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Docker Engine 29 upgrade: breaking changes that can affect production hosts

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Docker Engine 29 was released in November 2025, and its 29.x line is now available through Docker's apt repository for supported Ubuntu releases. Routine patching can pull the upgrade onto older 28.x hosts overnight, which may leave reverse proxies unable to discover containers. The new release raises the minimum accepted client API version to 1.44, so older proxies, monitoring agents, and CI tooling may be rejected. Fresh installs default to the containerd image store, while existing hosts keep their current graph driver, and major upgrades are not covered by live-restore. The article recommends pinning the package, auditing API clients, testing on a canary host first, and fixing the storage configuration in daemon.json.

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