Home / server / Questions / 713183
In Process
stdout
Asked: 2015-08-11 13:24:23 +0800 CST

Tail an AWS CloudWatch Log Group

  • 772

I have a Log Group that includes several Log Streams (from several EC2 instances). Is there any way to simply "tail" the consolidated logs in the group? If I click "Search Events" that shows the consolidated logs but the button that jumps to the end of the logs is grayed out. I have to manually plug in the date and time. I also tried the aws cli, but aws logs get-log-events requires a single log stream name to be specified.

amazon-cloudwatch

3 Answers

    • 9

  2. This is now possible directly using AWS CLI v2. For example:

    aws logs tail --since 1d --follow /aws/lambda/my_func

    will tail and continuously watch CloudWatch logs from 1 day ago and forward into the future.

    More here: https://awscli.amazonaws.com/v2/documentation/api/latest/reference/logs/tail.html

    • 5

  3. I was really disappointed with awslogs and cloudwatch-logs-tail so I made my own tool called Saw that efficiently streams CloudWatch logs to the console (and colorizes the JSON output):

    You can install it on MacOS with:

    brew tap TylerBrock/saw
brew install saw

    It has a bunch of nice features like the ability to automatically expand (indent) the JSON output (try running the tool with --expand):

    saw watch my_log_group --expand

    Got a Lambda you want to see error logs for? No Problem:

    saw watch /aws/lambda/my_func --filter error

    Saw is great because the output is easily readable and you can stream logs from entire log group, not just a single stream in the group. Filtering and watching streams with a certain prefix is also just as easy!

    • 3