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Should you run automatic updates

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http://unix.stackexchange.com – I'm running production Centos web servers. I want to know what is best practice for running updates. Should I automate this with yum-cron or yum-updatesd? Or is there a danger of updates breaking sites so it would be better to update on a test server and then run updates manually weekly? The majority of the servers are using only the official repositories but some have the atomic repository for PHP modules that are not available otherwise. What's best in this case? can I set yum to only use Atomic for the PHP modules ? I don't want everything updating to the bleeding edge stuff in Atomic, I w (HowTos)