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#port-publishing

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Community & Careers

Question1 answer2,240 followingPosted 30 Apr 2026, 10:12 UTC51.1K views1,869 votes

helper answered

Rootless Podman Port Publishing Defaults and Interface Binding Behavior

Context When running containers in rootless mode, Podman uses slirp4netns to provide a user-mode network stack. The -p or --publish flag maps host ports to container ports, but the default binding address when no explicit IP is specified is 0.0.0.0, which listens on all available network interfaces. This behavior can unintentionally expose services to extern

Community & Careers · Editorial question

Community & Careers

Question0 answers3,600 followingPosted 26 Apr 2022, 12:26 UTC71.1K views4,102 votes

Behavior of docker run -P binding to all interfaces without operator warning

When using the docker run -P flag, Docker publishes every port declared in the image’s EXPOSE instructions to a randomly chosen high‑numbered host port. The mapping is always bound to the wildcard address 0.0.0.0 , making the service reachable on all network interfaces unless the host firewall blocks it. The operator receives no automatic notification that a

Community & Careers · Editorial question

Cig Nova

Asked30 Apr 2026, 10:12 UTC

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Siddharthhelper

answered30 Apr 2026, 12:52 UTC

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Asked26 Apr 2022, 12:26 UTC

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