Security Group

list all security groups	aws ec2 describe-security-groups
create a security group	aws ec2 create-security-group --vpc-id vpc-1a2b3c4d --group-name web-server --description "web server access"
list details about a securty group	aws ec2 describe-security-groups --group-id sg-0000000
open port 80 for everyone	aws ec2 authorize-security-group-ingress --group-id sg-0000000 --protocol tcp --port 80 --cidr 0.0.0.0
get my public ip	my_ip=$(dig +short myip.opendns.com @resolver1.opendns.com); echo $my_ip
open port 22 just for my ip	aws ec2 authorize-security-group-ingress --group-id sg-0000000 --protocol tcp --port 80 --cidr $my_ip/24
remove a firewall rule from a group	aws ec2 revoke-security-group-ingress --group-id sg-0000000 --protocol tcp --port 80 --cidr 0.0.0.0/24
delete a security group	aws ec2 delete-security-group --group-id sg-00000000

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