Questo tutorial spiega come impostare e configurare la replica multi-master MySQL su Oracle Linux. Come forse già saprete, MySQL è un noto prodotto di database di prim'ordine che ha dimostrato di essere pronto per le aziende. Poiché i dati sono fondamentali per ogni organizzazione, la maggior parte degli amministratori di database è alla ricerca di una soluzione adatta per configurare l'alta disponibilità per garantire che gli utenti possano accedere ai propri dati 24 ore su 24, 7 giorni su 7. La replica di MySQL è una soluzione in grado di garantire criteri di disponibilità elevata. Inoltre, la replica MySQL è anche in grado di aiutare gli amministratori di database a distribuire il carico su più server di database bilanciando il carico delle richieste READ e WRITE. Sfortunatamente, la replica di base può offrire vantaggi solo sulle richieste READ. Per questo motivo, è stata introdotta la replica multi-master MySQL per offrire la replica anche per la richiesta WRITE.
1. Nota preliminare
Per questo tutorial, sto usando Oracle Linux 6.8 nella versione a 32 bit. Tieni presente che anche se la configurazione viene eseguita in Oracle Linux, i passaggi e la configurazione sono principalmente gli stessi per CentOS e Red Hat Linux. In questo tutorial utilizzeremo 2 server. Su ciascuno di essi, configureremo un database MySQL e lo configureremo per la replica multi-master. Alla fine di questo tutorial, vedremo che qualsiasi richiesta READ o WRITE incluse le richieste DDL (Data Definition Language) e DML (Data Manipulation Language) verrà eseguita su entrambi i server.
2. Fase di installazione
Per la fase di installazione, richiediamo solo il pacchetto del server MySQL per la fase di configurazione e il client MySQL per accedere all'ambiente del database. Entrambi i pacchetti richiedono l'installazione di alcune dipendenze. Per prima cosa, confermiamo la versione del nostro Sistema Operativo e annotiamo l'indirizzo IP per la preconfigurazione.
[[email protected] ~]# lsb_release -a
LSB Version: :base-4.0-ia32:base-4.0-noarch:core-4.0-ia32:core-4.0-noarch:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: OracleServer
Description: Oracle Linux Server release 6.8
Release: 6.8
Codename: n/a
[[email protected] ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 08:00:27:42:C0:4C
inet addr:192.168.43.11 Bcast:192.168.43.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe42:c04c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:544 errors:0 dropped:0 overruns:0 frame:0
TX packets:79 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:51274 (50.0 KiB) TX bytes:9474 (9.2 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:240 (240.0 b) TX bytes:240 (240.0 b)
Ora fai lo stesso sull'altro server.
[[email protected] ~]# lsb_release -a
LSB Version: :base-4.0-ia32:base-4.0-noarch:core-4.0-ia32:core-4.0-noarch:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: OracleServer
Description: Oracle Linux Server release 6.8
Release: 6.8
Codename: n/a
[[email protected] ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 09:00:30:42:C1:5D
inet addr:192.168.43.12 Bcast:192.168.43.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe42:c04c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:544 errors:0 dropped:0 overruns:0 frame:0
TX packets:79 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:51274 (50.0 KiB) TX bytes:9474 (9.2 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:240 (240.0 b) TX bytes:240 (240.0 b)
Quindi aggiungi l'indirizzo IP al file hosts del server. Fai lo stesso su entrambi i server come di seguito.
[[email protected] ~]# vi /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.43.11 DB1
192.168.43.12 DB2
Successivamente, configurerò un nuovo repository per installare il server MySQL e i pacchetti client MySQL tramite l'utilità yum. Per favore, fallo su ENTRAMBI i server.
