nixos: add grafana module

nixos/modules/misc/ids.nix

@@ -217,6 +217,7 @@
       asterisk = 192;
       plex = 193;
       bird = 195;
+      grafana = 196;
 
       # When adding a uid, make sure it doesn't match an existing gid. And don't use uids above 399!
 
@@ -412,6 +413,7 @@
       plex = 193;
       sabnzbd = 194;
       bird = 195;
+      #grafana = 196; #unused
 
       # When adding a gid, make sure it doesn't match an existing
       # uid. Users and groups with the same name should have equal

nixos/modules/module-list.nix

@@ -225,6 +225,7 @@
   ./services/monitoring/collectd.nix
   ./services/monitoring/das_watchdog.nix
   ./services/monitoring/dd-agent.nix
+  ./services/monitoring/grafana.nix
   ./services/monitoring/graphite.nix
   ./services/monitoring/monit.nix
   ./services/monitoring/munin.nix

nixos/modules/services/monitoring/grafana.nix

@@ -0,0 +1,335 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.grafana;
+
+  b2s = val: if val then "true" else "false";
+
+  cfgFile = pkgs.writeText "grafana.ini" ''
+    app_name = grafana
+    app_mode = production
+
+    [server]
+    ; protocol (http or https)
+    protocol = ${cfg.protocol}
+    ; the ip address to bind to, empty will bind to all interfaces
+    http_addr = ${cfg.addr}
+    ; the http port  to use
+    http_port = ${toString cfg.port}
+    ; The public facing domain name used to access grafana from a browser
+    domain = ${cfg.domain}
+    ; the full public facing url
+    root_url = ${cfg.rootUrl}
+    router_logging = false
+    ; the path relative to the binary where the static (html/js/css) files are placed
+    static_root_path = ${cfg.staticRootPath}
+    ; enable gzip
+    enable_gzip = false
+    ; https certs & key file
+    cert_file = ${cfg.certFile}
+    cert_key = ${cfg.certKey}
+
+    [analytics]
+    # Server reporting, sends usage counters to stats.grafana.org every 24 hours.
+    # No ip addresses are being tracked, only simple counters to track
+    # running instances, dashboard and error counts. It is very helpful to us.
+    # Change this option to false to disable reporting.
+    reporting_enabled = true
+    ; Google Analytics universal tracking code, only enabled if you specify an id here
+    google_analytics_ua_id =
+
+    [database]
+    ; Either "mysql", "postgres" or "sqlite3", it's your choice
+    type = ${cfg.database.type}
+    host = ${cfg.database.host}
+    name = ${cfg.database.name}
+    user = ${cfg.database.user}
+    password = ${cfg.database.password}
+    ; For "postgres" only, either "disable", "require" or "verify-full"
+    ssl_mode = disable
+    ; For "sqlite3" only
+    path = ${cfg.database.path}
+
+    [session]
+    ; Either "memory", "file", "redis", "mysql", default is "memory"
+    provider = file
+    ; Provider config options
+    ; memory: not have any config yet
+    ; file: session file path, e.g. `data/sessions`
+    ; redis: config like redis server addr, poolSize, password, e.g. `127.0.0.1:6379,100,grafana`
+    ; mysql: go-sql-driver/mysql dsn config string, e.g. `user:password@tcp(127.0.0.1)/database_name`
+    provider_config = data/sessions
+    ; Session cookie name
+    cookie_name = grafana_sess
+    ; If you use session in https only, default is false
+    cookie_secure = false
+    ; Session life time, default is 86400
+    session_life_time = 86400
+    ; session id hash func, Either "sha1", "sha256" or "md5" default is sha1
+    session_id_hashfunc = sha1
+    ; Session hash key, default is use random string
+    session_id_hashkey =
+
+    [security]
+    ; default admin user, created on startup
+    admin_user = ${cfg.security.adminUser}
+    ; default admin password, can be changed before first start of grafana,  or in profile settings
+    admin_password = ${cfg.security.adminPassword}
+    ; used for signing
+    secret_key = ${cfg.security.secretKey}
+    ; Auto-login remember days
+    login_remember_days = 7
+    cookie_username = grafana_user
+    cookie_remember_name = grafana_remember
+
+    [users]
+    ; disable user signup / registration
+    allow_sign_up = ${b2s cfg.users.allowSignUp}
+    ; Allow non admin users to create organizations
+    allow_org_create = ${b2s cfg.users.allowOrgCreate}
+    # Set to true to automatically assign new users to the default organization (id 1)
+    auto_assign_org = ${b2s cfg.users.autoAssignOrg}
+    ; Default role new users will be automatically assigned (if disabled above is set to true)
+    auto_assign_org_role = ${cfg.users.autoAssignOrgRole}
+
+    [auth.anonymous]
+    ; enable anonymous access
+    enabled = ${b2s cfg.auth.anonymous.enable}
+    ; specify organization name that should be used for unauthenticated users
+    org_name = Main Org.
+    ; specify role for unauthenticated users
+    org_role = Viewer
+
+    [auth.github]
+    enabled = false
+    client_id = some_id
+    client_secret = some_secret
+    scopes = user:email
+    auth_url = https://github.com/login/oauth/authorize
+    token_url = https://github.com/login/oauth/access_token
+
+    [auth.google]
+    enabled = false
+    client_id = some_client_id
+    client_secret = some_client_secret
+    scopes = https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email
+    auth_url = https://accounts.google.com/o/oauth2/auth
+    token_url = https://accounts.google.com/o/oauth2/token
+
+    [log]
+    root_path = data/log
+    ; Either "console", "file", default is "console"
+    ; Use comma to separate multiple modes, e.g. "console, file"
