The wrappers for launching sidecar containers do not work properly for all variations fo router configuration. They currently assume the qrouter namespace, breaking DVR.
The problem is that the L3 agent's wrapper script for launching processes assumes a namespace with the prefix of "qrouter-". If a router is both distributed and HA then the correct namespace is actually prefixed with "snat-" so processes fail to run or end up in the wrong network namespace.
Relevant changes have been merged upstream.
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Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:2574