[[email protected] ~]# cd /etc/yum.repos.d/
[[email protected] yum.repos.d]# ls
OEL6.repo
[[email protected] yum.repos.d]# wget http://repo.mysql.com/mysql-community-release-el6-5.noarch.rpm
--2017-05-22 09:43:59-- http://repo.mysql.com/mysql-community-release-el6-5.noarch.rpm
Resolving repo.mysql.com... 23.8.231.210
Connecting to repo.mysql.com|23.8.231.210|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5824 (5.7K) [application/x-redhat-package-manager]
Saving to: "mysql-community-release-el6-5.noarch.rpm"
100%[==================================================>] 5,824 --.-K/s in 0s
2017-05-22 09:44:00 (264 MB/s) - "mysql-community-release-el6-5.noarch.rpm" saved [5824/5824]
[[email protected] yum.repos.d]# ls
OEL6.repo mysql-community-release-el6-5.noarch.rpm
[[email protected] yum.repos.d]# rpm -Uvh mysql-community-release-el6-5.noarch.rpm
Preparing... ########################################### [100%]
1:mysql-community-release########################################### [100%]
[[email protected] yum.repos.d]# ls
CentOS.repo mysql-community.repo
mysql-community-release-el6-5.noarch.rpm mysql-community-source.repo
È stato installato il nuovo repository per l'ultima versione di MySQL. Abilitiamoli.
[[email protected] yum.repos.d]# vi mysql-community.repo
# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Una volta fatto, assicuriamoci che i pacchetti MySQL siano disponibili.
[[email protected] yum.repos.d]# rpm -qa|grep -i mysql
mysql-community-release-el6-5.noarch
Ottimo, ora abbiamo fatto metà. Poiché nessun pacchetto MySQL è installato nel server corrente, avviamo l'installazione del pacchetto. Di seguito sono riportati i passaggi.
[[email protected] yum.repos.d]#
[[email protected] yum.repos.d]# yum install mysql-server mysql-client
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Repository 'OEL' is missing name in configuration, using id
Determining fastest mirrors
epel/metalink | 6.2 kB 00:00
* epel: epel.mirror.angkasa.id
* remi-php56: remi.mirror.wearetriple.com
* remi-safe: remi.mirror.wearetriple.com
OEL | 3.7 kB 00:00
epel | 4.3 kB 00:00
epel/primary_db | 5.9 MB 00:00
mysql-connectors-community | 2.5 kB 00:00
mysql-connectors-community/primary_db | 15 kB 00:00
mysql-tools-community | 2.5 kB 00:00
mysql-tools-community/primary_db | 35 kB 00:00
mysql56-community | 2.5 kB 00:00
mysql56-community/primary_db | 183 kB 00:00
remi-php56 | 2.9 kB 00:00
remi-php56/primary_db | 218 kB 00:01
remi-safe | 2.9 kB 00:00
remi-safe/primary_db | 725 kB 00:02
Package mysql-server is obsoleted by mysql-community-server, trying to install mysql-community-server-5.6.36-2.el6.i686 instead
No package mysql-client available.
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.i686 0:5.6.36-2.el6 will be installed
--> Processing Dependency: mysql-community-common(i686) = 5.6.36-2.el6 for package: mysql-community-server-5.6.36-2.el6.i686
--> Processing Dependency: mysql-community-client(i686) >= 5.6.10 for package: mysql-community-server-5.6.36-2.el6.i686
--> Processing Dependency: perl(DBI) for package: mysql-community-server-5.6.36-2.el6.i686
--> Running transaction check
---> Package mysql-community-client.i686 0:5.6.36-2.el6 will be installed
--> Processing Dependency: mysql-community-libs(i686) >= 5.6.10 for package: mysql-community-client-5.6.36-2.el6.i686
---> Package mysql-community-common.i686 0:5.6.36-2.el6 will be installed
---> Package perl-DBI.i686 0:1.609-4.el6 will be installed
--> Running transaction check
---> Package mysql-community-libs.i686 0:5.6.36-2.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
============================================================================================
Package Arch Version Repository Size
============================================================================================
Installing:
mysql-community-server i686 5.6.36-2.el6 mysql56-community 55 M
Installing for dependencies:
mysql-community-client i686 5.6.36-2.el6 mysql56-community 18 M
mysql-community-common i686 5.6.36-2.el6 mysql56-community 308 k
