![]() With that config in place, we can now use ssh to "directly" connect to the target ~ $ ssh Using ProxyJump in ssh configBy defining the target server(s) in the local SSH config (on the SSH client) and adding the ProxyJump config option, we can directly define the jump host for the target ~ $ tail. The login on the jump server uses my own username "ck".īut instead of typing the jump host setting for every ssh connection, this can also be defined in the ssh (client) config. In the above example, I want to connect as "admin" user to the targetserver in the internal network. ![]() ![]() At least it was not known to me, having used SSH since at leastīy using this parameter, we can define the jump host in the same command as we connect to the target ~ $ ssh -J to Ubuntu 22.04.2 LTS (GNU/Linux 5.15.0-67-generic x86_64) J command-line flag to allow simplified indirection through a one orĪlthough many years have passed since this release, the ProxyJumpĬonfig option (or -J command line parameter) is not known to many SSH * ssh(1): Add a ProxyJump option and corresponding With the release of OpenSSH 7.3 in August 2016 a new feature was added: Wouldn't it be nice, if this ssh jumping would be handled automatically in the background? Using a Jump Server in the command The files first need to be transferred from the target server to the jump host and then from the jump host to the ssh client. # SSH connection from jump host to the target ssh this works, it always requires to first connect to the jumphost, enter the ssh connection settings to the target server, therefore doing twice the "work" of establishing a SSH connection.Īnother problem is doing file transfers using scp or sftp. # SSH connection to jump host (-A for SSH agent ~ $ ssh -A Identity added: /home/ck/.ssh/id_rsa (/home/ck/.ssh/id_rsa) This is how this looks in a practical way: To connect to the target server, there are two SSH connections necessary:Ģ) SSH connection from the jump host to the target serverīy using SSH key authentication and agent forwarding, the private key from the SSH client is used in the second SSH connection, too.
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