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keckcaves:ssh_to_node_problem

New account ssh problem

For the cave to work, the head node uses ssh to establish a connection with the render nodes. For new accounts and after some extensive operating system upgrades, each user needs to explicitly allow ssh connections with each render node. Otherwise, Vrui applications will fail. Currently, no errors are provided if this happens when starting an application from an icon. To check for and solve this problem, from the command line in a terminal window, first make sure that there aren't any zombie processes running by typing ListAllNodes. If processes are shown on the render nodes, type KillAllNodes. Then add the ssh permissions by typing:

>rm ~/.ssh/known_hosts
>OnRenderNodes uptime

or

>rm ~/.ssh/known_hosts
>for node in r1 r2 r3 r4 r5 ; do ssh -o StrictHostKeyChecking=no $node true ; done

If you use OnRenderNodes uptime, the computer will ask you “Are you sure you want to continue connecting (yes/no)?” Answer yes each time. Then you should be able to run applications again.

keckcaves/ssh_to_node_problem.txt · Last modified: 2010/07/11 17:12 by sumner