EC2 Instance Freezes

Question

I am experiencing sudden freezes in one particular instance.
Here some details of the instance:
Type: t2.micro
Region/av. zone: us-west-2b
OS: amzn-ami-hvm-2018.03.0.20180811-x86_64-gp2 (ami-a0cfeed8)

My this Ec2 instance freezes automatically.
I have docker installed in the instance.
I am new in this field.
don't have an idea from where can I get system or server log that why my ec2 instance continuously freezing, so that I can trace the problem.
Thanks in Advance.

Solution 1

Couple of options:

1. Use a larger size, e.g. t2.small or t2.medium - if the freezing goes away it may be memory-related.

2. Examine CPU Credits usage - if it "freezes" when the CPU credits go low you're overloading the instance. Use a larger one.

3. Examine the OS logs - in /var/log/*. There may be some clues about memory or other problems.

4. Once it "freezes" go to EC2 -> Instances -> Actions -> Instance Settings -> Get System Log and see if you get any clues there.

Hope that helps :)

Solution 2

Mine runs out of memory causing the CPU to spike to 100% killing processes along the way (e.g. Apache / MySQL)

Login to console.aws.amazon.com, to view your EC2 logs

1. Select the instance
2. Choose "Actions > Monitor and Troubleshoot > Get Instance Screenshot"

Hope this helps.

Comments

[ceejayoz]

Chances are you're running out of CPU credits, as t2.micro is a "burstable" instance type. docs.aws.amazon.com/AWSEC2/latest/UserGuide/…

[Tim]

Could be EBS credits as well aws.amazon.com/blogs/database/…

[Appleoddity]

How do you know it’s freezing? Being it’s a virtual server, it takes a little more effort to determine if a server is “frozen.” Just wondering how you know?

[MLu]

Hi Ashok, if the response below answered your question please upvote and accept it. That's the ServerFault's way to say thank you for the time and effort someone took to help you. Thanks!

[Ashok Patel]

@Appleoddity I am accessing that using putty and putty console freezed.even when i tried to reconnect again, i am not able to connect so i thought that aws instance was freezed.

[Wilson Hauck]

View profile, Network profile for contact info and free downloadable Utility Scripts to assist with performance tuning - reduction of pauses.

[Ashok Patel]

thank you @mlu serverfault.com/users/122588/mlu

[Chau Giang]

Get System Log now is under Monitor and Troubleshoot menu