Log groups and log streams in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a log group in AWS CloudWatch Logs?

A log group is a container for log streams that share the same retention, monitoring, and access control settings. Think of it like a folder that holds related logs.

beginner

What is a log stream in AWS CloudWatch Logs?

A log stream is a sequence of log events from the same source, like a single file inside a folder. Each stream belongs to one log group.

beginner

How do log groups and log streams relate to each other?

Log groups contain multiple log streams. Each log stream holds logs from one source or instance, while the log group organizes these streams together.

intermediate

Why is it important to set retention policies on log groups?

Retention policies automatically delete old logs after a set time. This helps save storage space and control costs.

intermediate

Can multiple applications write to the same log group?

Yes, multiple applications can write to different log streams within the same log group, keeping their logs organized but separate.

What does a log stream represent in AWS CloudWatch Logs?

A A container for multiple log groups

B A dashboard for monitoring logs

C A policy to delete old logs

D A sequence of log events from a single source

A log stream is a sequence of log events from a single source, like one application or instance.

Where do you set retention policies for logs in AWS CloudWatch?

A On individual log events

B On log streams

C On log groups

D On AWS IAM roles

Retention policies are set on log groups to control how long logs are kept.

Can a log stream belong to multiple log groups?

A No, it belongs to only one log group

B Yes, it can belong to many log groups

C Only if the log group is deleted

D Only for AWS managed log streams

Each log stream belongs to exactly one log group.

What is the best way to organize logs from different applications?

A Use one log group with one log stream

B Use separate log groups for each application

C Write logs directly to S3 buckets

D Use one log stream for all applications

Using separate log groups for each application helps keep logs organized and easier to manage.

What happens if you do not set a retention policy on a log group?

A Logs are kept indefinitely

B Logs are archived automatically

C Logs are deleted immediately

D Logs are sent to another AWS account

Without a retention policy, logs are kept forever, which can increase storage costs.

Explain the difference between a log group and a log stream in AWS CloudWatch Logs.

Think of folders and files.

Describe why setting retention policies on log groups is important.

Consider storage and cost management.