Uyuni (https://uyuni-project.org), SUSE fork of Spacewalk and Upstream of SUSE Manager. But CentOS 6 will be a problem because it's EOL. I suggest to setup Uyuni, attach all Systems which are not yet EOL and take care about the EOL Systems via Ansible or whatever else you prefer and as soon they are running an up to date OS attach them to Uyuni as well. Source: almost 2 years ago
Do you know an article comparing Uyuni to other products?
Suggest a link to a post with product alternatives.
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