4/1/2023 0 Comments Ssh proxy awsNow you should be able to connect to any machine matching one of the host patterns and it will automatically and transparently look up and use the bastion host. You will likely want to adjust *. and SSHBastion to match your environment. Prox圜ommand ssh -A ec2 describe-instances -filters "Name=instance-state-name,Values=running" "Name=tag:Name,Values= SSHBastion" "Name=tag:Subnet,Values=public" | jq -r. Now all we need to do is incorporate that command in place of the bastion host address in the ssh configuration: Host *. If that fails, make sure that all the requirements mentioned above have been met. That command should return a public address of the bastion host, such as: You will likely wish to replace the bolded “SSHBastion” with whatever tag value you wish to use. "Name=instance-state-name,Values=running" Now, to test that we can get the relevant bastion host’s address, let’s run a simple command and verify that we get the correct result (lines broken for readability, but this is one long command): aws ec2 describe-instances -filters Basically, anything that can consume JSON, search for specific subkeys, and return the relevant values will work. It’s possible to use one of a number of other utilities for that same purpose.The command line utility jq must be installed.You could also have various bastion servers in the same AWS environment, but you will need to be able to map the destination machines (via DNS or IP range in a way that can be put in the Host line of the SSH configuration) to the relevant EC2 tag.In this example, we have a machine with the tag Name with a value of SSHBastion.You must be able to SSH into this machine, since it will be the bastion server. That EC2 instance must be on a public subnet that you have access to. There need to be a single EC2 instance in each target AWS environment with a unique tag, so that we can search for that tag and get the address of that single EC2.
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