Provided by: mysql-utilities_1.6.4-1build1_all 
NAME
mysqlrplms - Set Up and Start Replication from a Slave to Multiple Masters
SYNOPSIS
mysqlrplms [options]
DESCRIPTION
This utility permits a user to start replication from multiple master servers (also called
multi-source replication) to a single slave. The user provides login information for the
slave and each of the masters.
The utility reports conditions where the storage engines on the masters and the slave
differ. It also reports a warning if the InnoDB storage engine differs on the master and
slave. For InnoDB to be the same, both servers must be running the same "type" of InnoDB
(built-in or the InnoDB Plugin), and InnoDB on both servers must have the same major and
minor version numbers and enabled state. By default, the utility issues warnings for
mismatches between the sets of storage engines, the default storage engine, and the InnoDB
storage engine.
The -vv option displays any discrepancies between the storage engines and InnoDB values.
A round-robin scheduling is used to setup replication among the masters and slave.
The mysqlrplms utility follows these assumptions:
· All servers must have GTIDs enabled.
· There are no conflicts between transactions from different masters. For example, there
are no updates to the same object from multiple masters.
· Replication is asynchronous.
OPTIONS.PP mysqlrplms accepts the following command-line options:
· --daemon=<command>
Run as a daemon. The command can be start (start daemon), stop (stop daemon), restart
(stop then start the daemon) or nodetach (start but do not detach the process). This
option is only available for POSIX systems.
· --format=<format>, -f <format>
Display the replication health output in either grid (default), tab, csv, or vertical
format.
· --help
Display a help message and exit.
· --interval=<seconds>, -i <seconds>
Interval in seconds for reporting health. Default = 15 seconds. Minimum is 5 seconds.
· --license
Display license information and exit.
· --log=<log_file>
Specify a log file to use for logging messages
· --log-age=<days>
Specify maximum age of log entries in days. Entries older than this will be purged on
startup. Default = 7 days.
· --masters=<master connections>
Connection information for master servers. List multiple masters in comma-separated
list.
To connect to a server, it is necessary to specify connection parameters such as the
user name, host name, password, and either a port or socket. MySQL Utilities provides
a number of ways to supply this information. All of the methods require specifying
your choice via a command-line option such as --server, --master, --slave, etc. The
methods include the following in order of most secure to least secure.
· Use login-paths from your .mylogin.cnf file (encrypted, not visible). Example :
<login-path>[:<port>][:<socket>]
· Use a configuration file (unencrypted, not visible) Note: available in
release-1.5.0. Example : <configuration-file-path>[:<section>]
· Specify the data on the command-line (unencrypted, visible). Example :
<user>[:<passwd>]@<host>[:<port>][:<socket>]
· --report-values=<report_values>
Report values used in mysqlrplms. It can be health, gtid or uuid. Multiple values can
be used separated by commas.
· health
Display the replication health of the topology.
· gtid
Display the master's list of executed GTIDs, contents of the GTID variables;
@@GLOBAL.GTID_EXECUTED, @@GLOBAL.GTID_PURGED and @@GLOBAL.GTID_OWNED.
· uuid
Display universally unique identifiers (UUIDs) for all servers.
Default = health.
· --rpl-user=<replication_user>
The user and password for the replication user, in the format: <user>[:<password>] or
<login-path>.
· --slave=<slave>
Connection information for the slave server.
To connect to a server, it is necessary to specify connection parameters such as the
user name, host name, password, and either a port or socket. MySQL Utilities provides
a number of ways to supply this information. All of the methods require specifying
your choice via a command-line option such as --server, --master, --slave, etc. The
methods include the following in order of most secure to least secure.
· Use login-paths from your .mylogin.cnf file (encrypted, not visible). Example :
<login-path>[:<port>][:<socket>]
· Use a configuration file (unencrypted, not visible) Note: available in
release-1.5.0. Example : <configuration-file-path>[:<section>]
· Specify the data on the command-line (unencrypted, visible). Example :
<user>[:<passwd>]@<host>[:<port>][:<socket>]
· --ssl-ca
The path to a file that contains a list of trusted SSL CAs.
