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You need mTLS between two hundred services that currently trust the network. Design the rollout.

Turning on strict mTLS across two hundred services in one change breaks everything that talks to something outside the mesh. Permissive mode exists so the migration can be observed instead of guessed at.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Turning on strict mTLS across two hundred services in one change breaks everything that talks to something outside the mesh. Permissive mode exists so the migration can be observed instead of guessed at.

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