Doc patch from Jeremy Zawodny.

Minor corrections to patch.
parent ee3e0a98
......@@ -6,3 +6,4 @@ sasha@work.mysql.com
serg@hynda.mysql.fi
tim@cane.mysql.fi
tim@donna.mysql.com
jcole@tetra.spaceapes.com
......@@ -25629,10 +25629,11 @@ Starting in Version 3.23.15, @strong{MySQL} supports one-way replication
internally. One server acts as the master, while the other acts as the
slave. Note that one server could play the roles of master in one pair
and slave in the other. The master server keeps a binary log of updates
and an index file to binary logs to keep track of log rotation. The
slave upon connecting informs the master where it left off since the
last successfully propagated update, catches up on the updates, and then
blocks and waits for the master to notify it of the new updates.
(@xref{Binary log}) and an index file of binary logs to keep track of
log rotation. The slave, upon connecting, informs the master where it
left off since the last successfully propagated update, catches up on
the updates, and then blocks and waits for the master to notify it of
the new updates.
Note that if you are replicating a database, all updates to this
database should be done through the master!
......@@ -25648,54 +25649,102 @@ master. @xref{Backup}.
@node Replication Implementation, Replication HOWTO, Replication Intro, Replication
@section Replication Implementation Overview
@strong{MySQL} internal replication uses the master-slave approach. One
server is designated as the master, while the other (or others) as
slave(s). The master keeps a binary log of updates. @xref{Binary log}.
The slave connects to the master, catches up on the missed updates, and
then starts receiving updates immediately as they come to the master. If
the connection is lost, the slave will reconnect. If the master goes
down, the slave will keep trying to connect every
@code{master-connect-retry} seconds until the master comes back up and
the connection can be established. The slave keeps track of where it
left off in the replication process, so it can use the information in case
it goes down and gets restarted later.
@strong{MySQL} replication is based on the server keeping track of all
changes to your database (updates, deletes, etc) in the binary
log (@xref{Binary log}), and the slave server(s) reading the saved
queries from the master server's binary log so that the slave can
execute the same queries on its copy of the data.
It is @strong{very important} to realize that the binary log is simply a
record starting from a fixed point in time (the moment you enable binary
logging). Any slaves which you set up will need copies of all the data
from your master as it existed the moment that you enabled binary
logging on the master. If you start your slaves with data that doesn't
agree with what was on the master @strong{when the binary log was
started}, your slaves may fail.
A future Version of @strong{MySQL} is planned remove the need to keep a
(possibly large) snapshot of data for new slaves that you might wish to
set up.
Once a slave is properly configured and running, it will simply connect
to the master and wait for updates to process. If the master goes away
or the slave loses connectivity with your master, it will keep trying to
connect every @code{master-connect-retry} seconds until it is able to
reconnect and resume listening for updates.
Each slave keeps track of where it left off. The master server has no
knowledge of how many slaves there are or which ones are up-to-date at
any given time.
The next section explains the master/slave setup process in more detail.
@node Replication HOWTO, Replication Features, Replication Implementation, Replication
@section HOWTO
Below is a quick HOWTO on how to set up replication on your current
system:
Below is a quick description of how to set up complete replication on
your current @strong{MySQL} server. It assumes you want to replicate all
your databases and have not configured replication before. You will need
to shutdown your master server briefly to complete the steps outlined
below.
@itemize @bullet
@enumerate
@item
Upgrade both slave and master to Version 3.23.15 or higher. We recommend
that you always use the latest release of Version 3.23 on both the slave
and the master. The binary log format has also changed a couple of times
during development (before 3.23.29) so you should delete old binary logs
when upgrading @strong{MySQL}. In addition, the newer version will fix
some bugs and add new features. Please, do not report bugs until you
have verified that the problem is present in the latest release.
Make sure you have a recent version of @strong{MySQL} installed on the
master and slave(s).
