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Hello I work in a huge farm of servers (to me at least!) where I have up to 60 servers in one of my branches to connect to. You can ...
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- 03-22-2011 #1
- Join Date
- Feb 2005
Cluster like SSH client with hop definition capability
I work in a huge farm of servers (to me at least!) where I have up to 60 servers in one of my branches to connect to. You can not directly see these 60 servers, you have to login into a jump/hop server first and from that machine, you can see the 60 nodes to login to.
Because these nodes are the same, I installed Cluster SSH in the jump server, then I have to "ssh -X" into the jump server and then open terminal for all of them at once.
I was wondering if we have any kind of Cluster SSH like app that one can define a jump server (or even multiple jump servers) for. This way I didn't have to install anything on my jump machine.
- 03-22-2011 #2
One of my datacenters has a similar setup.
And even worse, I dont even have ssh, but only a http(s) proxy.
Sad story, donīt ask
Anyway, I do use "corkscrew" as a proxycomand to access these boxes, and it works stable.
For ssh, you need a slightly different approach, namely netcat.
I just googled the proxycommand, not actually tested it.
But it should get you started.
The rest of the .ssh/config snippet should be ok (copied and sanitized from my own)
- You need netcat on the gateway box, and in the $PATH of the connecting user.
"netcat" is "nc" on some distributions.
- authorized key setup helps a lot
- so does ssh-agent
On your client machine:
mkdir -p ~/.ssh/control-master Then edit ~/.ssh/config host *.<BRANCH_DOMAIN> ControlMaster auto ControlPath ~/.ssh/control-master/%r@%h:%p ProxyCommand ssh -e none <BRANCH_GATEWAY> exec netcat -w 30 %h %p host <BRANCH_NETWORK> # e.g.: 10.56.100.* ControlMaster auto ControlPath ~/.ssh/control-master/%r@%h:%p ProxyCommand ssh -e none <BRANCH_GATEWAY> exec netcat -w 30 %h %p host * ServerAliveInterval 10 ForwardAgent yes
Test if you can reach the branch machines with ssh by either
Once ssh works, clusterssh and parallel ssh should work as well.
ControlPath and ControlMaster will multiplex ssh connections through the first established one.
Means: You should see only one connection from your client machine to the branch gateway, even if you parallel-ssh into all 60 machines.
Last edited by Irithori; 03-22-2011 at 03:10 PM.You must always face the curtain with a bow.