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Cloud & infrastructure · #openstack
Live migration enables zero-downtime OpenStack maintenance, but only if you pick the right mode, storage layout, and CPU baseline. Here's how to decide and verify.
Step-by-step guide for live migrating running OpenStack Nova instances between compute hosts using shared storage (Ceph, NFS, iSCSI). Covers prerequisites, migration commands, monitoring, verification, and recovery from common failures.
Learn how to back up OpenStack Cinder volumes instantly with snapshots, export them to Glance, and automate the process—complete with commands, trade‑offs, and a step‑by‑step example.
Learn how to configure OpenStack Cinder Volume Backups to move critical data from block storage to an independent object store for disaster recovery.
Learn how Nova’s filter and weight plugins control host selection, how to add your own logic, and what pitfalls to avoid when tuning scheduling for large OpenStack clouds.
A concise architecture note for OpenStack Nova live migration: requirements, minimal two‑node design, trust boundaries, pre‑migration checks, typical failure modes, and conditions that force a design change.
Learn how to configure, execute, and verify OpenStack live migration of VM instances, including requirements, a step‑by‑step example, and key limitations.
Learn how to shelve an instance to shared storage, free its compute host, and later unshelve it safely, with verification steps and known limitations.
Learn how to implement SAML2 federated identity in OpenStack Keystone to allow external authentication without storing local passwords, including mapping rules and failure diagnostics.