A Three-Tier Web Application Runs on Amazon EC2 Instances

question 497

Multiple Choice

A three-tier web application runs on Amazon EC2 instances. Cron daemons are used to trigger scripts that collect the web server, application, and database logs and send them to a centralized location every hour. Occasionally, scaling events or unplanned outages have caused the instances to stop before the latest logs were collected, and the log files were lost. Which of the following options is the MOST reliable way of collecting and preserving the log files?

• A) Update the cron jobs to run every 5 minutes instead of every hour to reduce the possibility of log messages being lost in an outage.
• B) Use Amazon CloudWatch Events to trigger Amazon Systems Manager Run Command to invoke the log collection scripts more frequently to reduce the possibility of log messages being lost in an outage.
• C) Use the Amazon CloudWatch Logs agent to stream log messages directly to CloudWatch Logs. Configure the agent with a batch count of 1 to reduce the possibility of log messages being lost in an outage.
• D) Use Amazon CloudWatch Events to trigger AWS Lambda to SSH into each running instance, and invoke the log collection scripts more frequently to reduce the possibility of log messages being lost in an outage.

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Definitions:

Imperfect Competition

Imperfect competition is a market structure where the conditions necessary for perfect competition are not met, leading to price and output decisions that are influenced by individual firms.

Efficient Market Outcomes

Refers to a scenario where market prices fully reflect all available information, leading to an optimal allocation of resources.

Monopolistic Competitive Industries

Industries characterized by many firms offering slightly differentiated products, where each has some degree of market power.

Market Power

The ability of a firm or group of firms to raise and maintain prices above the level that would prevail under competition.