+    mode = console
+    ; Buffer length of channel, keep it as it is if you don't know what it is.
+    buffer_len = 10000
+    ; Either "Trace", "Debug", "Info", "Warn", "Error", "Critical", default is "Trace"
+    level = Info
+
+    ; For "console" mode only
+    [log.console]
+    level =
+
+    ; For "file" mode only
+    [log.file]
+    level =
+    ; This enables automated log rotate(switch of following options), default is true
+    log_rotate = true
+    ; Max line number of single file, default is 1000000
+    max_lines = 1000000
+    ; Max size shift of single file, default is 28 means 1 << 28, 256MB
+    max_lines_shift = 28
+    ; Segment log daily, default is true
+    daily_rotate = true
+    ; Expired days of log file(delete after max days), default is 7
+    max_days = 7
+
+    [event_publisher]
+    enabled = false
+    rabbitmq_url = amqp://localhost/
+    exchange = grafana_events
+  '';
+
+in {
+  options.services.grafana = {
+    enable = mkEnableOption "Whether to enable grafana.";
+
+    protocol = mkOption {
+      description = "Which protocol to listen.";
+      default = "http";
+      type = types.enum ["http" "https"];
+    };
+
+    addr = mkOption {
+      description = "Listening address.";
+      default = "127.0.0.1";
+      type = types.str;
+    };
+
+    port = mkOption {
+      description = "Listening port.";
+      default = 3000;
+      type = types.int;
+    };
+
+    domain = mkOption {
+      description = "The public facing domain name used to access grafana from a browser.";
+      default = "localhost";
+      type = types.str;
+    };
+
+    rootUrl = mkOption {
+      description = "Full public facing url.";
+      default = "%(protocol)s://%(domain)s:%(http_port)s/";
+      type = types.str;
+    };
+
+    certFile = mkOption {
+      description = "Cert file for ssl.";
+      default = "";
+      type = types.str;
+    };
+
+    certKey = mkOption {
+      description = "Cert key for ssl.";
+      default = "";
+      type = types.str;
+    };
+
+    staticRootPath = mkOption {
+      description = "Root path for static assets.";
+      default = "${cfg.package}/share/go/src/github.com/grafana/grafana/public";
+      type = types.str;
+    };
+
+    package = mkOption {
+      description = "Package to use.";
+      default = pkgs.goPackages.grafana;
+      type = types.package;
+    };
+
+    dataDir = mkOption {
+      description = "Data directory.";
+      default = "/var/lib/grafana";
+      type = types.path;
+    };
+
+    database = {
+      type = mkOption {
+        description = "Database type.";
+        default = "sqlite3";
+        type = types.enum ["mysql" "sqlite3" "postgresql"];
+      };
+
+      host = mkOption {
+        description = "Database host.";
+        default = "127.0.0.1:3306";
+        type = types.str;
+      };
+
+      name = mkOption {
+        description = "Database name.";
+        default = "grafana";
+        type = types.str;
+      };
+
+      user = mkOption {
+        description = "Database user.";
+        default = "root";
+        type = types.str;
+      };
+
+      password = mkOption {
+        description = "Database password.";
+        default = "";
+        type = types.str;
+      };
+
+      path = mkOption {
+        description = "Database path.";
+        default = "${cfg.dataDir}/data/grafana.db";
+        type = types.path;
+      };
+    };
+
+    security = {
+      adminUser = mkOption {
+        description = "Default admin username.";
+        default = "admin";
+        type = types.str;
+      };
+
+      adminPassword = mkOption {
+        description = "Default admin password.";
+        default = "admin";
+        type = types.str;
+      };
+
+      secretKey = mkOption {
+        description = "Secret key used for signing.";
+        default = "SW2YcwTIb9zpOOhoPsMm";
+        type = types.str;
+      };
+    };
+
+    users = {
+      allowSignUp = mkOption {
+        description = "Disable user signup / registration";
+        default = false;
+        type = types.bool;
+      };
+
+      allowOrgCreate = mkOption {
+        description = "Whether user is allowed to create organizations.";
+        default = false;
+        type = types.bool;
+      };
+
+      autoAssignOrg = mkOption {
+        description = "Whether to automatically assign new users to default org.";
+        default = true;
+        type = types.bool;
+      };
+
+      autoAssignOrgRole = mkOption {
+        description = "Default role new users will be auto assigned.";
+        default = "Viewer";
+        type = types.enum ["Viewer" "Editor"];
+      };
+    };
+
+    auth.anonymous = {
+      enable = mkOption {
+        description = "Whether to allow anonymous access";
+        default = false;
+        type = types.bool;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    warnings = [
+      "Grafana passwords will be stored as plaintext in nix store!"
+    ];
+
+    systemd.services.grafana = {
+      description = "Grafana Service Daemon";
+      wantedBy = ["multi-user.target"];
+      after = ["networking.target"];
+      serviceConfig = {
+        ExecStart = "${cfg.package}/bin/grafana --config ${cfgFile} web";
+        WorkingDirectory = cfg.dataDir;
+        User = "grafana";
+      };
+    };
+
+    users.extraUsers.grafana = {
+      uid = config.ids.uids.grafana;
+      description = "Grafana user";
+      home = cfg.dataDir;
+      createHome = true;
+    };
+  };
+}