521 lines
18 KiB
Nix
521 lines
18 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.mysql;
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isMariaDB = lib.getName cfg.package == lib.getName pkgs.mariadb;
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mysqldOptions =
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"--user=${cfg.user} --datadir=${cfg.dataDir} --basedir=${cfg.package}";
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format = pkgs.formats.ini { listsAsDuplicateKeys = true; };
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configFile = format.generate "my.cnf" cfg.settings;
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in
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{
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imports = [
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(mkRemovedOptionModule [ "services" "mysql" "pidDir" ] "Don't wait for pidfiles, describe dependencies through systemd.")
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(mkRemovedOptionModule [ "services" "mysql" "rootPassword" ] "Use socket authentication or set the password outside of the nix store.")
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(mkRemovedOptionModule [ "services" "mysql" "extraOptions" ] "Use services.mysql.settings.mysqld instead.")
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(mkRemovedOptionModule [ "services" "mysql" "bind" ] "Use services.mysql.settings.mysqld.bind-address instead.")
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(mkRemovedOptionModule [ "services" "mysql" "port" ] "Use services.mysql.settings.mysqld.port instead.")
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];
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###### interface
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options = {
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services.mysql = {
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enable = mkEnableOption "MySQL server";
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package = mkOption {
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type = types.package;
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example = literalExpression "pkgs.mariadb";
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description = lib.mdDoc ''
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Which MySQL derivation to use. MariaDB packages are supported too.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "mysql";
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description = ''
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User account under which MySQL runs.
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<note><para>
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If left as the default value this user will automatically be created
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on system activation, otherwise you are responsible for
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ensuring the user exists before the MySQL service starts.
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</para></note>
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'';
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};
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group = mkOption {
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type = types.str;
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default = "mysql";
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description = ''
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Group account under which MySQL runs.
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<note><para>
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If left as the default value this group will automatically be created
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on system activation, otherwise you are responsible for
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ensuring the user exists before the MySQL service starts.
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</para></note>
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'';
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};
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dataDir = mkOption {
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type = types.path;
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example = "/var/lib/mysql";
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description = ''
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The data directory for MySQL.
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<note><para>
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If left as the default value of <literal>/var/lib/mysql</literal> this directory will automatically be created before the MySQL
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server starts, otherwise you are responsible for ensuring the directory exists with appropriate ownership and permissions.
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</para></note>
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'';
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};
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configFile = mkOption {
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type = types.path;
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default = configFile;
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defaultText = ''
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A configuration file automatically generated by NixOS.
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'';
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description = lib.mdDoc ''
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Override the configuration file used by MySQL. By default,
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NixOS generates one automatically from {option}`services.mysql.settings`.
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'';
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example = literalExpression ''
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pkgs.writeText "my.cnf" '''
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[mysqld]
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datadir = /var/lib/mysql
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bind-address = 127.0.0.1
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port = 3336
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!includedir /etc/mysql/conf.d/
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''';
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'';
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};
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settings = mkOption {
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type = format.type;
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default = {};
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description = ''
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MySQL configuration. Refer to
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<link xlink:href="https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html"/>,
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<link xlink:href="https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html"/>,
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and <link xlink:href="https://mariadb.com/kb/en/server-system-variables/"/>
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for details on supported values.
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<note>
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<para>
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MySQL configuration options such as <literal>--quick</literal> should be treated as
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boolean options and provided values such as <literal>true</literal>, <literal>false</literal>,
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<literal>1</literal>, or <literal>0</literal>. See the provided example below.
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</para>
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</note>
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'';
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example = literalExpression ''
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{
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mysqld = {
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key_buffer_size = "6G";
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table_cache = 1600;
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log-error = "/var/log/mysql_err.log";
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plugin-load-add = [ "server_audit" "ed25519=auth_ed25519" ];
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};
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mysqldump = {
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quick = true;
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max_allowed_packet = "16M";
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};
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}
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'';
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};
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initialDatabases = mkOption {
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type = types.listOf (types.submodule {
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options = {
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name = mkOption {
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type = types.str;
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description = lib.mdDoc ''
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The name of the database to create.
