Ce tutoriel explique comment installer et configurer la réplication multi-maître MySQL sur Oracle Linux. Comme vous le savez peut-être tous déjà, MySQL est un produit de base de données de premier ordre bien connu qui s'est avéré être prêt pour l'entreprise. Les données étant cruciales pour chaque organisation, la plupart des administrateurs de bases de données recherchent une solution adaptée pour configurer la haute disponibilité afin de garantir que les utilisateurs puissent accéder à leurs données 24h/24 et 7j/7. La réplication MySQL est une solution qui peut garantir une politique de haute disponibilité. De plus, la réplication MySQL peut également aider les administrateurs de bases de données à répartir la charge sur plusieurs serveurs de bases de données en équilibrant la charge des requêtes READ et WRITE. Malheureusement, la réplication de base ne peut offrir des avantages que sur les requêtes READ. Pour cette raison, la réplication multi-maître MySQL a été introduite pour offrir également la réplication pour les requêtes WRITE.
1. Remarque préliminaire
Pour ce tutoriel, j'utilise Oracle Linux 6.8 dans la version 32 bits. Veuillez noter que même si la configuration est effectuée sous Oracle Linux, les étapes et la configuration sont principalement les mêmes pour CentOS et Red Hat Linux. Dans ce tutoriel, nous utiliserons 2 serveurs. Sur chacun d'eux, nous allons mettre en place une base de données MySQL et la configurer pour la réplication multi-maîtres. A la fin de ce tutoriel, nous verrons que toute requête READ ou WRITE incluant les requêtes DDL (Data Definition Language) et DML (Data Manipulation Language) sera exécutée sur les deux serveurs.
2. Phase d'installation
Pour la phase d'installation, nous n'avons besoin que du package de serveur MySQL pour la phase de configuration et du client MySQL pour accéder à l'environnement de base de données. Les deux packages nécessitent l'installation de certaines dépendances. Tout d'abord, confirmons la version de notre système d'exploitation et notons l'adresse IP pour la pré-configuration.
[[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)
Faites maintenant la même chose sur l'autre serveur.
[[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)
Ajoutez ensuite l'adresse IP au fichier hosts du serveur. Faites la même chose sur les deux serveurs comme ci-dessous.
[[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
Ensuite, je vais configurer un nouveau référentiel pour installer les packages du serveur MySQL et du client MySQL via l'utilitaire yum. Veuillez le faire sur les DEUX serveurs.
[[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
Le nouveau référentiel pour la dernière version de MySQL a été installé. Activons-les.
[[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
Une fois cela fait, assurons-nous que les packages MySQL sont disponibles.
[[email protected] yum.repos.d]# rpm -qa|grep -i mysql
mysql-community-release-el6-5.noarch
Super, maintenant nous avons fait la moitié du chemin. Comme aucun package MySQL n'est installé sur le serveur actuel, commençons l'installation du package. Voici les étapes.
[[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!
Parfait, maintenant l'installation est terminée. Démarrez le démon MySQL pour la première fois.
[[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 ]
Super, maintenant notre service de serveur MySQL est en place. Confirmons-le en listant le port utilisé par le service MySQL. Par défaut, MySQL utilisera le port 3306 lors du démarrage du service. Ci-dessous les commandes :
[[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
Maintenant, configurons un mot de passe initial pour l'utilisateur racine MySQL afin de nous assurer que nous ne manquons pas la sécurité de base de notre serveur 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)
Fini la phase d'installation. Passons à la configuration de la configuration de la réplication multi-maître.
3. Phase de configuration
Allons dans le fichier de configuration MySQL my.cnf et apportons les modifications comme ci-dessous sur le serveur 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
Ci-dessous l'explication de la configuration :
- server-id ==> L'ID de réplication
- log_bin ==> Le fichier journal à utiliser pour l'activité de réplication
- binlog_do_db ==> La base de données associée au processus de réplication
Une fois cela fait, allons dans l'environnement du serveur MySQL et créons la base de données associée et affectons un utilisateur pour le processus de réplication.
[[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)
Terminé, redémarrez maintenant le serveur MySQL et voyez si la configuration a été activée ou non. Voici les étapes :
[[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)
Excellent, configurons maintenant le serveur DB2 en tant que serveur esclave pour le maître de réplication DB1 et, en plus, configurons le serveur DB2 également en tant que maître pour le serveur DB1. Voici les étapes :
[[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
Identique à la configuration dans DB1, allons dans l'environnement du serveur MySQL et créons la base de données associée et affectons un utilisateur pour le processus de réplication.
[[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)
Terminé, redémarrons maintenant le serveur DB2 MySQL et voyons si la configuration a été activée ou non. Si oui, nous continuons à procéder à la création de l'esclave pour le serveur 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)
Génial! Comme tout a été configuré pour le serveur DB2, revenons au serveur DB1 et faisons la configuration esclave pour le serveur 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)
Thumbs up! We've successfully created a MySQL multi-master replication between 2 servers.