Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am trying to set up Open MPI between a few machines on out network. Open MPI works fine locally, but I just can't get it to work on a remote node. I can ssh into the remote machine (without password) just fine, but if I try something like

mpiexec -n 4 --host hello_c

then the ssh connection just times out.

I checked several tutorials but the only configuration instructions they give is "make sure you can ssh into the remote machine without a password". I did and I still can't launch nodes on remote machines. What's the problem?

share|improve this question

From the remote machine are you able to ssh to other machines and localhost without password? If not, you may not have copied over your private key. Are your systems running something like SELinux or AppArmor? For SELinux you can run 'setenforce 0' to disable it so you can test.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.