Is best done manually: 1sudo yum -y update --security 1The problem is that CentOS does not supply the necessary metadata in its yum repositories such that yum-plugin-security can function. In other words, yum-plugin-security does nothing, and the automation of security updates is a lost cause in CentOS. In fact, the …

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https://help.ubuntu.com/community/AutomaticSecurityUpdates http://packages.ubuntu.com/search?keywords=unattended-upgrades

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