Installing on RHEL/CentOS 6

[eljrax]

I think something's gone slightly awry with the introduction of version pinning, rax-autoscaler fails to execute when installed through pip on CentOS 6.

# cat Dockerfile
FROM centos:6
RUN yum -y install gcc python-setuptools python-devel
RUN easy_install pip
RUN pip install rax-autoscaler
RUN pip freeze | grep stevedore
RUN autoscale

Output:

# docker build -t rax-autoscaler-deps-6 .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM centos:6
 ---> a4281a4ea787
Step 2 : RUN yum -y install gcc python-setuptools python-devel
 ---> Using cache
 ---> 6b738b80f080
Step 3 : RUN easy_install pip
 ---> Using cache
 ---> 30e1b123d5fd
Step 4 : RUN pip install rax-autoscaler
 ---> Using cache
 ---> 9624d13a41fe
Step 5 : RUN pip freeze | grep stevedore
 ---> Running in 42a88daf5f71
DEPRECATION: Python 2.6 is no longer supported by the Python core team, please upgrade your Python. A future version of pip will drop support for Python 2.6
stevedore==1.10.0
 ---> bf1f05f10a34
Removing intermediate container 42a88daf5f71
Step 6 : RUN autoscale
 ---> Running in fc8b82e0d132
Traceback (most recent call last):
  File "/usr/bin/autoscale", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 2655, in <module>
    working_set.require(__requires__)
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 648, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 546, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: stevedore==1.10.0
The command '/bin/sh -c autoscale' returned a non-zero code: 1

When changing the Dockerfile to use centos:7, the process works.

pip freeze does report stevedore 1.10.0 as being installed, however.

[Teddy-Schmitz]

Investigating...

[Teddy-Schmitz]

So I found that if I upgrade pip and setuptools before installing it will work properly. I'm thinking its because its using very old versions that it causes an issue. Can you try and confirm?

[eljrax]

Hey,

Upgrading setuptools does allow an install, but it bails when executing then:

# cat Dockerfile
FROM centos:6
RUN yum -y install gcc python-setuptools python-devel
RUN easy_install pip
RUN pip install --upgrade setuptools
RUN pip install rax-autoscaler
RUN pip freeze | grep stevedore
RUN autoscale
# docker build -t rax-autoscaler-deps-6 .
Sending build context to Docker daemon 2.048 kB
Step 1 : FROM centos:6
 ---> a4281a4ea787
Step 2 : RUN yum -y install gcc python-setuptools python-devel
 ---> Using cache
 ---> 10a2e4fdcace
Step 3 : RUN easy_install pip
 ---> Using cache
 ---> c2136b6fb0ab
Step 4 : RUN pip install --upgrade setuptools
 ---> Using cache
 ---> e68d0475a605
Step 5 : RUN pip install rax-autoscaler
 ---> Using cache
 ---> 0a7dd1ab2988
Step 6 : RUN pip freeze | grep stevedore
 ---> Running in da74c858c932
DEPRECATION: Python 2.6 is no longer supported by the Python core team, please upgrade your Python. A future version of pip will drop support for Python 2.6
stevedore==1.10.0
 ---> 0a968dafe600
Removing intermediate container da74c858c932
Step 7 : RUN autoscale
 ---> Running in 160a792973dc
Traceback (most recent call last):
  File "/usr/bin/autoscale", line 9, in <module>
    load_entry_point('rax-autoscaler==0.4.0', 'console_scripts', 'autoscale')()
  File "/usr/lib/python2.6/site-packages/pkg_resources/__init__.py", line 549, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.6/site-packages/pkg_resources/__init__.py", line 2542, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.6/site-packages/pkg_resources/__init__.py", line 2202, in load
    return self.resolve()
  File "/usr/lib/python2.6/site-packages/pkg_resources/__init__.py", line 2208, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/lib/python2.6/site-packages/raxas/autoscale.py", line 27, in <module>
    from raxas import common
  File "/usr/lib/python2.6/site-packages/raxas/common.py", line 23, in <module>
    import pyrax
  File "/usr/lib/python2.6/site-packages/pyrax/__init__.py", line 59, in <module>
    from novaclient import client as nc
  File "/usr/lib/python2.6/site-packages/novaclient/client.py", line 34, in <module>
    from keystoneclient import adapter
  File "/usr/lib/python2.6/site-packages/keystoneclient/__init__.py", line 30, in <module>
    import importlib
ImportError: No module named importlib
The command '/bin/sh -c autoscale' returned a non-zero code: 1

So it looks like importlib for some reason isn't just a -dev requirement, it's actually required to execute autoscale on centos 6.

Should be sorted by PR #25

[Teddy-Schmitz]

Great I will fixup PR #25 merge it in and do a release soon.