问题
I've got a custom hardended RHEL 7.5 custom AMI. I want to use user data to complete some deploy time configuration. I've already ensured that /var/lib/cloud/* is removed before I create the AMI.
These are the contents of my user data:
echo "My script fired." >> /tmp/test.txt
echo "This line should produce an output log."
The file /tmp/test.txt is present, indicating the my script did indeed run. However, the expected result of the second statement is that a file /var/log/cloud-init-output.log should be produced in accordance with the AWS docs. This file is not present.
How do I make sure that user data produces the expected output log file?
回答1:
It appears that Red Hat felt the file was "completely unnecessary": https://bugzilla.redhat.com/show_bug.cgi?id=1424612
In order to view user data output, journalctl logs will need to be grepped:
sudo grep cloud-init /var/log/messages
来源：https://stackoverflow.com/questions/50255413/var-log-cloud-init-output-log-is-not-present-on-rhel-7-5