mysql-community-libs i686 5.6.36-2.el6 mysql56-community 1.9 M
perl-DBI i686 1.609-4.el6 CentOS 705 k
Transaction Summary
============================================================================================
Install 5 Package(s)
Total download size: 76 M
Installed size: 338 M
Is this ok [y/N]: y
Downloading Packages:
(1/5): mysql-community-client-5.6.36-2.el6.i686.rpm | 18 MB 00:01
(2/5): mysql-community-common-5.6.36-2.el6.i686.rpm | 308 kB 00:00
(3/5): mysql-community-libs-5.6.36-2.el6.i686.rpm | 1.9 MB 00:00
(4/5): mysql-community-server-5.6.36-2.el6.i686.rpm | 55 MB 00:02
(5/5): perl-DBI-1.609-4.el6.i686.rpm | 705 kB 00:00
--------------------------------------------------------------------------------------------
Total 18 MB/s | 76 MB 00:04
warning: rpmts_HdrFromFdno: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Retrieving key from file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Importing GPG key 0x5072E1F5:
Userid : MySQL Release Engineering <[email protected]>
Package: mysql-community-release-el6-5.noarch (installed)
From : file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Installing : mysql-community-common-5.6.36-2.el6.i686 1/5
Installing : mysql-community-libs-5.6.36-2.el6.i686 2/5
Installing : mysql-community-client-5.6.36-2.el6.i686 3/5
Installing : perl-DBI-1.609-4.el6.i686 4/5
Installing : mysql-community-server-5.6.36-2.el6.i686 5/5
Verifying : perl-DBI-1.609-4.el6.i686 1/5
Verifying : mysql-community-server-5.6.36-2.el6.i686 2/5
Verifying : mysql-community-libs-5.6.36-2.el6.i686 3/5
Verifying : mysql-community-common-5.6.36-2.el6.i686 4/5
Verifying : mysql-community-client-5.6.36-2.el6.i686 5/5
Installed:
mysql-community-server.i686 0:5.6.36-2.el6
Dependency Installed:
mysql-community-client.i686 0:5.6.36-2.el6 mysql-community-common.i686 0:5.6.36-2.el6
mysql-community-libs.i686 0:5.6.36-2.el6 perl-DBI.i686 0:1.609-4.el6
Complete!
Ottimo, ora l'installazione è terminata. Avvia il demone MySQL per la prima volta.
[[email protected] yum.repos.d]# service mysqld restart
Stopping mysqld: [ OK ]
Initializing MySQL database: 2017-05-22 09:55:53 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2017-05-22 09:55:53 0 [Note] Ignoring --secure-file-priv value as server is running with --bootstrap.
2017-05-22 09:55:53 0 [Note] /usr/sbin/mysqld (mysqld 5.6.36) starting as process 18645 ...
2017-05-22 09:55:53 18645 [Note] InnoDB: Using atomics to ref count buffer pool pages
2017-05-22 09:55:53 18645 [Note] InnoDB: The InnoDB memory heap is disabled
2017-05-22 09:55:53 18645 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2017-05-22 09:55:53 18645 [Note] InnoDB: Memory barrier is not used
2017-05-22 09:55:53 18645 [Note] InnoDB: Compressed tables use zlib 1.2.3
2017-05-22 09:55:53 18645 [Note] InnoDB: Using Linux native AIO
2017-05-22 09:55:53 18645 [Note] InnoDB: Using CPU crc32 instructions
2017-05-22 09:55:53 18645 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2017-05-22 09:55:53 18645 [Note] InnoDB: Completed initialization of buffer pool
2017-05-22 09:55:53 18645 [Note] InnoDB: The first specified data file ./ibdata1 did not exist: a new database to be created!
2017-05-22 09:55:53 18645 [Note] InnoDB: Setting file ./ibdata1 size to 12 MB
2017-05-22 09:55:53 18645 [Note] InnoDB: Database physically writes the file full: wait...
2017-05-22 09:55:53 18645 [Note] InnoDB: Setting log file ./ib_logfile101 size to 48 MB
2017-05-22 09:55:53 18645 [Note] InnoDB: Setting log file ./ib_logfile1 size to 48 MB
2017-05-22 09:55:53 18645 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0
2017-05-22 09:55:53 18645 [Warning] InnoDB: New log files created, LSN=45781
2017-05-22 09:55:53 18645 [Note] InnoDB: Doublewrite buffer not found: creating new
2017-05-22 09:55:53 18645 [Note] InnoDB: Doublewrite buffer created
2017-05-22 09:55:53 18645 [Note] InnoDB: 128 rollback segment(s) are active.
2017-05-22 09:55:53 18645 [Warning] InnoDB: Creating foreign key constraint system tables.
