docs: explain userland-proxy impact on published ports - #25813
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dockerd only listed the flag in one line. Describe what docker-proxy does for hairpin/localhost access versus pure NAT when the option is off. Fixes docker#17312 Signed-off-by: Dean Chen <862469039@qq.com>
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--userland-proxyonly had a one-liner on the dockerd page. Added a short section on port publishing: whatdocker-proxyis for (hairpin / host-local published ports), what changes when you set it tofalse, and a daemon.json example.Fixes #17312