Trying to do a couple things. I have 2 jump hosts I can use to get into my cluster login node. From my laptop to the jump hosts is password. From jump hosts to login node can be key-based, so if I do it all from CLI:
[me@home ~]$ ssh user@jump1
Password:
[user@jump1 ~]$ ssh user@login1
[user@login1 ~]$
Same process if I use jump2.
So first thing I’m trying to do is set up my ~/.ssh/config to use the ProxyJump host and key file to get to login1. I have the following:
Host jump1
Hostname jump1.domain
Host jump2
Hostname jump2.domain
Host login1
Hostname login1.cluster
ProxyJump jump1
#ProxyJump jump2
I’m not sure how to configure the IdentityFile entries for each jump host. The user on the jump hosts has different id_rsa keys in ~/.ssh, but both are in the authorized_keys file on login1.
Second thing I’m trying to do is join or start a tmux session. From CLI, I can run:
tmux has-session -t mysession || tmux new -s mysession && tmux a -t mysession
I’ve learned that to just join a running session (tmux a -t mysession), I need to include “RequestTTY yes” in my ssh config entry for login1. What I can’t get working is the conditional statement that will fire up a new tmux session if it doesn’t already exist.
To join or create a session in tmux try: tmux new -As mysession. The -A makes new attach to a session if it already exists.
Using a proxyjump host in ssh doesn’t quite work like that. It effectively logs into the jump host, then forwards a port to the target server and logs you in via that. So you need to put the public key from your machine in the authorized_keys file on both the jump hosts (jump1 and jump2) and the target server (login1).
Let me know if that’s not clear, I’m not sure I interpreted your question correctly.
this is a lot of text, but the important part, an error message, is missing.
