AWS CloudWatch - 签名已过期

Question

I'm setting up CloudWatch for several of my EC2 instances, using AWS custom CloudWatch metrics .

Everything is going fine, except one of my instances gives me the below error:

ubuntu@my-host:~ $ /etc/aws-scripts-mon/mon-put-instance-data.pl --mem-util --disk-space-util --disk-path=/ --aws-credential-file=/etc/aws-scripts-mon/awscreds.template

ERROR: Failed to call CloudWatch: HTTP 400. Message: Signature expired: 20150515T204709Z is now earlier than 20150515T204917Z (20150515T205417Z - 5 min .)

For more information, run 'mon-put-instance-data.pl --help'

I've tried searching around the Internet, including this link , but no luck. Any ideas?

One hint: I have a cron job invoking this same command every 5 minutes. It is also unsuccessful. That may be related to the x - 5 min. message bit in the above error message.

Answer 1

The system time of the problem EC2 instance is off by several minutes. See AWS SDK Error - Signature not yet current

This is likely the solution!