You probably experienced the following issue, running “Yum update” on a RHEL 7.3 system :
error: Failed to initialize NSS library
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
cannot import name ts
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, Aug 2 2016, 04:20:16)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)]
If you cannot solve this problem yourself, please go to
the yum faq at:
Apparently, some component updated are “out of sync” in term of version with existing, non-updated components of the system.
To resolve this issue, you need to invoke yum with “libnspr4” shared object, upgrading nspr.
1. Download libnspr4 shared object :
Alternate link (subscription required) : https://access.redhat.com/node/3134931/40/0
2. Unpack it :
tar -jxvf libnspr4.so_.tar.bz2
3. Invoke Yum with it :
LD_PRELOAD=./libnspr4.so yum update nspr
Yum should be working now.