The output message says to contact Cisco support for this issue. The zlib lib repositories do now have zlib-126.96.36.199. In a search through zlib - this one is not found. Below is the output message.
[lwarring@sv-usplan-cnso06 nso-6.0]$ sudo ./nso-6.0.linux.x86_64.installer.bin --local-install localinstall/
INFO Using temporary directory /tmp/ncs_installer.30099 to stage NCS installation bundle
INFO Unpacked ncs-6.0 in /opt/nso/nso-6.0/localinstall/
INFO Found and unpacked corresponding DOCUMENTATION_PACKAGE
INFO Found and unpacked corresponding EXAMPLE_PACKAGE
INFO Found and unpacked corresponding JAVA_PACKAGE
INFO Generating default SSH hostkey (this may take some time)
INFO SSH hostkey generated
INFO Generating self-signed certificates for HTTPS
REQUIRED LIBRARIES NOT FOUND
/opt/nso/nso-6.0/localinstall//lib/ncs/erts/bin/ncs.smp: /lib64/libz.so.1: version `ZLIB_188.8.131.52' not found (required by /opt/nso/nso-6.0/localinstall//lib/ncs/erts/bin/ncs.smp)
You will need to install them before you will be able to run NSO.
You are welcome to ask your Cisco support contact for assistance.
INFO Environment set-up generated in /opt/nso/nso-6.0/localinstall//ncsrc
INFO NSO installation script finished
INFO Found and unpacked corresponding NETSIM_PACKAGE
INFO NCS installation complete
Go to the NSO developer hub and submit your question there. https://community.cisco.com/t5/developer-networking/ct-p/j-developer-networking
I think NSO is saying it is time to move to something newer than CentOS 7.9. Or CentOS altogether, may it RIP
If you want to make NSO 6 run on Centos 7, you need to download the zlib source code and "make install" it replacing the old version that comes with Centos 7.
The zlib homepage. zlib.net, is gone, so you need to Google for something like "zlib 1.2.13" to get the source code tarball from somewhere.
Try following this guide https://www.codetd.com/en/article/10787113 but use the 1.2.13 version from for example https://github.com/madler/zlib/releases/tag/v1.2.13
If the web server with the example guide is down, try: https://webcache.googleusercontent.com/search?q=cache:Y9Sxo72pk4IJ:https://www.codetd.com/en/article/10787113&cd=10&hl=sv&ct=clnk&gl=se
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