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PJ Eby 2018-12-29 00:53:56 -05:00
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## A Fully-Isolated Poste.io Image
[poste.io](https://poste.io) is a pretty cool email server implementation for docker. Unfortunately, it doesn't play well with other mail servers on the same machine, which makes it hard to e.g., have both a development and production instance.
[poste.io](https://poste.io) is a pretty cool email server implementation for docker. Unfortunately, when used with host-mode networking (the poste.io recommended configuration) it doesn't play well with other mail servers on the same machine. (Which makes it hard to e.g., have both a development and production instance.)
Specifically, poste.io *requires* docker host mode networking, but then binds its outward-facing services to *every* IP address of the machine, *and* binds several of its internal services to localhost ports (24, 6379, 11332-11334, 11380, and 13001), which can conflict with things besides mail servers or other poste.io instances.
Specifically, in host mode networking, poste.io binds its outward-facing services to *every* IP address of the machine, *and* binds several of its internal services to localhost ports (24, 6379, 11332-11334, 11380, and 13001), which can conflict with things besides mail servers or other poste.io instances.
As a result, poste.io not only doesn't play well with other mail servers, it doesn't play well with being used on a server that *does anything else*. (It almost might as well not be a docker container at all!)
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Unfortunately, poste's admin tool isn't written with unix sockets in mind, and neither are significant parts of haraka and its plugins. Thus, in addition to adding the configuration files found under [files/](files/), this image also has to [patch a lot of files](files/patches). (Most of the patching is done at image build time, but a few are tweaked at container start by a patched version of `/etc/cont-init.d/23-nginx.sh`, because nginx and haraka don't allow variable substitution in the part of their config files that set listening ports.)
(Note: this image relies even more on a correct docker hostname than poste.io does. Make sure that the hostname you assign to the container is public, fully-qualified, and maps to exactly one IPv4 address.)
(Note: this image relies even more on a correct docker hostname than poste.io does. Make sure that the hostname you assign to the container is public, fully-qualified, and maps to exactly one IPv4 address. You also need to be using host-mode networking, since in any other mode this image isn't needed.)
To use this image, just replace `analogic/poste.io` in your config with `dirtsimple/poste.io`.