Chapter 3  Creating Applications OpenShift Container Platform 4.8 Red Hat Customer Portal

This is an interactive install process that guides you through the various
steps. You are installing one master and one node and the domain name is the FQDN
as mentioned at the start of this section, and openshift consulting Before running the installer on the master, set up password-less SSH access as
this is required by the installer to gain access to the machines. The installer for OpenShift Container Platform is provided by the
atomic-openshift-utils package.

If the application has many dependencies and requires many steps to build and run, it is best to use the Docker strategy. For simple, lightweight microservices, Source-To-Image (S2I) is a good option. Take this opportunity to introduce the concept of containers to your team and describe how using them could improve the application’s deployment lifecycle and management on Red Hat OpenShift Container Platform. If not, a simple analogy can help explain how OpenShift Container Platform and containers work together. Transforming your application delivery cycle and shifting from traditional infrastructure to cloud-native can be daunting, however.

Open source

You can override the image the builder uses for a particular source repository by specifying the image, either an image stream or container specification, and the repository with a ~ as a separator. Note that if this is done, build strategy detection and language detection are not carried out. If a Jenkins file exists in the root or specified context directory of the source repository when creating a new application, OpenShift Container Platform generates a pipeline build strategy.

You can configure Curator to delete Elasticsearch data based on retention settings. It is recommended that you set the following default index data retention of 5 days as a default. Routes are assigned a publicly or privately accessible hostname from the router subdomain that external clients can use to send requests to your app.

Create a deployment

Pod-based lifecycle hooks execute hook code in a new Pod derived from the template in a DeploymentConfig. Rolling deployments are the default type in OpenShift Container Platform. If the current revision of your DeploymentConfig failed to deploy, you can restart the deployment process.

Install it using yum on both the master and
the node, after running yum update. This guide introduces you to the basic concepts of OpenShift Container Platform, and helps
you install a basic application. This guide is
not suitable for deploying or installing a production environment of OpenShift.

Running a Pod with a Different Service Account

Both parameters
can be set to either a percentage (e.g., 10%) or an absolute value (e.g.,
2). The ImageChange trigger results in a new deployment whenever the value of an
image stream tag changes. Rollbacks revert an application back to a previous deployment and can be
performed using the REST API or the CLI. DeploymentConfigs cannot be scaled when a rollout is ongoing because the
DeploymentConfig controller will end up having issues with the deployer
process about the size of the new ReplicationController. Because the Deployment controller is the sole source of truth for the sizes of
new and old ReplicaSets owned by a Deployment, it is able to scale ongoing

  • You have the
    option to either create new roles or define a policy that allows anyone to log
    in (to start you off).
  • Red Hat OpenShift gives developers a single, consistent user experience and the freedom to quickly build and deploy apps anywhere using the tools they want.
  • Other patterns include keeping the caches of a DR installation warm, or sampling incoming traffic for analysis purposes.
  • When exploring containerization with your application team, it is important to recognize that containers are not always the most beneficial method.
  • It is important to use secure base images that are up to date and free of known vulnerabilities.
  • Quay, on the other hand, is an enterprise-quality container image registry with advanced registry features, including geo-replication, image scanning, and the ability to roll-back images.

Because you control the portion of requests to each version, as testing progresses you can increase the fraction of requests to the new version and ultimately stop using the previous version. As you adjust the request load on each version, the number of Pods in each service might have to be scaled as well to provide the expected performance. When ready, change the service in the production route to point to the new service and the new (blue) version is live. The responsibility of the strategy is to make the new deployment active using the logic that best serves the needs of the user. During scale up, if the replica count of the deployment is greater than one, the first replica of the deployment will be validated for readiness before fully scaling up the deployment.

Advanced security and compliance

The -i invocation requires that new-app attempt to clone repository to determine what type of artifact it is, so this will fail if Git is not available. This procedure walks through creating a new etcd cluster using the etcd Operator, managed by Operator Lifecycle Manager (OLM). Red Hat OpenShift is part of the Cloud Native Computing Foundation (CNCF) Certified Kubernetes program, ensuring compatibility and interoperability between your container workloads. Volkswagen built a standardized architecture and virtualized, automated test environment for testing components.

Other objects can be generated when instantiating templates, according to the template. Language detection requires the Git client to be locally installed so that your repository can be cloned and inspected. If Git is not available, you can avoid the language detection step by specifying the builder image to use with your repository with the ~ syntax. An expanding ecosystem of partners provides a wide variety of integrations. Third parties deliver additional storage and network providers, IDE, CI, integrations, independent software vendor solutions, and more.

Understand container orchestration

Red Hat OpenShift is trusted by thousands of customers in every industry to deliver business-critical applications, whether they’re migrating existing workloads to the cloud or building new experiences for customers. OpenShift Data Foundation provides accessible data and support for all Red Hat OpenShift apps. Developers can provision storage directly from Red Hat OpenShift without switching to a separate user interface. OpenShift Do (odo) is a CLI tool for developers who are writing, building, and deploying applications on OpenShift. With odo, developers get an opinionated CLI tool that supports fast, iterative development. Odo abstracts away Kubernetes and OpenShift concepts, so developers can focus on what’s most important to them.

Rather, this requires its replica
count to be adjusted by an external auto-scaler. You can perform the upgrade process for OpenShift Data Foundation version 4.9 from OpenShift Container Storage version 4.8 only by installing the OpenShift Data Foundation operator from OpenShift Container Platform OperatorHub. You can create a volume snapshot either from the Persistent Volume Claim (PVC) page or the Volume Snapshots page. Any chosen provisioner plug-in also requires configuration for the relevant cloud, host, or third-party provider as per the relevant documentation. The judgment of which driver (RBD or CephFS) to use is based on the entry in the storageclass.yaml file. You need to specify the keys while performing S3 operations, especially when you read, write or list from the Multicloud Object Gateway (MCG) bucket.

2.1. Accessing the Multicloud Object Gateway from the terminal

As a result of attending this course, you should be able to deploy and update applications in an OpenShift 4 cluster. Using the OpenShift 4 web console, students will be able to build, deploy, troubleshoot, and scale applications. Self-service for application teams to access approved services and infrastructure, with centralized management and administration. Red Hat OpenShift comes with a streamlined, automatic install so you can get up and running with Kubernetes as quickly as possible. Once installed, Red Hat OpenShift uses Kubernetes Operators for push-button, automatic platform updates for the container host, Kubernetes cluster, and application services running on the cluster. Red Hat’s developer tools for Kubernetes simplify your workflow while giving you the capabilities of this powerful platform.

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