167 lines
4.3 KiB
Nix
167 lines
4.3 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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with lib;
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let
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dataDir = "/var/lib/consul";
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cfg = config.services.consul;
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configOptions = {
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data_dir = dataDir;
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rejoin_after_leave = true;
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}
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// (if cfg.webUi then { ui_dir = "${pkgs.consul.ui}"; } else { })
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// cfg.extraConfig;
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configFiles = [ "/etc/consul.json" "/etc/consul-addrs.json" ]
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++ cfg.extraConfigFiles;
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devices = attrValues (filterAttrs (_: i: i != null) cfg.interface);
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systemdDevices = flip map devices
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(i: "sys-subsystem-net-devices-${utils.escapeSystemdPath i}.device");
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in
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{
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options = {
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services.consul = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enables the consul daemon.
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'';
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};
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webUi = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enables the web interface on the consul http port.
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'';
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};
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interface = {
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advertise = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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The name of the interface to pull the advertise_addr from.
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'';
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};
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bind = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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The name of the interface to pull the bind_addr from.
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'';
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};
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};
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forceIpv4 = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether we should force the interfaces to only pull ipv4 addresses.
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'';
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};
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dropPrivileges = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether the consul agent should be run as a non-root consul user.
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'';
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};
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extraConfig = mkOption {
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default = { };
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description = ''
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Extra configuration options which are serialized to json and added
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to the config.json file.
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'';
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};
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extraConfigFiles = mkOption {
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default = [ ];
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type = types.listOf types.str;
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description = ''
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Additional configuration files to pass to consul
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NOTE: These will not trigger the service to be restarted when altered.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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users.extraUsers."consul" = {
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description = "Consul agent daemon user";
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uid = config.ids.uids.consul;
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};
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environment = {
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etc."consul.json".text = builtins.toJSON configOptions;
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systemPackages = with pkgs; [ consul ];
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};
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systemd.services.consul = {
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ] ++ systemdDevices;
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bindsTo = systemdDevices;
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restartTriggers = [ config.environment.etc."consul.json".source ];
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serviceConfig = {
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ExecStart = "@${pkgs.consul}/bin/consul consul agent"
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+ concatMapStrings (n: " -config-file ${n}") configFiles;
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ExecStop = "${pkgs.consul}/bin/consul leave";
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ExecReload = "${pkgs.consul}/bin/consul reload";
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PermissionsStartOnly = true;
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User = if cfg.dropPrivileges then "consul" else null;
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};
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path = with pkgs; [ iproute gnugrep gawk ];
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preStart = ''
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mkdir -m 0700 -p ${dataDir}
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chown -R consul ${dataDir}
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# Determine interface addresses
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getAddrOnce () {
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ip addr show dev "$1" \
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| grep 'inet${optionalString (cfg.forceIpv4) " "}.*scope global' \
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| awk -F '[ /\t]*' '{print $3}' | head -n 1
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}
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getAddr () {
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ADDR="$(getAddrOnce $1)"
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LEFT=60 # Die after 1 minute
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while [ -z "$ADDR" ]; do
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sleep 1
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LEFT=$(expr $LEFT - 1)
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if [ "$LEFT" -eq "0" ]; then
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echo "Address lookup timed out"
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exit 1
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fi
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ADDR="$(getAddrOnce $1)"
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done
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echo "$ADDR"
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}
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echo "{" > /etc/consul-addrs.json
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''
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+ concatStrings (flip mapAttrsToList cfg.interface (name: i:
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optionalString (i != null) ''
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echo " \"${name}_addr\": \"$(getAddr "${i}")\"," >> /etc/consul-addrs.json
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''))
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+ ''
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echo " \"\": \"\"" >> /etc/consul-addrs.json
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echo "}" >> /etc/consul-addrs.json
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'';
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};
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};
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}
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