I want to update glibc according to RedHat: https://rhn.redhat.com/errata/RHSA-2015-0090.html
Is it required restart a server after the glibc upgrade?
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A restart is not technically required, because only programs which use glibc need to be restarted, and the kernel does not use glibc.
That being said, restarting everything that uses glibc is sufficiently broad that you might as well just reboot.
/sbin/init uses glibc. However restarting it is trivial (run
init u as root).