OpenStack Upgrade Process Overview
Detailed overview of the OpenStack upgrade process from RHEL 6 to RHEL 7, including strategies for upgrading control planes, high-level upgrade steps, database migration strategies, complications, and more.
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Presentation Transcript
Juno to Ocata Jacob Estelle
Where we started Multiple control planes across multiple clusters Juno Nova, Keystone, Glance, and Horizon RHEL 6 Only supports old version of Libvirt MySQL DB User Syncer 2
High-Level Strategy Upgrade the HVs from RHEL 6 to 7 for Libvirt This can be done months before Ocata upgrade Re-image the control plane to RHEL 7 Migrate the DB Deploy Ocata to the control plane and HVs Repeat steps for each cluster 3
HV Upgrade For Libvirt Non-destructive Nova instances stored on separate partition Automated Important for clusters with thousands of HVs Main source of downtime Re-imaging can take a couple of hours Possible to avoid this by migrating instances to other HVs during upgrade 4
Control Plane Upgrade Part 1 Stop all OpenStack-related services Keystone, Nova, Glance, Horizon, and user syncer Clean up the DB Remove lazy-deleted instances (for speed) Remove instances stuck in transition state (required) Do the DB migration to Ocata 5
Control Plane Upgrade Part 2 Re-image control plane to RHEL7 Deploy Ocata OpenStack components API components on freshly re-imaged host Nova-compute on top of Juno HV Start all OpenStack-related services Ensure everything works Add cluster to Horizon 6
Database Migration: Strategy Simple at a high-level N N+1 is doable By induction, upgrade to any version For release in range(Kilo, Ocata) Download and install $release Run DB migration command 7
DB Migration: Complications Old versions of python packages are either broken or missing Commands to upgrade change with version Order in which you run those commands matter Expectation to bring up a cluster after upgrade Know which extra, special commands you need to run Kilo Nova forgot to add one of these special commands 8
Other Migrations Migrating customizations Configuration, plugins, and patches The Nova Network to Neutron migration Ain t nobody got time for that! Force Nova Network to work with CellsV2 9
Retrospect Downtime was minimal Time to re-image and deploy Ocata What upstream might improve DB migration quirks Backwards compatibility in general Future work Migrating Nova Network to Neutron Ironic cluster migration (includes Neutron) wiki.openstack.org/wiki/Fast_forward_upgrades 10
Questions JacobEstelle@oath.com 11
