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We replaced Docker with containerd on every node. What did we actually gain, and what runs underneath now?

Dockershim is gone and the CRI contract decides what a runtime must do. The senior-level part is the shim model: a supervisor process that owns exit codes and stdio so the daemon can die without taking workloads with it.

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.

Dockershim is gone and the CRI contract decides what a runtime must do. The senior-level part is the shim model: a supervisor process that owns exit codes and stdio so the daemon can die without taking workloads with it.

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Next in this trackOne tag has to serve amd64 nodes and Graviton nodes. How does a single image reference do that?Next in this trackPrivate registry pulls started failing ImagePullBackOff overnight. Walk me through the credential chain.Next in this trackYour operator is the top API consumer and etcd is sweating. Explain informers, resourceVersion and the real cost of LIST.
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