Mysql cluster

Sissejuhatus

Probleem.

Vaja oleks hajutada mysql serveri koormust ja samal ajal suurendada töökindlust kogu süsteemil.

Lahendus oleks mysql_cluster.

MySQL Cluster combines the world's most popular open source database with a fault tolerant database clustering architecture so you can deliver mission-critical database applications with 99.999% availability.

Näites kasutame kolme serverit

management 192.168.1.10
node1      192.168.1.11
node2      192.168.1.12

install

gentoo

make.conf
use="cluster"

emerge mysql

freebsd

cd /usr/ports/databases/mysql50-server
make WITH_NDB=yes
make install WITH_NDB=yes

seadistamine

management

/etc/config.ini

# file "config.ini" - 2 data nodes and 2 SQL nodes
# This file is placed in the startup directory of ndb_mgmd (the
# management server)

[NDBD DEFAULT]
NoOfReplicas= 2
DataDir= /var/lib/mysql-cluster

[NDB_MGMD]
Hostname= 192.168.1.10
DataDir= /var/lib/mysql-cluster

[NDBD]
HostName= 192.168.1.11

[NDBD]
HostName= 192.168.1.12

[MYSQLD]
[MYSQLD]

ndb_mgmd --config-file=/etc/config.ini

FreeBSD's /usr/local/libexec/ndb_mgmd --config-file=/etc/config.ini

node 1

mysql_install
mkdir /var/lib/mysql-cluster
chown -R mysql:mysql /var/lib/mysql-cluster

/etc/mysql/my.cnf

freebsd serveris /usr/local/etc/my.cnf

[mysql_cluster]
ndb-connectstring=192.168.1.10

[mysqld]
ndbcluster
ndb-connectstring=192.168.1.10

ndbd --initial

mysqld_safe

freebsd puhul /usr/local/libexec/ndbd --initial mõlemas

NB! --initial võtit kasutada vaid esmakordsel startimisel. Edaspidi startida lihtsalt ndbd käsuga

node2

Kõik täiesti sama mis esimeses

mysql_install
mkdir /var/lib/mysql-cluster
chown -R mysql:mysql /var/lib/mysql-cluster

/etc/mysql/my.cnf

[mysql_cluster]
ndb-connectstring=192.168.1.10

[mysqld]
ndbcluster
ndb-connectstring=192.168.1.10

ndbd --initial

mysqld_safe

kasutamine

management

Käivitame järgneva käsu ja testime kas cluster töötab

localhost ~ # ndb_mgm
-- NDB Cluster -- Management Client --
ndb_mgm> show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     2 node(s)
id=2    @192.168.1.11  (Version: 5.0.44, Nodegroup: 0, Master)
id=3    @192.168.1.12  (Version: 5.0.45, Nodegroup: 0)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.1.10  (Version: 5.0.44)

[mysqld(API)]   2 node(s)
id=4    @192.168.1.11  (Version: 5.0.44)
id=5    @192.168.1.12  (Version: 5.0.45)

ndb_mgm>

Teeme testi

mysql
use test;
CREATE TABLE ctest (i INT) ENGINE=NDBCLUSTER;
INSERT INTO ctest () VALUES (1);
SELECT * FROM ctest;

Nagu märkasite kasutasin ENGINE=NDBCLUSTER

Engine: ndbcluster Support: YES Comment: Clustered, fault-tolerant, memory-based tables

Et toimiks mysql clustri kasutus tuleb igale tabelile see engine lisada. Et vaikimisi loodavatel tabelitel oleks kasutuses õige engine siis lisada my.cnf'i

default_storage_engine=NDBCLUSTER

Muide kogu mysql cluster on täiesti ilma paroolideta veel. Soovitav on ka need paika seada nüüd.

Lisalugemist

http://www.mysql.com/products/database/cluster/

http://mysql2.mirrors-r-us.net/doc/refman/5.0/en/mysql-cluster-config-example.html

http://onlinesolutionsmysql.blogspot.com/2007/05/q-webinar-part-4-mysql-cluster.html

Ja abivahendiks koormuse jagamisel

http://jan.kneschke.de/projects/mysql/mysql-proxy