cloud engineer
This command lists the EC2 instance id and the tag name using query.
aws ec2 describe-instances \ --query 'Reservations[].Instances[].[InstanceId,Tags[?Key==Name]|[0].Value]' \ --profile tfc \ --region us-east-2 \ --output text |
aws ec2 describe-instances \ --query 'Reservations[].Instances[].[InstanceId,Tags[?Key==Name]|[0].Value]' \ --profile tfc \ --region us-east-2 \ --output text
Output:
i-xxxxxxxxxxxxxxxxx server-one i-xxxxxxxxxxxxxxxxx server-two i-xxxxxxxxxxxxxxxxx server-three |
i-xxxxxxxxxxxxxxxxx server-one i-xxxxxxxxxxxxxxxxx server-two i-xxxxxxxxxxxxxxxxx server-three
|[0].Value insures output is one instance record per line.
When changing machine types, you may be asked to enable the latest ENA driver for Enhanced Network Support on an Amazon EC2 instance. There are several instructions depending on the Linux OS flavor. Here are the instructions to enable. In some cases, you may need to rebuild the kernel module. To verify that the ena module is installed, use the modinfo command as shown in the following example.
modinfo ena |
modinfo ena
You also may have to enable the enhanced networking attribute on the instance.
aws ec2 modify-instance-attribute --instance-id instance_id --ena-support |
aws ec2 modify-instance-attribute --instance-id instance_id --ena-support
When you stand up an AWS instance, it’s only accessible via SSH key using the default user, typically ec2-user.
Add password to ec2-user, then enable password authentication to ‘yes’ in SSH.
# Add password to ec2-user sudo passwd ec2-user # edit ssh config vim /etc/ssh/sshd_config # enable password authentication PasswordAuthentication yes # save file and exit |
# Add password to ec2-user sudo passwd ec2-user # edit ssh config vim /etc/ssh/sshd_config # enable password authentication PasswordAuthentication yes # save file and exit
Restart SSH service.
systemctl restart sshd.service |
systemctl restart sshd.service