pt-slave-find¶

NAME¶

pt-slave-find - Find and print replication hierarchy tree of MySQL slaves.

SYNOPSIS¶

Usage¶

pt-slave-find [OPTION...] MASTER-HOST

pt-slave-find finds and prints a hierarchy tree of MySQL slaves.

Examples¶

pt-slave-find --host master-host

RISKS¶

The following section is included to inform users about the potential risks, whether known or unknown, of using this tool. The two main categories of risks are those created by the nature of the tool (e.g. read-only tools vs. read-write tools) and those created by bugs.

pt-slave-find is read-only and very low-risk.

At the time of this release, we know of no bugs that could cause serious harm to users.

The authoritative source for updated information is always the online issue tracking system. Issues that affect this tool will be marked as such. You can see a list of such issues at the following URL: http://www.percona.com/bugs/pt-slave-find.

See also “BUGS” for more information on filing bugs and getting help.

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.

--pid¶

type: string

Create the given PID file. The file contains the process ID of the script. The PID file is removed when the script exits. Before starting, the script checks if the PID file already exists. If it does not, then the script creates and writes its own PID to it. If it does, then the script checks the following: if the file contains a PID and a process is running with that PID, then the script dies; or, if there is no process running with that PID, then the script overwrites the file with its own PID and starts; else, if the file contains no PID, then the script dies.

--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

--set-vars¶

type: string; default: wait_timeout=10000

Set these MySQL variables. Immediately after connecting to MySQL, this string will be appended to SET and executed.

--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.

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://bugs.launchpad.net/percona-toolkit. 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 developed by Percona for MySQL support and consulting. Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa. Those projects were created by Baron Schwartz and developed primarily by him and Daniel Nichter, both of whom are employed by Percona. Visit http://www.percona.com/software/ for more software developed by Percona.

COPYRIGHT, LICENSE, AND WARRANTY¶

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 2.1.9

pt-slave-find¶

NAME¶

SYNOPSIS¶

Usage¶

Examples¶

RISKS¶

DESCRIPTION¶

EXIT STATUS¶

OPTIONS¶

DSN OPTIONS¶

ENVIRONMENT¶

SYSTEM REQUIREMENTS¶

BUGS¶

DOWNLOADING¶

AUTHORS¶

ABOUT PERCONA TOOLKIT¶

COPYRIGHT, LICENSE, AND WARRANTY¶

VERSION¶

Percona Toolkit Series

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pt-slave-find¶

NAME¶

SYNOPSIS¶

Usage¶

Examples¶

RISKS¶

DESCRIPTION¶

EXIT STATUS¶

OPTIONS¶

DSN OPTIONS¶

ENVIRONMENT¶

SYSTEM REQUIREMENTS¶

BUGS¶

DOWNLOADING¶

AUTHORS¶

ABOUT PERCONA TOOLKIT¶

COPYRIGHT, LICENSE, AND WARRANTY¶

VERSION¶

Navigation

Percona Toolkit Series

Table Of Contents

Previous topic

Next topic

This Page

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