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How to automatically resize root device on RHEL7 instance in the flat / vlan network on OpenStack

Solution Verified - Updated 2016-05-20T18:00:42+00:00 -

Issue

When launching custom RHEL7 instance in the flat / vlan network on OpenStack, the size of root device is not automatically resized to fit flavor size.

Environment

Red Hat OpenStack 6.0

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