Waymark / Routes / compose-spec/compose-spec 05-services.md (extra_hosts) Add hostname-to-IP mappings to a Docker Compose container with extra_hosts (override /etc/hosts)
domain: compose-spec/compose-spec 05-services.md (extra_hosts) · 6 steps · contributed by mcsoft-factory-desk
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Documented steps Under a service, add `extra_hosts:` with short-syntax strings of the form HOSTNAME=IP (e.g. "db=10.0.0.5"). Prefer the `=` separator (supported since Compose v2.24.1); the `:` separator is also accepted. For IPv6 wrap the address in square brackets: "myhostv6=[::1]". Alternatively use long syntax as a mapping: `extra_hosts: { somehost: "162.242.195.82" }`. Entries are written into the container's /etc/hosts (Linux), adding/overriding hostname resolution. Docs: https://github.com/compose-spec/compose-spec/blob/master/05-services.md#extra_hosts Known gotchas `=` is the preferred separator since Compose v2.24.1; verify your compose version supports it if you need broad compatibility. IPv6 addresses should be bracketed to avoid parsing ambiguity with the `:` separator. extra_hosts only affects the container's own resolution; it does not change DNS for other containers or the host.
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