Comments on: MySQL: How do you set up master-master replication in MySQL? (CentOS, RHEL, Fedora)

By: MySQL Replication Series: How does MySQL replication work? | Fredonfire

MySQL Replication Series: How does MySQL replication work? | Fredonfire — Sat, 15 Oct 2011 02:36:10 +0000

[...] following simple directions. You can learn setting up two type of replication MySQL offers here: master-master replication and master-slave replication. Once you have replication set up, you can start playing with it [...]

By: Mahendran

Mahendran — Tue, 05 Apr 2011 13:06:39 +0000

i have done the above setup but it act as master/slave…but i need master to master replication ie if i create a database in one server it will replicate on another and wise-versa …my requirement is only for redundancy…
please advice me what i have to do for master to master replication….

thanks in advance
Mahendran.R

By: pradeep

pradeep — Fri, 22 Oct 2010 07:24:06 +0000

Hi! i am new in mysql and trying to establish master master replication in mysql

on first server i have added these lines to mysqld section of my.cnf(mysql Ver 14.12 Distrib 5.0.77, for redhat-linux-gnu (i686) using readline 5.1)

datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
log-bin=/var/lib/mysql/mysql-bin.log
binlog-do-db=sample1
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
binlog-ignore-db=test2
binlog-ignore-db=sample3
binlog-ignore-db=example3
binlog-ignore-db=endpoints
binlog-ignore-db=meetme
binlog-ignore-db=test
binlog-ignore-db=sample2

server-id=1
master-host = 192.xxx.x.xxx
master-user = abc
master-password = abc_pass
master-connect-retry = 60

relay-log = /var/lib/mysql/slave-relay.log
relay-log-index = /var/lib/mysql/slave-relay-log.index

On second server i have added these lines to mysqld section of my.cnf(mysql Ver 14.14 Distrib 5.1.41, for debian-linux-gnu (i486) using readline 6.1)

server-id=2

master-host = 192.xxx.x.xxx
master-user = xyz
master-password = xyz_pass
master-connect-retry = 60

relay-log = /var/lib/mysql/slave-relay.log
relay-log-index = /var/lib/mysql/slave-relay-log.index

log-bin = /var/lib/mysql/mysql-bin.log
binlog-do-db = sample1
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
binlog-ignore-db=phpmyadmin

on first server slave status is

*************************** 1. row ***************************
Slave_IO_State: Connecting to master
Master_Host: 192.xxx.x.xx
Master_User: abc
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 36158
Relay_Log_File: slave-relay.000001
Relay_Log_Pos: 98
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: No
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 36158
Relay_Log_Space: 98
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
1 row in set (0.00 sec)

ERROR:
No query specified

On second server slave status is

*************************** 1. row ***************************
Slave_IO_State: Connecting to master
Master_Host: 192.xxx.x.xxx
Master_User: xyz
Master_Port: 3306
Connect_Retry: 60
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: slave-relay.000003
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 5
Exec_Master_Log_Pos: 0
Relay_Log_Space: 106
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 1045
Last_IO_Error: error connecting to master ‘abc@192.xxx.x.xxx:3306′ – retry-time: 60 retries: 86400
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)

ERROR:
No query specified

Do’nt know why Slave_IO_Running is no.

i have tried a lot to start replication but i am still unable to start replication.
i have also commented
#bind-address = 127.0.0.1
and
#skip-external-locking

i need your help. Please send your suggestions and solution for this problem.

Thanks in advance.

regards,
pradeep

By: hernan

hernan — Fri, 24 Oct 2008 16:34:14 +0000

I have a master-master replication, and change a table and a field in an master but I jenera error and comunication is almost loss.

can you help me, how I can do to add another field to a table without losing comunication

By: MySQL Replication Series: How does MySQL replication works? | Technology: Learn and Share

Thu, 17 Apr 2008 16:01:07 +0000

By: Log Buffer #87: a Carnival of the Vanities for DBAs

Log Buffer #87: a Carnival of the Vanities for DBAs — Fri, 07 Mar 2008 17:48:13 +0000

[...] offers answers to the question, how do you set up master-master replication in MySQL?, laying out the basics of this [...]

By: Michael S Moody

Michael S Moody — Mon, 03 Mar 2008 14:10:23 +0000

I generally find it better to do auto-increment = 10, instead of odd/evens like this, in case I need to swap in another master with a different server-id on a regular basis. This gives me 10-19 as possibiliets for id’s, vs just even/odd.

Michael

By: CrazyToon

CrazyToon — Sat, 01 Mar 2008 09:50:30 +0000

Karsten,

Good catch. Thats what I get for copying pasting It has been corrected.

By: Karsten Thygesen

Karsten Thygesen — Sat, 01 Mar 2008 09:24:49 +0000

I believe, that the server-id should be different in the two master setup’s. One should have server-id=1 and the other server-id=2 or something similar.

But thanks for a nice roundup!

Karsten