EC2 instance is not registered in ECS cluster

Question

I created an ECS cluster for EC2 Linux + Networking, spot instance from web UI wizard. However, the instances never appear on the UI.
I double-checked roles and policies, and I believe every permission is granted.

In the instances, I found an error in the cloud-init log file `/var/log/cloud-init-output.log` saying:
```
/var/lib/cloud/instance/scripts/part-001: line 7: /etc/init/spot-instance-termination-notice-handler.conf: No such file or directory
```

The auto-generated user data is:
```
#!/bin/bash
echo ECS_CLUSTER=my-cluster >> /etc/ecs/ecs.config;echo ECS_BACKEND_HOST= >> /etc/ecs/ecs.config;
export PATH=/usr/local/bin:$PATH
yum -y install jq
yum install -y awscli
aws configure set default.region ap-northeast-1
cat < /etc/init/spot-instance-termination-notice-handler.conf
... 
```
I didn't modify the script and apparently, there is no such directory `/etc/init` in the latest AMI (amzn2-ami-ecs-gpu-hvm-2.0.20220831-x86_64-ebs)

Answer

the error is happening because the /etc/init directory does not exist in ec2. add a mkdir /etc/init before the cat < in your userdata. ``` #!/bin/bash echo ECS_CLUSTER=my-cluster >> /etc/ecs/ecs.config;echo ECS_BACKEND_HOST= >> /etc/ecs/ecs.config; export PATH=/usr/local/bin:$PATH yum -y install jq yum install -y awscli aws configure set default.region ap-northeast-1 **mkdir /etc/init** cat < /etc/init/spot-instance-termination-notice-handler.conf ```

EC2 instance is not registered in ECS cluster

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