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OpenShift

OpenShift

OpenShift

OpenShift Origin is a distribution of Kubernetes optimized for continuous application development and multi-tenant deployment. It adds developer and operations-centric tools on top of Kubernetes to enable rapid application development, easy deployment and scaling, and long-term lifecycle maintenance for small and large teams.

Features:

  • Easily build applications with integrated service discovery and persistent storage.
  • Quickly and easily scale applications to handle periods of increased demand.
    • Support for automatic high availability, load balancing, health checking, and failover.
  • Push source code to your Git repository and automatically deploy containerized applications.
  • Web console and command-line client for building and monitoring applications.
  • Centralized administration and management of an entire stack, team, or organization.
    • Create reusable templates for components of your system, and iteratively deploy them over time.
    • Roll out modifications to software stacks to your entire organization in a controlled fashion.
    • Integration with your existing authentication mechanisms, including LDAP, Active Directory, and public OAuth providers such as GitHub.
  • Multi-tenancy support, including team and user isolation of containers, builds, and network communication.
    • Allow developers to run containers securely with fine-grained controls in production.
    • Limit, track, and manage the developers and teams on the platform.
  • Integrated Docker registry, automatic edge load balancing, cluster logging, and integrated metrics.

Start a local OpenShift all-in-one cluster

The quickest way to try out OpenShift on your own computer is using the oc cluster up command. First, install the dependencies. We’ll need Docker and the origin-clients that provides the oc binary.

$ sudo dnf install origin-clients docker

Note: we recommend following the steps in the Docker installation page to add your user to the docker group, so that you can run the docker command without sudo.

Now, let’s start our local all-in-one cluster. The command oc cluster up takes care of everything:

$ oc cluster up
-- Checking OpenShift client ... OK
-- Checking Docker client ... OK
-- Checking Docker version ... OK
-- Checking for existing OpenShift container ... OK
-- Checking for openshift/origin:v1.3.1 image ...
   Pulling image openshift/origin:v1.3.1
   Pulled 0/3 layers, 3% complete
   Pulled 1/3 layers, 71% complete
   Pulled 2/3 layers, 86% complete
   Pulled 3/3 layers, 100% complete
   Extracting
   Image pull complete
-- Checking Docker daemon configuration ... FAIL
   Error: did not detect an --insecure-registry argument on the Docker daemon
   Solution:

     Ensure that the Docker daemon is running with the following argument:
        --insecure-registry 172.30.0.0/16

If you are running a default installation of Docker, you will run into the error above. That is okay. We will follow the suggestion on screen. The good news is that oc cluster up downloaded the Docker image for running OpenShift Origin, so next time we run it, we already have the images offline.

To change the Docker configuration permanently, edit (as the root user) the file /etc/sysconfig/docker and add/uncomment the following line:

INSECURE_REGISTRY='--insecure-registry 172.30.0.0/16'

Then, restart the Docker daemon:

$ sudo systemctl restart docker

And let’s run oc cluster up again:

$ oc cluster up
-- Checking OpenShift client ... OK
-- Checking Docker client ... OK
-- Checking Docker version ... OK
-- Checking for existing OpenShift container ... OK
-- Checking for openshift/origin:v1.3.1 image ... OK
-- Checking Docker daemon configuration ... OK
-- Checking for available ports ... OK
-- Checking type of volume mount ...
   Using nsenter mounter for OpenShift volumes
-- Creating host directories ... OK
-- Finding server IP ...
   Using 10.0.2.15 as the server IP
-- Starting OpenShift container ...
   Creating initial OpenShift configuration
   Starting OpenShift using container 'origin'
   Waiting for API server to start listening
   OpenShift server started
-- Installing registry ... OK
-- Installing router ... OK
-- Importing image streams ... OK
-- Importing templates ... OK
-- Login to server ... OK
-- Creating initial project "myproject" ... OK
-- Server Information ...
   OpenShift server started.
   The server is accessible via web console at:
       https://10.0.2.15:8443

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

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

Done! Follow the instructions on the screen to access the OpenShift Origin Web Console.

Deploying your first application

You can deploy application from the Web Console or from the command line. As a demo and to test your new environment, you can deploy a sample Ruby application:

$ oc new-app https://github.com/openshift/ruby-hello-world
--> Found Docker image 8a8cd6f (43 hours old) from Docker Hub for "centos/ruby-22-centos7"

    Ruby 2.2
    --------
    Platform for building and running Ruby 2.2 applications

    Tags: builder, ruby, ruby22

    * An image stream will be created as "ruby-22-centos7:latest" that will track the source image
    * A Docker build using source code from https://github.com/openshift/ruby-hello-world will be created
      * The resulting image will be pushed to image stream "ruby-hello-world:latest"
      * Every time "ruby-22-centos7:latest" changes a new build will be triggered
    * This image will be deployed in deployment config "ruby-hello-world"
    * Port 8080 will be load balanced by service "ruby-hello-world"
      * Other containers can access this service through the hostname "ruby-hello-world"

--> Creating resources with label app=ruby-hello-world ...
    imagestream "ruby-22-centos7" created
    imagestream "ruby-hello-world" created
    buildconfig "ruby-hello-world" created
    deploymentconfig "ruby-hello-world" created
    service "ruby-hello-world" created
--> Success
    Build scheduled, use 'oc logs -f bc/ruby-hello-world' to track its progress.
    Run 'oc status' to view your app.

You can find more comprehensive walkthroughs in the official documentation under References.

Online Developer Preview

An Online offering of the new OpenShift platform based on Docker and Kubernetes is available as a Developer Preview. For more information visit:

https://www.openshift.com/devpreview/index.html

Once you sign up, you can interact with the cluster in the cloud using the same oc client tool we installed on the previous section. For more information, consult the References below.

References