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'';
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};
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schema = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = lib.mdDoc ''
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The initial schema of the database; if null (the default),
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an empty database is created.
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'';
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};
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};
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});
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default = [];
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description = lib.mdDoc ''
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List of database names and their initial schemas that should be used to create databases on the first startup
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of MySQL. The schema attribute is optional: If not specified, an empty database is created.
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'';
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example = [
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{ name = "foodatabase"; schema = literalExpression "./foodatabase.sql"; }
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{ name = "bardatabase"; }
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];
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};
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initialScript = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = lib.mdDoc "A file containing SQL statements to be executed on the first startup. Can be used for granting certain permissions on the database.";
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};
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ensureDatabases = mkOption {
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type = types.listOf types.str;
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default = [];
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description = lib.mdDoc ''
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Ensures that the specified databases exist.
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This option will never delete existing databases, especially not when the value of this
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option is changed. This means that databases created once through this option or
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otherwise have to be removed manually.
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'';
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example = [
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"nextcloud"
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"matomo"
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];
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};
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ensureUsers = mkOption {
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type = types.listOf (types.submodule {
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options = {
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name = mkOption {
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type = types.str;
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description = lib.mdDoc ''
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Name of the user to ensure.
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'';
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};
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ensurePermissions = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = lib.mdDoc ''
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Permissions to ensure for the user, specified as attribute set.
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The attribute names specify the database and tables to grant the permissions for,
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separated by a dot. You may use wildcards here.
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The attribute values specfiy the permissions to grant.
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You may specify one or multiple comma-separated SQL privileges here.
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For more information on how to specify the target
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and on which privileges exist, see the
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[GRANT syntax](https://mariadb.com/kb/en/library/grant/).
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The attributes are used as `GRANT ''${attrName} ON ''${attrValue}`.
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'';
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example = literalExpression ''
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{
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"database.*" = "ALL PRIVILEGES";
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"*.*" = "SELECT, LOCK TABLES";
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}
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'';
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};
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};
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});
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default = [];
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description = lib.mdDoc ''
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Ensures that the specified users exist and have at least the ensured permissions.
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The MySQL users will be identified using Unix socket authentication. This authenticates the Unix user with the
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same name only, and that without the need for a password.
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This option will never delete existing users or remove permissions, especially not when the value of this
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option is changed. This means that users created and permissions assigned once through this option or
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otherwise have to be removed manually.
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'';
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example = literalExpression ''
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[
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{
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name = "nextcloud";
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ensurePermissions = {
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"nextcloud.*" = "ALL PRIVILEGES";
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};
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}
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{
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name = "backup";
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ensurePermissions = {
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"*.*" = "SELECT, LOCK TABLES";
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};
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}
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]
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'';
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};
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replication = {
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role = mkOption {
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type = types.enum [ "master" "slave" "none" ];
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default = "none";
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description = lib.mdDoc "Role of the MySQL server instance.";
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};
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serverId = mkOption {
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type = types.int;
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default = 1;
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description = lib.mdDoc "Id of the MySQL server instance. This number must be unique for each instance.";
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};
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masterHost = mkOption {
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type = types.str;
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description = lib.mdDoc "Hostname of the MySQL master server.";
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};
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slaveHost = mkOption {
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type = types.str;
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description = lib.mdDoc "Hostname of the MySQL slave server.";
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};
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masterUser = mkOption {
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type = types.str;
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description = lib.mdDoc "Username of the MySQL replication user.";
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};
