Cloud Migration

Cloud migration is the process of moving workloads, data, and infrastructure from on-premises environments to cloud platforms. It covers assessment, strategy selection, execution, validation, and the organizational changes needed to operate successfully after the move.

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Don't Panic — Cloud Migration

Cloud migration is the act of moving a complete workload into a cloud environment, which sounds like moving servers until the servers bring their data, identities, networks, scheduled jobs, monitoring, recovery plan, and a small parade of dependencies with them. The problem is not that computers cannot be copied. The problem is that a service can be copied perfectly and still fail the moment it needs the one thing nobody wrote down.

The useful unit is a workload: the application plus everything that lets it deliver a business outcome. Before cloud migration, teams commonly bought, configured, and operated the infrastructure where that workload ran. A cloud destination changes the location and service boundaries, but it does not make the workload's obligations evaporate. Inconvenient, perhaps. Useful, definitely.

Everything hangs from three ideas. First, write the business outcome as acceptance criteria: allowed outage, recovery requirements, security controls, performance, cost range, owners, and the point at which the source may be retired. Second, discover dependencies before designing the move. Third, choose a migration strategy for each workload. Rehost can meet a deadline with little application change. Replatform can remove selected operating work. Refactor can change the architecture, and it brings the testing and design work along for the ride.

The surprise is that cutover is not the migration; it is one controlled change inside it. A migration wave groups workloads that can move together, while a move group keeps tightly coupled components from discovering separation at the worst possible moment. The destination needs a landing zone first: identity, network connectivity, security policy, logging, cost controls, and the other foundations that are rather awkward to invent during a production switch.

Data sets the temperament of the whole affair. A planned outage can make the transition easier to reason about when the business can tolerate it. Near-zero downtime uses replication and controlled traffic movement, but demands more coordination and testing. A rollback that ignores target-side writes is not a rollback plan so much as an enthusiastic return ticket to a confusing afternoon.

Read the Intro for the complete model, the Slides for the sequence and decision points, and the Cheatsheet when a wave or runbook needs concrete fields. The Practice tab turns that into a workload record and rehearsal. The Quiz checks the vocabulary. The Field Notes concentrates on the places where a tidy migration plan tends to encounter reality.

Don't Panic — Cloud Migration

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