Book Image

Learn OpenShift

By : Denis Zuev, Artemii Kropachev, Aleksey Usov
Book Image

Learn OpenShift

By: Denis Zuev, Artemii Kropachev, Aleksey Usov

Overview of this book

Docker containers transform application delivery technologies to make them faster and more reproducible, and to reduce the amount of time wasted on configuration. Managing Docker containers in the multi-node or multi-datacenter environment is a big challenge, which is why container management platforms are required. OpenShift is a new generation of container management platforms built on top of both Docker and Kubernetes. It brings additional functionality to the table, something that is lacking in Kubernetes. This new functionality significantly helps software development teams to bring software development processes to a whole new level. In this book, we’ll start by explaining the container architecture, Docker, and CRI-O overviews. Then, we'll look at container orchestration and Kubernetes. We’ll cover OpenShift installation, and its basic and advanced components. Moving on, we’ll deep dive into concepts such as deploying application OpenShift. You’ll learn how to set up an end-to-end delivery pipeline while working with applications in OpenShift as a developer or DevOps. Finally, you’ll discover how to properly design OpenShift in production environments. This book gives you hands-on experience of designing, building, and operating OpenShift Origin 3.9, as well as building new applications or migrating existing applications to OpenShift.
Table of Contents (24 chapters)

Technical requirements

For this section, we will have to make use of Vagrant to demonstrate the difference between these methods, as we will require two VMs: one for single-node OpenShift cluster, and the other for the FreeIPA server. Use the following Vagrantfile to spin up an environment:

$ cat Vagrantfile 
$lab_idm = <<SCRIPT
cat <<EOF >> /etc/hosts
172.24.0.11 openshift.example.com openshift
172.24.0.12 idm.example.com idm
EOF
sed -i '/^127.0.0.1.*idm.*$/d' /etc/hosts
yum -y update
yum -y install ipa-server
systemctl restart dbus
ipa-server-install -r IDM.EXAMPLE.COM -n idm.example.com -p idmsecret -a idmsecret --unattended
echo idmsecret | kinit admin
echo supersecret | ipa user-add alice --first Alice --last Springs --password
SCRIPT

$lab_openshift = <<SCRIPT
cat <<EOF >> /etc/hosts
172.24.0.12 idm.example.com idm
EOF
yum -y update
yum install...