2017-05-22 09:55:53 18645 [Note] InnoDB: Foreign key constraint system tables created
2017-05-22 09:55:53 18645 [Note] InnoDB: Creating tablespace and datafile system tables.
2017-05-22 09:55:53 18645 [Note] InnoDB: Tablespace and datafile system tables created.
2017-05-22 09:55:53 18645 [Note] InnoDB: Waiting for purge to start
2017-05-22 09:55:53 18645 [Note] InnoDB: 5.6.36 started; log sequence number 0
2017-05-22 09:55:54 18645 [Note] Binlog end
2017-05-22 09:55:54 18645 [Note] InnoDB: FTS optimize thread exiting.
2017-05-22 09:55:54 18645 [Note] InnoDB: Starting shutdown...
2017-05-22 09:55:55 18645 [Note] InnoDB: Shutdown completed; log sequence number 1625977
2017-05-22 09:55:55 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2017-05-22 09:55:55 0 [Note] Ignoring --secure-file-priv value as server is running with --bootstrap.
2017-05-22 09:55:55 0 [Note] /usr/sbin/mysqld (mysqld 5.6.36) starting as process 18667 ...
2017-05-22 09:55:55 18667 [Note] InnoDB: Using atomics to ref count buffer pool pages
2017-05-22 09:55:55 18667 [Note] InnoDB: The InnoDB memory heap is disabled
2017-05-22 09:55:55 18667 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2017-05-22 09:55:55 18667 [Note] InnoDB: Memory barrier is not used
2017-05-22 09:55:55 18667 [Note] InnoDB: Compressed tables use zlib 1.2.3
2017-05-22 09:55:55 18667 [Note] InnoDB: Using Linux native AIO
2017-05-22 09:55:55 18667 [Note] InnoDB: Using CPU crc32 instructions
2017-05-22 09:55:55 18667 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2017-05-22 09:55:55 18667 [Note] InnoDB: Completed initialization of buffer pool
2017-05-22 09:55:55 18667 [Note] InnoDB: Highest supported file format is Barracuda.
2017-05-22 09:55:55 18667 [Note] InnoDB: 128 rollback segment(s) are active.
2017-05-22 09:55:55 18667 [Note] InnoDB: Waiting for purge to start
2017-05-22 09:55:55 18667 [Note] InnoDB: 5.6.36 started; log sequence number 1625977
2017-05-22 09:55:55 18667 [Note] Binlog end
2017-05-22 09:55:55 18667 [Note] InnoDB: FTS optimize thread exiting.
2017-05-22 09:55:55 18667 [Note] InnoDB: Starting shutdown...
2017-05-22 09:55:57 18667 [Note] InnoDB: Shutdown completed; log sequence number 1625987
PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:
/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h vdevknime1 password 'new-password'
Alternatively you can run:
/usr/bin/mysql_secure_installation
which will also give you the option of removing the test
databases and anonymous user created by default. This is
strongly recommended for production servers.
See the manual for more instructions.
Please report any problems at http://bugs.mysql.com/
The latest information about MySQL is available on the web at
http://www.mysql.com
Support MySQL by buying support/licenses at http://shop.mysql.com
Note: new default config file not created.
Please make sure your config file is current
WARNING: Default config file /etc/my.cnf exists on the system
This file will be read by default by the MySQL server
If you do not want to use this, either remove it, or use the
#NAME?
[ OK ]
Starting mysqld: [ OK ]
Ottimo, ora il nostro servizio server MySQL è attivo. Confermiamolo elencando la porta utilizzata dal servizio MySQL. Per impostazione predefinita, MySQL utilizzerà la porta 3306 all'avvio del servizio. Di seguito i comandi:
[[email protected] yum.repos.d]# netstat -apn|grep -i mysql
tcp 0 0 :::3306 :::* LISTEN 2139/mysqld
unix 2 [ ACC ] STREAM LISTENING 16018 2139/mysqld /var/lib/mysql/mysql.sock
Ora, impostiamo una password iniziale per l'utente root di MySQL per assicurarci di non perdere la sicurezza di base per il nostro server MySQL.
[[email protected] yum.repos.d]# mysqladmin -u root password "Pass1234"
Warning: Using a password on the command line interface can be insecure.
