mysql master > slave

[ants]

I followed the tutorial at
http://www.howtoforge.com/how-to-set...n-debian-lenny
pretty much word for word.

Then when I get to the part where I run

SHOW MASTER STATUS;

I never get anything returned. Have have been trying to set up replication in side a couple of vmware images before I run it on the real production servers. For the life of me I can not figure out what I am doing wrong. I simply get zero rows returned when I run

SHOW MASTER STATUS;

Also I would rather replicate only one table instead of the whole database. Is that possible, and how would that be accomplished. I had trouble finding any information on how to accomplish replicating only one table in the database.

[falko]

Are there any MySQL errors in your logs?

[ants]

There is nothing in the mysql logs.

I double checked that the slave_user has the correct permissions in the mysql database user table to do replication.

The required entries are in /etc/mysql/my.cnf

Some stuff works as expected, like turning on ssl and certificate locaitons

mysql> show variables like '%ssl%';
+---------------+-----------------------------------------+
| Variable_name | Value |
+---------------+-----------------------------------------+
| have_openssl | YES |
| have_ssl | YES |
| ssl_ca | /etc/mysql/certificates/ca-cert.pem |
| ssl_capath | |
| ssl_cert | /etc/mysql/certificates/server-cert.pem |
| ssl_cipher | |
| ssl_key | /etc/mysql/certificates/server-key.pem |
+---------------+-----------------------------------------+
7 rows in set (0.00 sec)

But I can not get "SHOW MASTER STATUS;" to work.

mysql> SHOW MASTER STATUS;
Empty set (0.00 sec)

[falko]

Can you post your /etc/mysql/my.cnf?

[ants]

The /etc/mysql/my.cnf

Not much was changed, only the ssl certificates and the replication.

mysqlserver:~# cat /etc/mysql/my.cnf
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/se...variables.html

# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock

# Here is entries for some specific programs
# The following values assume you have at least 32M ram

# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0

[mysqld]
#
# * Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
language = /usr/share/mysql/english
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 128K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
#max_connections = 100
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
#log = /var/log/mysql/mysql.log
#
# Error logging goes to syslog. This is a Debian improvement
#
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * BerkeleyDB
#
# Using BerkeleyDB is now discouraged as its support will cease in 5.1.12.
skip-bdb
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
# You might want to disable InnoDB to shrink the mysqld process by circa 100MB.
#skip-innodb
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
ssl
ssl-ca=/etc/mysql/certificates/ca-cert.pem
ssl-cert=/etc/mysql/certificates/server-cert.pem
ssl-key=/etc/mysql/certificates/server-key.pem

# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem



[mysqldump]
quick
quote-names
max_allowed_packet = 16M

[mysql]
#no-auto-rehash # faster start of mysql but no tab completition

[isamchk]
key_buffer = 16M

#
# * NDB Cluster
#
# See /usr/share/doc/mysql-server-*/README.Debian for more information.
#
# The following configuration is read by the NDB Data Nodes (ndbd processes)
# not from the NDB Management Nodes (ndb_mgmd processes).
#
# [MYSQL_CLUSTER]
# ndb-connectstring=127.0.0.1
server-id = 1
log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
binlog_do_db = radius


#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/

[falko]

You need

server-id               = 1
log_bin                 = /var/log/mysql/mysql-bin.log
expire_logs_days        = 10
max_binlog_size         = 100M
binlog_do_db            = exampledb

in the [mysqld] section, not in [MYSQL_CLUSTER].

[ants]

That was the trick that I needed

mysql> SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 | 98 | radius | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

I did not realize that sections matter. Most of the time when editing config files it does not really matter where in the file it is as long as the right syntax accompanies it.


Is it possible to only replicate only one table from the database? How would I accomplish replicating only one table, so I can write to the rest.

[falko]

You can do it as follows:

replicate-do-db = yourdb
replicate-ignore-table=yourdb.table1
replicate-ignore-table=yourdb.table2
...

Add replicate-ignore-table lines for all tables that you don't want to replicate.