One of the desirable properties which users expect in a modern cloud-hosted application is portability. Users want to migrate portable applications between private and public clouds or between different cloud regions. With container images as portable application implementations and emerging sophisticated container runtimes, this should be an easy task. But when a containerised application starts to become more complex, a container platform or an orchestration tool needs to be deployed. This add specifics blueprints and together with the persistent data makes the migration of the application tough. This means that the application is not in a condition to be moved as easily between clouds or even between the orchestration tools or container platforms, losing the desirable portability property. With the idea in mind that the next generation of Cloud-Native Applications must be deployable to different cloud providers as the requirements change, we are proud to announce the first proof of concept release of os2os, a tool to migrate cloud-native applications between OpenShift installations. While our research on application migration is not limited to this single container platform, we see it as one of the more popular and technically interesting ones.
How are cloud-native applications engineered? In contrast to the increasing popularity of the topic, there are surprisingly few reference applications available. In the previous blogpost we described a first version of a prototypical document management application consisting of composed containers which is called ARKIS Microservices. We elaborated on the challenges involved when designing and developing a cloud-native application. In addition, we showed some details about the architecture and functionalities of version 2.5 of this generic reference application .
In this blogpost, we now dive deeper into the architecture of the latest version 3.3, paying attention to each component. The document management software is a cloud-native application based on a microservices architecture. The software permits multiple tenants to manage their documents (create, read, update, delete and search patterns in documents). It manages the different tenants and offers different isolation models to store the documents of a tenant. Furthermore, the services are discoverable through declarative service descriptions, and their use is billed according to a pay-per-use scheme.
Document management is an established software-powered business domain. As with most software applications, an ongoing trend is to move the functionality of document management systems (DMS) and related functionality (Enterprise Content Management – ECM, Content Services – CS) into well-defined services, primarily in cloud environments, resulting in cloud-native document management systems/services (CNDMS).
In the context of the research initiative on cloud-native applications and the ARKIS project within the Service Prototyping Lab, we have been looking deeper into the issues surrounding cloud-native document management and have built a prototype implementation to test-drive any ideas and new concepts. This post introduces the software and the challenges already solved with it. Continue reading
The goal of the Cloud Robotics initiative of the SPLab is to ease the integration of Cloud Computing and Robotics workloads. One of the first things we need to sort out is how to leverage different networking models available on the cloud to support these mixed workloads.
In this blog post we’ll see one little handy trick to have ROS nodes run as pods (and services) in any Kubernetes cluster so that they can transparently communicate using a ROS topic.