EC2/EBS Command Reference Diagnostic Troubleshooter (Part 1)
Use the interactive troubleshooter below to identify your EC2/EBS command scenario, review the verbatim command, understand the trigger condition, and learn what it diagnoses or fixes.
🚨 Step 1: What specific error symptom are you experiencing?
Please click the most accurate description:
Quick Reference Table
| # | Command Category | Verbatim Command | When to Run | What It Does |
|---|---|---|---|---|
| 1 | diagnostic | sudo file -s /dev/xvdf | You need to determine whether there is a file system on an attached volume before mounting it. | Gets information about a specific device, such as its file system type. If the output simply shows data, there is no file system on the device. |
| 2 | diagnostic | sudo blkid | You want to configure an attached volume to mount automatically after reboot and need its device entry for the /etc/fstab file. | Finds the 128-bit universally unique identifier (UUID) of the device. By using the UUID instead of the device name, you reduce the chances that the system becomes unbootable after a hardware reconfiguration. |
| 3 | fix | sudo umount /data then sudo mount -a | You have added a new entry to /etc/fstab and need to verify that your entry works without errors. | Unmounts the device and then mounts all file systems in /etc/fstab. If there are no errors, the file is OK and your file system will mount automatically after it is rebooted. |
| 4 | pipeline | signed_message=$( echo -n $text_message | openssl dgst -sha256 ... ) | You are provisioning a publicly advertised BYOIP address range in AWS and need to create a cryptographically signed authorization message. | Signs the plaintext authorization message using the private key you created previously. |