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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.mysql;
isMariaDB = lib.getName cfg.package == lib.getName pkgs.mariadb;
mysqldOptions =
"--user=${cfg.user} --datadir=${cfg.dataDir} --basedir=${cfg.package}";
format = pkgs.formats.ini { listsAsDuplicateKeys = true; };
configFile = format.generate "my.cnf" cfg.settings;
in
{
imports = [
(mkRemovedOptionModule [ "services" "mysql" "pidDir" ] "Don't wait for pidfiles, describe dependencies through systemd.")
(mkRemovedOptionModule [ "services" "mysql" "rootPassword" ] "Use socket authentication or set the password outside of the nix store.")
(mkRemovedOptionModule [ "services" "mysql" "extraOptions" ] "Use services.mysql.settings.mysqld instead.")
];
###### interface
options = {
services.mysql = {
enable = mkEnableOption "MySQL server";
package = mkOption {
type = types.package;
example = literalExpression "pkgs.mariadb";
description = "
Which MySQL derivation to use. MariaDB packages are supported too.
";
};
bind = mkOption {
type = types.nullOr types.str;
default = null;
example = "0.0.0.0";
description = "Address to bind to. The default is to bind to all addresses.";
};
port = mkOption {
type = types.port;
default = 3306;
description = "Port of MySQL.";
};
user = mkOption {
type = types.str;
default = "mysql";
description = ''
User account under which MySQL runs.
<note><para>
If left as the default value this user will automatically be created
on system activation, otherwise you are responsible for
ensuring the user exists before the MySQL service starts.
</para></note>
'';
};
group = mkOption {
type = types.str;
default = "mysql";
description = ''
Group account under which MySQL runs.
<note><para>
If left as the default value this user will automatically be created
on system activation, otherwise you are responsible for
ensuring the user exists before the MySQL service starts.
</para></note>
'';
};
dataDir = mkOption {
type = types.path;
example = "/var/lib/mysql";
description = ''
The data directory for MySQL.
<note><para>
If left as the default value of <literal>/var/lib/mysql</literal> this directory will automatically be created before the MySQL
server starts, otherwise you are responsible for ensuring the directory exists with appropriate ownership and permissions.
</para></note>
'';
};
configFile = mkOption {
type = types.path;
default = configFile;
defaultText = ''
A configuration file automatically generated by NixOS.
'';
description = ''
Override the configuration file used by MySQL. By default,
NixOS generates one automatically from <option>services.mysql.settings</option>.
'';
example = literalExpression ''
pkgs.writeText "my.cnf" '''
[mysqld]
datadir = /var/lib/mysql
bind-address = 127.0.0.1
port = 3336
!includedir /etc/mysql/conf.d/
''';
'';
};
settings = mkOption {
type = format.type;
default = {};
description = ''
MySQL configuration. Refer to
<link xlink:href="https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html"/>,
<link xlink:href="https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html"/>,
and <link xlink:href="https://mariadb.com/kb/en/server-system-variables/"/>
for details on supported values.
<note>
<para>
MySQL configuration options such as <literal>--quick</literal> should be treated as
boolean options and provided values such as <literal>true</literal>, <literal>false</literal>,
<literal>1</literal>, or <literal>0</literal>. See the provided example below.
</para>
</note>
'';
example = literalExpression ''
{
mysqld = {
key_buffer_size = "6G";
table_cache = 1600;
log-error = "/var/log/mysql_err.log";
plugin-load-add = [ "server_audit" "ed25519=auth_ed25519" ];
};
mysqldump = {
quick = true;
max_allowed_packet = "16M";
};
}
'';
};
initialDatabases = mkOption {
type = types.listOf (types.submodule {
options = {
name = mkOption {
type = types.str;
description = ''
The name of the database to create.
'';
};
schema = mkOption {
type = types.nullOr types.path;
default = null;
description = ''
The initial schema of the database; if null (the default),
an empty database is created.
'';
};
};
});
default = [];
description = ''
List of database names and their initial schemas that should be used to create databases on the first startup
of MySQL. The schema attribute is optional: If not specified, an empty database is created.
'';
example = [
{ name = "foodatabase"; schema = literalExpression "./foodatabase.sql"; }
{ name = "bardatabase"; }
];
};
initialScript = mkOption {
type = types.nullOr types.path;
default = null;
description = "A file containing SQL statements to be executed on the first startup. Can be used for granting certain permissions on the database.";
};
ensureDatabases = mkOption {
type = types.listOf types.str;
default = [];
description = ''
Ensures that the specified databases exist.
