Evaggelos Balaskas - System Engineer

[notes based on a docker centos5]

# cat /etc/redhat-release

CentOS release 5.11 (Final)

Setup Enviroment

Install compiler:

# yum -y install gcc make

Install zlib headers:

# yum -y install zlib-devel

Install tools:

# yum -y install curl unzip

SSL/TLS Errors

If you are on a CentOS 5x machine, when trying to download files from the internet, you will get this error msg:

This is a brown out of TLSv1 support. TLSv1 support is going away soon, upgrade to a TLSv1.2+ capable client.

or

SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version

that is because CentOS 5x has an old cipher suite that doesnt work with today’s standards.

OpenSSL

To bypass these SSL/TLS errors, we need to install a recent version of openssl.

# cd /root/

# curl -LO https://www.openssl.org/source/openssl-1.0.2o.tar.gz
# tar xf openssl*.tar.gz
# cd openssl*

# ./Configure shared linux-x86_64
# make
# make install

The output has a useful info:

OpenSSL shared libraries have been installed in:
  /usr/local/ssl

So, we have to update the system’s library paths, to include this one:

# echo "/usr/local/ssl/lib/" >> /etc/ld.so.conf
# /sbin/ldconfig

Python 2.7

Download the latest Python2.7

# cd /root/
# curl -LO https://www.python.org/ftp/python/2.7.14/Python-2.7.14.tgz
# tar xf Python*.tgz
# cd Python*

Install Python:

# ./configure --prefix=/opt/Python27 --enable-shared
# make
# make install

PATH

# export PATH=/opt/Python27/bin/:$PATH

# python -c "import ssl; print(ssl.OPENSSL_VERSION)"

OpenSSL 1.0.2o  27 Mar 2018

SetupTools

Download the latest setuptools

# cd /root/

# export PYTHONHTTPSVERIFY=0
# python -c 'import urllib; urllib.urlretrieve ("https://pypi.python.org/packages/72/c2/c09362ab29338413ab687b47dab03bab4a792e2bbb727a1eb5e0a88e3b86/setuptools-39.0.1.zip", "setuptools-39.0.1.zip")'

Install setuptools

# unzip setuptools*.zip
# cd setuptools*

# python2.7 setup.py build
# python2.7 setup.py install

PIP

Install PIP

# cd /root/

# easy_install pip

Searching for pip
Reading https://pypi.python.org/simple/pip/
Downloading https://pypi.python.org/packages/4b/5a/8544ae02a5bd28464e03af045e8aabde20a7b02db1911a9159328e1eb25a/pip-10.0.0b1-py2.py3-none-any.whl#md5=34dd54590477e79bc681d9ff96b9fd39
Best match: pip 10.0.0b1
Processing pip-10.0.0b1-py2.py3-none-any.whl
Installing pip-10.0.0b1-py2.py3-none-any.whl to /opt/Python27/lib/python2.7/site-packages
writing requirements to /opt/Python27/lib/python2.7/site-packages/pip-10.0.0b1-py2.7.egg/EGG-INFO/requires.txt
Adding pip 10.0.0b1 to easy-install.pth file
Installing pip script to /opt/Python27/bin
Installing pip3.6 script to /opt/Python27/bin
Installing pip3 script to /opt/Python27/bin

Installed /opt/Python27/lib/python2.7/site-packages/pip-10.0.0b1-py2.7.egg
Processing dependencies for pip
Finished processing dependencies for pip

