You should see Login successful. in the output.

  2. Create your project. This example sets the display name as gateway

    oc new-project "3scalegateway" --display-name="gateway" --description="3scale gateway demo"

    The response should look like this:

    Now using project "3scalegateway" on server "https://172.30.0.112:8443".

    Ignore the suggested next steps in the text output at the command prompt and proceed to the next step below.

  3. Create a new Secret to reference your project by replacing <access_token> and <domain> with yours.

    oc secret new-basicauth apicast-configuration-url-secret --password=https://<access_token>@<domain>-admin.3scale.net

    Here <access_token> is an Access Token (not a Service Token) for the 3scale Account Management API, and <domain>-admin.3scale.net is the URL of your 3scale Admin Portal.

    The response should look like this:

    secret/apicast-configuration-url-secret
  4. Create an application for your APIcast Gateway from the template, and start the deployment:

    oc new-app -f https://raw.githubusercontent.com/3scale/3scale-amp-openshift-templates/2.0.0.GA-redhat-2/apicast-gateway/apicast.yml

    You should see the following messages at the bottom of the output:

    --> Creating resources with label app=3scale-gateway ...
        deploymentconfig "apicast" created
        service "apicast" created
    --> Success
        Run 'oc status' to view your app.

5.4. Step 3: Create routes in OpenShift console

  1. Open the web console for your OpenShift cluster in your browser: https://OPENSHIFT-SERVER-IP:8443/console/

    Use the value specified in --public-hostname instead of OPENSHIFT-SERVER-IP if you started OpenShift cluster on a remote server.

    You should see the login screen:

    OpenShift Login Screen
    Note

    You may receive a warning about an untrusted web-site. This is expected, as we are trying to access the web console through secure protocol, without having configured a valid certificate. While you should avoid this in production environment, for this test setup you can go ahead and create an exception for this address.

  2. Log in using the developer credentials created or obtained in the Setup OpenShift section above.

    You will see a list of projects, including the "gateway" project you created from the command line above.

    Openshift Projects

    If you do not see your gateway project, you probably created it with a different user and will need to assign the policy role to to this user.

  3. Click on "gateway" and you will see the Overview tab.

    OpenShift downloaded the code for APIcast and started the deployment. You may see the message Deployment #1 running when the deployment is in progress.

    When the build completes, the UI will refresh and show two instances of APIcast ( 2 pods ) that have been started by OpenShift, as defined in the template.

    Building the Gateway

    Each APIcast instance, upon starting, downloads the required configuration from 3scale using the settings you provided on the Integration page of your 3scale Admin Portal.

    OpenShift will maintain two APIcast instances and monitor the health of both; any unhealthy APIcast instance will automatically be replaced with a new one.

  4. In order to allow your APIcast instances to receive traffic, you’ll need to create a route. Start by clicking on Create Route.

    Create Route

    Enter the same host you set in 3scale above in the section Public Base URL (without the http:// and without the port) , e.g. gateway.openshift.demo, then click the Create button.

    Configure Route

    Create a new route for every 3scale service you define. Alternatively, you could avoid having to create a new route for every 3scale service you define by deploying a wildcard router.

5.4.1. Configure wildcard domains (technical preview)

Technical preview: Note that the wildcard router is currently a technical preview feature.

5.4.1.1. Pre-requisites

Use of the wildcard domain feature requires the following:

  • OpenShift version 3.4
  • a wildcard domain that is not being used for any other routes, or as another project’s namespace domain
  • your router must be configured to allow wildcard routes

5.4.1.2. Steps

Perform the following steps to configure a wildcard domain:

  1. From a terminal session, log in to OpenShift: oc login
  2. Create a wildcard router configured with your wildcard domain
  3. Download the wildcard.yml template from the latest release in this GitHub repository.
  4. Switch to the project which contains your AMP deployment: oc project <project_name>
  5. Enter the oc new-app command, specifying the following:

    • the -file option and the path to the wildcard.yml template
    • the --param option and the WILDCARD_DOMAIN of your openshift cluster
    • the --param option and the TENANT_NAME from the project which contains your AMP deployment

      oc new-app -f wildcard.yml --param WILDCARD_DOMAIN= guide.
  6. Run OpenShift V3 on your dedicated datacenter or on your favorite cloud platform using the advanced installation documentation listed above.
  7. Register a custom domain name for your API services, and configure your API integration in 3scale Admin Portal, and in OpenShift by adding new routes.
  8. Learn more about OpenShift from the OpenShift documentation