Centos7升级后，运行yum update 结果如下 ：
]# yum update
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
No module named pycurl
Please install a package which provides this module, or
verify that the module is installed correctly.
It‘s possible that the above module doesn‘t match the
current version of Python, which is:
2.7.5 (default, May 3 2017, 07:55:04)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-14)]
If you cannot solve this problem yourself, please go to
the yum faq at:
http://yum.baseurl.org/wiki/Faq
安装pycurl：
pip install pycurl
Collecting pycurl
Using cached pycurl-7.43.0.1.tar.gz
Installing collected packages: pycurl
Running setup.py install for pycurl ... done
Successfully installed pycurl-7.43.0.1
测试升级,运行yum update
]# yum updae
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
pycurl: libcurl link-time ssl backend (nss) is different from compile-time ssl backend (none/other)
Please install a package which provides this module, or
verify that the module is installed correctly.
It‘s possible that the above module doesn‘t match the
current version of Python, which is:
2.7.5 (default, May 3 2017, 07:55:04)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-14)]
If you cannot solve this problem yourself, please go to
the yum faq at:
http://yum.baseurl.org/wiki/Faq
网上找了好多资料，没有一个合适，检查另外一个相同配置的电脑，发现pycurl的版本是7.19.0 。卸载pycurl7.43.0，pip uninstall pycurl.重新安装指定的版本：pip install pycurl==7.19.0
]# pip install pycurl==7.19.0
Collecting pycurl==7.19.0
Using cached pycurl-7.19.0.tar.gz
Installing collected packages: pycurl
Running setup.py install for pycurl ... done
Successfully installed pycurl-7.19.0
测试升级,运行yum update
]# yum update -y
Loaded plugins: amazon-id, fastestmirror, rhui-lb, search-disabled-repos
Loading mirror speeds from cached hostfile
- city-fan.org: www.city-fan.org
- epel: ny-mirrors.evowise.com
- rhui-REGION-client-config-server-7: rhui2-cds02.us-east-1.aws.ce.redhat.com
- rhui-REGION-rhel-server-releases: rhui2-cds02.us-east-1.aws.ce.redhat.com
- rhui-REGION-rhel-server-rh-common: rhui2-cds02.us-east-1.aws.ce.redhat.com
No packages marked for update
成功执行命令。
后记，开始安装pycurl的时候，只能手动去安装。由于是云主机，直接下载相同版本的iso镜像文件（3分钟下载5G左右的文件），挂载并拷贝2个rpm文件到本地系统。libcurl-7.29.0-42.el7.x86_64.rpm , libcurl-devel-7.29.0-42.el7.x86_64.rpm
由于包依赖，单独安装失败，进入到rpm所在文件夹，运行命令安装，rpm -Uvh *.rpm --nodeps --force
原文地址：http://blog.51cto.com/10108149/2062449