Difference between revisions of "MySQL Replication"
Line 121: | Line 121: | ||
/var/lib/mysql/mysql-bin.000005 | /var/lib/mysql/mysql-bin.000005 | ||
In ''/var/lib/mysql/'' we also have ''mysql-bin.000004'', so | In ''/var/lib/mysql/'' we also have file ''mysql-bin.000004'', so its' name is missing in index file, lets add it, so ''master-log-bin.index'' looks like: | ||
/var/lib/mysql/mysql-bin.000001 | /var/lib/mysql/mysql-bin.000001 |
Revision as of 23:34, 19 December 2007
Server 1 my.cnf
[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Default to using old password format for compatibility with mysql 3.x # clients (those using the mysqlclient10 compatibility package). old_passwords=1
bind-address = 0.0.0.0
binlog-do-db = mor server-id = 10 auto_increment_increment = 10 auto_increment_offset = 1 master-host = 111.111.111.111 master-user = rep1 master-password = rep1 master-port = 3306 master-connect-retry = 60 replicate-do-db = mor log-bin = /var/lib/mysql/mysql-bin.log log-bin-index = /var/lib/mysql/master-log-bin.index relay-log = /var/lib/mysql/slave-relay.log relay-log-index = /var/lib/mysql/slave-relay-log.index #slave-skip-errors=all
[mysql.server] user=mysql basedir=/var/lib
[mysqld_safe] log-error=/var/lib/mysql/mysqld.log pid-file=/var/run/mysqld/mysqld.pid
Server 2 my.cnf
[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Default to using old password format for compatibility with mysql 3.x # clients (those using the mysqlclient10 compatibility package). old_passwords=1
bind-address = 0.0.0.0
binlog-do-db = mor server-id = 20 auto_increment_increment = 20 auto_increment_offset = 2 master-host = 222.222.222.222 master-user = rep2 master-password = rep2 master-port = 3306 master-connect-retry = 60 replicate-do-db = mor log-bin = /var/lib/mysql/mysql-bin.log log-bin-index = /var/lib/mysql/master-log-bin.index relay-log = /var/lib/mysql/slave-relay.log relay-log-index = /var/lib/mysql/slave-relay-log.index #slave-skip-errors=all
[mysql.server] user=mysql basedir=/var/lib
[mysqld_safe] log-error=/var/lib/mysql/mysqld.log pid-file=/var/run/mysqld/mysqld.pid
Log files
In order for MySQL Replication to function properly you need to check log files in /var/lib/mysql
Open master-log-bin.index, it should contain names of the files which really exist in same folder. If there's some mismatch - edit this file: enter missing names for files or delete file names which does not represent real files in this folder.
Same with file slave-relay-log.index
Testing
Login to MySQL console on both servers:
mysql -u root -p
Then:
SHOW SLAVE STATUS\G
If everything is ok you should see such lines between others:
Slave_IO_State: Waiting for master to send event Slave_IO_Running: Yes
If Replication is off you will see:
Slave_IO_State: Slave_IO_Running: No
Troubleshooting
Check file: /var/lib/mysql/mysqld.log
[ERROR] Got fatal error 1236: 'Could not find first log file name in binary log index file' from master when reading data from binary log
We go to the master and check /var/lib/mysql/master-log-bin.index file.
For example it can show:
/var/lib/mysql/mysql-bin.000001 /var/lib/mysql/mysql-bin.000002 /var/lib/mysql/mysql-bin.000003 /var/lib/mysql/mysql-bin.000005
In /var/lib/mysql/ we also have file mysql-bin.000004, so its' name is missing in index file, lets add it, so master-log-bin.index looks like:
/var/lib/mysql/mysql-bin.000001 /var/lib/mysql/mysql-bin.000002 /var/lib/mysql/mysql-bin.000003 /var/lib/mysql/mysql-bin.000004 /var/lib/mysql/mysql-bin.000005
Restart mysql on this server and try with slave again.
This is just an example - some other files records can be missing (or not existing be in file). Make sure file has all related files which are in same folder.