Use Version 3.23.29 or higher. Previous releases used a different binary
log format and had bugs which have been fixed in newer releases. Please
do not report bugs until you have verified that the problem is present
in the latest release.
@item
Set up special replication user(s) on the master with the @code{FILE}
Set up a special replication user on the master with the @code{FILE}
privilege and permission to connect from all the slaves. If the user is
only doing replication, you don't need to grant him other privileges.
only doing replication (which is recommended), you don't need to grant any
additional privileges.
For example, to create a user named @code{repl} which can access your
master from any host, you might use this command:
@example
GRANT FILE ON *.* TO repl@@"%" IDENTIFIED BY '<password>';
@end example
@item
Shut down @strong{MySQL} on the master.
@example
mysqladmin -u root -p<password> shutdown
@end example
@item
Take a snapshot of all the tables/databases on the master that could
possibly be involved in the update queries before taking the next step.
Starting in Version 3.23.21, there is a command that allows you to take
a snapshot of a table on the master and copy it to the slave, called
@code{LOAD TABLE FROM MASTER}. Until Version 3.23.23, though, it has a
serious bug, and we recommend that you do not use it until you have
upgraded.
Snapshot all the data on your master server.
The easiest way to do this (on Unix) is to simply use @strong{tar} to
produce an archive of your entrie data directory. The exact data
directory location depends on your installation.
@example
tar -cvf /tmp/mysql-snapshot.tar /path/to/data-dir
@end example
Windows users can use WinZip or similar software to create an archive of
the data directory.
@item
In @code{my.cnf} on the master add @code{log-bin} and
@code{server-id=unique number} and restart it. Make sure there are no
important updates to the master between the time you have taken the
snapshot and the time the master is restarted with @code{log-bin}
option.
@code{server-id=<some unique number>} to the @code{[mysqld]} section.
@example
[mysqld]
log-bin
server-id=1
@end example
@item
Load the snapshot of the master to all the slaves.
Restart @strong{MySQL} on the master.
@item
Add the following to @code{my.cnf} on the slave(s):
......@@ -25703,32 +25752,47 @@ Add the following to @code{my.cnf} on the slave(s):
master-host=<hostname of the master>
master-user=<replication user name>
master-password=<replication user password>
server-id=<some unique number between 1 and 2^32-1>
server-id=<some unique number between 2 and 2^32-1>
@end example
replacing the values in <> with what is relevant to your system.
@code{server-id} must be different for each server participating in
replication. If you don't specify a server-id, it will be set to
1 if you have not defined @code{master-host}, else it will be set to 2.
replication. If you don't specify a server-id, it will be set to 1 if
you have not defined @code{master-host}, else it will be set to 2.
@item
Copy the snapshot data into your data directory on your slave(s). Make
sure that the privileges on the files and directories are correct. The
user which @strong{MySQL} runs as needs to be able to read and write to
them, just as on the master.
@item Restart the slave(s).
@end itemize
After you have done the above, the master and the slave(s) should be in
sync.
After you have done the above, the slave(s) should connect to the master
and catch up on any updates which happened since the snapshot was taken.
If you have forgot to set server-id for the slave you will get the following
error in the error log file:
If you have forgotten to set @code{server-id} for the slave you will get
the following error in the error log file:
@example
Warning: one should set server_id to a non-0 value if master_host is set.
The server will not act as a slave.
@end example
If you have forgot to do this for the master, the slaves will not be able to
connect to the master.
If you have forgot to do this for the master, the slaves will not be
able to connect to the master.
If a slave is not able to replicate for any reason, you will find error
messages in the error log on the slave.
Once a slave is replicating, you will find a file called
@code{master.info} in the same directory as your error log. The
@code{master.info} file is used by the slave to keep track of how much
of the master's binary log it has processed. @strong{Do not} remove or
edit this file.
@cindex options, replication
@cindex @code{my.cnf} file
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