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In the meanwhile I found some more information like [1].

I understood that devstack downloads the binaries from github as distros
don't have the latest version available. But the binaries for s390x are
not yet provided there. I opened a issue to figure out what would need
to be done to get the s390x binary posted as well[2].

If that is not working, we might need to start thinking in a different
direction, e.g. 

- enhance devstack build etcd3 from source (for certain architectures)
- check that etcd3 is already installed (we could install it upfront on
our systems)

I opened a bug against devstack to track the discussion [3]



[1] https://review.openstack.org/#/c/467436/
[2] https://github.com/coreos/etcd/issues/7978
[3] https://bugs.launchpad.net/devstack/+bug/1693192


-- 
-----
Andreas 
IRC: andreas_s



On Mi, 2017-05-24 at 13:48 +0200, Andreas Scheuring wrote:
> Hi together, 
> 
> recently etcd3 was enabled as service in devstack [1]. This breaks
> devstack on s390x Linux, as there are no s390x binaries availabe and
> there's no way to disable the etcd3 service.
> 
> I pushed a patch to allow disabling the etcd3 service in local.conf [2].
> It would be great if we could get that merged soon to get devstack going
> again. It seems like that is not used by any of the default services
> (nova, neutron, cinder,...) right now.
> 
> In the long run I would like to understand the plans of etcd3 in
> devstack. Are the plans to make the default services dependent on etcd3
> in the future?
> 
> Thanks a lot!
> 
> Andreas
> 
> 
> [1]
> https://github.com/openstack-dev/devstack/commit/546656fc0543ec2bc5b422fd9eee17f1b8122758
> [2] https://review.openstack.org/467597
> 
> 
>