[[email protected] yum.repos.d]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.6.36 MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select user();
+----------------+
| user() |
+----------------+
| [email protected] |
+----------------+
1 row in set (0.00 sec)
Conclusa la fase di installazione. Passiamo alla configurazione della configurazione della replica multi-master.
3. Fase di configurazione
Entriamo nel file di configurazione MySQL my.cnf e apportiamo le modifiche come di seguito sul server DB1.
[[email protected] ~]# vi /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=3306
innodb_file_per_table=ON
pid-file=/var/lib/mysql/mysqld.pid
server-id = 11
log_bin = /var/log/mysql/mysql-bin.log
binlog_do_db = test_rep
Di seguito la spiegazione per la configurazione:
- id-server ==> L'ID replica
- log_bin ==> Il file di registro da utilizzare per l'attività di replica
- binlog_do_db ==> Il database correlato al processo di replica
Una volta fatto, entriamo nell'ambiente del server MySQL e creiamo il relativo database e assegniamo un utente per il processo di replica.
[[email protected] ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.6.36-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.01 sec)
mysql> create database test_rep;
Query OK, 1 row affected (0.01 sec)
mysql> create user 'replicator'@'DB2' identified by 'Rep1234';
Query OK, 0 rows affected (0.01 sec)
mysql> grant replication slave on *.* to 'replicator'@'DB2';
Query OK, 0 rows affected (0.00 sec)
Fatto, ora riavvia il server MySQL e verifica se la configurazione è stata attivata o meno. Di seguito sono riportati i passaggi:
[[email protected] yum.repos.d]# service mysqld restart
Stopping mysqld: [ OK ]
Starting mysqld: [ OK ]
[[email protected] ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.6.36-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show master status;
+-------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 854 | test_rep | | |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
Eccellente, ora configuriamo il server DB2 come server slave per il master di replica DB1 e, inoltre, configuriamo il server DB2 anche come master per il server DB1. Di seguito sono riportati i passaggi:
[[email protected] ~]# vi /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=3306
innodb_file_per_table=ON
pid-file=/var/lib/mysql/mysqld.pid
server-id = 12
log_bin = /var/log/mysql/mysql-bin.log
binlog_do_db = test_rep
Come per la configurazione in DB1, entriamo nell'ambiente del server MySQL e creiamo il relativo database e assegniamo un utente per il processo di replica.
[[email protected] ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.6.36-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.01 sec)
mysql> create database test_rep;
Query OK, 1 row affected (0.01 sec)
mysql> create user 'replicator'@'DB1' identified by 'Rep1234';
Query OK, 0 rows affected (0.01 sec)
mysql> grant replication slave on *.* to 'replicator'@'DB1';
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status;
Empty set (0.01 sec)
Fatto, ora riavviamo il server DB2 MySQL e vediamo se la configurazione è stata attivata o meno. Se sì, continuiamo a procedere con la creazione dello slave per il server DB1.
[[email protected] ~]# service mysqld restart
Stopping mysqld: [ OK ]
Starting mysqld: [ OK ]
[[email protected] ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.6.36-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show master status;
+-------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 553 | test_rep | | |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> CHANGE MASTER TO MASTER_HOST = 'DB1', MASTER_PORT = 3306, MASTER_USER = 'replicator', MASTER_PASSWORD = 'Rep1234', MASTER_LOG_FILE = 'mysql-bin.000001', MASTER_LOG_POS = 854;
Query OK, 0 rows affected, 2 warnings (0.07 sec)
mysql> start slave;
Query OK, 0 rows affected (0.04 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: DB1
Master_User: replicator
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 854
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 284
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
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: 854
Relay_Log_Space: 459
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: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 11
Master_UUID: 6e143d91-3635-11e7-b9ad-08002742c04c
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)
ERROR:
No query specified