Ansible

Now, we are ready to install ansible

# pip install ansible

Collecting ansible

/opt/Python27/lib/python2.7/site-packages/pip-10.0.0b1-py2.7.egg/pip/_vendor/urllib3/util/ssl_.py:339: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
  SNIMissingWarning
  Using cached ansible-2.5.0-py2.py3-none-any.whl
Collecting paramiko (from ansible)
  Using cached paramiko-2.4.1-py2.py3-none-any.whl
Collecting cryptography (from ansible)
  Using cached cryptography-2.2.2-cp27-cp27m-manylinux1_x86_64.whl
Requirement already satisfied: setuptools in /opt/Python27/lib/python2.7/site-packages/setuptools-39.0.1-py2.7.egg (from ansible) (39.0.1)
Collecting PyYAML (from ansible)
  Using cached PyYAML-3.12.tar.gz
Collecting jinja2 (from ansible)
  Using cached Jinja2-2.10-py2.py3-none-any.whl
Collecting pyasn1>=0.1.7 (from paramiko->ansible)
  Using cached pyasn1-0.4.2-py2.py3-none-any.whl
Collecting bcrypt>=3.1.3 (from paramiko->ansible)
  Using cached bcrypt-3.1.4-cp27-cp27m-manylinux1_x86_64.whl
Collecting pynacl>=1.0.1 (from paramiko->ansible)
  Using cached PyNaCl-1.2.1-cp27-cp27m-manylinux1_x86_64.whl
Collecting six>=1.4.1 (from cryptography->ansible)
  Using cached six-1.11.0-py2.py3-none-any.whl
Collecting cffi>=1.7; platform_python_implementation != "PyPy" (from cryptography->ansible)
  Using cached cffi-1.11.5-cp27-cp27m-manylinux1_x86_64.whl
Collecting enum34; python_version < "3" (from cryptography->ansible)
  Using cached enum34-1.1.6-py2-none-any.whl
Collecting asn1crypto>=0.21.0 (from cryptography->ansible)
  Using cached asn1crypto-0.24.0-py2.py3-none-any.whl
Collecting idna>=2.1 (from cryptography->ansible)
  Using cached idna-2.6-py2.py3-none-any.whl
Collecting ipaddress; python_version < "3" (from cryptography->ansible)
  Using cached ipaddress-1.0.19.tar.gz
Collecting MarkupSafe>=0.23 (from jinja2->ansible)
  Using cached MarkupSafe-1.0.tar.gz
Collecting pycparser (from cffi>=1.7; platform_python_implementation != "PyPy"->cryptography->ansible)
  Using cached pycparser-2.18.tar.gz
Installing collected packages: pyasn1, six, pycparser, cffi, bcrypt, enum34, asn1crypto, idna, ipaddress, cryptography, pynacl, paramiko, PyYAML, MarkupSafe, jinja2, ansible
  Running setup.py install for pycparser ... done
  Running setup.py install for ipaddress ... done
  Running setup.py install for PyYAML ... done
  Running setup.py install for MarkupSafe ... done

Successfully installed MarkupSafe-1.0 PyYAML-3.12 ansible-2.5.0 asn1crypto-0.24.0 bcrypt-3.1.4 cffi-1.11.5 cryptography-2.2.2 enum34-1.1.6 idna-2.6 ipaddress-1.0.19 jinja2-2.10 paramiko-2.4.1 pyasn1-0.4.2 pycparser-2.18 pynacl-1.2.1 six-1.11.0

Version

# ansible --version

ansible 2.5.0
  config file = None
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /opt/Python27/lib/python2.7/site-packages/ansible
  executable location = /opt/Python27/bin/ansible
  python version = 2.7.14 (default, Mar 31 2018, 20:00:21) [GCC 4.1.2 20080704 (Red Hat 4.1.2-55)]

Ansible v2

# ansible -m ping localhost

localhost | SUCCESS => {
    "changed": false,
    "ping": "pong"
}

Ansible v1

or a previous version for testing

eg. 1.9.6

# pip install 'ansible==1.9.6'

# ansible --version

ansible 1.9.6
  configured module search path = None

# yum -y install python-simplejson

# ansible localhost -c local -m ping -i "localhost,"

localhost | success >> {
    "changed": false,
    "ping": "pong"
}

Possible Building Error

When building python from source, setup.py will try to look for /usr/local/ssl/ directory to find the libraries and included headers of openssl. Althouth it works from _ssl.c , it doesnt for _hashlib.c.

To fix this problem, you must manual edit the Python-2.7.14/setup.py

 869                 ssl_incs += ['/usr/local/ssl/include']
 870                 ssl_libs += ['/usr/local/ssl/lib']

the full code is:

 865         if have_any_openssl:
 866             if have_usable_openssl:
 867                 # The _hashlib module wraps optimized implementations
 868                 # of hash functions from the OpenSSL library.
 869                 ssl_incs += ['/usr/local/ssl/include']
 870                 ssl_libs += ['/usr/local/ssl/lib']
 871                 exts.append( Extension('_hashlib', ['_hashopenssl.c'],
 872                                        include_dirs = ssl_incs,
 873                                        library_dirs = ssl_libs,
 874                                        libraries = ['ssl', 'crypto']) )
 875             else:
 876                 print ("warning: openssl 0x%08x is too old for _hashlib" %
 877                        openssl_ver)
 878                 missing.append('_hashlib')

hope that helps!