· --ssl-cert
The name of the SSL certificate file to use for establishing a secure connection.
· --ssl-cert
The name of the SSL key file to use for establishing a secure connection.
· --ssl
Specifies if the server connection requires use of SSL. If an encrypted connection
cannot be established, the connection attempt fails. Default setting is 0 (SSL not
required).
· --start-from-beginning, -b
Start replication at the beginning of events logged in the master binary log.
· --switchover-interval=<seconds>
Interval in seconds for switching masters. Default = 60 seconds. Minimum is 30
seconds.
· --pidfile=<pidfile>
Pidfile for running mysqlrplms as a daemon. This file contains the PID (process
identifier), that uniquely identify a process. It is needed to identify and control
the process forked by mysqlrplms.
· --verbose, -v
Specify how much information to display. Use this option multiple times to increase
the amount of information. For example, -v = verbose, -vv = more verbose, -vvv =
debug.
· --version
Display version information and exit.
NOTES.PP The login user for the master servers must have the appropriate permissions to
grant access to all databases, and have the ability to create user accounts. For example,
the user accounts used to connect to each of the masters must have the WITH GRANT OPTION
privilege.
The server IDs on the masters and slave must be nonzero and unique. The utility reports an
error if the server ID is 0 on either server or the same on the masters and slave. Set
these values before starting this utility.
Mixing IP and hostnames is not recommended. The replication-specific utilities will
attempt to compare hostnames and IP addresses as aliases for checking slave connectivity
to the master. However, if your installation does not support reverse name lookup, the
comparison could fail. Without the ability to do a reverse name lookup, the replication
utilities could report a false negative that the slave is (not) connected to the master.
The path to the MySQL client tools should be included in the PATH environment variable in
order to use the authentication mechanism with login-paths. This will allow the utility to
use the my_print_defaults tools which is required to read the login-path values from the
login configuration file (.mylogin.cnf).
Due to a known server issue, there are some limitations with the use of temporary tables
with multi-source replication. In order to avoid problems, we recommend the execution of
all statements for a temporary table in a single transaction. See Replication and
Temporary Tables[1], for more information. EXAMPLES.PP To set up multi-source replication
among two masters and a slave, running on different ports of the same host using the
default settings, use this command:
shell> mysqlrplms --slave=root:root@localhost:3306 \
--masters=root:root@localhost:3307,root:root@localhost:3308
# Starting multi-source replication...
# Press CTRL+C to quit.
# Switching to master 'localhost:3307'.
# master on localhost: ... connected.
# slave on localhost: ... connected.
#
# Current Master Information:
+-------------------+-----------+---------------+-------------------+
| Binary Log File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+-----------+---------------+-------------------+
| clone-bin.000001 | 594 | N/A | N/A |
+-------------------+-----------+---------------+-------------------+
# GTID Executed Set: 00a4e027-a83a-11e3-8bd6-28d244017f26:1-2
#
# Health Status:
+------------+-------+---------+--------+------------+---------+
| host | port | role | state | gtid_mode | health |
+------------+-------+---------+--------+------------+---------+
| localhost | 3307 | MASTER | UP | ON | OK |
| localhost | 3306 | SLAVE | UP | ON | OK |
| localhost | 3308 | MASTER | UP | ON | OK |
+------------+-------+---------+--------+------------+---------+
#
(...)
