72 lines
3 KiB
Nix
72 lines
3 KiB
Nix
# What every hyperhive service nixos-container sets for itself, imported
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# inside the container's own `config`.
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#
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# The host module that declares `containers.<name>` sets the options below.
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# They restate host-side facts the container cannot read on its own: its
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# evaluation is nested inside `containers.<name>`, and reading the host side
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# back from in here recurses.
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#
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# ⚠️ The container is `Type=notify`: the host's start job lasts until this
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# guest's job queue is empty and ends in a kill at the container's
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# `timeoutStartSec`, one minute unless the host module sets more. A unit in that
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# queue, wanted by `multi-user.target` or required by a unit that is, states a
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# `TimeoutStartSec` below that limit; a fetch that needs longer fails fast,
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# restarts with a growing delay, and starts what depends on it with
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# `systemctl start --no-block` (./swarm-journal-forwarder.nix is the pattern).
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# `module-eval-swarm-services-switch` fails on a unit whose budget, stated or the
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# manager's 90 s default, reaches the limit, unless the unit is listed there with
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# a reason. It also adds the budgets of units ordered one after another by
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# `after`/`before`, and fails when the longest such chain reaches the limit (a
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# unit listed there adds 0 s) or the ordering has a cycle.
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{ config, lib, ... }:
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let
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cfg = config.services.hyperhive.swarmContainer;
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in
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{
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options.services.hyperhive.swarmContainer = {
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privateNetwork = lib.mkOption {
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type = lib.types.bool;
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description = ''
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Must equal the host-side `containers.<name>.privateNetwork`. When
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`false` the container shares the host netns, so its own
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firewall.service would rewrite the HOST ruleset at every boot; the
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container's firewall is turned off and the host firewall owns all
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filtering.
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'';
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};
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writesOwnResolvConf = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = ''
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Something in this container writes `/etc/resolv.conf` itself (the
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`swarm-container-resolver.nix` unit, or a static file), so
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resolvconf is forced off. Left on, host-tracking would regenerate the
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file empty, since the host's copy doesn't cross the boundary after
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start.
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'';
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};
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};
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config = lib.mkMerge [
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{
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# A container that sets its own keeps it. Changing this value changes
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# it for every container that doesn't, and that is a state migration
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# for each of them.
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system.stateVersion = lib.mkDefault "26.05";
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}
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(lib.mkIf (!cfg.privateNetwork) {
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networking.firewall.enable = false;
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})
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# A private-netns container with an interface takes its address from the
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# hive's DHCP. dhcpcd counts an IPv4LL address as an address, so without
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# these `network-online.target` is reached on 169.254.x before the lease.
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(lib.mkIf cfg.privateNetwork {
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networking.dhcpcd.extraConfig = "noipv4ll";
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networking.dhcpcd.wait = "ipv4";
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})
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(lib.mkIf cfg.writesOwnResolvConf {
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networking.resolvconf.enable = lib.mkForce false;
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})
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];
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}
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