ssh: Could not resolve hostname -: Name or service not known(IP address)

Question

I tried this  
ssh - i /home/miki/Documents/jk/keys/aws/kjam/python-kjam.pem ubuntu@35.157.98.242  
ssh: Could not resolve hostname -: Name or service not known  
  
When I open session in AWS Systems Manager  
root@ip-172-31-40-194:~# ip addr show  
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000  
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00  
    inet 127.0.0.1/8 scope host lo  
       valid_lft forever preferred_lft forever  
    inet6 ::1/128 scope host  
       valid_lft forever preferred_lft forever  
2: eth0:  mtu 9001 qdisc fq_codel state UP group default qlen 1000  
    link/ether 06:8f:5c:fe:5a:c0 brd ff:ff:ff:ff:ff:ff  
    inet 172.31.40.194/20 brd 172.31.47.255 scope global dynamic eth0  
       valid_lft 2611sec preferred_lft 2611sec  
    inet6 fe80::48f:5cff:fefe:5ac0/64 scope link  
       valid_lft forever preferred_lft forever  
  
Why is the IP adress different? What is the username of my EC2 instance?

Answer

Hi,  
You need to use _username@PublicDNS_

```
ssh -i /path/my-key-pair.pem ec2-user@ec2-198-51-100-1.compute-1.amazonaws.com
```

If you click "Connect" from your EC2 dashboard, it will give you exactly what to enter in the terminal.  
  
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AccessingInstancesLinux.html

ssh: Could not resolve hostname -: Name or service not known(IP address)

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