Project 0x14: MySQL: Relational Database Management System

0x14-mysql/4-mysql_configuration_primary

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+[mysqld]
+pid-file       = /var/run/mysqld/mysqld.pid
+socket         = /var/run/mysqld/mysqld.sock
+datadir        = /var/lib/mysql
+log-error      = /var/log/mysql/error.log
+symbolic-links = 0
+server-id      = 1
+log_bin        = /var/log/mysql/mysql-bin.log
+binlog_do_db   = tyrell_corp

0x14-mysql/4-mysql_configuration_replica

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+[mysqld]
+pid-file        = /var/run/mysqld/mysqld.pid
+socket          = /var/run/mysqld/mysqld.sock
+datadir         = /var/lib/mysql
+log-error       = /var/log/mysql/error.log
+symbolic-links  = 0
+server-id       = 2
+log_bin         = /var/log/mysql/mysql-bin.log
+relay_log       = /var/log/mysql/mysql-relay-bin
+binlog_do_db    = tyrell_corp

0x14-mysql/5-mysql_backup

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+#!/usr/bin/env bash
+# Generates a compressed archive of a MySQL dump.
+mysqldump -uroot -p"$1" --all-databases > backup.sql
+tar -cvzf "$(date +%d-%m-%Y)".tar.gz backup.sql

0x14-mysql/README.md

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+# MySQL: Relational Database Management System
+
+MySQL is a widely-used RDBMS known for its scalability, cross-platform compatibility, and robust features. As a key component of the LAMP stack, MySQL facilitates the efficient storage and retrieval of data through structured tables, supporting SQL for data manipulation.
+<br>
+## ![introduction to SQL](https://github.com/the1Riddle/alx-higher_level_programming/assets/125451537/af51da70-efc1-4e2d-9dd4-526cffcc2e65)
+
+MySQL is a popular choice for web development anging from small projects to large-scale enterprise applications and used in this project because:
+      1. It has a strong focus on security.
+      2. Ease of use.
+      3. Because of its thriving community.
+
+What's is the first thing you will want to do?
+--------------------------------------
+
+First things first, let’s get MySQL installed on your server: in this project two servers in used.
+<br>
+**Example:**
+```
+ubuntu@229-web-01:~$ mysql --version
+mysql  Ver 14.14 Distrib 5.7.25, for Linux (x86_64) using  EditLine wrapper
+ubuntu@229-web-01:~$
+```
+
+In order for us to verify that your servers are properly configured, we need you to create a user and password for both MySQL databases
+<br>
+**Example**
+```
+ubuntu@229-web-01:~$ mysql -uholberton_user -p -e "SHOW GRANTS FOR 'holberton_user'@'localhost'"
+Enter password:
++-----------------------------------------------------------------+
+| Grants for holberton_user@localhost                             |
++-----------------------------------------------------------------+
+| GRANT REPLICATION CLIENT ON *.* TO 'holberton_user'@'localhost' |
++-----------------------------------------------------------------+
+ubuntu@229-web-01:~$
+```
+
+In order for you to set up replication, you’ll need to have a database with at least one table and one row in your primary MySQL server (web-01) to replicate from.
+<br>
+**Example**
+```
+ubuntu@229-web-01:~$ mysql -uholberton_user -p -e "use tyrell_corp; select * from nexus6"
+Enter password:
++----+-------+
+| id | name  |
++----+-------+
+|  1 | Leon  |
++----+-------+
+ubuntu@229-web-01:~$
+```
+
+Before you get started with your primary-replica synchronization, you need one more thing in place. On your primary MySQL server (web-01), create a new user for the replica server.
+<br>
+**Example**
+```
+ubuntu@229-web-01:~$ mysql -uholberton_user -p -e 'SELECT user, Repl_slave_priv FROM mysql.user'
++------------------+-----------------+
+| user             | Repl_slave_priv |
++------------------+-----------------+
+| root             | Y               |
+| mysql.session    | N               |
+| mysql.sys        | N               |
+| debian-sys-maint | Y               |
+| holberton_user   | N               |
+| replica_user     | Y               |
++------------------+-----------------+
+ubuntu@229-web-01:~$
+```
+
+## Setup a Primary-Replica infrastructure using MySQL
+
+Having a replica member on for your MySQL database has 2 advantages:
+        - Redundancy: If you lose one of the database servers, you will still have another working one and a copy of your data
+        - Load distribution: You can split the read operations between the 2 servers, reducing the load on the primary member and improving query response speed
+
+What you need to do for this:
+-----------------------------
+
+1. Host primarily MySQL on your first server - do not use the bind-address, just comment out this parameter **(Must)**
+2. Host MySQL replica on your second server.
+3. Setup replication for the MySQL database named tyrell_corp
+
+> [!TIP]<br>
+> - Once MySQL replication is setup, add a new record in your table via MySQL on server 1 and check if the record has been replicated in MySQL server 2. If you see it, it means your replication is working!
+> - **Make sure that UFW is allowing connections on port 3306 (default MySQL port) otherwise replication will not work.**
+
+#### Example:
+
+<p align="center">**SERVER ONE**</p>
+
+```
+ubuntu@web-01:~$ mysql -uholberton_user -p
+Enter password:
+Welcome to the MySQL monitor.  Commands end with ; or \g.
+Your MySQL connection id is 1467
+Server version: 5.5.49-0ubuntu0.14.04.1-log (Ubuntu)
+
+Copyright (c) 2000, 2016, 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 |
++------------------+----------+--------------------+------------------+
+| mysql-bin.000009 |      107 | tyrell_corp          |                  |
++------------------+----------+--------------------+------------------+
+1 row in set (0.00 sec)
+
+mysql>
+```
+
+<p align="center">**SERVER TWO**</p>
+
+```
+root@web-02:/home/ubuntu# mysql -uholberton_user -p
+Enter password:
+Welcome to the MySQL monitor.  Commands end with ; or \g.
+Your MySQL connection id is 53
+Server version: 5.5.49-0ubuntu0.14.04.1-log (Ubuntu)
+
+Copyright (c) 2000, 2016, 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 slave status\G
+*************************** 1. row ***************************
+               Slave_IO_State: Waiting for master to send event
+                  Master_Host: 158.69.68.78
+                  Master_User: replica_user
+                  Master_Port: 3306
+                Connect_Retry: 60
+              Master_Log_File: mysql-bin.000009
+          Read_Master_Log_Pos: 107
+               Relay_Log_File: mysql-relay-bin.000022
+                Relay_Log_Pos: 253
+        Relay_Master_Log_File: mysql-bin.000009
+             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: 107
+              Relay_Log_Space: 452
+              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: 1
+1 row in set (0.00 sec)
+
+mysql>
+```
+
+**END**