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This is the zero downtime approach

Before you begin:

• Set keystoneapache::syncservice_db: false and keystone::manage_service: false globally in hieraSet keystone::enabled: false ensure: 'stopped' in hiera for the node that you plan to run the rolling upgrade from
• Login to a mysql node, start the mysql CLI, and run set global log_bin_trust_function_creators=1;

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