tv.consul: init

bin/copy-secrets

@@ -32,6 +32,11 @@ case $(nixos-query services.ejabberd-cd.enable 2>/dev/null) in true)
   ejabberd_uid=$(nixos-query users.extraUsers.ejabberd.uid)
 esac
 
+case $(nixos-query tv.consul.enable 2>/dev/null) in true)
+  consul_secret=$(nixos-query tv.consul.encrypt-file)
+  consul_uid=$(nixos-query users.extraUsers.consul.uid)
+esac
+
 (set -x
   rsync \
     --rsync-path="mkdir -p \"$2\" && rsync" \
@@ -46,6 +51,8 @@ retiolum_secret=${retiolum_secret-}
 retiolum_uid=${retiolum_uid-}
 ejabberd_secret=${ejabberd_secret-}
 ejabberd_uid=${ejabberd_uid-}
+consul_secret=${consul_secret-}
+consul_uid=${consul_uid-}
 
 if test -n "\$retiolum_secret"; then
   chown -v "\$retiolum_uid:0" "\$retiolum_secret"
@@ -55,4 +62,8 @@ if test -n "\$ejabberd_secret"; then
   chown -v "\$ejabberd_uid:0" "\$ejabberd_secret"
 fi
 
+if test -n "\$consul_secret"; then
+  chown -v "\$consul_uid:0" "\$consul_secret"
+fi
+
 EOF

modules/cd/default.nix

@@ -12,6 +12,7 @@ in
       ./users.nix
       ../tv/base.nix
       ../tv/base-cac-CentOS-7-64bit.nix
+      ../tv/config/consul-server.nix
       ../tv/ejabberd.nix # XXX echtes modul
       ../tv/exim-smarthost.nix
       ../tv/git/public.nix

modules/mkdir/default.nix

@@ -12,6 +12,7 @@ in
       ./users.nix
       ../tv/base.nix
       ../tv/base-cac-CentOS-7-64bit.nix
+      ../tv/config/consul-server.nix
       ../tv/exim-smarthost.nix
       ../tv/git/public.nix
       ../tv/sanitize.nix

modules/nomic/default.nix

@@ -9,6 +9,7 @@ in
     ./hardware-configuration.nix
     ./users.nix
     ../tv/base.nix
+    ../tv/config/consul-server.nix
     ../tv/environment.nix
     ../tv/exim-retiolum.nix
     ../tv/git/public.nix

modules/rmdir/default.nix

@@ -12,6 +12,7 @@ in
       ./users.nix
       ../tv/base.nix
       ../tv/base-cac-CentOS-7-64bit.nix
+      ../tv/config/consul-server.nix
       ../tv/exim-smarthost.nix
       ../tv/git/public.nix
       ../tv/sanitize.nix

modules/tv/config/consul-client.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+
+{
+  imports = [ ./consul-server.nix ];
+
+  tv.consul = {
+    server = pkgs.lib.mkForce false;
+  };
+}

modules/tv/config/consul-server.nix

@@ -0,0 +1,22 @@
+{ config, ... }:
+
+{
+  imports = [ ../../tv/consul ];
+  tv.consul = rec {
+    enable = true;
+
+    inherit (config.tv.identity) self;
+    inherit (self) dc;
+
+    server = true;
+
+    hosts = with config.tv.identity.hosts; [
+      # TODO get this list automatically from each host where tv.consul.enable is true
+      cd
+      mkdir
+      nomic
+      rmdir
+      #wu
+    ];
+  };
+}

modules/tv/consul/default.nix

@@ -0,0 +1,123 @@
+{ 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 builtins;
+with lib;
+let
+  service-name = "consul";
+
+  cfg = config.tv.consul;
+
+  out = {
+    imports = [ ../../tv/iptables ];
+    options.tv.consul = api;
+    config = mkIf cfg.enable (mkMerge [
+      imp
+      { tv.iptables.input-retiolum-accept-new-tcp = [ "8300" "8301" ]; }
+      # TODO udp for 8301
+    ]);
+  };
+
+  api = {
+    # TODO inherit (lib) api.options.enable; oder so
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = "enable tv.consul";
+    };
+    dc = mkOption {
+      type = types.unspecified;
+    };
+    hosts = mkOption {
+      type = with types; listOf unspecified;
+    };
+    encrypt-file = mkOption {
+      type = types.str; # TODO path (but not just into store)
+      default = "/etc/consul/encrypt.json";
+    };
+    data-dir = mkOption {
+      type = types.str; # TODO path (but not just into store)
+      default = "/var/lib/consul";
+    };
+    self = mkOption {
+      type = types.unspecified;
+    };
+    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;
+    bind_addr = cfg.self.addr; # TODO cfg.addr
+    enable_syslog = true;
+    retry_join = map (getAttr "addr") (filter (host: host.fqdn != cfg.self.fqdn) 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 consul: ${cfg.data-dir}
+        '';
+        ExecStart = pkgs.writeScript "consul-service" ''
+          #! /bin/sh
+          set -euf
+          exec >/dev/null
+          exec consul agent \
+            -config-file=${toFile "consul.json" (toJSON consul-config)} \
+            -config-file=${cfg.encrypt-file} \
+        '';
+        #-node=${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 = 2983239726; # genid consul
+  };
+
+in
+out

modules/wu/default.nix

@@ -8,6 +8,7 @@ in
   imports = [
     ./hosts.nix
     ../tv/base.nix
+    ../tv/config/consul-client.nix
     ../tv/exim-retiolum.nix
     ../tv/environment.nix
     ../tv/sanitize.nix