Ansible error due to GMP package version on Centos6 - centos

Question

I have a Dockerfile that builds an image based on CentOS (tag: centos6):
FROM centos
RUN rpm -iUvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
RUN yum update -y
RUN yum install ansible -y
ADD ./ansible /home/root/ansible
RUN cd /home/root/ansible;ansible-playbook -v -i hosts site.yml
Everything works fine until Docker hits the last line, then I get the following errors:
[WARNING]: The version of gmp you have installed has a known issue regarding
timing vulnerabilities when used with pycrypto. If possible, you should update
it (ie. yum update gmp).
PLAY [all] ********************************************************************
GATHERING FACTS ***************************************************************
Traceback (most recent call last):
File "/usr/bin/ansible-playbook", line 317, in <module>
sys.exit(main(sys.argv[1:]))
File "/usr/bin/ansible-playbook", line 257, in main
pb.run()
File "/usr/lib/python2.6/site-packages/ansible/playbook/__init__.py", line 319, in run
if not self._run_play(play):
File "/usr/lib/python2.6/site-packages/ansible/playbook/__init__.py", line 620, in _run_play
self._do_setup_step(play)
File "/usr/lib/python2.6/site-packages/ansible/playbook/__init__.py", line 565, in _do_setup_step
accelerate_port=play.accelerate_port,
File "/usr/lib/python2.6/site-packages/ansible/runner/__init__.py", line 204, in __init__
cmd = subprocess.Popen(['ssh','-o','ControlPersist'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
File "/usr/lib64/python2.6/subprocess.py", line 642, in __init__
errread, errwrite)
File "/usr/lib64/python2.6/subprocess.py", line 1234, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
Stderr from the command:
package epel-release-6-8.noarch is already installed
I imagine that the cause of the error is the gmp package not being up to date.
There is a related issue on GitHub: https://github.com/ansible/ansible/issues/6941
But there doesn't seem to be any solutions at the moment ...
Any ideas ?
Thanks in advance !
My site.yml playbook:
- hosts: all
pre_tasks:
- shell: echo 'hello'

Answer 1

Make sure that the files site.yml and hosts are present in the directory you're adding to /home/root/ansible.
Side note, you can simplify your Dockerfile by using WORKDIR:
WORKDIR /home/root/ansible
RUN ansible-playbook -v -i hosts site.yml