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Whilst updating nodejs and npm on a Centos 6 or 7 server running Apache, I hit a few walls and as a matter of process found some commands that are handy to run before doing a deep dive in Google.

 

Cleaning the cache

sudo yum clean all
rm -rf /var/cache/yum/*

To make the cache

sudo yum clean all; sudo yum makecache

If you want to run several commands use semi-colon as noted above.

 

Updating

When running an update command run

sudo yum -y update