Your company is planning to set up a WordPress application.
The WordPress application will connect to a MySQL database.
Part of the requirement is to ensure that the database environment is fault-tolerant and highly available.
Which of the following options can help to fulfill this requirement?
Click on the arrows to vote for the correct answer
A. B. C. D.Answer - A.
One way to ensure high availability and fault-tolerant environments is to ensure Instances are located across multiple availability zones.
Hence, if you are hosting MySQL yourself, ensure that you have instances spread across multiple AZ's.
The AWS Documentation mentions the following about the multi-AZ feature.
Amazon RDS provides high availability and failover support for DB instances using Multi-AZ deployments.
Amazon RDS uses several different technologies to provide failover support.
Multi-AZ deployments for Oracle, PostgreSQL, MySQL, and MariaDB DB instances use Amazon's failover technology.
For more information on AWS Multi-AZ deployments, please visit the below URL:
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.MultiAZ.htmlTo fulfill the requirement of a fault-tolerant and highly available database environment for a WordPress application, we have the following options:
Option A: Create a MySQL RDS environment with the Multi-AZ feature enabled. This option involves setting up a MySQL RDS (Relational Database Service) environment on AWS with the Multi-AZ (Availability Zone) feature enabled. Multi-AZ means that AWS will automatically create a replica of the primary database instance in a different availability zone for redundancy. In the event of a failure of the primary instance or the availability zone, AWS will automatically failover to the standby instance in the secondary availability zone. This option ensures high availability and fault tolerance for the MySQL database environment.
Option B: Create a MySQL RDS environment and create a Read Replica. This option involves setting up a MySQL RDS environment on AWS and creating a Read Replica of the primary instance. A Read Replica is a copy of the primary database instance that can be used for read-only queries. In the event of a failure of the primary instance, the Read Replica can be promoted to become the new primary instance. This option provides high availability but may not be as fault-tolerant as Multi-AZ since it requires manual intervention to promote the Read Replica to become the new primary instance.
Option C: Create multiple EC2 instances in the same AZ. Host MySQL and enable replication via scripts between the instances. This option involves setting up multiple EC2 (Elastic Compute Cloud) instances on AWS in the same availability zone and hosting MySQL on these instances. Replication between the instances can be set up via scripts to ensure data consistency. While this option provides fault tolerance in the form of multiple instances, it may not provide high availability since a failure in the availability zone could affect all instances.
Option D: Create multiple EC2 instances in separate AZ's. Host MySQL and enable replication via scripts between the instances. This option involves setting up multiple EC2 instances on AWS in separate availability zones and hosting MySQL on these instances. Replication between the instances can be set up via scripts to ensure data consistency. This option provides both high availability and fault tolerance since a failure in one availability zone will not affect the instances in the other availability zones.
Therefore, the best option to fulfill the requirement of a fault-tolerant and highly available database environment for a WordPress application on AWS would be Option A: Create a MySQL RDS environment with the Multi-AZ feature enabled. This option provides both high availability and fault tolerance without requiring manual intervention in the event of a failure.