The following command uses --report-values to report health, GTID and UUID status:
shell> mysqlrplms --slave=root:root@localhost:3306 \
--masters=root:root@localhost:3307,root:root@localhost:3308\n
--report-values=health,gtid,uuid
# Starting multi-source replication...
# Press CTRL+C to quit.
# Switching to master 'localhost:3307'.
# master on localhost: ... connected.
# slave on localhost: ... connected.
#
# Current Master Information:
+-------------------+-----------+---------------+-------------------+
| Binary Log File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+-----------+---------------+-------------------+
| clone-bin.000001 | 594 | N/A | N/A |
+-------------------+-----------+---------------+-------------------+
# GTID Executed Set: 00a4e027-a83a-11e3-8bd6-28d244017f26:1-2
#
# Health Status:
+------------+-------+---------+--------+------------+---------+
| host | port | role | state | gtid_mode | health |
+------------+-------+---------+--------+------------+---------+
| localhost | 3307 | MASTER | UP | ON | OK |
| localhost | 3306 | SLAVE | UP | ON | OK |
| localhost | 3308 | MASTER | UP | ON | OK |
+------------+-------+---------+--------+------------+---------+
#
# GTID Status - Transactions executed on the servers:
+------------+-------+---------+-------------------------------------------+
| host | port | role | gtid |
+------------+-------+---------+-------------------------------------------+
| localhost | 3307 | MASTER | 00a4e027-a83a-11e3-8bd6-28d244017f26:1-2 |
| localhost | 3306 | SLAVE | 00a4e027-a83a-11e3-8bd6-28d244017f26:1-2 |
| localhost | 3306 | SLAVE | faf0874f-a839-11e3-8bd6-28d244017f26:1 |
+------------+-------+---------+-------------------------------------------+
#
# UUID Status:
+------------+-------+---------+---------------------------------------+
| host | port | role | uuid |
+------------+-------+---------+---------------------------------------+
| localhost | 3307 | MASTER | 00a4e027-a83a-11e3-8bd6-28d244017f26 |
| localhost | 3306 | SLAVE | faf0874f-a839-11e3-8bd6-28d244017f26 |
+------------+-------+---------+---------------------------------------+
#
(...)
Start multi-source replication running as a daemon (POSIX only):
shell> mysqlrplms --slave=root:root@localhost:3306 \
--masters=root:root@localhost:3307,root:root@localhost:3308 \
--log=rplms_daemon.log --pidfile=rplms_daemon.pid --daemon=start
Restart multi-source replication running as a daemon:
shell> mysqlrplms --slave=root:root@localhost:3306 \
--masters=root:root@localhost:3307,root:root@localhost:3308 \
--log=rplms_daemon.log --pidfile=rplms_daemon.pid --daemon=restart
Stop multi-source replication running as a daemon:
shell> mysqlrplms --slave=root:root@localhost:3306 \
--masters=root:root@localhost:3307,root:root@localhost:3308 \
--log=rplms_daemon.log --pidfile=rplms_daemon.pid --daemon=stop
RECOMMENDATIONS.PP You should set read_only=1 in the my.cnf file for the slave to ensure
that no accidental data changes, such as INSERT, DELETE, UPDATE, and so forth, are
permitted on the slave other than those produced by events read from the master.
PERMISSIONS REQUIRED.PP The users on the masters need the following privileges: SELECT and
INSERT privileges on mysql database, REPLICATION SLAVE, REPLICATION CLIENT and GRANT
OPTION. The slave users need the SUPER privilege. The rpl user, used as the argument for
the --rpl-user option, is either created automatically or if it exists, it needs the
REPLICATION SLAVE privilege.
COPYRIGHT
Copyright © 2006, 2016, Oracle and/or its affiliates. All rights reserved.
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 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. 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 02110-1301 USA or see http://www.gnu.org/licenses/.
NOTES
1. Replication and Temporary Tables
http://dev.mysql.com/doc/refman/5.7/en/replication-features-temptables.html
SEE ALSO
For more information, please refer to the MySQL Utilities and Fabric documentation, which
is available online at http://dev.mysql.com/doc/index-utils-fabric.html
AUTHOR
Oracle Corporation (http://dev.mysql.com/).