[Planetlab-users] cpu freezes question

[Jay A. Patel]

Roger Pack wrote:
> 
>  > on a large number of PL nodes I get an SSH warning that the host
>  > identification has changed and thus all connections are refused. So I
>  > downloaded the latest known_hosts file from PLC, but the problem still
>  > persists.
>  >
>  > Does anyone know how to solve this?
> 
> 
> Also, as a note for the host key changing warning, one thing that 
> (apparently) seems to works is to put
> StrictHostKeyChecking no
> in ~/.ssh/config

No, that shouldn't work -- in and of itself.

SSH will refuse connections to nodes that have changed their SSH keys 
even with that setting. The setting is used to automatically add keys of 
nodes to which your workstation is performing a virgin join to. Virgin 
join is defined as a node for which does not exist in ~/.ssh/known_hosts 
file.

(1) use the ScrictHostKeyChecking setting you mentioned.
(2) Additionally, rm ~/.ssh/known_hosts prior to connecting to PL nodes

This is a somewhat non-advisable due to security issues. However, what 
the heck ...

Cheers,
Jay.