No firewall rules are defined, selinux is disabled. I can use ibping to ping between the machines and get replies. Still cannot create a ring. MPDs can start locally. Passworddless ssh works perfectly. Authentication is from the same NIS server as all the other nodes in the cluster that do work. It is an odd problem, IMHO!! Any more suggestions? Thanks,
Let's compare ssh versions! I'm using: [root@cluster1002 ~]$ ssh -V ssh: Reflection for Secure IT 184.108.40.206 (build 3005) on x86_64-redhat-linux-gnu (64-bit)
Could you check for mpd processes on both nodes? [root@cluster1002 ~] ps ux [root@claster1002 ~] ssh test2 -x ps ux If there is an mpd process please kill it.
[root@claster1002 ~] echo test1 > mpd.hosts [root@claster1002 ~] echo test2 >> mpd.hosts [root@claster1002 ~] mpdboot -r ssh -n 2 -d Check the ring: [root@claster1002 ~] mpdtrace If there is no ring, let's try to create it by hand:
[root@test1 ~] env I_MPI_JOB_TAGGED_PORT_OUTPUT=1 /opt/intel/impi/3.2.2.006/bin64/mpd.py --ncpus=1 --myhost=test1 -e -d -s 2 You'll get port number (port_number) which will be used in the next command