mysql> show slave status;
+----------------------------------+---------------+-------------+-------------+---------------+-------------------+---------------------+--------------------------+---------------+-----------------------+------------------+-------------------+-----------
| Slave_IO_State | Master_Host | Master_User | Master_Port | Connect_Retry | Master_Log_File | Read_Master_Log_Pos | Relay_Log_File | Relay_Log_Pos | Relay_Master_Log_File | Slave_IO_Running | Slave_SQL_Running | Replicate_Do_DB | Replicate_Ignore_DB | Replicate_Do_Table | Replicate_Ignore_Table | Replicate_Wild_Do_Table | Replicate_Wild_Ignore_Table | Last_Errno | Last_Error | Skip_Counter | Exec_Master_Log_Pos | Relay_Log_Space | Until_Condition | Until_Log_File | Until_Log_Pos | Master_SSL_Allowed | Master_SSL_CA_File | Master_SSL_CA_Path | Master_SSL_Cert | Master_SSL_Cipher | Master_SSL_Key | Seconds_Behind_Master | Master_SSL_Verify_Server_Cert | Last_IO_Errno | Last_IO_Error | Last_SQL_Errno | Last_SQL_Error | Replicate_Ignore_Server_Ids | Master_Server_Id | Master_UUID | Master_Info_File | SQL_Delay | SQL_Remaining_Delay | Slave_SQL_Running_State | Master_Retry_Count | Master_Bind | Last_IO_Error_Timestamp | Last_SQL_Error_Timestamp | Master_SSL_Crl | Master_SSL_Crlpath | Retrieved_Gtid_Set | Executed_Gtid_Set | Auto_Position |
+----------------------------------+---------------+-------------+-------------+---------------+-------------------+---------------------+--------------------------+---------------+-----------------------+------------------+-------------------+-----------
| Waiting for master to send event | DB1 | replicator | 3306 | 60 | mysql-bin.000001 | 854 | mysqld-relay-bin.000002 | 284 | mysql-bin.000001 | Yes | Yes | | | | | | | 0 | | 0 | 854 | 459 | None | | 0 | No | | | | | | 0 | No | 0 | | 0 | | | 11 | 6e143d91-3635-11e7-b9ad-08002742c04c | /var/lib/mysql/master.info | 0 | NULL | Slave has read all relay log; waiting for the slave I/O thread to update it | 86400 | | | | | | | | 0 |
+----------------------------------+---------------+-------------+-------------+---------------+-------------------+---------------------+--------------------------+---------------+-----------------------+------------------+-------------------+-----------
1 row in set (0.00 sec)
Grande! Poiché tutto è stato configurato per il server DB2, torna al server DB1 ed esegui la configurazione slave per il server DB2.
[[email protected] ~]# mysql -u root -p
Enter password:
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 11
Server version: 5.6.36-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show master status;
+-------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 854 | test_rep | | |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.01 sec)
mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> CHANGE MASTER TO MASTER_HOST = 'DB2', MASTER_PORT = 3306, MASTER_USER = 'replicator', MASTER_PASSWORD = 'Rep1234', MASTER_LOG_FILE = 'mysql-bin.000001', MASTER_LOG_POS = 553;
Query OK, 0 rows affected, 2 warnings (0.25 sec)
mysql> start slave;
Query OK, 0 rows affected (0.03 sec)
mysql> show slave status;
+----------------------------------+---------------+-------------+-------------+---------------+-------------------+---------------------+--------------------------+---------------+-----------------------+------------------+-------------------+-----------
| Slave_IO_State | Master_Host | Master_User | Master_Port | Connect_Retry | Master_Log_File | Read_Master_Log_Pos | Relay_Log_File | Relay_Log_Pos | Relay_Master_Log_File | Slave_IO_Running | Slave_SQL_Running | Replicate_Do_DB | Replicate_Ignore_DB | Replicate_Do_Table | Replicate_Ignore_Table | Replicate_Wild_Do_Table | Replicate_Wild_Ignore_Table | Last_Errno | Last_Error | Skip_Counter | Exec_Master_Log_Pos | Relay_Log_Space | Until_Condition | Until_Log_File | Until_Log_Pos | Master_SSL_Allowed | Master_SSL_CA_File | Master_SSL_CA_Path | Master_SSL_Cert | Master_SSL_Cipher | Master_SSL_Key | Seconds_Behind_Master | Master_SSL_Verify_Server_Cert | Last_IO_Errno | Last_IO_Error | Last_SQL_Errno | Last_SQL_Error | Replicate_Ignore_Server_Ids | Master_Server_Id | Master_UUID | Master_Info_File | SQL_Delay | SQL_Remaining_Delay | Slave_SQL_Running_State | Master_Retry_Count | Master_Bind | Last_IO_Error_Timestamp | Last_SQL_Error_Timestamp | Master_SSL_Crl | Master_SSL_Crlpath | Retrieved_Gtid_Set | Executed_Gtid_Set | Auto_Position |
