298 lines
9.1 KiB
Nix
298 lines
9.1 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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mysql = cfg.package;
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atLeast55 = versionAtLeast mysql.mysqlVersion "5.5";
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pidFile = "${cfg.pidDir}/mysqld.pid";
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mysqldOptions =
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"--user=${cfg.user} --datadir=${cfg.dataDir} --basedir=${mysql} " +
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"--pid-file=${pidFile}";
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myCnf = pkgs.writeText "my.cnf"
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''
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[mysqld]
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port = ${toString cfg.port}
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${optionalString (cfg.replication.role == "master" || cfg.replication.role == "slave") "log-bin=mysql-bin"}
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${optionalString (cfg.replication.role == "master" || cfg.replication.role == "slave") "server-id = ${toString cfg.replication.serverId}"}
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${optionalString (cfg.replication.role == "slave" && !atLeast55)
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''
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master-host = ${cfg.replication.masterHost}
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master-user = ${cfg.replication.masterUser}
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master-password = ${cfg.replication.masterPassword}
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master-port = ${toString cfg.replication.masterPort}
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''}
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${cfg.extraOptions}
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'';
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in
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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 = mkOption {
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type = types.bool;
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default = false;
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description = "
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Whether to enable the MySQL server.
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";
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};
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package = mkOption {
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type = types.package;
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default = pkgs.mysql;
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defaultText = "pkgs.mysql";
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example = literalExample "pkgs.mysql55";
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description = "
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Which MySQL derivation to use.
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";
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};
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port = mkOption {
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type = types.int;
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default = 3306;
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description = "Port of MySQL";
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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 = "User account under which MySQL runs";
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};
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dataDir = mkOption {
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type = types.path;
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default = "/var/mysql"; # !!! should be /var/db/mysql
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description = "Location where MySQL stores its table files";
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};
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pidDir = mkOption {
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default = "/run/mysqld";
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description = "Location of the file which stores the PID of the MySQL server";
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};
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extraOptions = mkOption {
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type = types.lines;
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default = "";
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example = ''
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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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'';
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description = ''
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Provide extra options to the MySQL configuration file.
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Please note, that these options are added to the
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<literal>[mysqld]</literal> section so you don't need to explicitly
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state it again.
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'';
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};
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initialDatabases = mkOption {
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default = [];
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description = "List of database names and their initial schemas that should be used to create databases on the first startup of MySQL";
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example = [
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{ name = "foodatabase"; schema = literalExample "./foodatabase.sql"; }
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{ name = "bardatabase"; schema = literalExample "./bardatabase.sql"; }
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];
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};
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initialScript = mkOption {
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default = null;
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description = "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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# FIXME: remove this option; it's a really bad idea.
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rootPassword = mkOption {
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default = null;
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description = "Path to a file containing the root password, modified on the first startup. Not specifying a root password will leave the root password empty.";
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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 = "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 = "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 = "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 = "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 = "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 = "Password of the MySQL replication user";
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};
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masterPort = mkOption {
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type = types.int;
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default = 3306;
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description = "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 config.services.mysql.enable {
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users.extraUsers.mysql = {
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description = "MySQL server user";
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group = "mysql";
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uid = config.ids.uids.mysql;
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};
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users.extraGroups.mysql.gid = config.ids.gids.mysql;
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environment.systemPackages = [mysql];
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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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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 =
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''
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if ! test -e ${cfg.dataDir}/mysql; then
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mkdir -m 0700 -p ${cfg.dataDir}
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chown -R ${cfg.user} ${cfg.dataDir}
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${mysql}/bin/mysql_install_db ${mysqldOptions}
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touch /tmp/mysql_init
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fi
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mkdir -m 0755 -p ${cfg.pidDir}
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chown -R ${cfg.user} ${cfg.pidDir}
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# Make the socket directory
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mkdir -p /run/mysqld
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chmod 0755 /run/mysqld
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chown -R ${cfg.user} /run/mysqld
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'';
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serviceConfig.ExecStart = "${mysql}/bin/mysqld --defaults-extra-file=${myCnf} ${mysqldOptions}";
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postStart =
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''
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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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if [ -f /tmp/mysql_init ]
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then
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${concatMapStrings (database:
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''
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# Create initial databases
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if ! test -e "${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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echo "use ${database.name};"
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if [ -f "${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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) | ${mysql}/bin/mysql -u root -N
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fi
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'') cfg.initialDatabases}
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${optionalString (cfg.replication.role == "master" && atLeast55)
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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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) | ${mysql}/bin/mysql -u root -N
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''}
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${optionalString (cfg.replication.role == "slave" && atLeast55)
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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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) | ${mysql}/bin/mysql -u root -N
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''}
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${optionalString (cfg.initialScript != null)
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''
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# Execute initial script
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cat ${cfg.initialScript} | ${mysql}/bin/mysql -u root -N
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''}
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${optionalString (cfg.rootPassword != null)
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''
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# Change root password
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( echo "use mysql;"
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echo "update user set Password=password('$(cat ${cfg.rootPassword})') where User='root';"
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echo "flush privileges;"
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) | ${mysql}/bin/mysql -u root -N
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''}
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rm /tmp/mysql_init
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fi
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''; # */
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};
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};
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}
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