Provided by: percona-toolkit_3.2.1-1_all 
NAME
pt-slave-find - Find and print replication hierarchy tree of MySQL slaves.
SYNOPSIS
Usage: pt-slave-find [OPTIONS] [DSN]
pt-slave-find finds and prints a hierarchy tree of MySQL slaves.
Examples:
pt-slave-find --host master-host
RISKS
Percona Toolkit is mature, proven in the real world, and well tested, but all database tools can pose a
risk to the system and the database server. Before using this tool, please:
• Read the tool's documentation
• Review the tool's known "BUGS"
• Test the tool on a non-production server
• Backup your production server and verify the backups
DESCRIPTION
pt-slave-find connects to a MySQL replication master and finds its slaves. Currently the only thing it
can do is print a tree-like view of the replication hierarchy.
The master host can be specified using one of two methods. The first method is to use the standard
connection-related command line options: "--defaults-file", "--password", "--host", "--port", "--socket"
or "--user".
The second method to specify the master host is a DSN. A DSN is a special syntax that can be either just
a hostname (like "server.domain.com" or 1.2.3.4), or a "key=value,key=value" string. Keys are a single
letter:
KEY MEANING
=== =======
h Connect to host
P Port number to use for connection
S Socket file to use for connection
u User for login if not current user
p Password to use when connecting
F Only read default options from the given file
"pt-slave-find" reads all normal MySQL option files, such as ~/.my.cnf, so you may not need to specify
username, password and other common options at all.
EXIT STATUS
An exit status of 0 (sometimes also called a return value or return code) indicates success. Any other
value represents the exit status of the Perl process itself.
OPTIONS
This tool accepts additional command-line arguments. Refer to the "SYNOPSIS" and usage information for
details.
--ask-pass
Prompt for a password when connecting to MySQL.
--charset
short form: -A; type: string
Default character set. If the value is utf8, sets Perl's binmode on STDOUT to utf8, passes the
mysql_enable_utf8 option to DBD::mysql, and runs SET NAMES UTF8 after connecting to MySQL. Any other
value sets binmode on STDOUT without the utf8 layer, and runs SET NAMES after connecting to MySQL.
--config
type: Array
Read this comma-separated list of config files; if specified, this must be the first option on the
command line.
--database
type: string; short form: -D
Database to use.
--defaults-file
short form: -F; type: string
Only read mysql options from the given file. You must give an absolute pathname.
--help
Show help and exit.
--host
short form: -h; type: string
Connect to host.
--password
short form: -p; type: string
Password to use when connecting. If password contains commas they must be escaped with a backslash:
"exam\,ple"
--pid
type: string
Create the given PID file. The tool won't start if the PID file already exists and the PID it
contains is different than the current PID. However, if the PID file exists and the PID it contains
is no longer running, the tool will overwrite the PID file with the current PID. The PID file is
removed automatically when the tool exits.
--port
short form: -P; type: int
Port number to use for connection.
--recurse
type: int
Number of levels to recurse in the hierarchy. Default is infinite.
See "--recursion-method".
--recursion-method
type: array; default: processlist,hosts
Preferred recursion method used to find slaves.
Possible methods are:
METHOD USES
=========== ==================
processlist SHOW PROCESSLIST
hosts SHOW SLAVE HOSTS
none Do not find slaves
The processlist method is preferred because SHOW SLAVE HOSTS is not reliable. However, the hosts
method is required if the server uses a non-standard port (not 3306). Usually pt-slave-find does the
right thing and finds the slaves, but you may give a preferred method and it will be used first. If
it doesn't find any slaves, the other methods will be tried.
--report-format
type: string; default: summary
Set what information about the slaves is printed. The report format can be one of the following:
• hostname
Print just the hostname name of the slaves. It looks like:
127.0.0.1:12345
+- 127.0.0.1:12346
+- 127.0.0.1:12347
• summary
Print a summary of each slave's settings. This report shows more information about each slave,
like:
127.0.0.1:12345
Version 5.1.34-log
Server ID 12345
Uptime 04:56 (started 2010-06-17T11:21:22)
Replication Is not a slave, has 1 slaves connected
Filters
Binary logging STATEMENT
Slave status
Slave mode STRICT
Auto-increment increment 1, offset 1
+- 127.0.0.1:12346
Version 5.1.34-log
Server ID 12346
Uptime 04:54 (started 2010-06-17T11:21:24)
Replication Is a slave, has 1 slaves connected
Filters
Binary logging STATEMENT
Slave status 0 seconds behind, running, no errors
Slave mode STRICT
Auto-increment increment 1, offset 1
--resolve-address
Resolve ip-address to hostname. Report will print both IP and hostname.
