{"id":11599,"date":"2017-09-30T22:44:44","date_gmt":"2017-09-30T20:44:44","guid":{"rendered":"https:\/\/blog.zhaw.ch\/icclab\/?p=11599"},"modified":"2019-08-05T14:35:06","modified_gmt":"2019-08-05T12:35:06","slug":"migrate-openshift-applications-with-os2os","status":"publish","type":"post","link":"https:\/\/blog.zhaw.ch\/icclab\/migrate-openshift-applications-with-os2os\/","title":{"rendered":"Migrate OpenShift applications with os2os"},"content":{"rendered":"\n

by Josef Spillner<\/a><\/p>\n\n\n

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<\/a>, 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<\/a> must be deployable to different cloud providers as the requirements change, we are proud to announce the first proof of concept release of os2os<\/strong>, a tool to migrate cloud-native applications between OpenShift<\/a> 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.<\/p>\n

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Description of the tool<\/strong><\/p>\n

As other successful tools in the containers ecosystem (Docker<\/a>, Docker Swarm<\/a>, Kubernetes<\/a>, Kompose<\/a>, …), os2os is implemented using the Go<\/a> programming language, opening the path towards sharing features and libraries. The Go library Cobra<\/a> is used to produce a user-friendly command line interface. Internally, os2os uses the openshift command-line tool, oc, which is supposed to be pre-installed, a reasonable assumption for any user wanting to migrate between OpenShift clusters.<\/p>\n

Kompose is a tool which also contributes to solving the portability problem. In this case, Kompose translates Docker Compose files to Kubernetes resources. It is one of the most \u201cstarred or liked\u201d repositories according to the Kubernetes Github page. Trying to be consistent with tools which are tackling comparable problems and making the use easy for e.g. existing Kompose users, os2os offers similar commands which can be learned in few minutes.<\/p>\n

In this first version of os2os, users can access these three commands:<\/p>\n