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How can I do rolling updates/deployments in a scaled application in Openshift v2?

I know I can access the container (via ssh) and fire a 'gear rotate-out'. But how to push my new version (deployment) to a specific container (Gear)? Can Openshift do this automatically?

When I push an update to a scaled application all the Gears are updated at same time? Is the update transparent to the end users?

Rafael Soares - tuelho
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You can not do rolling updates on OpenShift Online unless you were to write your own script or cartridge to take care of it. You should try using the hot_deploy marker file, this keeps the application running while the new code is deployed.