Example:
10.10.7.14 (dbase1.sample.net)
Might delay runtime a few seconds.
--slave-user
type: string
Sets the user to be used to connect to the slaves. This parameter allows you to have a different
user with less privileges on the slaves but that user must exist on all slaves.
--slave-password
type: string
Sets the password to be used to connect to the slaves. It can be used with --slave-user and the
password for the user must be the same on all slaves.
--set-vars
type: Array
Set the MySQL variables in this comma-separated list of "variable=value" pairs.
By default, the tool sets:
wait_timeout=10000
Variables specified on the command line override these defaults. For example, specifying "--set-vars
wait_timeout=500" overrides the defaultvalue of 10000.
The tool prints a warning and continues if a variable cannot be set.
--socket
short form: -S; type: string
Socket file to use for connection.
--user
short form: -u; type: string
User for login if not current user.
--version
Show version and exit.
DSN OPTIONS
These DSN options are used to create a DSN. Each option is given like "option=value". The options are
case-sensitive, so P and p are not the same option. There cannot be whitespace before or after the "="
and if the value contains whitespace it must be quoted. DSN options are comma-separated. See the
percona-toolkit manpage for full details.
• A
dsn: charset; copy: yes
Default character set.
• D
dsn: database; copy: yes
Default database.
• F
dsn: mysql_read_default_file; copy: yes
Only read default options from the given file
• h
dsn: host; copy: yes
Connect to host.
• p
dsn: password; copy: yes
Password to use when connecting. If password contains commas they must be escaped with a backslash:
"exam\,ple"
• P
dsn: port; copy: yes
Port number to use for connection.
• S
dsn: mysql_socket; copy: yes
Socket file to use for connection.
• u
dsn: user; copy: yes
User for login if not current user.
ENVIRONMENT
The environment variable "PTDEBUG" enables verbose debugging output to STDERR. To enable debugging and
capture all output to a file, run the tool like:
PTDEBUG=1 pt-slave-find ... > FILE 2>&1
Be careful: debugging output is voluminous and can generate several megabytes of output.
SYSTEM REQUIREMENTS
You need Perl, DBI, DBD::mysql, and some core packages that ought to be installed in any reasonably new
version of Perl.
BUGS
For a list of known bugs, see <http://www.percona.com/bugs/pt-slave-find>.
Please report bugs at <https://jira.percona.com/projects/PT>. Include the following information in your
bug report:
• Complete command-line used to run the tool
• Tool "--version"
• MySQL version of all servers involved
• Output from the tool including STDERR
• Input files (log/dump/config files, etc.)
If possible, include debugging output by running the tool with "PTDEBUG"; see "ENVIRONMENT".
DOWNLOADING
Visit <http://www.percona.com/software/percona-toolkit/> to download the latest release of Percona
Toolkit. Or, get the latest release from the command line:
wget percona.com/get/percona-toolkit.tar.gz
wget percona.com/get/percona-toolkit.rpm
wget percona.com/get/percona-toolkit.deb
You can also get individual tools from the latest release:
wget percona.com/get/TOOL
Replace "TOOL" with the name of any tool.
AUTHORS
Baron Schwartz and Daniel Nichter
ABOUT PERCONA TOOLKIT
This tool is part of Percona Toolkit, a collection of advanced command-line tools for MySQL developed by
Percona. Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa. Those
projects were created by Baron Schwartz and primarily developed by him and Daniel Nichter. Visit
<http://www.percona.com/software/> to learn about other free, open-source software from Percona.
COPYRIGHT, LICENSE, AND WARRANTY
This program is copyright 2011-2018 Percona LLC and/or its affiliates, 2007-2011 Baron Schwartz.
THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU
General Public License as published by the Free Software Foundation, version 2; OR the Perl Artistic
License. On UNIX and similar systems, you can issue `man perlgpl' or `man perlartistic' to read these
licenses.
You should have received a copy of the GNU General Public License along with this program; if not, write
to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
VERSION
pt-slave-find 3.2.1
perl v5.30.3 2020-08-30 PT-SLAVE-FIND(1p)