What do do when Yum hangs or freezes

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1) Check for any processes holding the rpm database open using command

lsof | grep /var/lib/rpm

If this gives any output, kill all processes using kill -9 PID

2) Delete temporary DB files

rm -f /var/lib/rpm/__*

3) Next is to rebuild RPM database

rpm --rebuilddb -v -v

This usually does the trick.

Other causes may be yum repositories /etc/yum.repos.d/*.repo that are not accessible from your server. iptables rules which prevents you from connecting to yum repositories may be another cause.