1 Ansible中使用ansible --version查看版本，报错信息如下：
ERROR! Unexpected Exception, this is probably a bug: (cryptography 0.8. (/usr/lib64/python2./site-packages), Requirement.parse('cryptography>=1.1'))
the full traceback was:
Traceback (most recent call last):
File "/usr/bin/ansible", line , in <module>
mycli = getattr(__import__("ansible.cli.%s" % sub, fromlist=[myclass]), myclass)
File "/usr/lib/python2.7/site-packages/ansible/cli/__init__.py", line , in <module>
from ansible.inventory.manager import InventoryManager
File "/usr/lib/python2.7/site-packages/ansible/inventory/manager.py", line , in <module>
from ansible.plugins.loader import inventory_loader
File "/usr/lib/python2.7/site-packages/ansible/plugins/loader.py", line , in <module>
from ansible.parsing.utils.yaml import from_yaml
File "/usr/lib/python2.7/site-packages/ansible/parsing/utils/yaml.py", line , in <module>
from ansible.parsing.yaml.loader import AnsibleLoader
File "/usr/lib/python2.7/site-packages/ansible/parsing/yaml/loader.py", line , in <module>
from ansible.parsing.yaml.constructor import AnsibleConstructor
File "/usr/lib/python2.7/site-packages/ansible/parsing/yaml/constructor.py", line , in <module>
from ansible.parsing.vault import VaultLib
File "/usr/lib/python2.7/site-packages/ansible/parsing/vault/__init__.py", line , in <module>
from cryptography.hazmat.backends import default_backend
File "/usr/lib64/python2.7/site-packages/cryptography/hazmat/backends/__init__.py", line , in <module>
import pkg_resources
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line , in <module>
parse_requirements(__requires__), Environment()
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line , in resolve
raise VersionConflict(dist,req) # XXX put more info here
VersionConflict: (cryptography 0.8. (/usr/lib64/python2./site-packages), Requirement.parse('cryptography>=1.1'))
2 分析报错原因：
最后一句Requirement.parse('cryptography>=1.1'))，得知cryptography的版本过低，需要升级，安装cryptography需要通过pip安装，所以需要先安装pip。
3 pip安装
下载：wget https://files.pythonhosted.org/packages/69/81/52b68d0a4de760a2f1979b0931ba7889202f302072cc7a0d614211bc7579/pip-18.0.tar.gz
解压：tar -zxvf pip-18.0.tar.gz
进入目录：cd pip-18.0
安装：python setup.py install
4 安装wheel
下载：wget https://files.pythonhosted.org/packages/2a/fb/aefe5d5dbc3f4fe1e815bcdb05cbaab19744d201bbc9b59cfa06ec7fc789/wheel-0.31.1.tar.gz
解压：tar -zxvf wheel-0.31..tar.gz
进入目录：cd wheel-0.31./
安装：python setup.py install
5 安装cryptography
下载：wget https://files.pythonhosted.org/packages/87/e6/915a482dbfef98bbdce6be1e31825f591fc67038d4ee09864c1d2c3db371/cryptography-2.3.1-cp27-cp27mu-manylinux1_x86_64.whl
安装：pip install cryptography-2.3.-cp27-cp27mu-manylinux1_x86_64.whl
6. 测试是否还有问题
[root@]# ansible --version
ansible 2.6.
config file = /etc/ansible/ansible.cfg
configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
ansible python module location = /usr/lib/python2./site-packages/ansible
executable location = /usr/bin/ansible
python version = 2.7. (default, Nov , ::) [GCC 4.8. (Red Hat 4.8.-)]
Aasible中cryptography兼容性报错解决办法的相关教程结束。
