[Openstack] Upgrade Mitaka to Pike

Hi OpenStackers, I'm planning upgrading my OpenStack System. Currently version is Mitaka, on Ubuntu 14.04.5. I want to upgrade to latest version of Pike. I've read some documents and know that Mitaka does not have Rolling upgrade, which means there will have downtime in upgrade process. Our syst

[Openstack] [OpenStack] Upgrade Mitaka to Pike

Hi OpenStackers, I'm planning upgrading my OpenStack System. Currently version is Mitaka, on Ubuntu 14.04.5. I want to upgrade to latest version of Pike. I've read some documents and know that Mitaka does not have Rolling upgrade, which means there will have downtime in upgrade process. Our syst