Odo is a developer-focused command-line interface (CLI) for OpenShift and Kubernetes. This article introduces highlights of the odo 2.0 release, which now integrates with Kubernetes. Additional highlights include the new default deployment method in odo 2.0, which uses devfiles for rapid, iterative development. We've also moved Operator deployment out of experimental mode, so you can easily deploy Operator-backed services from the
odo command line.
Odo 2.0 now works with core Kubernetes!
Odo 2.0 lets you write, build, and deploy applications entirely on Kubernetes. You can use any compliant Kubernetes cluster, whether it's a hosted cloud provider, a self-managed cluster, or hosted locally with a tool like Minikube.
Odo's integration with Kubernetes provides a consistent development experience. You can write applications from scratch, iterate the development inner loop, and commit your code to Git, all within the same environment.
Deploy with devfiles in odo 2.0
This major release establishes devfiles as the default deployment method for odo. Odo still supports Source-to-Image (S2I) deployment for developers who prefer using the
--s2i flag from the command line.
A devfile is a YAML file that is used to define the developer workspace in Eclipse Che. Devfiles have an open format, so we can also use them in
odo. Odo's support for devfiles lets developers easily switch between tools, with no additional configuration. Using devfiles also streamlines the process of adding new language support to
odoand Eclipse Che. Now, you only need to create a devfile from a template and update.
See the odo tutorial for a guide to deploying your first devfile in
A common definition for your developer tools
With the odo 2.0 release, we have aligned on devfiles as the common definition format for developer workspaces and application lifecycles across Red Hat's developer tooling portfolio. Red Hat CodeReady Workspaces (the productized version of Eclispe Che) currently uses devfiles, and all of the OpenShift IDE extensions leverage
odo, bringing iterative development and deployment flows directly to developers. You can try out
odo directly or access it using IDE extensions for VS Code, Eclipse Che, and the Eclipse desktop IDE.
Improved language support
Adding devfiles as the default deployment method improves language support in odo 2.0. To see the list of currently supported devfile components, open your
odo CLI and run:
$ odo catalog list components
Table 1 shows the currently available
odo components, including devfile components.
|java-maven||Upstream Maven and OpenJDK 11||DefaultDevfileRegistry|
|java-openliberty||Open Liberty microservice in Java||DefaultDevfileRegistry|
|java-quarkus||Upstream Quarkus with Java+GraalVM||DefaultDevfileRegistry|
|java-springboot||Spring Boot using Java||DefaultDevfileRegistry|
|nodejs||Stack with NodeJS 12||DefaultDevfileRegistry|
Sample starters for new projects
As another advantage of using devfiles, you can now leverage sample starters to scaffold new projects. Simply use the
odo create command to provide the name of your devfile component. Odo will pull a cloned local copy of a starter from the associated Git repository. Here's an example:
$ odo create nodejs --starter Validation ✓ Checking devfile existence [22411ns] ✓ Checking devfile compatibility [22492ns] ✓ Creating a devfile component from registry: DefaultDevfileRegistry [24341ns] ✓ Validating devfile component [74471ns] Starter Project ✓ Downloading starter project nodejs-starter from https://github.com/odo-devfiles/nodejs-ex.git [479ms] Please use `odo push` command to create the component with source deployed
Debugging with odo
With this release, the
odo debug command has graduated from tech preview. See the odo tutorial for more about debugging application components with the odo CLI or VS Code.
Using Operators for installation
Developers can now deploy Operator-backed services with
odo. Operators provide custom resource definitions (CRDs), which you can use to create service instances—also known as custom resources (CRs), or operands. You can then use these instances in your projects and link them to your components.
Here's an example, using the
etcd Operator to deploy an Etcd cluster:
$ odo catalog list services Operators available in the cluster NAME CRDs etcdoperator.v0.9.4 EtcdCluster, EtcdBackup, EtcdRestore $ odo service create etcdoperator.v0.9.4/EtcdCluster
See the odo tutorial for more about deploying Operator-backed services with odo.Last updated: October 7, 2020