A few of the users on our server have run into issues where, when running MPI jobs, they get an error message from mpdboot. The message states that the connection is refused.
mpdboot_compute-0-12.local (handle_mpd_output 905): from mpd on compute-0-11, invalid port info: connect to address 10.1.255.208 port 544: Connection refused connect to address 10.1.255.208 port 544: Connection refused
The problem was that Rock Linux was prompting for a password when the user tried to log into the compute nodes. There is a simple solution to this problem; setup passwordless ssh to the nodes.
However, you don’t need to follow the usual method of enabling password ssh. On Rocks Linux since the “authorized_keys” file and other files in .ssh are automatically copied to the compute nodes, you just need to run the following command:
ssh-agent $SHELL ssh-add
If you are still prompted for a password when attempting to login to the compute nodes, try removing the files in your .ssh folder (~/.ssh) and re-running the ssh-agent and ssh-add commands.
[…] up passwordless logins to all of my accounts on remote machines. I recently made a post describing how to enable passwordless SSH to compute nodes, however what if you are attempting to enable passwordless logins to remote […]
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