This option will never delete existing databases, especially not when the value of this
option is changed. This means that databases created once through this option or
otherwise have to be removed manually.
'';
example = [
"nextcloud"
"matomo"
];
};
ensureUsers = mkOption {
type = types.listOf (types.submodule {
options = {
name = mkOption {
type = types.str;
description = ''
Name of the user to ensure.
'';
};
ensurePermissions = mkOption {
type = types.attrsOf types.str;
default = {};
description = ''
Permissions to ensure for the user, specified as attribute set.
The attribute names specify the database and tables to grant the permissions for,
separated by a dot. You may use wildcards here.
The attribute values specfiy the permissions to grant.
You may specify one or multiple comma-separated SQL privileges here.
For more information on how to specify the target
and on which privileges exist, see the
<link xlink:href="https://mariadb.com/kb/en/library/grant/">GRANT syntax</link>.
The attributes are used as <code>GRANT ''${attrName} ON ''${attrValue}</code>.
'';
example = literalExpression ''
{
"database.*" = "ALL PRIVILEGES";
"*.*" = "SELECT, LOCK TABLES";
}
'';
};
};
});
default = [];
description = ''
Ensures that the specified users exist and have at least the ensured permissions.
The MySQL users will be identified using Unix socket authentication. This authenticates the Unix user with the
same name only, and that without the need for a password.
This option will never delete existing users or remove permissions, especially not when the value of this
option is changed. This means that users created and permissions assigned once through this option or
otherwise have to be removed manually.
'';
example = literalExpression ''
[
{
name = "nextcloud";
ensurePermissions = {
"nextcloud.*" = "ALL PRIVILEGES";
};
}
{
name = "backup";
ensurePermissions = {
"*.*" = "SELECT, LOCK TABLES";
};
}
]
'';
};
replication = {
role = mkOption {
type = types.enum [ "master" "slave" "none" ];
default = "none";
description = "Role of the MySQL server instance.";
};
serverId = mkOption {
type = types.int;
default = 1;
description = "Id of the MySQL server instance. This number must be unique for each instance.";
};
masterHost = mkOption {
type = types.str;
description = "Hostname of the MySQL master server.";
};
slaveHost = mkOption {
type = types.str;
description = "Hostname of the MySQL slave server.";
};
masterUser = mkOption {
type = types.str;
description = "Username of the MySQL replication user.";
};
masterPassword = mkOption {
type = types.str;
description = "Password of the MySQL replication user.";
};
masterPort = mkOption {
type = types.int;
default = 3306;
description = "Port number on which the MySQL master server runs.";
};
};
};
};
###### implementation
config = mkIf config.services.mysql.enable {
services.mysql.dataDir =
mkDefault (if versionAtLeast config.system.stateVersion "17.09" then "/var/lib/mysql"
else "/var/mysql");
services.mysql.settings.mysqld = mkMerge [
{
datadir = cfg.dataDir;
bind-address = mkIf (cfg.bind != null) cfg.bind;
port = cfg.port;
}
(mkIf (cfg.replication.role == "master" || cfg.replication.role == "slave") {
log-bin = "mysql-bin-${toString cfg.replication.serverId}";
log-bin-index = "mysql-bin-${toString cfg.replication.serverId}.index";
relay-log = "mysql-relay-bin";
server-id = cfg.replication.serverId;
binlog-ignore-db = [ "information_schema" "performance_schema" "mysql" ];
})
(mkIf (!isMariaDB) {
plugin-load-add = "auth_socket.so";
})
];
users.users = optionalAttrs (cfg.user == "mysql") {
mysql = {
description = "MySQL server user";
group = cfg.group;
uid = config.ids.uids.mysql;
};
};
users.groups = optionalAttrs (cfg.group == "mysql") {
mysql.gid = config.ids.gids.mysql;
};
environment.systemPackages = [ cfg.package ];
environment.etc."my.cnf".source = cfg.configFile;
systemd.services.mysql = let
hasNotify = isMariaDB;
in {
description = "MySQL Server";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
restartTriggers = [ cfg.configFile ];
unitConfig.RequiresMountsFor = "${cfg.dataDir}";
path = [
# Needed for the mysql_install_db command in the preStart script
# which calls the hostname command.
pkgs.nettools
];
preStart = if isMariaDB then ''
if ! test -e ${cfg.dataDir}/mysql; then
${cfg.package}/bin/mysql_install_db --defaults-file=/etc/my.cnf ${mysqldOptions}
touch ${cfg.dataDir}/mysql_init
fi
'' else ''
if ! test -e ${cfg.dataDir}
|