PT-SLAVE-FIND(1p) User Contributed Perl Documentation PT-SLAVE-FIND(1p)
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
<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: string
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:
o 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
o 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.
o A
dsn: charset; copy: yes
Default character set.
o D
dsn: database; copy: yes
Default database.
o F
dsn: mysql_read_default_file; copy: yes
Only read default options from the given file
o h
dsn: host; copy: yes
Connect to host.
o p
dsn: password; copy: yes
Password to use when connecting.
o P
dsn: port; copy: yes
Port number to use for connection.
o S
dsn: mysql_socket; copy: yes
Socket file to use for connection.
o 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 <http://www.percona.com/bugs/pt-slave-find>.
Please report bugs at https://bugs.launchpad.net/percona-toolkit <https://bugs.launchpad.net/percona-toolkit>. Include the following
information in your bug report:
o Complete command-line used to run the tool
o Tool "--version"
o MySQL version of all servers involved
o Output from the tool including STDERR
o 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/ <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 copyright 2007-2011 Baron Schwartz, 2011-2012 Percona Inc. Feedback and improvements are welcome.
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 2.1.2
perl v5.14.2 2012-06-15 PT-SLAVE-FIND(1p)