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Project: 0x14. MySQL

Overview

This project is part of the SE Foundations curriculum. It focuses on setting up a primary-replica infrastructure using MySQL.

Learning Objectives

At the end of this project, you are expected to be able to explain to anyone, without the help of Google:

  • What is the main role of a database
  • What is a database replica
  • What is the purpose of a database replica
  • Why database backups need to be stored in different physical locations
  • What operation should you regularly perform to make sure that your database backup strategy actually works

Requirements

  • Allowed editors: vi, vim, emacs
  • All your files will be interpreted on Ubuntu 16.04 LTS
  • All your files should end with a new line
  • A README.md file, at the root of the folder of the project, is mandatory
  • All your Bash script files must be executable
  • Your Bash script must pass Shellcheck (version 0.3.7-5~ubuntu16.04.1 via apt-get) without any error
  • The first line of all your Bash scripts should be exactly #!/usr/bin/env bash
  • The second line of all your Bash scripts should be a comment explaining what is the script doing

Tasks

Task 0: Install MySQL

First things first, let’s get MySQL installed on both your web-01 and web-02 servers.

  • MySQL distribution must be 5.7.x
  • Make sure that task #3 of your SSH project is completed for web-01 and web-02. The checker will connect to your servers to check MySQL status
  • Please make sure you have your README.md pushed to GitHub.

Task 1: Let us in!

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 which will allow the checker access to them.

  • Create a MySQL user named holberton_user on both web-01 and web-02 with the host name set to localhost and the password projectcorrection280hbtn. This will allow us to access the replication status on both servers.
  • Make sure that holberton_user has permission to check the primary/replica status of your databases.
  • In addition to that, make sure that task #3 of your SSH project is completed for web-01 and web-02. You will likely need to add the public key to web-02 as you only added it to web-01 for this project. The checker will connect to your servers to check MySQL status

Task 2: If only you could see what I've seen with your eyes

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.

  • Create a database named tyrell_corp.
  • Within the tyrell_corp database create a table named nexus6 and add at least one entry to it.
  • Make sure that holberton_user has SELECT permissions on your table so that we can check that the table exists and is not empty.

Task 3: Quite an experience to live in fear, isn't it?

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.

  • The name of the new user should be replica_user, with the host name set to %, and can have whatever password you’d like.
  • replica_user must have the appropriate permissions to replicate your primary MySQL server.
  • holberton_user will need SELECT privileges on the mysql.user table in order to check that replica_user was created with the correct permissions.

Task 4: 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

Requirements:

  • MySQL primary must be hosted on web-01 - do not use the bind-address, just comment out this parameter
  • MySQL replica must be hosted on web-02
  • Setup replication for the MySQL database named tyrell_corp
  • Provide your MySQL primary configuration as answer file(my.cnf or mysqld.cnf) with the name 4-mysql_configuration_primary
  • Provide your MySQL replica configuration as an answer file with the name 4-mysql_configuration_replica

Tips:

  • Once MySQL replication is setup, add a new record in your table via MySQL on web-01 and check if the record has been replicated in MySQL web-02. 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.

Task 5: MySQL backup

What if the data center where both your primary and replica database servers are hosted are down because of a power outage or even worse: flooding, fire? Then all your data would inaccessible or lost. That’s why you want to backup and store them in a different system in another physical location. This can be achieved by dumping your MySQL data, compressing them and storing them in a different data center.

Write a Bash script that generates a MySQL dump and creates a compressed archive out of it.

Requirements:

  • The MySQL dump must contain all your MySQL databases
  • The MySQL dump must be named backup.sql
  • The MySQL dump file has to be compressed to a tar.gz archive
  • This archive must have the following name format: day-month-year.tar.gz
  • The user to connect to the MySQL database must be root
  • The Bash script accepts one argument that is the password used to connect to the MySQL database

Copyright

You are tasked to come up with solutions for the tasks below yourself to meet with the above learning objectives. You will not be able to meet the objectives of this or any following project by copying and pasting someone else’s work. You are not allowed to publish any content of this project. Any form of plagiarism is strictly forbidden and will result in removal from the program.

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