Vincent, I now use a slightly different workaround. Instead of routing known_hosts to /dev/null I route it to a temp file. This keeps the EC2 noise out of my default known_hosts file, and seems to play well with ansible.
>From my ~/.ssh/config file: Host *.amazonaws.com PasswordAuthentication no StrictHostKeyChecking no UserKnownHostsFile /tmp/ec2_known_hosts User ec2-user Hope that helps you. -- Mike On Monday, September 29, 2014 8:37:43 AM UTC-7, Vincent Janelle wrote: > > Exactly like what was described at the start of this thread. :( Setting > the environment variable produces the desired parallel execution. > -- You received this message because you are subscribed to the Google Groups "Ansible Project" group. To unsubscribe from this group and stop receiving emails from it, send an email to ansible-project+unsubscr...@googlegroups.com. To post to this group, send email to ansible-project@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/550bdafe-2892-477b-9452-bbed389bfbce%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.