SSH config: command for bastion server proxying

Host 51.21.21.11
  IdentityFile ~/.ssh/mykey.pem
  User ec2-user
  ForwardAgent yes

Host 10.*
  ProxyCommand ssh ec2-user@51.21.21.11 nc %h 22
  User ec2-user
  IdentityFile ~/.ssh/mykey.pem
  ForwardAgent yes

Put your ssh public key in ~/.ssh/authorized_keys along the path.

aws ec2 cli filter by tag name and value

1. aws ec2 describe-instances --filter Name=tag:Name,Values=ADS-prod-ads

The horrible syntax of "and" filters:

1.  aws ec2 describe-instances 
1. --filter 
1. '{"Name":"tag:backup","Values":["yes"]}' 
2. '{"Name":"instance-state-name","Values":["running"]}' 
2. non-breakout view below

aws ec2 describe-instances --filter '{"Name":"tag:backup","Values":["yes"]}' '{"Name":"instance-state-name","Values":["running"]}'