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Troubleshooting EC2 User Data Execution (Cloud-Init)
August 2, 2026
Sysadmin Broadcast
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How to Verify Whether EC2 User Data Executed Successfully
When you launch an EC2 instance with User Data, AWS uses cloud-init to execute the script automatically during the first boot. Sometimes the application (e.g., Nginx, Apache, Docker) is not installed or configured as expected. In such cases, you need to verify whether the User Data script executed successfully, is still running, or failed.
# check cloud-init status :
This command shows whether the User Data execution is still running or has completed.
cloud-init status output : status: running
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