mysqld_safe(1) — Linux manual page


MARIADBD-SAFE(1)         MariaDB Database System        MARIADBD-SAFE(1)

NAME         top

       mariadbd-safe - MariaDB server startup script (mysqld_safe is now
       a symlink to mariadbd-safe)

SYNOPSIS         top

       mysqld_safe options

DESCRIPTION         top

       mysqld_safe is the recommended way to start a mysqld server on
       Unix.  mysqld_safe adds some safety features such as restarting
       the server when an error occurs and logging runtime information
       to an error log file. Descriptions of error logging is given
       later in this section.

       mysqld_safe tries to start an executable named mysqld. To
       override the default behavior and specify explicitly the name of
       the server you want to run, specify a --mysqld or
       --mysqld-version option to mysqld_safe. You can also use --ledir
       to indicate the directory where mysqld_safe should look for the

       Many of the options to mysqld_safe are the same as the options to

       Options unknown to mysqld_safe are passed to mysqld if they are
       specified on the command line, but ignored if they are specified
       in the [mysqld_safe] or [mariadb_safe] groups of an option file.

       mysqld_safe reads all options from the [mysqld], [server],
       [mysqld_safe], and [mariadb_safe] sections in option files. For
       example, if you specify a [mysqld] section like this, mysqld_safe
       will find and use the --log-error option:


       For backward compatibility, mysqld_safe also reads [safe_mysqld]
       sections, although you should rename such sections to
       [mysqld_safe] in current installations.

       mysqld_safe supports the options in the following list. It also
       reads option files and supports the options for processing them.

       •   --help

           Display a help message and exit.

       •   --basedir=path

           The path to the MariaDB installation directory.

       •   --core-file-size=size

           The size of the core file that mysqld should be able to
           create. The option value is passed to ulimit -c.

       •   --crash-script=file

           Script to call in the event of mysqld crashing.

       •   --datadir=path

           The path to the data directory.

       •   --defaults-extra-file=path

           The name of an option file to be read in addition to the
           usual option files. This must be the first option on the
           command line if it is used. If the file does not exist or is
           otherwise inaccessible, the server will exit with an error.

       •   --defaults-file=file_name

           The name of an option file to be read instead of the usual
           option files. This must be the first option on the command
           line if it is used.

       •   --flush-caches

           Flush and purge buffers/caches before starting the server.

       •   --ledir=path

           If mysqld_safe cannot find the server, use this option to
           indicate the path name to the directory where the server is

       •   --log-error=file_name

           Write the error log to the given file.

       •   --malloc-lib=lib

           Preload shared library lib if available.

       •   --mysqld=prog_name

           The name of the server program (in the ledir directory) that
           you want to start. This option is needed if you use the
           MariaDB binary distribution but have the data directory
           outside of the binary distribution. If mysqld_safe cannot
           find the server, use the --ledir option to indicate the path
           name to the directory where the server is located.

       •   --mysqld-version=suffix

           This option is similar to the --mysqld option, but you
           specify only the suffix for the server program name. The
           basename is assumed to be mysqld. For example, if you use
           --mysqld-version=debug, mysqld_safe starts the mysqld-debug
           program in the ledir directory. If the argument to
           --mysqld-version is empty, mysqld_safe uses mysqld in the
           ledir directory.

       •   --nice=priority

           Use the nice program to set the server´s scheduling priority
           to the given value.

       •   --no-auto-restart, --nowatch, --no-watch

           Exit after starting mysqld.

       •   --no-defaults

           Do not read any option files. This must be the first option
           on the command line if it is used.

       •   --numa-interleave

           Run mysqld with its memory interleaved on all NUMA nodes.

       •   --open-files-limit=count

           The number of files that mysqld should be able to open. The
           option value is passed to ulimit -n. Note that you need to
           start mysqld_safe as root for this to work properly!

       •   --pid-file=file_name

           The path name of the process ID file.

       •   --plugin-dir=dir_name

           Directory for client-side plugins.

       •   --port=port_num

           The port number that the server should use when listening for
           TCP/IP connections. The port number must be 1024 or higher
           unless the server is started by the root system user.

       •   --skip-kill-mysqld

           Do not try to kill stray mysqld processes at startup. This
           option works only on Linux.

       •   --socket=path

           The Unix socket file that the server should use when
           listening for local connections.

       •   --syslog, --skip-syslog

           --syslog causes error messages to be sent to syslog on
           systems that support the logger program.  --skip-syslog
           suppresses the use of syslog; messages are written to an
           error log file.

       •   --syslog-tag=tag

           For logging to syslog, messages from mysqld_safe and mysqld
           are written with a tag of mysqld_safe and mysqld,
           respectively. To specify a suffix for the tag, use
           --syslog-tag=tag, which modifies the tags to be
           mysqld_safe-tag and mysqld-tag.