+----------------------------------+---------------+-------------+-------------+---------------+-------------------+---------------------+--------------------------+---------------+-----------------------+------------------+-------------------+-----------
| Waiting for master to send event | DB2 | replicator | 3306 | 60 | mysql-bin.000001 | 553 | mysqld-relay-bin.000002 | 284 | mysql-bin.000001 | Yes | Yes | | | | | | | 0 | | 0 | 553 | 459 | None | | 0 | No | | | | | | 0 | No | 0 | | 0 | | | 12 | 14f5ab41-3c7b-11e7-a293-08002742c04c | /var/lib/mysql/master.info | 0 | NULL | Slave has read all relay log; waiting for the slave I/O thread to update it | 86400 | | | | | | | | 0 |
+----------------------------------+---------------+-------------+-------------+---------------+-------------------+---------------------+--------------------------+---------------+-----------------------+------------------+-------------------+-----------
1 row in set (0.01 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: DB2
Master_User: replicator
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 553
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 284
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
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: 553
Relay_Log_Space: 459
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: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 12
Master_UUID: 14f5ab41-3c7b-11e7-a293-08002742c04c
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)
ERROR:
No query specified
Nicely done, now as everything is ready in place, let's proceed with the testing phase to conclude all configuration was made correctly.
4. Testing Phase
Before we start the test, let's make the assumptions for the final result expectations. For this test, we will create a table on DB1 MySQL server then on DB2 we will check if the table automatically exists or not. If yes then we will add a new data row into it and check again in DB1 server if new data is available on both servers.
[[email protected] ~]# mysql -u root -p test_rep
Enter password:
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.6.36-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select database();
+------------+
| database() |
+------------+
| test_rep |
+------------+
1 row in set (0.00 sec)
mysql> create table tbl1( id int(11) primary key auto_increment, fullname varchar(30));
Query OK, 0 rows affected (0.22 sec)
mysql> show tables in test_rep;
+--------------------+
| Tables_in_test_rep |
+--------------------+
| tbl1 |
+--------------------+
1 row in set (0.01 sec)
Done, as the table creation is a DDL (Data Definition Language) statement, there's no need to enter a commit command. Now let's go inside DB2 MySQL server and see if the newly table created exists.
[[email protected] ~]# mysql -u root -p test_rep
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 5.6.36-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show tables in test_rep;
+--------------------+
| Tables_in_test_rep |
+--------------------+
| tbl1 |
+--------------------+
1 row in set (0.00 sec)
mysql> insert into tbl1 ( fullname ) values ('Shahril'), ('mark'), ('Allen'), ('Suzy'), ('Adam') ;
Query OK, 5 rows affected (0.05 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysql> select * from tbl1;
+----+----------+
| id | fullname |
+----+----------+
| 1 | Shahril |
| 2 | mark |
| 3 | Allen |
| 4 | Suzy |
| 5 | Adam |
+----+----------+
5 rows in set (0.00 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
Excellent, notice that the newly table created table in DB1 server now automatically exists in DB2 MySQL server. Then we also managed to insert 5 rows of data into the table. For the final check, let's see if the updated rows in table TBL1 can be seen in DB1 server as well.
[[email protected] ~]# mysql -u root -p test_rep
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 5.6.36-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select * from tbl1;
+----+----------+
| id | fullname |
+----+----------+
| 1 | Shahril |
| 2 | mark |
| 3 | Allen |
| 4 | Suzy |
| 5 | Adam |
+----+----------+
5 rows in set (0.01 sec)
mysql> delete from tbl1 where fullname like 'A%';
Query OK, 2 rows affected (0.07 sec)
mysql> select * from tbl1;
+----+----------+
| id | fullname |
+----+----------+
| 1 | Shahril |
| 2 | mark |
| 4 | Suzy |
+----+----------+
3 rows in set (0.00 sec)
Pollice su! We've successfully created a MySQL multi-master replication between 2 servers.