EC2 Instance is stuck, can't ssh in and abnormal CPU & network utilisation

I have 2 very small applications running in docker containers on a t2micro instance. The CPU usage is minimal but since last month I experienced that the applications were not responding due the ec2 instance being stuck.

The Instance reachability check failed and I can't ssh in to the instance, it just hangs.

Shutting down & starting the instance solves the problem but the issue happens in the next 3-7 days.

Does anybody has any idea?

CPU -> https://imgur.com/YXiSeml

Network -> https://imgur.com/dSZZduU

주제

컴퓨팅

태그

아마존 EC2

언어

English

AWS-User-5101457

질문됨 3년 전2.1천회 조회

2개 답변

최신
최다 투표
가장 많은 댓글

이 답변이 도움이 되었나요?커뮤니티가 여러분의 지식을 활용할 수 있도록 정답을 찬성하세요.

You mention this is a t2.micro when you run into issues have you checked your CPU credit balance via the monitoring tab for the EC2 instance? This sounds like you are consuming credits faster than they are accruing. The graph you linked shows a spike in CPU utilization which more than likely accounts for the credits being consumed.

RoB

답변함 3년 전

rrp
3년 전
I checked the logs in cat /var/log/auth.log and everything points that its due an attack.

Continuously and several times per second there are authentication attempts from several locations. China, US, Singapur ... They don't apply to the use case of my application since the application does not expect requests from there

the requests try to authenticate with default usernames like "test", "root", "ubuntu", "oracle", "postgres", "ansible" It seems the attack comes in a DoS shape ... Currently my instance is publicly reachable, What would you recommend?

How about fail2ban to prevent login attempts?

Yuxiang

답변함 3년 전

EC2 Instance is stuck, can't ssh in and abnormal CPU & network utilisation

관련 콘텐츠