升级openssl导致yum不可用

# yum
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   /usr/lib64/python2.7/site-packages/pycurl.so: undefined symbol: CRYPTO_num_locks

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  1 2020, 22:27:31) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]

If you cannot solve this problem yourself, please go to 
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

最近升级了openssl后发现yum不可用了，排查下原因修复yum。这里提示了/usr/lib64/python2.7/site-packages/pycurl.so: undefined symbol: CRYPTO_num_locks

检查ld.so.conf

# cat /etc/ld.so.conf
include ld.so.conf.d/*.conf

没有引入其它lib库目录，没有问题，如果这里有其它的lib库目录，删除后需要使用ldconfig更新一下cache

使用ldconfig

# ldconfig -p | grep libcurl
        libcurl.so.4 (libc6,x86-64) => /lib/libcurl.so.4
        libcurl.so (libc6,x86-64) => /lib/libcurl.so

这里libcurl库的版本一致，没有问题，如果这里版本不一致，删除低版本的so

使用ldd

# ldd /usr/lib64/python2.7/site-packages/pycurl.so
        linux-vdso.so.1 =>  (0x00007ffd633f5000)
        /$LIB/libonion.so => /lib64/libonion.so (0x00007f21e2b18000)
        libcrypto.so.1.1 => /lib/libcrypto.so.1.1 (0x00007f21e22f6000)
        libssl.so.1.1 => /lib64/libssl.so.1.1 (0x00007f21e2063000)
        libcurl.so.4 => /lib/libcurl.so.4 (0x00007f21e1de2000)
        libpython2.7.so.1.0 => /lib64/libpython2.7.so.1.0 (0x00007f21e1a16000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f21e17fa000)
        libc.so.6 => /lib64/libc.so.6 (0x00007f21e142b000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007f21e1227000)
        libz.so.1 => /lib64/libz.so.1 (0x00007f21e1011000)
        libutil.so.1 => /lib64/libutil.so.1 (0x00007f21e0e0e000)
        libm.so.6 => /lib64/libm.so.6 (0x00007f21e0b0c000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f21e29ff000)

这里pycurl.so依赖的动态库也都有，没有问题，如果找不到动态库需要补全

重新构建pycurl

# wget https://pypi.python.org/packages/source/p/pycurl/pycurl-7.43.0.3.tar.gz
# tar -zxvf pycurl-7.43.0.3.tar.gz
# which curl-config
/usr/bin/curl-config
# python setup.py install --curl-config=/usr/bin/curl-config

后来想到升级了openssl，但是pycurl并没有重新构建，于是重新构建就好了