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masterPassword = mkOption {
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type = types.str;
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description = lib.mdDoc "Password of the MySQL replication user.";
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};
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masterPort = mkOption {
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type = types.port;
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default = 3306;
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description = lib.mdDoc "Port number on which the MySQL master server runs.";
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};
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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services.mysql.dataDir =
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mkDefault (if versionAtLeast config.system.stateVersion "17.09" then "/var/lib/mysql"
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else "/var/mysql");
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services.mysql.settings.mysqld = mkMerge [
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{
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datadir = cfg.dataDir;
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port = mkDefault 3306;
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}
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(mkIf (cfg.replication.role == "master" || cfg.replication.role == "slave") {
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log-bin = "mysql-bin-${toString cfg.replication.serverId}";
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log-bin-index = "mysql-bin-${toString cfg.replication.serverId}.index";
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relay-log = "mysql-relay-bin";
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server-id = cfg.replication.serverId;
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binlog-ignore-db = [ "information_schema" "performance_schema" "mysql" ];
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})
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(mkIf (!isMariaDB) {
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plugin-load-add = "auth_socket.so";
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})
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];
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users.users = optionalAttrs (cfg.user == "mysql") {
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mysql = {
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description = "MySQL server user";
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group = cfg.group;
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uid = config.ids.uids.mysql;
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};
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};
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users.groups = optionalAttrs (cfg.group == "mysql") {
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mysql.gid = config.ids.gids.mysql;
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};
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environment.systemPackages = [ cfg.package ];
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environment.etc."my.cnf".source = cfg.configFile;
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systemd.services.mysql = {
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description = "MySQL Server";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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restartTriggers = [ cfg.configFile ];
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unitConfig.RequiresMountsFor = cfg.dataDir;
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path = [
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# Needed for the mysql_install_db command in the preStart script
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# which calls the hostname command.
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pkgs.nettools
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];
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preStart = if isMariaDB then ''
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if ! test -e ${cfg.dataDir}/mysql; then
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${cfg.package}/bin/mysql_install_db --defaults-file=/etc/my.cnf ${mysqldOptions}
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touch ${cfg.dataDir}/mysql_init
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fi
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'' else ''
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if ! test -e ${cfg.dataDir}/mysql; then
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${cfg.package}/bin/mysqld --defaults-file=/etc/my.cnf ${mysqldOptions} --initialize-insecure
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touch ${cfg.dataDir}/mysql_init
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fi
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'';
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script = ''
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# https://mariadb.com/kb/en/getting-started-with-mariadb-galera-cluster/#systemd-and-galera-recovery
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if test -n "''${_WSREP_START_POSITION}"; then
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if test -e "${cfg.package}/bin/galera_recovery"; then
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VAR=$(cd ${cfg.package}/bin/..; ${cfg.package}/bin/galera_recovery); [[ $? -eq 0 ]] && export _WSREP_START_POSITION=$VAR || exit 1
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fi
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fi
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# The last two environment variables are used for starting Galera clusters
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exec ${cfg.package}/bin/mysqld --defaults-file=/etc/my.cnf ${mysqldOptions} $_WSREP_NEW_CLUSTER $_WSREP_START_POSITION
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'';
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postStart = let
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# The super user account to use on *first* run of MySQL server
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superUser = if isMariaDB then cfg.user else "root";
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in ''
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${optionalString (!isMariaDB) ''
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# Wait until the MySQL server is available for use
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count=0
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while [ ! -e /run/mysqld/mysqld.sock ]
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do
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if [ $count -eq 30 ]
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then
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echo "Tried 30 times, giving up..."
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exit 1
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fi
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echo "MySQL daemon not yet started. Waiting for 1 second..."
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count=$((count++))
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sleep 1
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done
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''}
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if [ -f ${cfg.dataDir}/mysql_init ]
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then
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# While MariaDB comes with a 'mysql' super user account since 10.4.x, MySQL does not
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# Since we don't want to run this service as 'root' we need to ensure the account exists on first run
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( echo "CREATE USER IF NOT EXISTS '${cfg.user}'@'localhost' IDENTIFIED WITH ${if isMariaDB then "unix_socket" else "auth_socket"};"
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echo "GRANT ALL PRIVILEGES ON *.* TO '${cfg.user}'@'localhost' WITH GRANT OPTION;"
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) | ${cfg.package}/bin/mysql -u ${superUser} -N
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${concatMapStrings (database: ''
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# Create initial databases
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if ! test -e "${cfg.dataDir}/${database.name}"; then
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echo "Creating initial database: ${database.name}"
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( echo 'create database `${database.name}`;'
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${optionalString (database.schema != null) ''
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echo 'use `${database.name}`;'
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# TODO: this silently falls through if database.schema does not exist,
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# we should catch this somehow and exit, but can't do it here because we're in a subshell.
