Similar to ForwardAgent, often it is needed to open a secondary SSH connection directly through a a first (or second) target. RELATED: What is SSH Agent Forwarding and How Do You Use It? ProxyJump There is a command, aptly named ForwardAgent, that allows you to “forward” your local keys to the next server in the hop by setting up SSH agent key forwarding. What if you have a scenario where you have opened an SSH connection to a target server, which then needs to make another SSH connection to a second server from that original target server? You might think that you will need to store those same SSH keys on that target server to make this next hop. Often this will lead to a “ Too many authentication failures for user myuser” on the target server if there are a lot of identities. By default, SSH will walk through and try every identity file until it finds the right one. This will tell SSH to not try every identity file within that folder, but only the one’s defined. Second, we have defined a tag named IdentitiesOnly. First, we need to tell SSH where the key file is, in this case we have stored the file in the. The IdentityFile and the IdentitiesOnly commands. There are two new commands that we have introduced here. How do we tell our host configuration to use this file? Host my-ssh-host This tutorial is not going into how to create those, so let’s assume that a set already exists and is properly setup. Instead of a password that can be hacked or guessed, it’s necessary to actually obtain the key file. These are the preferred way to setup an SSH connection. Almost every SSH tutorial or setup guide out there will usually reference public/private keys at one point or another.
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