Instance Status Checks and Autorecovery

Question 1

How mane status checks have EC2 instances?

Answer 1

System status checks and instance status checks

Question 2

What does a failure in the system status checks mean?

Answer 2

Failure of this check could indicate host SW or host HW problems of the EC2, loss of system power, loss of network connectivity.

Question 3

What does a failure in the instance status checks mean?

Answer 3

Specific to the file system or has a corrupted Kernel - corrupted file system, incorrect instance networking or OS kernel issues.

Question 4

What can you use to help instances in case something wrong goes on?

Answer 4

Autorecovery can kick in and help.

Question 5

Describe what autorecovery can do for you:

Answer 5

• Recover the instance: - can be a number of steps depending on the failure - even moving the instance to a new EC2 host within the AZ (EC2 is an AZ service), keeping all the network configuration and IPs…
• Stop this instance
• Terminate this instance - useful in a cluster
• Reboot this instance