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if [ -f "${database.schema}" ]
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then
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cat ${database.schema}
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elif [ -d "${database.schema}" ]
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then
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cat ${database.schema}/mysql-databases/*.sql
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fi
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''}
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) | ${cfg.package}/bin/mysql -u ${superUser} -N
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fi
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'') cfg.initialDatabases}
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${optionalString (cfg.replication.role == "master")
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''
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# Set up the replication master
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( echo "use mysql;"
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echo "CREATE USER '${cfg.replication.masterUser}'@'${cfg.replication.slaveHost}' IDENTIFIED WITH mysql_native_password;"
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echo "SET PASSWORD FOR '${cfg.replication.masterUser}'@'${cfg.replication.slaveHost}' = PASSWORD('${cfg.replication.masterPassword}');"
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echo "GRANT REPLICATION SLAVE ON *.* TO '${cfg.replication.masterUser}'@'${cfg.replication.slaveHost}';"
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) | ${cfg.package}/bin/mysql -u ${superUser} -N
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''}
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${optionalString (cfg.replication.role == "slave")
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''
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# Set up the replication slave
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( echo "stop slave;"
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echo "change master to master_host='${cfg.replication.masterHost}', master_user='${cfg.replication.masterUser}', master_password='${cfg.replication.masterPassword}';"
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echo "start slave;"
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) | ${cfg.package}/bin/mysql -u ${superUser} -N
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''}
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${optionalString (cfg.initialScript != null)
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''
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# Execute initial script
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# using toString to avoid copying the file to nix store if given as path instead of string,
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# as it might contain credentials
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cat ${toString cfg.initialScript} | ${cfg.package}/bin/mysql -u ${superUser} -N
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''}
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rm ${cfg.dataDir}/mysql_init
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fi
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${optionalString (cfg.ensureDatabases != []) ''
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(
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${concatMapStrings (database: ''
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echo "CREATE DATABASE IF NOT EXISTS \`${database}\`;"
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'') cfg.ensureDatabases}
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) | ${cfg.package}/bin/mysql -N
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''}
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${concatMapStrings (user:
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''
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( echo "CREATE USER IF NOT EXISTS '${user.name}'@'localhost' IDENTIFIED WITH ${if isMariaDB then "unix_socket" else "auth_socket"};"
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${concatStringsSep "\n" (mapAttrsToList (database: permission: ''
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echo "GRANT ${permission} ON ${database} TO '${user.name}'@'localhost';"
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'') user.ensurePermissions)}
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) | ${cfg.package}/bin/mysql -N
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'') cfg.ensureUsers}
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'';
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serviceConfig = mkMerge [
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{
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Type = if isMariaDB then "notify" else "simple";
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Restart = "on-abort";
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RestartSec = "5s";
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# User and group
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User = cfg.user;
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Group = cfg.group;
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# Runtime directory and mode
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RuntimeDirectory = "mysqld";
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RuntimeDirectoryMode = "0755";
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# Access write directories
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ReadWritePaths = [ cfg.dataDir ];
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# Capabilities
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CapabilityBoundingSet = "";
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# Security
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NoNewPrivileges = true;
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# Sandboxing
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ProtectSystem = "strict";
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ProtectHome = true;
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PrivateTmp = true;
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PrivateDevices = true;
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ProtectHostname = true;
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ProtectKernelTunables = true;
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ProtectKernelModules = true;
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ProtectControlGroups = true;
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RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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PrivateMounts = true;
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# System Call Filtering
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SystemCallArchitectures = "native";
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}
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(mkIf (cfg.dataDir == "/var/lib/mysql") {
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StateDirectory = "mysql";
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StateDirectoryMode = "0700";
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})
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];
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};
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};
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}
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