You were correct, I had the key in the wrong region. Now the instance comes up and I am able to SSH into it. However I don't see a mounted volume. How can we identify what went wrong?
If you're able to SSH into your instance but don't see a mounted volume, there are several steps you can take to troubleshoot the issue. Here’s a guide to help you identify what went wrong:

### 1. **Check for Attached Volumes**

First, confirm whether the volume is actually attached to your instance.

- **AWS Management Console**:
  - Go to the EC2 Dashboard.
  - Click on "Instances" and select your instance.
  - Under the "Description" tab, look for the "Block devices" section to see if the volume is listed.

- **CLI**:
  You can use the AWS CLI to describe the instance and check the attached volumes:
  ```bash
  aws ec2 describe-instances --instance-ids <instance-id>
  ```

### 2. **Check Volume State**

If the volume is attached, check its state:

- Go to the "Volumes" section in the EC2 Dashboard.
- Ensure the volume is in the "in-use" state and is attached to your instance.

### 3. **Check File System**

If the volume is attached but not mounted, you may need to mount it manually. First, check if it is recognized by the operating system:

```bash
lsblk
```

This command will list all block devices. Look for your attached volume (e.g., `/dev/xvdf`, `/dev/sdf`, etc.).

### 4. **Mount the Volume**

If the volume
I'm glad to hear that the instance is up and running, and you can SSH into it.

Now, let's troubleshoot the missing mounted volume. Here are some steps to help us identify what went wrong:

1. **Check the instance's block device mapping**: Run the command `lsblk` or `blkid` to list the block devices attached to the instance. This will show you the device names, sizes, and types (e.g., `/dev/sda1`, `/dev/xvdf`, etc.). Look for the device that corresponds to the volume you created.
2. **Verify the volume is attached**: Check the AWS Management Console or use the AWS CLI command `aws ec2 describe-volumes --volume-ids <volume-id>` to ensure the volume is attached to the instance. Make sure the volume is in the "in-use" state and attached to the correct instance.
3. **Check the instance's system logs**: Run `sudo journalctl -u systemd` or `sudo dmesg` to view the system logs. Look for any error messages related to the volume or disk device.
4. **Check the fstab file**: Run `sudo cat /etc/fstab` to view the file system table. This file contains information about the file systems and their mount points. Look for an entry related to the volume you created.
5. **Check the mount command output**: Run `sudo mount` to see the current mount points and devices. Look