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-rw-r--r--tv/3modules/consul.nix118
1 files changed, 118 insertions, 0 deletions
diff --git a/tv/3modules/consul.nix b/tv/3modules/consul.nix
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+{ config, lib, pkgs, ... }:
+
+# if quorum gets lost, then start any node with a config that doesn't contain bootstrap_expect
+# but -bootstrap
+# TODO consul-bootstrap HOST that actually does is
+# TODO tools to inspect state of a cluster in outage state
+
+with import ../4lib { inherit lib pkgs; };
+let
+ cfg = config.tv.consul;
+
+ out = {
+ options.tv.consul = api;
+ config = mkIf cfg.enable (mkMerge [
+ imp
+ { tv.iptables.input-retiolum-accept-new-tcp = [ "8300" "8301" ]; }
+ # TODO udp for 8301
+ ]);
+ };
+
+ api = {
+ enable = mkEnableOption "tv.consul";
+
+ dc = mkOption {
+ type = types.label;
+ };
+ hosts = mkOption {
+ type = with types; listOf host;
+ };
+ encrypt-file = mkOption {
+ type = types.str; # TODO path (but not just into store)
+ default = "/root/src/secrets/consul-encrypt.json";
+ };
+ data-dir = mkOption {
+ type = types.str; # TODO path (but not just into store)
+ default = "/var/lib/consul";
+ };
+ self = mkOption {
+ type = types.host;
+ };
+ server = mkOption {
+ type = types.bool;
+ default = false;
+ };
+ GOMAXPROCS = mkOption {
+ type = types.int;
+ default = cfg.self.cores;
+ };
+ };
+
+ consul-config = {
+ datacenter = cfg.dc;
+ data_dir = cfg.data-dir;
+ log_level = "INFO";
+ #node_name =
+ server = cfg.server;
+ enable_syslog = true;
+ retry_join =
+ # TODO allow consul in other nets than retiolum [maybe]
+ concatMap (host: host.nets.retiolum.addrs)
+ (filter (host: host.name != cfg.self.name) cfg.hosts);
+ leave_on_terminate = true;
+ } // optionalAttrs cfg.server {
+ bootstrap_expect = length cfg.hosts;
+ leave_on_terminate = false;
+ };
+
+ imp = {
+ environment.systemPackages = with pkgs; [
+ consul
+ ];
+
+ systemd.services.consul = {
+ after = [ "network.target" ];
+ wantedBy = [ "multi-user.target" ];
+ path = with pkgs; [
+ consul
+ ];
+ environment = {
+ GOMAXPROCS = toString cfg.GOMAXPROCS;
+ };
+ serviceConfig = {
+ PermissionsStartOnly = "true";
+ SyslogIdentifier = "consul";
+ User = user.name;
+ PrivateTmp = "true";
+ Restart = "always";
+ ExecStartPre = pkgs.writeScript "consul-init" ''
+ #! /bin/sh
+ mkdir -p ${cfg.data-dir}
+ chown ${user.name}: ${cfg.data-dir}
+ install -o ${user.name} -m 0400 ${cfg.encrypt-file} /tmp/encrypt.json
+ '';
+ ExecStart = pkgs.writeScript "consul-service" ''
+ #! /bin/sh
+ set -euf
+ exec >/dev/null
+ exec consul agent \
+ -config-file=${toFile "consul.json" (toJSON consul-config)} \
+ -config-file=/tmp/encrypt.json
+ '';
+ #-node=${cfg.self.fqdn} \
+ #ExecStart = "${tinc}/sbin/tincd -c ${confDir} -d 0 -U ${user} -D";
+ };
+ };
+
+ users.extraUsers = singleton {
+ inherit (user) name uid;
+ };
+ };
+
+ user = {
+ name = "consul";
+ uid = 2999951406; # genid consul
+ };
+
+in
+out