       •   --timezone=timezone

           Set the TZ time zone environment variable to the given option
           value. Consult your operating system documentation for legal
           time zone specification formats.

       •   --user={user_name|user_id}

           Run the mysqld server as the user having the name user_name
           or the numeric user ID user_id. (“User” in this context
           refers to a system login account, not a MariaDB user listed
           in the grant tables.)

       If you execute mysqld_safe with the --defaults-file or
       --defaults-extra-file option to name an option file, the option
       must be the first one given on the command line or the option
       file will not be used. For example, this command will not use the
       named option file:

           mysql> mysqld_safe --port=port_num --defaults-file=file_name

       Instead, use the following command:

           mysql> mysqld_safe --defaults-file=file_name --port=port_num

       The mysqld_safe script is written so that it normally can start a
       server that was installed from either a source or a binary
       distribution of MariaDB, even though these types of distributions
       typically install the server in slightly different locations.
       mysqld_safe expects one of the following conditions to be true:

       •   The server and databases can be found relative to the working
           directory (the directory from which mysqld_safe is invoked).
           For binary distributions, mysqld_safe looks under its working
           directory for bin and data directories. For source
           distributions, it looks for libexec and var directories. This
           condition should be met if you execute mysqld_safe from your
           MariaDB installation directory (for example, /usr/local/mysql
           for a binary distribution).

       •   If the server and databases cannot be found relative to the
           working directory, mysqld_safe attempts to locate them by
           absolute path names. Typical locations are /usr/local/libexec
           and /usr/local/var. The actual locations are determined from
           the values configured into the distribution at the time it
           was built. They should be correct if MariaDB is installed in
           the location specified at configuration time.

       Because mysqld_safe tries to find the server and databases
       relative to its own working directory, you can install a binary
       distribution of MariaDB anywhere, as long as you run mysqld_safe
       from the MariaDB installation directory:

           shell> cd mysql_installation_directory
           shell> bin/mysqld_safe &

       If mysqld_safe fails, even when invoked from the MariaDB
       installation directory, you can specify the --ledir and --datadir
       options to indicate the directories in which the server and
       databases are located on your system.

       When you use mysqld_safe to start mysqld, mysqld_safe arranges
       for error (and notice) messages from itself and from mysqld to go
       to the same destination.

       There are several mysqld_safe options for controlling the
       destination of these messages:

       •   --syslog: Write error messages to syslog on systems that
           support the logger program.

       •   --skip-syslog: Do not write error messages to syslog.
           Messages are written to the default error log file
           (host_name.err in the data directory), or to a named file if
           the --log-error option is given.

       •   --log-error=file_name: Write error messages to the named
           error file.

       If none of these options is given, the default is --skip-syslog.

       If --syslog and --log-error are both given, a warning is issued
       and --log-error takes precedence.

       When mysqld_safe writes a message, notices go to the logging
       destination (syslog or the error log file) and stdout. Errors go
       to the logging destination and stderr.

       Normally, you should not edit the mysqld_safe script. Instead,
       configure mysqld_safe by using command-line options or options in
       the [mysqld_safe] section of a my.cnf option file. In rare cases,
       it might be necessary to edit mysqld_safe to get it to start the
       server properly. However, if you do this, your modified version
       of mysqld_safe might be overwritten if you upgrade MariaDB in the
       future, so you should make a copy of your edited version that you
       can reinstall.

       On NetWare, mysqld_safe is a NetWare Loadable Module (NLM) that
       is ported from the original Unix shell script. It starts the
       server as follows:

        1. Runs a number of system and option checks.

        2. Runs a check on MyISAM tables.

        3. Provides a screen presence for the MariaDB server.

        4. Starts mysqld, monitors it, and restarts it if it terminates
           in error.

        5. Sends error messages from mysqld to the host_name.err file in
           the data directory.

        6. Sends mysqld_safe screen output to the file in
           the data directory.

COPYRIGHT         top

       Copyright 2007-2008 MySQL AB, 2008-2010 Sun Microsystems, Inc.,
       2010-2020 MariaDB Foundation

       This documentation is free software; you can redistribute it
       and/or modify it only under the terms of the GNU General Public
       License as published by the Free Software Foundation; version 2
       of the License.

       This documentation is distributed in the hope that it will be
       useful, but WITHOUT ANY WARRANTY; without even the implied
       See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License
       along with the program; if not, write to the Free Software
       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
       02110-1335 USA or see

SEE ALSO         top

       For more information, please refer to the MariaDB Knowledge Base,
       available online at

AUTHOR         top

       MariaDB Foundation (

COLOPHON         top

       This page is part of the MariaDB (MariaDB database server)
       project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, see ⟨⟩.
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2023-06-23.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-05-11.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
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       (which is not part of the original manual page), send a mail to

MariaDB 10.8                   15 May 2020              MARIADBD-SAFE(1)

Pages that refer to this page: mysqld_multi(1)