To exclude packages permanently edit the yum.conf file:

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vim /etc/yum.conf
Add “exclude=package*” E.g:
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[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exclude=php* kernel* 



Temporary Solution:
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yum update --exclude=PACKAGENAME*